CHENG Jun, ZHANG Jin, WANG Bo-xiong. Study of echo signal processing for time-differencing ultrasonic measurement[J]. 2012, 31(12): 34-37. DOI: 10.13873/j.1000-97872012.12.017.
An echo signal processing method combining software and hardware for time-differencing ultrasonic measurement is studied.The hardware constitution and realization method
the software design procedure
and the major functions of the software are described.An ultrasonic echo signal conditioning module extracts original ultrasonic wave signal from the receiving transducer and converts it into a stable echo signal which is easy to process by the follow-up processing circuit.By using programmable property of FPGA
digital signal processing module is designed
with which the zero-crossing comparison signal and the threshold comparison signal are obtained to lock up the arriving time of echo signal.
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references
FPGA-based High-precision Measurement Algorithm for the Ultrasonic Echo Time of Flight [J]. 王伯雄,张金. Journal of Measurement Science and Instrumentation . 2010(02)