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介绍了一种利用软件实现热式风速风向传感器恒温差模式(CTD)控制的方案。传感器系统采用单片机作为主控单元,对芯片温度和环境温度进行采样,并以此为依据调节输出功率,从而实现恒温差状态的控制。实验表明,采用这种软件控制方案,在无风状态下,在-20℃到40℃的环境温度变化范围内,热式风速风向传感器能够基本维持输出信号恒定不变。除此之外,该风速风向传感器系统还可以实现对0~20 m/s风速范围内的风速测量,最大测量误差不超过8%,并且具有低于15 s的响应速度。
This paper introduces a scheme of using software to realize thermostatic differential temperature mode (CTD) control of thermal wind speed and direction sensor. The sensor system uses the single chip microcomputer as the main control unit, samples the temperature of the chip and the ambient temperature, and adjusts the output power on the basis of this to realize the control of the constant temperature difference state. Experiments show that using this kind of software control scheme, the wind speed and direction sensor can keep the output signal basically unchanged under the condition of no wind and in the range of ambient temperature from -20 ℃ to 40 ℃. In addition, the wind speed and direction sensor system can also measure the wind speed in the wind speed range from 0 to 20 m / s with a maximum measurement error of less than 8% and a response speed of less than 15 s.