Patent ID: 7121719
Filing Date: 2006-10-17
Classification: G01K

Abstract:
1. A radio-thermometer system, comprising: an antenna for receiving thermal energy radiated from a target object having a temperature T to be measured; first and second noise sources, which are maintained at different temperatures in order to obtain a reflection coefficient Γ of an interface between the antenna and the target object; a first switch for periodically switching between outputting an output of the first or second noise source in response to a first pulse signal; a circulator for adding a signal received by the antenna to a reflective wave output from the first or second noise source, via the first switch, and for transmitting an addition result in one direction; third and fourth noise sources, which are maintained at different temperatures; a second switch for periodically switching between outputting an output of the third noise source, an output of the circulator, and an output of the fourth noise source in response to a second pulse signal, the second pulse signal being in synchronization with the first pulse signal; and an amplifier for amplifying an output of the second switch.