The traditional ultrasonic transit time measurement method has many shortcomings,such as low measurement accuracy,need to manually save data and so on.To solve above problems,this paper puts forward the ultrasonic transit time measurement system based on FPGA,FPGA as the main control,MS1022 as core,measuring the pulse counting method and the combination of coarse and fine measurement method of time difference measurement of ultrasonic transit time,obtained with Mrs Grubbs criteria,eliminating bulky error,after processing the data real-time display in the upper machine and automatic preservation.The test results show that the resolution of the system can reach 0.01 μs,the error rate is about 1%,and it has the advantages of small size,flexible use,and can be widely used in related fields.
Key words
ultrasonic transit time /
FPGA /
MS1022 /
time difference method /
Grubbs criterion
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