Optical system of scattering-type cloud particle detector

Abstract

The invention discloses a scattering multi-angle receiving optical system of a scattering-type cloud particle detector based on a single-mode fiber coupling output semi-conductor laser. The optical system of the scattering-type cloud particle detector comprises a transmitting optical unit, a forwards scattering detection unit and a side backward scattering detection unit and uses the single-mode fiber coupling output semi-conductor laser, an aspherical collimating mirror, a square-hole diaphragm and a 4f transformation system so as to not only generate the uniform illumination of needed laser, but also solve the diffraction problem in a beam-cutting process and improve the purity of received scattered light. The cloud particle detector of the invention has two receiving angles and can deduce the phase states of cloud particles according to a ratio of the two electric signals output at the two angles.

Description

technical field

[0001] The invention designs a cloud particle detector based on a single-mode optical fiber coupling output semiconductor laser and scattering multi-angle reception. Develop a cloud particle detector using a single-mode fiber-coupled output semiconductor laser and a square hole diaphragm. By using a square hole to cut off the edge of the Gaussian beam, only the top of the Gaussian beam remains, and use a 4f optical system to image the square hole at the center of the measurement sensitive area. , to generate an approximate flat-top beam at the center of the measurement sensitive area, to solve the problem of uneven illumination, to use a square hole diaphragm to generate a square beam, so that the time for particles to pass through the illuminated area is the same, and the time width of the electric pulse is the same, which is easy for subsequent electronic processing . The cloud particle detector invented has two scattering energy receiving systems, which rec...

Examples

Embodiment Construction

[0042] like figure 1 As shown, the present invention is a scattering cloud particle detector based on a novel optical path, which uses a single-mode optical fiber to couple and output a semiconductor laser as an illumination light source, and uses an aspheric collimator to collimate the laser light; using a square aperture diaphragm and a 4f transformation system, It not only produces the required uniform illumination of the laser light, but also solves the diffraction problem in the beam cutting process, and improves the purity of scattered light reception; when receiving scattered light, a narrow-band filter is used to improve the signal-to-noise ratio of the instrument during daytime work; The cloud particle detector invented has two receiving angles, not only can obtain the size of cloud particles, but also can infer the phase state of cloud particles according to the ratio of the scattering intensity of the two angles.

[0043] The system consists of a single-mode fiber c...

technical field

[0001] The invention designs a cloud particle detector based on a single-mode optical fiber coupling output semiconductor laser and scattering multi-angle reception. Develop a cloud particle detector using a single-mode fiber-coupled output semiconductor laser and a square hole diaphragm. By using a square hole to cut off the edge of the Gaussian beam, only the top of the Gaussian beam remains, and use a 4f optical system to image the square hole at the center of the measurement sensitive area. , to generate an approximate flat-top beam at the center of the measurement sensitive area, to solve the problem of uneven illumination, to use a square hole diaphragm to generate a square beam, so that the time for particles to pass through the illuminated area is the same, and the time width of the electric pulse is the same, which is easy for subsequent electronic processing . The cloud particle detector invented has two scattering energy receiving systems, which rec...

Examples

Embodiment Construction

[0042] like figure 1 As shown, the present invention is a scattering cloud particle detector based on a novel optical path, which uses a single-mode optical fiber to couple and output a semiconductor laser as an illumination light source, and uses an aspheric collimator to collimate the laser light; using a square aperture diaphragm and a 4f transformation system, It not only produces the required uniform illumination of the laser light, but also solves the diffraction problem in the beam cutting process, and improves the purity of scattered light reception; when receiving scattered light, a narrow-band filter is used to improve the signal-to-noise ratio of the instrument during daytime work; The cloud particle detector invented has two receiving angles, not only can obtain the size of cloud particles, but also can infer the phase state of cloud particles according to the ratio of the scattering intensity of the two angles.

[0043] The system consists of a single-mode fiber c...

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