Patent Description:
Detailed knowledge of machinery operation for control and/or health monitoring of a vehicle typically requires sensing systems capable of obtaining information from locations that are sometimes difficult to access due to moving parts, internal operating environment and/or machine configuration. The access limitations make wire routing bulky, expensive and vulnerable to interconnect failures. The sensor and interconnect operating environments for desired sensor locations often exceed the capability of the interconnect systems. In some cases, cable cost, volume and weight exceed the desired limits for practical applications.

Application of electromagnetic sensor and effector technologies to address the wiring constraints faces the challenge of providing reliable communications in a potentially unknown environment with potential interference from internal or external sources. Large-scale deployments of multiple sensors and/or effectors with varying signal path lengths further increases the challenges of normal operation and fault detection in a network of connected nodes. High temperature environments further constrain sensor system components.

<CIT> discloses a communication device wherein electromagnetic waves are propagated along waveguides independently of electrical potential. <CIT> discloses a surgical instrument incorporating an ultrasonic transmission waveguide.

According to a first aspect, there is provided a radio frequency waveguide communication system according to claim <NUM>.

In one embodiment, a radio frequency waveguide communication system includes a controller configured to output a radio frequency signal, and at least one sensor configured to output a sensor signal indicative of monitored parameter of a machine. The radio frequency waveguide communication system includes a waveguide and a radio frequency interface module. The waveguide is in signal communication with the controller and is configured to guide the radio frequency signal toward the at least one sensor. The radio frequency interface module is configured to establish signal communication between the controller and the at least one sensor, and includes at least one detachable portion configured to detach from the at least one waveguide. The radio frequency interface module is configured to generate a data signal based on the radio frequency signal and to deliver the data signal to the at least one sensor. The radio frequency interface module comprises a smart node configured to generate the data signal, and a radio frequency adapter includes the at least one detachable portion. The smart node comprises at least one antenna, and a transceiver processor configured to convert the radio frequency signal into a data signal compatible with the at least one sensor and to convert the sensor signal into a radio frequency signal. The at least one antenna and the transceiver processor are formed on a printed circuit board disposed within the conduit of the at least one waveguide.

Optionally, the radio frequency interface module is configured to convert the sensor signal into a radio frequency signal and deliver the converted radio frequency signal to the controller.

Optionally, the radio frequency adapter comprises an adapter housing configured to support a wiring network including one or more lead wires, a sub-flange configured to couple the adapter housing to the distal end of the conduit, and an interface sensor node including an adapter end configured to establish connection to the adapter housing and a node end configured to establish connection to the at least one sensor.

Optionally, the interface sensor node includes at least one wire lead pathway configured to convey a lead wire from the adapter end to the node end.

Optionally, the at least one lead wire includes a first wire end in signal communication with the transceiver and an opposing second end in signal communication with the at least one node.

Optionally, the second end is connected to an intermediate connector interposed between the radio frequency adapter and the at least one node.

Optionally, the intermediate connector includes a first connector end that establishes signal communication with the node interface and an opposing second connector end that establishes signal communication with the at least one node.

Optionally, the interface node, the adapter housing, and the sub-flange are fabricated as a single integral component such that the radio frequency adapter is configured to detach completely from the at least one waveguide.

Optionally, the interface node, the adapter housing, and the sub-flange are separate individual components, and wherein the interface node is configured to detach from the adapter housing.

A technical effect of the of the present teachings described herein is achieved by providing an RF interface module that dynamically establishes an interchangeable communication interface between an RF-based controller and one or more nodes (e.g. sensors) included in a connected node of an RF waveguide communication system.

Application of electromagnetic sensor and effector technologies to address the wiring constraints faces the challenge of providing reliable communications in a potentially unknown environment with potential interference from internal or external sources. RF waveguide communications and power systems employed in gas turbine engine systems, for example, can offer higher bandwidth, reduced weight, smaller footprint, and greater reliability. However, a wide range of nodes (e.g., sensors, actuators, effectors, etc.) may have been designed, qualified and implemented for on-engine use which are not configured with a waveguide interface.

