Calibrating method of forward scattering type visibility meter

Abstract

The invention discloses a calibrating method of a forward scattering type visibility meter. The calibrating method is characterized in that a plurality of standard measuring points of the forward scattering type visibility meter in a full scale are quantitatively simulated through combination of a diffuse scattering board and attenuation sheets with different transmittances, and a coefficient of the forward scattering type visibility meter is modified by using a modifier formula, and therefore, the forward scattering type visibility meter is calibrated. The calibrating method is applied to the calibration after the forward scattering type visibility meters are produced in batch and used for a long time; the coefficient of the forward scattering type visibility meter can be accurately, conveniently and rapidly modified, and thus the accuracy and consistency of the forward scattering type visibility meter are improved, and the difficulty that the forward scattering type visibility meter can not be rapidly and accurately calibrated indoors is solved. The calibrated forward scattering type visibility meter and a standard meter are experimentally compared, the measurement error of the visibility within 10kilometers is less than 10 percent, the measurement error of the visibility of more than 10 kilometers is less than 20 percent, and the forward scattering type visibility meter accords with the requirement of accuracy in requirements of functions and specifications of forward scattering type visibility meters issued by the China Meteorological Administration.

Description

technical field [0001] The invention relates to a calibration method for a forward scattering type visibility meter, which belongs to the field of meteorological parameter measurement. Background technique [0002] Visibility is an important monitoring indicator of severe weather phenomena such as urban haze and sandstorms. At the same time, low visibility will also pose a serious threat to public safety areas such as transportation. Therefore, real-time automatic monitoring of visibility is of great significance. The visibility meter can realize real-time automatic observation of atmospheric visibility, and replace the traditional observation method of manual visual inspection. It is of great significance for accurately grasping weather conditions and carrying out early warning and control of meteorological disasters. [0003] At present, the objective visibility in meteorology is defined as Meteorological Optical Range (MOR), which refers to the atmospheric path length tha...

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Problems solved by technology

However, this method is only a point calibration on the low visibility end (tens of meters), and its effect is equivalent to a stable low visibility aerosol cluster, which cannot guarantee accurate calibration on the high visibility side, so that the instrument cannot be guaranteed. Accuracy in higher visibility, and the upper limit of visibility measurement required by meteorological observation is at least 10 kilometers, so it is necessary to perform multi-point calibration of forward scattering visibility on the entire range end

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