Please select the most similar patent number from A, B, C and D. Which number is?
A MEMS gas sensor (A) and an array (B) thereof, and a gas detection and preparation method. The gas sensor (A) comprises a first substrate (A2) with a cavity (A1) provided in a first surface, and a gas detection assembly (A3) arranged at an opening of the cavity (A1), wherein the gas detection assembly (A3) comprises: a supporting suspension bridge (A31) erected on the opening of the cavity (A1), and a gas detection part (A32) arranged on the supporting suspension bridge (A31). The gas detection part (A32) comprises a strip-shaped heating electrode part (A321), an insulating layer (A322), a strip-shaped detection electrode part (A323) and a gas-sensitive material part (A324), which are sequentially stacked, wherein the strip-shaped detection electrode part (A323) comprises a first detection electrode part (A323-1) and a second detection electrode part (A323-2), with a first opening (A325) being provided between the first detection electrode part (A323-1) and the second detection electrode part (A323-2); and the gas-sensitive material part (A324) is arranged at the position of the first opening (A325), a first end of the gas-sensitive material part (A324) is connected to the first detection electrode part (A323-1), and a second end of the gas-sensitive material part (A324) is connected to the second detection electrode part (A323-2).
A: A test chip, a preparation method therefor and a method of use thereof, and a reaction system. The test chip (100) comprises a first substrate (10), a micro-cavity definition layer (11) and a heating electrode (12), wherein the micro-cavity definition layer (11) defines a plurality of micro reaction chambers (110); the heating electrode (12) is configured to release heat after being electrified; the heating electrode (12) comprises a first electrode portion (121) and at least one second electrode portion (122); and the orthographic projection of the plurality of micro reaction chambers (110) on the first substrate (10) is located within the orthographic projection of the first electrode portion (121) on the first substrate (10), the orthographic projection of the plurality of micro reaction chambers (110) on the first substrate (10) does not overlap the orthographic projection of the second electrode portion (122) on the first substrate (10), and the resistance value of the first electrode portion (121) is greater than the resistance value of the second electrode portion (122). The test chip (100) has a good temperature control effect and high temperature increasing and decreasing efficiency, and is compatible with a semiconductor production line, and the production cost is low.
B: A sensor apparatus, an electronic device, and a method for reducing signal noise. The sensor apparatus (10) comprises first detection regions (11) and a second detection region (12). Each first detection region (11) comprises at least one detection unit (A). The detection unit (A) comprises a first detection electrode (111) and a second detection electrode (112) opposite to each other, and a first insulation layer (113). The first detection electrode (111) is electrically insulated from the second detection electrode (112) by means of the first insulation layer (113). The second detection region (12) comprises at least one sensor unit (B). The sensor unit (B) comprises a first sensor electrode (121), a second sensor electrode (122), and a first light sensing layer (123). The first light sensing layer (123) is electrically connected to the first sensor electrode (121) and the second sensor electrode (122). The sensor apparatus, the electronic device, and the method for reducing signal noise can reduce the signal noise of signals to be detected, improve the signal-to-noise ratios, and avoid the use of a light shielding metal so as not to affect the display effect.
C: A gas sensor based on a field effect transistor, and a manufacturing method therefor. The gas sensor comprises a substrate (1), an insulating layer (2), an active layer (3), a source (4), and a drain (5); the insulating layer (2) is disposed between the substrate (1) and the active layer (3); the source (4) and the drain (5) are separately disposed on the side of the active layer (3) distant from the insulating layer (2) and spaced from each other; the active layer (3) is formed of a titanium dioxide nanofiber or a zinc oxide nanofiber, which is easy to chemically react with VOC gas, improves the gas detection reaction speed and sensitivity, has a large specific surface area, and increases the sensing area. The size of the sensor can be smaller at the same reaction speed level and sensitivity precision; the titanium dioxide nanofiber or zinc oxide nanofiber is prepared by means of electrostatic spinning technology; the manufacturing method is simple; the electrostatic spinning device is simple in process and high in production efficiency; it is beneficial to application of the gas sensor in consumer electronics, and popularization thereof in more application scenarios.
D: Disclosed is a physiological detection apparatus (100), comprising: at least one first detection electrode group (1), each first detection electrode group (1) including a first electrode (101) for coming into contact with the hand of a detected person, and a second electrode (102) for coming into contact with acupoint areas of the detected person; at least one second detection electrode group (2), each second detection electrode group (2) including a third electrode (201) and an opposite fourth electrode (202) which respectively come into contact with the periphery of acupoints of the detected person; and a micro-processor (3), wherein a human body loop is formed between the first electrode (101) and the second electrode (102) by means of a human body; a capacitor is formed between the third electrode (201) and the fourth electrode (202) by means of the skin of the detected person; the micro-processor (3) transmits a radio wave signal by means of the first electrode (101), receives, by means of the second electrode (102), the radio wave signal which is fed back, and calculates a first detection value by means of conversion; the micro-processor (3) detects a capacitance change and calculates a second detection value by means of conversion; and the micro-processor (3) analyses the first detection value and the second detection value to obtain a detection result. The physiological detection apparatus (100) detects the physiological state of a detected person in a non-intrusive manner, and thus does not bring discomfort and inconvenience to the detected person.
Answer: C