At least one or more non-limiting embodiments described herein provide an RF interface module configured to adapt one or more nodes with a RF waveguide communications and power system. In one or more non-limiting embodiments, the nodes can include both passive nodes and active nodes using, for example, a bayonet type connector interface. The RF interface module includes a smart node and an RF adapter. The smart node is configured to convert an RF signal into a digital or analog system compatible with a protocol for which the node is designed to communicate over, and to convert the output node signal (e.g., a digital signal or analog signal) into an RF signal. The RF adapter is configured to relay the converted signals to and from the nodes. The RF adapter includes a detachable portion that can be interchanged with different connector interfaces that mate or are compatible with various nodes such that an RF signal information can be properly communicated to various types of nodes. In this manner, the need to redesign and requalify an entire node suite used on a given platform may be avoided.

Various embodiments of the present disclosure are related to electromagnetic communication through and to components of a machine. <FIG> schematically illustrates a gas turbine engine <NUM> as one example of a machine as further described herein. The gas turbine engine <NUM> is depicted as a two-spool turbofan that generally incorporates a fan section <NUM>, a compressor section <NUM>, a combustor section <NUM> and a turbine section <NUM>. The fan section <NUM> drives air along a bypass flow path B in a bypass duct to provide a majority of the thrust, while the compressor section <NUM> drives air along a core flow path C for compression and communication into the combustor section <NUM> then expansion through the turbine section <NUM>. Although depicted as a two-spool turbofan gas turbine engine in the disclosed non-limiting embodiment, it should be understood that the concepts described herein are not limited to use with two-spool turbofans as the teachings may be applied to other types of turbine engines including three-spool architectures or any other machine that requires nodes (e.g., sensors, actuators, effectors, etc.) to operate with similar environmental challenges or constraints. Additionally, the concepts described herein may be applied to any machine or system comprised of control and / or health monitoring systems. Examples can include various moderate to high temperature environments, such as glass and metal forming systems, petroleum-oil-and-gas (POG) systems, ground-based turbine for energy generation, nuclear power systems, and transportation systems.

With continued reference to <FIG>, the exemplary engine <NUM> generally includes a low speed spool <NUM> and a high-speed spool <NUM> mounted for rotation about an engine central longitudinal axis A relative to an engine static structure <NUM> via several bearing systems <NUM>.

The high-speed spool <NUM> includes an outer shaft <NUM> that interconnects a second (or high) pressure compressor <NUM> and a second (or high) pressure turbine <NUM>. A combustor <NUM> is arranged in exemplary gas turbine engine <NUM> between the high-pressure compressor <NUM> and the high-pressure turbine <NUM>. A mid-turbine frame <NUM> of the engine static structure <NUM> is arranged generally between the high-pressure turbine <NUM> and the low-pressure turbine <NUM>.

The core airflow is compressed by the low-pressure compressor <NUM> then the high-pressure compressor <NUM>, mixed and burned with fuel in the combustor <NUM>, then expanded over the high-pressure turbine <NUM> and low-pressure turbine <NUM>. The turbines <NUM>, <NUM> rotationally drive the respective low speed spool <NUM> and high-speed spool <NUM> in response to the expansion. In direct drive configurations, the gear system <NUM> can be omitted.

Low pressure turbine <NUM> pressure ratio is pressure measured prior to inlet of low-pressure turbine <NUM> as related to the pressure at the outlet of the low-pressure turbine <NUM> prior to an exhaust nozzle. A significant amount of thrust can be provided by the bypass flow B due to the high bypass ratio. The example low pressure turbine <NUM> can provide the driving power to rotate the fan section <NUM> and therefore the relationship between the number of turbine rotors <NUM> in the low-pressure turbine <NUM> and the number of blades in the fan section <NUM> can establish increased power transfer efficiency.

