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《Chinese Journal of Sensors and Actuators》 2008-10
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Research on the Technique of Measuring Tunnel Wind Speed by Ultrasonic

OU Bing-jie,DUAN Fa-jie(State Key Lab of Precision Measurement Technology &Instruments,Tianjin University,Tianjin 300072,China)  
A new method based on the technology of phase-difference detection to measure tunnel wind speed by ultrasonic is researched,and the measurement system is proposed.The new method overcomes the defects(the complexity of circuit and the difficulty in signal processing)of traditional time-difference method and reaches high measure accuracy in real-time detection of tunnel wind speed.The new system adopts one emitting sensor and two couples of receiving sensors to measure wind speed in two different ranges,not only ensures measure limits but also improves precision in low wind speed measure.The system cored as a chip microprocessor ATMEGA128,uses CPLD to realize high precision digital phase detecting.With the help of CPLD,the system improves the precision in data processing.Temperature compensating technique is adopt to further increase the measure accuracy.Compared with the traditional methods,the measure precision of the system is remarkably improved.
【CateGory Index】: U458.1
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