Research And Design Of Ultrasonic Wind Measurement Instrument Based On ARM

The wind is one of environmental factors in many areas. Nowadays, using ultrasonic to measure wind was widely applied, but it still has many shortcomings in technology. Based on the traditional ultrasonic wind measurement instrument basic principle, this paper designed a kind of all-weather ultrasonic wind measurement instrument which had temperature and humidity sensor by measuring the medium temperature and humidity data, then compensate for the environmental temperature and humidity factors. Compared to the other all kinds of instruments, it has many advantages such as:reduce the influence of temperature and humidity; higher measurement precision; it can measure in intelligent all-weather.This paper elaborated on design process and research methods of ultrasonic wind measurement instrument based on ARM. Firstly, it researched for the current wind speed measurement methods and characteristics, comparing different wind the measure precision of the systems and measuring scope, determined a time difference method ultrasonic wind speed measurement system based on the ARM microcontroller. Secondly, set up the hardware platform, ARM as control core, digital temperature and humidity sensors SHT71as temperature and humidity signal acquisition system for modular hardware design, reasonable choice and improve the system’s power supply circuit, a clock circuit, reset circuit, transceiver circuit, and an A/D converter circuit device design, so as to improve the system timer precision, anti-jamming ability and stability. Software design included startup code, the system initialization, data acquisition and processing etc, at the same time, used arithmetic average filtering method and temperature and humidity compensation algorithm for data signal processing for more accurate measurements. At last, combined with experimental device, this paper did the experimental verification and analyzed system error, which laid the foundation to further develop the practical application system, The experiment showed that the device can achieve all-weather precision measurement of wind speed and measurement error is smaller, it provides effective design method for ultrasonic wind speed measurement applications in harsh environments.