Particle counter

By using cylindrical lenses and focus lenses to compress and collimate the beams in the particle counter, the problem of insufficient beam uniformity and accuracy is solved, and the counting accuracy is improved and the generation of stray light is reduced.

CN222812735UActive Publication Date: 2025-04-29SUZHOU SUXIN ENVIRONMENT SCI & TECH CO LTD
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Patent Information

Application Number
CN202420818799.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-19
Publication Date
2025-04-29
Estimated Expiration
2034-04-19

AI Technical Summary

Technical Problem

In the process of identifying small particle size particles, existing particle counters are affected by various noise signals, resulting in insufficient uniformity and accuracy of the light beam, affecting the counting accuracy.

Method used

The first cylindrical lens and the second cylindrical lens respectively compress and collimate the fast and slow axis of the light beam, and guide the light beam into the optical fiber through the first focusing lens, and then the light beam is concentrated by the second focusing lens, so that a more homogenized flat top beam is obtained at the photosensitive area.

Benefits of technology

The spot intensity in the photosensitive area is achieved more uniform, reducing the generation of stray light during the beam propagation, and improving the counting accuracy of the particle counter.

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Abstract

The utility model provides a particle counter which comprises a shell, a light channel used for light beam propagation and a cavity used for scattering are arranged in the shell, the light channel is communicated with the cavity, and a light source assembly used for emitting light beams, a light guiding assembly, a scattered light collecting assembly and a light collecting structure are sequentially arranged from the light channel to the cavity. A light beam enters the cavity after being guided by the light guiding assembly, the scattered light collecting assembly and the light collecting structure are combined with the shell at the position of the cavity, the light source assembly and the light guiding assembly are sequentially arranged on a light channel path along a light beam propagation path, and the light guiding assembly comprises an optical fiber and a lens set. The lens group comprises a first cylindrical lens, a second cylindrical lens and a second focusing lens. According to the utility model, the particle counter can obtain more homogenized flat-topped light beams, so that the light intensity of light spots in a photosensitive area is more uniform, and stray light in the process that the light beams are emitted from a laser to be removed by a light trap can be reduced at the same time.
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