Study Of Anemometer Based On The Temperature And Pressure Compensation

In order to address the inaccurate measurement problem of vortex anemometer caused by the change of gas characteristic because of temperature and pressure, this paper presents a method for measuring wind speed based on temperature and pressure compensation.On the basis of comprehensive analysis of the working principles of vortex anemometer and comparing the advantages and disadvantages of all kinds of anemometer,this paper proposes a new vortex type anemometer based on the temperature and pressure compensation, and through PC software for remote monitoring of the anemometer.Anemometer consists of wind speed measuring channel and processing circuit, the measurement channel includes signal generation body and the ultrasonic probe, the processing circuit is composed by ultrasonic signal generating circuit and signal processing circuit.Using CFD to design the signal generator module, this paper uses precision low power oscillator LTC1799 incentive ultrasonic transducer producing ultrasonic carrier signal with stable 150 KHz. Designed a series of analog circuit to process the ultrasound signal. The BMP180 of high-precision temperature and pressure sensors can measure temperature and pressure. Using stable performance AVR microcontroller Atmega128 as anemometers controller, which uses for data acquisition and processing, PC communication and real-time display. And Using virtual instrument Labview monitors the data of anemometer.Under the standard conditions and variable wind speed temperature wind speed tests,it proves that the actual measurement range of this design anemometer is 1.4m / s-30 m / s,the repeatability is less than 0.5%.