The disclosed example gas turbine engine <NUM> includes a control and health monitoring system <NUM> (generally referred to as system <NUM>) utilized to monitor component performance and function. The system <NUM> includes a network <NUM>, which is an example of a guided electromagnetic transmission network. The network <NUM> includes a controller <NUM> operable to communicate with connected nodes 68a, 68b through electromagnetic signals. The nodes 68a, 68b can be distributed throughout the gas turbine engine <NUM> or other such machine. Node 68a is an example of an effector node that can drive one or more effectors/actuators of the gas turbine engine <NUM>. Node 68b is an example of a sensor node that can interface with one or more sensors of the gas turbine engine <NUM>. Nodes 68a, 68b can include processing support circuitry to transmit/receive electromagnetic signals between sensors or effectors and the controller <NUM>. A coupler <NUM> can be configured as a splitter between a waveguide <NUM> coupled to the controller <NUM> and waveguides <NUM> and <NUM> configured to establish guided electromagnetic transmission communication with nodes 68a and 68b respectively. The coupler <NUM> can be a simple splitter or may include a repeater function to condition electromagnetic signals sent between the controller <NUM> and nodes 68a, 68b. In the example of <FIG>, a radio frequency-based repeater <NUM> is interposed between the coupler <NUM> and node 68b, where waveguide <NUM> is a first waveguide coupled to the coupler <NUM> and radio frequency-based repeater <NUM>, and waveguide <NUM> is a second waveguide coupled to the radio frequency-based repeater <NUM> and node 68b. Collectively, waveguides <NUM>, <NUM>, <NUM>, <NUM> are configured to guide transmission of the electromagnetic signals between the controller <NUM> and one or more of the nodes 68a, 68b. The transmission media within waveguides <NUM>-<NUM> may include dielectric or gaseous material. In embodiments, the waveguides <NUM>-<NUM> can be hollow metal tubes. The disclosed system <NUM> may be utilized to control and/or monitor any component function or characteristic of a turbomachine, aircraft component operation, and/or other machines.

Prior control & diagnostic system architectures utilized in various applications include centralized system architecture in which the processing functions reside in an electronic control module. Redundancy to accommodate failures and continue system operation systems can be provided with dual channels with functionality replicated in both control channels. Actuator and sensor communication are accomplished through analog wiring for power, command, position feedback, sensor excitation and sensor signals. Cables and connections include shielding to minimize effects caused by electromagnetic interference (EMI). The use of analog wiring and the required connections limits application and capability of such systems due to the ability to locate wires, connectors and electronics in small and harsh environments that experience extremes in temperature, pressure, and/or vibration. Exemplary embodiments can use radio frequencies guided by the waveguides <NUM>-<NUM> in a guided electromagnetic transmission architecture to provide both electromagnetic signals and power to the individual elements of the network <NUM>.

The use of electromagnetic radiation in the form of radio waves (e.g., ranging from MHz to GHz) to communicate and power the sensors and effectors using a traditionally complex wired system provides substantial architectural simplification, especially as it pertains to size, weight, and power (SWaP). Embodiments provide extension of a network where reduced SNR would compromise network performance by trading off data rates for an expansion of the number of nodes and distribution lines; thereby enabling more nodes / sensors, with greater interconnectivity.

Referring to <FIG>, a guided electromagnetic transmission network <NUM> is depicted as an example expansion of the network <NUM> of <FIG>. The guided electromagnetic transmission network <NUM> can include the controller <NUM> coupled to coupler <NUM> through waveguide <NUM>. The coupler <NUM> is further coupled to coupler 67a through waveguide <NUM> and to coupler 67b through waveguide <NUM>. Couper 67a is further coupled to three nodes 68a through waveguides 173a, 173b, 173c in parallel. Each of the nodes 68a can interface or be combined with multiple effectors <NUM>. Coupler 67b is also coupled to two nodes 68b through waveguides 174a, 174b in parallel. Each of the nodes 68b can interface or be combined with multiple sensors <NUM>. Although the example of <FIG> depicts connections to effectors <NUM> and sensors <NUM> isolated to different branches, it will be understood that effectors <NUM> and sensors <NUM> can be interspersed with each other and need not be isolated on dedicated branches of the guided electromagnetic transmission network <NUM>. Couplers <NUM>, 67a, 67b can be splitters and/or can incorporate instances of the radio frequency-based repeater <NUM> of <FIG>. Further, one or more instances of the radio frequency-based repeater <NUM> can be installed at any of the waveguides <NUM>, <NUM>, <NUM>, 173a-c, and/or 174a-b depending on the signal requirements of the guided electromagnetic transmission network <NUM>.

