提高超声波物位检测精度方法的研究  

Study on New Methods of Improving the Precision of the Ultrasonic Level Meter

作　　者：张淑清[1] 靳世久[2] 李隽[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004 [2]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《传感技术学报》2007年第7期1652-1654,共3页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金资助项目(60102002);河北省博士基金资助项目(B2004522)

摘　　要：针对超声物位检测中声速随温度变化、回波信号弱和信噪比低的问题,对提高超声物位检测系统的测量精度进行了研究.提出加装温度传感器和自校准装置两套温度补偿方案.针对回波信号弱的问题提出一种利用间歇混沌进行微弱信号检测的技术.给出理论分析和仿真试验.实验证明该方法可准确实现对回波信号的特征提取,具有较高的信噪比.Aiming at the problems of the ultrasonic velocity dependence on temperatures, weakness of signals received and low signal-to-noise ratio, the methods of improving the precision of the ultrasonic level meter are studied. The two temperature compensating methods： temperature transducer installation and self-calibration equipment installation are presented. Regarding of the weakness of received signal, a new technology using intermittent chaotic theory to detect weak signal is advanced. The theory analysis and simulation experiment has been described. The detecting experiment demonstrates that this technology can distinguish the useful signal from environmental noise clearly, and extract the feature from the received signal with higher signal-to-noise ratios.

关 键 词：超声波 物位检测 温度补偿 弱信号检测 间歇混沌 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]