Laser forward scattering cloud droplet spectrum detection system

Abstract

The invention relates to a laser forward scattering cloud droplet spectrum detection system. The system utilizes mie forward scattering signals, which are generated by irradiating micro water steam particles in the air by laser beams, to measure the spectral distribution of water steam and water steam content of atmosphere. A red light semiconductor laser with uniform strength is adopted as the irradiation source, and through laser beam alignment and focusing, a sampling area with a certain size is formed in the space. Scattering signals can be generated by irradiating particles in the sampling area by laser beams, and the distribution of cloud particles with a size of 2 to 50 [mu]m can be measured through forward scattering signal measurement, deep field inner particle judgment, and double channel weak signal detection. The provided system has the characteristics of small volume, compact structure, realtime measurement, and high measurement precision, and is widely used in fields such as realtime artificial rainfall enhancement, cloud particle distribution determination, cloud physical research, and the like.

Description

technical field [0001] The invention belongs to the technical field of laser detection, and relates to a laser forward scattering cloud droplet spectrum detection system, which is used for measuring the distribution of water vapor droplet spectrum and water vapor content in the atmosphere. Background technique [0002] The laser forward scattering detection system used to measure aerosols in the atmosphere in the prior art uses the Mie forward scattering signal of the laser and the differential absorption principle of tiny aerosol particles in the air to measure specific types of atmospheric aerosols. [0003] For example, the patent titled "System and Method for Measuring Harmful Particles" disclosed in US Patent No. US 2006 / 0232776 A1 is such a measuring device. It uses multiple lasers with different wavelengths as the emission source, one of which is used as the reference light, and the other beams are used as the detection light. If there is a specific type of harmful ae...

AI Technical Summary

Problems solved by technology

There are multiple optical lenses in the optical path that are fully reflective to lasers of a certain wavelength and fully transparent to lasers of other wavelengths. This optical lens has the defects of difficult processing, high manufacturing cost and high cost.

In addition, when it is detecting, due to the weak scattering signal, the scattering coefficient of each wavelength laser is inconsistent, and the intensity comparison of the scattering signal is easy to be misjudged, which affects the measurement accuracy and measurement accuracy.

Moreover, this patent can only measure the types of aerosol particles, but cannot obtain the diameter and distribution of aerosol particles

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