Nodes 68a, 68b can be associated with particular engine components, actuators or any other machine part from which information and communication is performed for monitoring and/or control purposes. The nodes 68a, 68b may contain a single or multiple electronic circuits or sensors configured to communicate over the guided electromagnetic transmission network <NUM>.

The controller <NUM> can send and receive power and data to and from the nodes 68a, 68b. The controller <NUM> may be located on equipment near other system components or located remotely as desired to meet application requirements.

A transmission path (TP) between the controller <NUM> and nodes 68a, 68b can be used to send and receive data routed through the controller <NUM> from a control module or other components. The TP may utilize electrical wire, optic fiber, waveguide or any other electromagnetic communication including radio frequency/microwave electromagnetic energy, visible or non-visible light. The interface between the controller <NUM> and nodes 68a, 68b can transmit power and signals.

The example nodes 68a, 68b may include radio-frequency identification (RFID) devices along with processing, memory and/or the interfaces to connect to conventional sensors, actuators, or effectors, such as solenoids or electro-hydraulic servo valves. The waveguides <NUM>, <NUM>, <NUM>, 173a-c, and/or 174a-b can be shielded paths that support electromagnetic communication, including, for instance, radio frequency, microwaves, magnetic or optic waveguide transmission. Shielding can be provided such that electromagnetic energy or light interference <NUM> with electromagnetic signals <NUM> (shown schematically as arrows) are mitigated in the guided electromagnetic transmission network <NUM>. Moreover, the shielding provides that the electromagnetic signals <NUM> are less likely to propagate into the environment outside the guided electromagnetic transmission network <NUM> and provide unauthorized access to information. In some embodiments, guided electromagnetic radiation is in the range <NUM>-<NUM>. Electromagnetic radiation can be more tightly arranged around specific carrier frequencies, such as <NUM>-<NUM>, <NUM>, <NUM>, or <NUM>-<NUM> as examples in the microwave spectrum. A carrier frequency can transmit electric power, as well as communicate information, to multiple nodes 68a, 68b using various modulation and signaling techniques.

The nodes 68a with effectors <NUM> may include control devices, such as a solenoid, switch or other physical actuation devices. RFID, electromagnetic or optical devices implemented as the nodes 68b with sensors <NUM> can provide information indicative of a physical parameter, such as pressure, temperature, speed, proximity, vibration, identification, and/or other parameters used for identifying, monitoring or controlling component operation. Signals communicated in the guided electromagnetic transmission network <NUM> may employ techniques such as checksums, hash algorithms, error control algorithms and/or encryption to mitigate cyber security threats and interference.

The shielding in the guided electromagnetic transmission network <NUM> can be provided such that power and communication signals are shielded from outside interference, which may be caused by environmental electromagnetic or optic interference. Moreover, the shielding limits intentional interference <NUM> with communication at each component. Intentional interference <NUM> may take the form of unauthorized data capture, data insertion, general disruption and/or any other action that degrades system communication. Environmental sources of interference <NUM> may originate from noise generated from proximate electrical systems in other components or machinery along with electrostatic and magnetic fields, and/or any broadcast signals from transmitters or receivers. Additionally, environmental phenomena, such as cosmic radio frequency radiation, lightning or other atmospheric effects, could interfere with local electromagnetic communications.

