基于TDC-GP22的高精度声速仪设计与实现OA

In marine resource exploration and environmental monitoring activities,accurate measurement of underwater sound velocity in-formation is often required.A low-cost miniaturized sound velocity instrument is designed by using TDC-GP22.In response to the prob-lems of ultrasonic attenuation of the time of flight(TOF)method for measuring sound velocity,a variable threshold algorithm based on the first wave pulse width is proposed,which dynamically adjusts the detection threshold based on the first wave pulse width value of the echo signal,improving the stability of the measurement results.At the same time,by analyzing the common sources of errors in the sound velocity measurement process,a temperature compensation algorithm based on RBF neural network is designed in the dynamic calibration process of the system,which calibrates the frequency offset of the transducer and the acoustic electric delay caused by tem-perature.The sound velocity measurement results under different temperature and salt conditions indicate that the system can obtain high-precision underwater sound velocity information at a lower cost.