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《Instrument Technique and Sensor》 2014-01
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High-precision Ultrasonic Measurement System for Micro-Distance

NI Wei-ning;ZHU Zu-yang;ZHANG Wei;LI San-guo;LI Sheng;Research Institute of Petroleum Engineering Technology,SINOPEC;Division of Oil Technology China Oilfield Services Limited;  
In this paper,the principle of ultrasonic distance measurement is described and the special requirements of caliper measurement are analyzed also. A low-blind,low-power,high-precision,small size ultrasonic distance measurement system is designed and implemented. Because the variable gain detection circuit and the several gain calibrations are utilized,the first echo signal frontier is captured by the comparator and the precision of measurement is effectively improved. The experimental results show that the measuring precision is ± 1 mm,the blind distance is 25 mm,when 1 MHz ultrasonic transducers and 100mW transmit power are chosen.
【CateGory Index】: TH761.2
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