It should be appreciated that while the system <NUM> is explained by way of example with regard to a gas turbine engine <NUM>, other machines and machine designs can be modified to incorporate built-in shielding for monitored or controlled components in a guided electromagnetic transmission network. For example, the system <NUM> can be incorporated in a variety of harsh environment machines, such as an elevator system, heating, ventilation, and air conditioning (HVAC) systems, manufacturing and processing equipment, a vehicle system, an environmental control system, and all the like. As a further example, the system <NUM> can be incorporated in an aerospace system, such as an aircraft, rotorcraft, spacecraft, satellite, or the like. The disclosed system <NUM> includes the network <NUM>, <NUM> that provides consistent communication with electromagnetic devices, such as the example nodes 68a, 68b, and removes variables encountered with electromagnetic communications such as distance between transmitters and receiving devices, physical geometry in the field of transmission, control over transmission media such as air or fluids, control over air or fluid contamination through the use of filtering or isolation and knowledge of temperature and pressure.

The system <NUM> provides for a reduction in cable and interconnecting systems to reduce cost and increases reliability by reducing the number of physical interconnections. Reductions in cable and connecting systems further provides for a reduction in weight while enabling additional redundancy without significantly increasing cost. Moreover, additional nodes can be added without the need for additional wiring and connections that provide for increased system accuracy and response. Finally, the embodiments may provide a "plug-n-play" approach to add a new node, potentially without a requalification of the entire system but only the new component; thereby greatly reducing qualification costs and time.

Turning now to <FIG>, an RF waveguide communication system <NUM> is illustrated according to a non-limiting embodiment. The RF waveguide communication system <NUM> includes one or more connected nodes 68b (e.g., sensors), a controller <NUM>, a waveguide <NUM>, and an RF interface module <NUM>. Although a single connected node 68b and single waveguide <NUM> are shown, it should be appreciated that additional nodes 68b and/or waveguides <NUM> can be employed in the RF waveguide communication system <NUM> without departing from the scope of the invention. Going forward, the node 68b will be described as a sensor node 68b. It should be appreciated that other types of nodes such as actuators and/or effectors, for example, can be employed without departing from the scope of the invention.

The sensor node 68b can include various digital or analog sensors configured to monitor the machine and output one or more sensor signals indicative of the monitored state or measured parameters (e.g., speed, temperature, pressure, frequency, power, voltage, current, etc.) of a machine (e.g., gas turbine engine).

The controller <NUM> is configured to output an electromagnetic signal such as, for example, an RF signal. The RF signal has a frequency ranging, for example, from about <NUM> gigahertz (GHz) to about <NUM>. The controller <NUM> can be constructed as an electronic hardware controller that includes memory and a processor configured to execute algorithms and computer-readable program instructions stored in the memory. In one or more non-limiting embodiments, the controller <NUM> is a full authority digital engine controller (FADEC) configured to control one or more processes of the machine and perform one or more signal processing operations and data analysis operations based, at least in part, on the sensor signal output from the sensor node 68b.

The waveguide <NUM> includes a hollow conduit <NUM> that serves as an RF channel configured to guide the transmission of the RF signal toward the sensor 68b. The conduit <NUM> includes a proximate end <NUM> coupled to the controller <NUM> and a distal end <NUM> coupled to the RF interface module <NUM>. The conduit <NUM> extends from the proximate end <NUM> to the distal end <NUM> to define a channel length.

The RF interface module <NUM> is interposed between the waveguide <NUM> and the sensor node 68b. Accordingly, the RF interface module <NUM> is configured to convert the RF signal generated by the controller <NUM> into a data signal, and convert the sensor signal output from the sensor node 68b into an RF signal as described in greater detail below. The data signal includes a digital signal and/or an analog signal depending on the type of sensor node 68b, e.g., whether the sensor node 68b includes a digital sensor or an analog sensor. In this manner, the RF interface <NUM> can establish electrical communication between the controller <NUM> and the sensor 68b, even when the sensor 68b operates according to digital or analog protocols but is not designed to directly operate according to RF signals.

