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《Journal of Tianjin University of Technology》 2007-01
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Method to realize demodulation in wireless SAW sensor system

WU Yi-zhuo,CHEN Xi-ming,SU Lin,SUN Yan-zan(School of Electronics Information and Communications Engineering,Tianjin University of Technology,Tianjin 300191,China)  
A passive wireless SAW sensor system is introduced.The narrow-band reflected signal by SAW is analyzed.The math theory of how to demodulate the narrow-band reflected signal by SAW,and that is based on the digital is introduced.Matlab software is applied on demodulating the narrow-band reflected signal by SAW,the reason of phase error is brought forward.The excellence and application of the digital quadrature demodulation is proveded.The hardware block of the instrument is presented.The system is based on the flexity and lower cost of vitural instrument.At last,the method of hardware to realize the digital quadrature demodulation by LabVIEW is advanced.
【Fund】: 天津市自然科学基金(033700611);; 天津市重点实验室基金(20042001)
【CateGory Index】: TP212
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