Physical quantity measuring device and physical quantity measuring system
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United States of America Patent
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Aug 28, 2018
Grant Date -
Dec 17, 2015
app pub date -
Aug 24, 2015
filing date -
Feb 25, 2013
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Abstract
An excitation signal generation unit generates excitation signals of frequency channels with mutually different frequency bands and transmits the excitation signals via an antenna. Reception signals of the frequency channels received by the antenna are inputted to a reception strength detection unit. The reception strength detection unit detects a resonance reverberation signal from the reception signals and detects the signal strength of the resonance reverberation signal. An excitation control unit controls the excitation signal generation unit to adjust the signal strength of the excitation signal such that the signal strength of the resonance reverberation signal reaches or falls below a level adjustment threshold. Upon the signal strength of the resonance reverberation signal reaching or falling below the level adjustment threshold, a temperature detection unit subjects the resonance reverberation signal to a frequency analysis so as to detect a physical quantity on the basis of a frequency spectral peak.
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