In one or more non-limiting embodiments, the RF waveguide communication system <NUM> can employ an intermediate connector <NUM> to establish a wired connection between the sensor node 68b and the RF interface module <NUM>. The intermediate connector <NUM> can include a first connector end <NUM> that establishes signal communication with the RF interface module <NUM> and an opposing second connector end <NUM> that establishes signal communication with the sensor node 68b.

Referring collectively to <FIG>, <FIG> and <FIG>, the RF interface module <NUM> is illustrated according to a non-limiting embodiment. The RF interface <NUM> includes a smart node <NUM> and an RF adapter <NUM>. The smart node <NUM> is configured to facilitate compatibility between a digital or analog data protocol of a sensor included in the sensor node 68b and the RF data protocol of the controller <NUM>.

The smart node <NUM> includes one or more antennas <NUM> and a transceiver processor <NUM> (see <FIG>). The antenna <NUM> is configured to transmit and receive a RF signal to and from the smart node <NUM>. The transceiver processor <NUM> is configured to convert the RF signal into a data signal (e.g., a digital signal or analog signal) that is compatible with a sensor included in the sensor node 68b. Similarly, the transceiver processor <NUM> is also configured to convert the output sensor signal (e.g., a digital or analog output signal) into an RF signal.

In one or more non-limiting embodiments, the antenna <NUM> and transceiver processor <NUM> are formed on a surface of a printed circuit board (PCB) that is supported by a PCB bracket <NUM>. The PCB bracket <NUM> can be coupled to the waveguide <NUM> such that the transceiver processor <NUM> and/or the antenna <NUM> are disposed within the waveguide conduit <NUM>. In a non-limiting embodiment of the disclosure, opposing slots are formed in sidewalls that extend vertically between a lower surface and upper surface of the waveguide conduit <NUM>. The slots can receive the PCB bracket <NUM> such that the surface of the PCB board and the PCB bracket <NUM> are parallel with the lower and upper surfaces of the waveguide conduit <NUM>.

The RF signals can be exchanged between the smart node <NUM> and the controller <NUM>. For example, the controller <NUM> is capable of selecting one or more of the sensor nodes (e.g., sensor node 68b) included in the system <NUM> for interrogation and can command the smart node <NUM> to transmit one or more interrogation frequencies associated to a selected sensor node 68b. Sensor interrogation includes, for example, a process to determine whether a node (e.g., sensor node 68b) is working properly by sending a signal through the node and monitoring the response. The response can indicate whether the node (e.g., sensor, actuator, effector, etc.) is cracked, broken, clogged, seized, or otherwise not operating properly The interrogation frequencies can be pure tones that provoke a resonance response in an associated sensor node 68b which returns one or more sensor frequencies indicative of one or more sensed values. A sensor included in the sensor node 68b can be identified by the frequency closeness of a tone to a designated resonant frequency. In this way, multiple sensors can be simultaneously interrogated and analyzed.

The RF adapter <NUM> includes an adapter housing <NUM>, a sub-flange <NUM>, and an interface sensor node <NUM>. The adapter housing <NUM>, sub-flange <NUM>, and interface sensor node <NUM> can be from a rigid material including, but not limited to, metal, or a high-temperature resistant polymer. In some non-limiting embodiments, the adapter housing <NUM>, sub-flange <NUM>, and interface sensor node <NUM> are fabricated as a single integral component using, for example, additive manufacturing techniques (e.g., three-dimensional printing). In other non-limiting embodiments, the adapter housing <NUM>, sub-flange <NUM>, and interface sensor node <NUM> are implemented as separate individual components. In any case the RF adapter <NUM> includes at least one detachable portion, which allows the RF adapter <NUM> to provide a dynamically interchangeable signal communication interface between the controller <NUM> and the sensor node 68b as discussed in greater detail below.

