Study on TDC Method of Ultrasonic Liquid Temperature Measurement
Ultrasonic temperature measurement uses ultrasonic propagation time as measurement information,and the error of time measurement has a significant impact on the performance of temperature measurement system.To solve the above problems,an ultrasonic water temperature measurement system based on time to digital converter(TDC)is designed.According to the rela-tionship between propagation time and temperature,the system uses FPGA and hardware circuit of TDC-GP22,which is a high precision time measurement chip,combined with software program algorithm to effectively reduce the influence of time measure-ment error.Through reasonable design of driving circuit and signal processing circuit,the resolution of ultrasonic propagation time measurement can reach 1.0×10-10s,The resolution of temperature measurement can reach 0.001℃ .Experiments show that the system has the advantages of high resolution and high repeatability.
Ultrasonic Temperature MeasurementTDC-GP22Time MeasurementHigh Resolution
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