声表面波温度传感器抗干扰技术研究
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摘要
目的设计一种声表面波(SAW)温度传感器抗干扰技术,以提高温度测量的稳定性。方法分析SAW谐振器(SAWR)回波特性,建立SAWR回波信号熵能量模型,发现SAWR回波信号的衰减过程与熵能量的上升过程对应。当回波信号达到噪声水平时,熵能量的单调上升过程消失。为了抑制正弦干扰设计一种改进型自相关算法,利用该算法对信号进行去噪的同时使谐振器回波信号的衰减特性和正弦干扰的等幅特性得到保持。结果根据模拟仿真结果设置了SAWR回波信号的检测阈值(V_(thre)=1),并对该阈值进行了蒙特卡罗仿真实验。仿真结果表明,当信号信噪比大于4dB时,SAWR回波信号的检测率达到86%,而正弦干扰误检率小于0.5%。最后应用该算法对实际的正弦信号和SAWR回波信号进行了检测,得到的误检率接近于0。结论实验结果显示,所设计的算法可以用作声表面波温度传感器的抗干扰技术。
The work aims to develop an anti-interference technology for surface acoustic wave(SAW) temperature sensor so as to improve the stability of temperature measurement. The characteristics of surface acoustic wave resonator(SAWR) response were analyzed, and the entropy energy model of SAWR response was established. The attenuation process of SAWR response corresponded to the rising process of entropy energy. The monotonous rising process of entropy energy disappeared when the response signal reached the noise level. An improved auto-correlation algorithm was designed to reduce the influence of the sinusoidal interference. The designed algorithm can remove the noise when maintaining the decay characteristics of the resonator response and the equal-amplitude characteristics of the interference signal. The detection threshold(V_(thre)=1) of the SAWR response signal was set up based on the simulation results and the Monte Carlo simulation experiments were performed on the threshold value. Simulation results showed that when the signal to noise ratio(SNR) was greater than 4 dB, the SAWR response detection rate reached 86%, and false detection rate of the sinusoidal interference was less than 0.5%. Finally, the proposed algorithm was used to detect the actual sinusoidal signal and SAWR response. The false detection rate was close to 0. The experimental results show that the designed algorithm can be used as the anti-interference technology of SAW temperature sensor.
The work aims to develop an anti-interference technology for surface acoustic wave(SAW) temperature sensor so as to improve the stability of temperature measurement. The characteristics of surface acoustic wave resonator(SAWR) response were analyzed, and the entropy energy model of SAWR response was established. The attenuation process of SAWR response corresponded to the rising process of entropy energy. The monotonous rising process of entropy energy disappeared when the response signal reached the noise level. An improved auto-correlation algorithm was designed to reduce the influence of the sinusoidal interference. The designed algorithm can remove the noise when maintaining the decay characteristics of the resonator response and the equal-amplitude characteristics of the interference signal. The detection threshold(V_(thre)=1) of the SAWR response signal was set up based on the simulation results and the Monte Carlo simulation experiments were performed on the threshold value. Simulation results showed that when the signal to noise ratio(SNR) was greater than 4 dB, the SAWR response detection rate reached 86%, and false detection rate of the sinusoidal interference was less than 0.5%. Finally, the proposed algorithm was used to detect the actual sinusoidal signal and SAWR response. The false detection rate was close to 0. The experimental results show that the designed algorithm can be used as the anti-interference technology of SAW temperature sensor.
引文
[1]赵彬,黄美娜,袁毅,等.贮藏温度对微孔膜包装茶树菇的保鲜效果影响[J].包装工程,2017,38(9):41-45.ZHAO Bin,HUANG Mei-na,YUAN Yi,et al.Effect of Storage Temperature on Agrocybe Aegerita Packaged with Micro-porous Film[J].Packaging Engineering,2017,38(9):41-45.
[2]王宝刚,李文生,侯玉茹,等.常温运输后甜樱桃不同温度贮藏品质变化研究[J].包装工程,2015,36(9):28-32.WANG Bao-gang,LI Wen-sheng,HOU Yu-ru,et al.Quality Changes of Sweet Cherry During Storage at Different Temperature after Transportation at Room Temperature[J].Packaging Engineering,2015,36(9):28-32.
[3]吴行印,谢晶,王旭.不同贮藏温度下小黄鱼货架期预测模型的建立和评价[J].包装工程,2016,37(19):84-90.WU Xing-yin,XIE Jing,WANG Xu.Establishment and Evaluation of the Shelf-life Prediction Model for Small Yellow Croaker under Different Store Temperatures[J].Packaging Engineering,2016,37(19):84-90.
[4]FAN Y,JI X,CAI P,et al.Packaging the SAW Torque Sensor with Teflon[C]//IEEE International Frequency Control Symposium(FCS),2014:1-5.
[5]SERGEI Z,ALEXANDER S,IVAN A,et al.SAWTemperature Sensor on Quartz[J].IEEE Transactions on Ultrasonics,Ferroelectrics,and Frequency Control,2015,62(6):1066-1075.
[6]LAMOTHE M,PLESSKY V,FRIEDT J M,et al.Ultra-wide Band SAW Sensors and Tags[J].Electronics Letters2013,49(24):1576-1577.
