Self-calibration ultrasonic wind speed measurement method

Abstract

The invention discloses a self-calibration ultrasonic wind speed measurement method capable of accurately measuring the wind speed and the wind direction. The self-calibration ultrasonic wind speed measurement method is characterized by orderly comprising the steps of carrying out initialization, absorbing ultrasonic waves by a pair of ultrasonic probes positioned in the same dimension to obtain the bi-directional ultrasonic propagation time Tab and Tba between the ultrasonic probes, collecting the ultrasonic environment temperature C, calculating the propagation time Vs of the ultrasonic waves in the air according to a formula of Vs=331.3+0.607*C, calculating the distance D between the ultrasonic probes in the same dimension according to the formula, calculating the wind speed Vw and the wind direction Theta according to the formula, and outputting the wind speed and the wind direction.

Description

technical field [0001] The invention relates to an ultrasonic wind speed measurement method, in particular to a self-calibration ultrasonic wind speed measurement method which can accurately measure wind speed and wind direction. Background technique [0002] In the past, the measurement of wind speed and direction basically used a mechanical anemometer consisting of a wind cup, a wind vane, and blades. The mechanical anemometer is not only restricted by low temperature, dust and other environments during use, but its mechanical parts are also prone to wear and aging, which cannot guarantee long-term reliable operation. Its measurement range is narrow (2~40m / s) and the error is large ( greater than 2%) and cannot measure instantaneous wind speed. For this reason, ultrasonic anemometers are commonly used at present. Compared with the mechanical anemometer, the ultrasonic anemometer has no moving parts, no mechanical wear, high reliability and long service life; it has good ...

AI Technical Summary

Problems solved by technology

[0005] 2. After installation, the software adjustment and compensation operation is cumbersome, time-consuming and labor-intensive

Especially when installing an anemometer on the top of moving equipment such as vehicles, ships, and mobile platforms, the wind direction angle will change with the movement of the equipment base. Reorientation is not only troublesome but also easy to cause errors, which will affect the accuracy of the measured wind direction.