Method and system for automatic calibration of pressure difference zero point value of wind speed measurement

Abstract

The invention discloses a method and system for automatically calibrating the pressure difference zero point value of wind speed measurement, collecting the pressure difference zero point value and the pressure difference measurement value, and calculating the differential pressure value between the pressure difference measurement value and the pressure difference zero point value , and judge whether to re-measure and update the zero-point value of the pressure difference according to the differential pressure value, the wind speed and the time interval. The invention provides a method for automatic calibration of the pressure difference zero point value of flow velocity measurement. The automatic calibration of the pressure difference zero point value includes the automatic calibration of the first power-on and the cycle calibration during the measurement process. The initial value of the differential pressure zero point value of the differential pressure anemometer is accurately assigned, and the cyclic calibration during the measurement process can automatically calibrate the differential pressure zero point value according to the ambient temperature parameters of the differential pressure anemometer sensor, thereby correcting the temperature drift and zero point drift on the wind speed measurement value to improve the accuracy of the measurement results.

Description

technical field [0001] The invention relates to the field of wind speed monitoring of underground coal mine pipelines, in particular to a method and system for automatically calibrating a pressure difference zero point value of wind speed measurement. Background technique [0002] Wind speed monitoring is an important parameter index for safe production in coal mines. The technical level of wind speed monitoring is the cornerstone to ensure safe production in coal mines. Generally, a differential pressure wind speed sensor based on the principle of differential pressure is used to measure the wind speed in coal mines. Due to the combined effects of various reasons such as the inherent unconventional nature of the pressure element itself, the delay nonlinearity of multi-value correspondence, the temperature zero-point drift characteristics, and the uncertainty of time drift, the lower limit accuracy of the existing differential pressure anemometer can only be Reaching 0.4m / s ...

AI Technical Summary

Problems solved by technology

[0002] Wind speed monitoring is an important parameter index for safe production in coal mines. The technical level of wind speed monitoring is the cornerstone to ensure safe production in coal mines. Generally, a differential pressure wind speed sensor based on the principle of differential pressure is used to measure the wind speed in coal mines. Due to the combined effects of various reasons such as the inherent unconventional nature of the pressure element itself, the delay nonlinearity of multi-value correspondence, the temperature zero-point drift characteristics, and the uncertainty of time drift, the lower limit accuracy of the existing differential pressure anemometer can only be Reaching 0.4m / s hinders the measurement of the full range of wind speed by the differential pressure anemometer. Among many factors, the temperature zero drift of the differential pressure element has a greater impact on the lower limit accuracy of the differential pressure anemometer

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