[7]BENNETT J M,CLAYTON W M,CUNHAM P D.Hydrogen Fluoride Gas Detection Mechanism on Quartz Using SAW Sensors[J].IEEE Sensors Journal,2011,9(11):1768-1775.
[8]FAN Y,JI X,CAI P.Analyzing the Installation Angle Error of SAW Torque Sensor[J].Measurement Science and Technology,2014,25(9):1-6.
[9]FAN Y,JI X.A Novel Rotation Speed Measurement Method Based on Surface Acoustic Wave[J].Acoustical Physics,2018,64(1):122-128.
[10]FLORIAN B,FABIEN J,RACHEL E M,et al.Design of SH-surface Acoustic Wave Sensors for Detection of Ppb Concentrations of BTEX in Water[C]//2013 Joint European Frequency and Time Forum&International Frequency Control Symposium(EFTF/IFC),2013:628-631.
[11]ANDEL J C,VETELINO J F.Acoustic Wave Biosensors[J].Sensor and Actuators(A),1994,44:167-176.
[12]JI X,FAN Y,XIAO Q,et al.Passive Wireless Measurement of Tension for Overhead Transmission Line Based on Surface Transverse Wave[J].IET Generation,Transmission&Distribution,2018,12(8):1866-1871.
[13]FAN Y,JI X,CAI P,et al.Non-destructive Detection of Rebar Buried in a Reinforced Concrete Wall with Wireless Passive SAW Sensor[J].Measurement Science Review,2013,13(1):25-28.
[14]ZHAO J,ZHANG Y,YE M.Research on the Received Signal Strength Indication Location Algorithm for RFID System[C]//In Proc IEEE Sym Commun Inform Technol,2006:881-885.
[15]JI X,FAN Y,QI H,et al.A Wireless Demodulation System for Passive Surface Acoustic Wave Torque Sensor[J].Rewiew of Scientific Instruments,2014,85:125001-125008.
[2]王宝刚,李文生,侯玉茹,等.常温运输后甜樱桃不同温度贮藏品质变化研究[J].包装工程,2015,36(9):28-32.WANG Bao-gang,LI Wen-sheng,HOU Yu-ru,et al.Quality Changes of Sweet Cherry During Storage at Different Temperature after Transportation at Room Temperature[J].Packaging Engineering,2015,36(9):28-32.
[3]吴行印,谢晶,王旭.不同贮藏温度下小黄鱼货架期预测模型的建立和评价[J].包装工程,2016,37(19):84-90.WU Xing-yin,XIE Jing,WANG Xu.Establishment and Evaluation of the Shelf-life Prediction Model for Small Yellow Croaker under Different Store Temperatures[J].Packaging Engineering,2016,37(19):84-90.
[4]FAN Y,JI X,CAI P,et al.Packaging the SAW Torque Sensor with Teflon[C]//IEEE International Frequency Control Symposium(FCS),2014:1-5.
[5]SERGEI Z,ALEXANDER S,IVAN A,et al.SAWTemperature Sensor on Quartz[J].IEEE Transactions on Ultrasonics,Ferroelectrics,and Frequency Control,2015,62(6):1066-1075.
[6]LAMOTHE M,PLESSKY V,FRIEDT J M,et al.Ultra-wide Band SAW Sensors and Tags[J].Electronics Letters2013,49(24):1576-1577.
[7]BENNETT J M,CLAYTON W M,CUNHAM P D.Hydrogen Fluoride Gas Detection Mechanism on Quartz Using SAW Sensors[J].IEEE Sensors Journal,2011,9(11):1768-1775.
[8]FAN Y,JI X,CAI P.Analyzing the Installation Angle Error of SAW Torque Sensor[J].Measurement Science and Technology,2014,25(9):1-6.
[9]FAN Y,JI X.A Novel Rotation Speed Measurement Method Based on Surface Acoustic Wave[J].Acoustical Physics,2018,64(1):122-128.
[10]FLORIAN B,FABIEN J,RACHEL E M,et al.Design of SH-surface Acoustic Wave Sensors for Detection of Ppb Concentrations of BTEX in Water[C]//2013 Joint European Frequency and Time Forum&International Frequency Control Symposium(EFTF/IFC),2013:628-631.
[11]ANDEL J C,VETELINO J F.Acoustic Wave Biosensors[J].Sensor and Actuators(A),1994,44:167-176.
[12]JI X,FAN Y,XIAO Q,et al.Passive Wireless Measurement of Tension for Overhead Transmission Line Based on Surface Transverse Wave[J].IET Generation,Transmission&Distribution,2018,12(8):1866-1871.
[13]FAN Y,JI X,CAI P,et al.Non-destructive Detection of Rebar Buried in a Reinforced Concrete Wall with Wireless Passive SAW Sensor[J].Measurement Science Review,2013,13(1):25-28.
[14]ZHAO J,ZHANG Y,YE M.Research on the Received Signal Strength Indication Location Algorithm for RFID System[C]//In Proc IEEE Sym Commun Inform Technol,2006:881-885.
[15]JI X,FAN Y,QI H,et al.A Wireless Demodulation System for Passive Surface Acoustic Wave Torque Sensor[J].Rewiew of Scientific Instruments,2014,85:125001-125008.