提高声表面波传感器检测精度的方法  

Novel Method of Improving Detection Precision of SAW Sensor

作　　者：刘丹平[1] 刘亚[1] 刘晓明[1] 胡学斌[2] 彭云[1] 汪梦柔[1] 曾孝平[1] 冯文江[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044 [2]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《压电与声光》2012年第4期498-500,共3页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金重点资助项目(1010200220100131);重庆大学研究生科技创新基金创新资助项目(CDJXS11160018)

摘　　要：在利用声表面波(SAW)进行检测的系统中,回波相位解调的相位模糊严重影响检测精度。针对延迟线型声表面波温度传感器,理论分析表明,结合时延测量和相位测量的解调方法可唯一确定待测量;实验证明,在温度变化较大的范围内,该方法能解决相位模糊问题,检测精度可达0.5℃。In the detection system based on SAW, the detection precision is affected by the phase ambiguity of the echo phase demodulation. The theory analysis showed that the demodulation method combining the time delay measurement with the phase measurement could uniquely determine the physical quantity to be measured for the delay line SAW sensor. The experiment verified that the proposed method could solve the phase ambiguity problem within a large temperature range and the detection accuracy could be up to 0.5 ℃.

关 键 词：声表面波 传感器 相位模糊 相位解调 时延解调 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]