Research and development of mine high precision wind speed sensor and temperature correction

Abstract

According to the requirements of mine production for ventilation monitoring system, an ultrasonic wind speed sensor with high precision and low starting wind speed is developed. Based on the measurement principle of ultrasonic time difference method, an ultrasonic wind speed sensor is designed. The propagation speed of ultrasonic in the air is superimposed with the wind flow speed. The propagation speed is accelerated in the along wind flow direction and slowed down in the counter wind flow direction. Under certain detection conditions, it corresponds to the wind speed function, and the accurate wind speed can be calculated. Through the analysis of the relationship between ultrasonic speed and temperature, it is proposed to correct the ultrasonic propagation speed through temperature compensation. Through experimental research, it is found that eliminating the measured value of wind speed with the difference between ultrasonic temperature and air temperature greater than 1 °C can improve the measurement accuracy.