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A Phase Readout Method for Wireless Passive sensor Used in Pressure Measurement System

Chinese Journal of Electronics 2015年第4期24卷 702-708页

作者： HONG Yingping LIANG Ting ZHENG Tingli ZHANG Hairui LIU Wenyi XIONG Jijun Key Laboratory of Instrumentation Science & Dynamic Measurement Ministry of Education North University of China Science and Technology on Electronic Test & Measurement Laboratory North University of China

A phase difference detection method used for reading the resonant frequency through mutual coupling is designed to meet the pressure measurement in harsh environments, and a testing device of integrated modular by developing the hardware circuits is *** and discussion of the novel theoretical model in the phase readout system is presented, and a pressure test platform based on the phase difference detection is also established, which is to measure the frequency of a lc resonant sensor on the basis of 96% alumina ceramic substrate. The experimental results show that the proposed phase difference readout system presents sweep-frequency detection in the range of 1–100MHz bandwidth, and a high frequency resolution of 0.006 MHz. Sensitivity of the sensor is approximately 0.225 MHz/bar from 1 bar to 2 bar. The accuracy and functionality of the phase readout system have emphasized a wider engineering application range, so that we can make it possible that the wireless passive lc resonant sensor revolves well in practical engineering occasions outside the laboratory environment.

关键词： lc resonant sensor resonant frequency Phase difference detection Pressure test

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Design of Linear Sweep Source Based on DDS Used in Readout System for Wireless Passive Pressure sensor

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Photonic sensors 2014年第4期4卷 359-365页

作者： Yingping HONG Science and Technology on Electronic Test & Measurement Laboratory North University of China Taiyuan 030051China Key Laboratory Instrumentation Science & Dynamic Measurement Ministry of Education North University of ChinaTaiyuan 030051 China

This paper proposes the design and research on the high bandwidth linear frequency sweep signal source involved in the readout unit module of the wireless passive pressure sensor in high temperature based on the principle of mutual inductance coupling which is applied widely at present. The operating principle of the linear sweep frequency source based on the direct digital frequency synthesis （DDS） technology is introduced, and the implementation method of the hardware circuit and logic sequential control process required in our system has been realized utilizing this technology. Through the experiments under different conditions of the step value, the sweep range and other related design indicators, the influence on the extraction method of resonance frequency information, extraction accuracy, and others during the readout system of the mutual inductance coupling sensor are analyzed and studied. The design of the linear frequency sweep signal source is realized with a resonance frequency change resolution of 6 kHz, a minimum step value of 1 kHz, and a precision of frequency for 0.116 Hz within the sweep width of 1 MHz - 100MHz. Due to the use of the integrated commercial chip, the linear sweep frequency source is made small in size, high working frequency, high resolution and low step values for the readout unit modularized of a higher application value.

关键词： Direct digital frequency synthesizer lc resonant sensor resonant frequency pressure test

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