Abstract
A phase difference detection method usedfor reading the resonant frequency through mutual coupling is designed to meet the pressure measurement inharsh environments, and a testing device of integratedmodular by developing the hardware circuits is proposed.Description and discussion of the novel theoretical modelin the phase readout system is presented, and a pressuretest platform based on the phase difference detection isalso established, which is to measure the frequency of a LCresonant sensor on the basis of 96% alumina ceramic substrate. The experimental results show that the proposedphase difference readout system presents sweep-frequencydetection in the range of 1–100MHz bandwidth, and a highfrequency resolution of 0.006MHz. Sensitivity of the sensoris approximately 0.225 MHz/bar from 1 bar to 2 bar. Theaccuracy and functionality of the phase readout systemhave emphasized a wider engineering application range, sothat we can make it possible that the wireless passive LCresonant sensor revolves well in practical engineering occasions outside the laboratory environment.
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