Why the sensors of automatic weather station should be calibrated frequently
Why should the sensors of automatic weather stations be calibrated frequently?
Why the sensors of automatic weather station should be calibrated frequently-radiation sensor calibration
In order to ensure the accuracy and reliability of the observation data of the automatic weather station that is put into operation, it is very important to regularly carry out the verification and calibration of the automatic weather station. Automatic weather station verification is divided into two methods: whole machine verification, sensor laboratory verification, and data collector on-site calibration
The measurement of radiant energy is the same as other physical quantities. It is necessary to establish a reference instrument, determine the measurement method of the reference instrument, and maintain and transfer the reference method. At present, China ’s radiation measurement standards are maintained and maintained by the National Meteorological Measurement Station. It consists of a PMO-6 absolute radiometer and two HF cavity absolute insolation meters. It is transmitted according to WRR, and the uncertainty is less than 0.25% and every 2 years Perform a verification of the instruments of the radiation station network to maintain the accuracy of the radiation measurement data of the station network.
The sensitivity verification of the radiation sensor is carried out under the conditions of solar radiation, the sky is clear, the sun height is greater than 30 °, the direct irradiance is greater than 500W / m², the temperature is 20 ℃ ± 10 ℃, the wind speed is less than 5m / s, and the relative humidity is less than 80%. Place the working standard radiometer parallel to the instrument under test on the outdoor verification platform without any obstacles on the sensing surface of the instrument. Use a high-precision multi-channel data collector (6-digit multimeter) to simultaneously measure the instantaneous solar radiation Value, the ratio of the voltage output value of the detected sensor to the radiation value corresponding to the standard radiation meter at the corresponding time is used as the sensitivity of the detected meter to complete the verification of the radiation sensor.
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