The adapter housing <NUM> is configured to support a wiring network <NUM> including one or more lead wires. The sub-flange <NUM> includes a first side that couples to the adapter housing <NUM> and an opposing second side that couples to the distal end <NUM> of the waveguide conduit <NUM>. In one or more non-limiting embodiments, the sub-flange <NUM> can be connected and disconnected from the waveguide conduit <NUM>. In this manner, the entire adapter housing <NUM> can be interchanged with a different adapter housing having a different pin arrangement) by interchanging the sub-flange <NUM>. The sub-flange <NUM> can also include one or more O-ring seal grooves <NUM>, which seal the internal adapter housing <NUM> from external environmental conditions such as moisture, dust, etc..

The interface sensor node <NUM> including an adapter end and a sensor end. The adapter end is configured to establish a connection to the adapter housing <NUM>, while the sensor end is configured to establish a connection to the sensor node 68b. In one or more non-limiting embodiments, the interface sensor node <NUM> includes one or more wire lead pathways <NUM> (see <FIG>). The wire lead pathways <NUM> are configured to convey (e.g., pass through) a lead wire from the adapter end to the sensor end. For example, a lead wire can include a first wire end connected to the smart node <NUM> (e.g., the transceiver processor <NUM>) and an opposing second wire end connected to the sensor node 68b or some cases the intermediate connector <NUM> (see <FIG> and <FIG>).

The interface sensor node <NUM> can include a variety of connector interfaces including, but not limited to, a universal serial bus (USB) connector interface, a fiber optic connector interface, a co-axial cable connector interface, a bayonet connector, or various known U. military standard electrical connector interfaces (e.g., a MIL-DTL-<NUM> connector interface, a MIL-DTL-<NUM> connector interface, etc.). In one or more non-limiting embodiments, the interface sensor node <NUM> can be coupled to the adapter housing <NUM> in a manner that allows the interface sensor node <NUM> to be interchanged, e.g., detached and replaced. For instance, the interface sensor node <NUM> can be clipped, snapped, screwed, etc., to the adapter housing <NUM>, thereby allowing it to be detached and replaced, either with the same type of interface sensor node <NUM> (in cases where it is damaged or contains a fault) or with a completely different type of interface sensor node <NUM> that is compatible or mate with a different sensor added to one or more of the sensor node 68b. In this manner, the interface sensor node <NUM> can be readily interchanged to provide different interfaces for different types of sensors included in the sensor node 68b. In cases where the adapter housing <NUM>, sub-flange <NUM>, and interface sensor node <NUM> are integrated as a single component, the sub-flange <NUM> can be coupled to the waveguide conduit <NUM> (e.g., screwed, snapped, clipped, etc.) such that the entire RF adapter <NUM> can be detached from the waveguide conduit <NUM> and readily interchanged or replaced to match the compatibility of a sensor included in the sensor node 68b.

Claim 1:
A radio frequency waveguide communication system (<NUM>), comprising:
a controller (<NUM>) configured to communicate using a radio frequency signal;
at least one connected node (68b) configured to output a node signal indicative of monitored parameter of a machine;
at least one waveguide (<NUM>) operatively coupled between the controller and the connected node to guide the radio frequency signal; and
a radio frequency interface module (<NUM>) configured to receive the node signal and to communicate with the controller (<NUM>) using the radio frequency signal, the radio frequency interface module including at least one detachable portion configured to detach from the at least one waveguide,
wherein the radio frequency interface module (<NUM>) is configured to generate a data signal based on the radio frequency signal and to send the data signal to the at least one connected node (68b), the radio frequency interface module (<NUM>) comprising:
a node (<NUM>) configured to generate the data signal; and
a radio frequency adapter (<NUM>) including the at least one detachable portion,
wherein the node (<NUM>) configured to generate the data signal is a smart node comprising:
at least one antenna (<NUM>); and
a transceiver processor (<NUM>) configured to generate a data signal based on the radio frequency signal, the data signal being compatible with the at least one connected node (68b) and to generate a radio frequency signal based on the node signal;
wherein the at least one antenna (<NUM>) and the transceiver processor (<NUM>) are disposed on a printed circuit board disposed within a conduit (<NUM>) of the at least one waveguide (<NUM>).