Device which is invented based optical trapping of particles in aerosol and is used for realizing Raman spectrum detection

A technology of Raman spectrum detection and optical trapping, which is applied in the fields of optical tweezers, spectral analysis and detection of tiny particles, which can solve the problems of lack of key spectral features and obstacles to correct identification

Inactive Publication Date: 2018-11-30
CHINA JILIANG UNIV
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Problems solved by technology

But when the excitation light source is in the visible light band, such as 488nm, 633nm and 780nm, many biological particles (pollen, fungal spores, etc.) will have one or more fluorescent packets in a larg

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  • Device which is invented based optical trapping of particles in aerosol and is used for realizing Raman spectrum detection
  • Device which is invented based optical trapping of particles in aerosol and is used for realizing Raman spectrum detection
  • Device which is invented based optical trapping of particles in aerosol and is used for realizing Raman spectrum detection

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specific Embodiment

[0031] A specific embodiment of the present invention is as follows:

[0032] The first laser 1 produces laser light with a wavelength of 488nm and a power of 1000mW. After passing through the first reflector 3, the laser light passes through the first mirror 3 and then propagates upward at an angle of 10° to the horizontal direction, and then passes through the first half mirror 4 and is divided It is two solid laser beams with the same energy, one of which passes through the first convex lens 5 and the first complementary conical lens group 6 to produce a hollow laser beam I with a diameter of 15 mm, and the other laser passes through the second mirror 18 in sequence , the third reflector 19, the fourth reflector 20, the second convex lens 21 and the second complementary conical lens group 22 to produce a hollow laser beam II with the same energy as the hollow laser beam I as a 15mm hollow laser beam, the two hollow laser beams The power is 500mW.

[0033] The first microsc...

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Abstract

The invention discloses a device which is invented based optical trapping of particles in aerosol and is used for realizing Raman spectrum detection. The device comprises two lasers, a hollow laser beam generation mechanism, an aerosol particle optical trapping mechanism, and a Raman spectrum detection mechanism; the hollow laser beam generation mechanism is used for diving laser generated by a first laser into two conical hollow laser beams; the two conical hollow laser beams are focused in an aerosol flow channel of a quartz chamber of the aerosol particle optical trapping mechanism to construct a capsule structure optical trapping trap composed of the two conical hollow laser beams, and realizing optical trapping on aerosol particles; the Raman spectrum detection mechanism is adopted for real-time spectrum detection of trapped particles. The device can be used for stable optical trapping and Raman spectrum detection of aerosol particles, eliminating fluorescence background in particle Raman signals, is rapid and nondestructive, and is capable of realizing identification of particles in aerosol.

Description

technical field [0001] The invention relates to the fields of optical tweezers, spectral analysis and microparticle detection, in particular to a device for optically trapping particles in aerosol and realizing Raman spectrum detection. Background technique [0002] Aerosol is a suspension system formed by suspending liquid or solid particles in a gas medium, in which the characteristic particle size of the particle phase is generally 1 nm to 100 μm. When the concentration of particles such as soot and infectious bacteria in the atmosphere exceeds a certain threshold, the aerosol will have a vital impact on air quality, climate change, and human health. Therefore, the detection of particles in atmospheric aerosols It has become an important part of environmental detection. [0003] The optical detection of aerosol particles can obtain the material characteristics of the particles. When combined with other features such as the shape or surface structure of the particles, mor...

Claims

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Application Information

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IPC IPC(8): G01N15/00G01N15/06
CPCG01N15/00G01N15/06G01N15/0606G01N2015/0693
Inventor 刘开元金怀洲金尚忠胡孔新杨宇王杰徐冰冰朱磊磊
Owner CHINA JILIANG UNIV
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