Method for calibrating forescattering cloud droplet particle detector and device thereof

Abstract

The invention discloses a method for calibrating a forescattering cloud droplet particle detector and a device thereof. The method is to calibrate by simulating cloud droplet particles by using a group of ostiole apertures in a diameter range of between 5 and 50 mu m. The calibration device comprises a three-dimensional translation stage, a speed regulating motor, a rotating disc, an aperture clamp and a group of ostiole apertures in the diameter range of between 5 and 50mu m, wherein the speed regulating motor is fixed on the three-dimensional translation stage and moves with the three-dimensional translation stage along the detecting laser transmission direction of the forescattering cloud droplet particle detector and the direction vertical to the detecting laser; the rotating disc is fixedly connected with a rotating shaft of the speed regulating motor through a circle center; a screw hole is reserved on the rotating disc; the aperture clamp consists of a hollow cylindrical body and a press thread, threads are carved at the periphery of the body, the diameter of the periphery of the body and the diameter of the screw hole on the rotating disc are adaptive, and the body and the screw hole are connected and fixed with each other through the threads; and the outer diameter of the ostiole apertures is adaptive to the inner hole diameter of the body of the aperture clamp, and the ostiole apertures are fixed in the inner hole of the aperture clamp through the press thread.

Description

Technical field [0001] The invention relates to a calibration method of an instrument, in particular to a calibration method and device for a forward scattering cloud droplet particle detector in an airborne cloud particle measurement system. Background technique [0002] With the continuous deepening and development of meteorological science research, great progress has been made in meteorological observation capabilities and technical means. However, for the microphysical observation of particles such as clouds and aerosols, the most effective method is a direct measurement instrument based on laser technology. The laser particle counter is a special instrument for measuring the particle size and distribution of various particles in the atmosphere. The application of environmental monitoring, air purification and atmospheric science research has become increasingly widespread. Since the 1970s, the United States has developed an automated airborne cloud particle measurement sys...

AI Technical Summary

Problems solved by technology

This calibration method has the following problems: firstly, this specially processed glass sphere with a fixed size is very expensive due to the difficulty in processing; secondly, even with such an expensive glass sphere, it is difficult to ensure that each glass sphere The ball is a standard spherical shape and the size is consistent with the nominal size. If the glass ball is non-spherical, it will be contrary to the design principle of FSSP. If the size is different from the nominal size, it will also cause errors; again, when using glass balls for calibration , the glass ball is ejected by the suction ear ball. Obviously, the speed of the glass ball is very different from the particle speed in the actual measurement process. This difference causes the time domain characteristics of the photoelectric signal of the receiving system to be different, and the electrical signal must be amplified before screening. , different time domain widths lead to different amplification capabilities of amplifiers on signals, resulting in errors caused by speed

Finally, the calibration process has poor repeatability due to differences in the glass sphere particles themselves, as well as differences in the operation of the ear-suction spheres

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