Device and method for detection of particulate matter distribution in flames by strong field laser

A technology of laser detection and inner particles, which is applied in measuring devices, particle and sedimentation analysis, particle size analysis, etc., can solve the problems of light absorption loss and achieve low loss effect

Inactive Publication Date: 2018-04-20
JILIN UNIV
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Problems solved by technology

However, since the intermediate products of the combustion field will absorb photons in this wavelength range, this method of externally injecting pump light will cause serious optical absorption loss problems.

Method used

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  • Device and method for detection of particulate matter distribution in flames by strong field laser
  • Device and method for detection of particulate matter distribution in flames by strong field laser
  • Device and method for detection of particulate matter distribution in flames by strong field laser

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Embodiment 1

[0034] The invention provides a device for detecting the distribution of particles in a flame by using a strong-field laser, including a femtosecond laser amplifier 1, a half-wave plate I2, a polarizer 3, a dielectric film high reflection mirror 4, and a half-wave plate Ⅱ5, plano-convex lens 6, alcohol lamp 7, three-dimensional precision displacement platform 8, double-convex lens 9 and a grating spectrometer 10 equipped with an enhanced charge-coupled device; wherein, the laser output from the femtosecond laser amplifier 1 passes through one-half of the vertically placed After a wave plate I2, a polarizer 3, a dielectric film high reflection mirror 4, a half-wave plate II5 and a plano-convex lens 6, a femtosecond laser filament is formed behind the plano-convex lens 6; a three-dimensional precision displacement platform 8 is placed on the plano-convex lens 6, the alcohol lamp 7 is placed on the three-dimensional precision displacement platform 8, and the three-dimensional dire...

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Abstract

Belonging to the technical field of ultrafast laser sensing, the invention discloses a device and method for detection of particulate matter distribution in flames by strong field laser. The high strength characteristics of a femtosecond filament nuclear zone in a combustion field can produce nonlinear frequency conversion for in-situ generation of third harmonic with spectrum located in an ultraviolet region. Particulate matters scatter the third harmonic in the combustion field, and the distribution information of particulate matters in the combustion field can be obtained through the strength of laterally collected scattered signals. The light scattering technology of generating third harmonic as a pumping source based on ultrafast laser filamentation in the combustion field can be applied to the field of remote in-situ monitoring of particulate matters in a combustion environment. The device and method provided by the invention have the outstanding advantages of remote detection and low loss, and are very suitable for analysis of particulate matters in a complex combustion environment like high temperature and high pressure combustion field.

Description

technical field [0001] The invention belongs to the technical field of ultrafast laser sensing, and in particular relates to a device and method for remotely and in-situ detecting the distribution of particles in flames by using strong-field lasers to form filaments in a combustion field to generate third harmonics. Background technique [0002] At present, in my country's energy structure, although energy types are gradually diversifying, non-renewable fossil energy still occupies the largest proportion. Fossil energy will produce particulate matter during the combustion process, including nano-particles with a small size (1-5nm) and soot particles with a large size (10-100nm). If the combustion is not complete, these particles will be directly emitted into the atmosphere , thus causing serious pollution to the environment and threatening ecological security. Studies have shown that the particulate matter produced by combustion is one of the "culprits" for frequent occurre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
CPCG01N15/0211
Inventor 徐淮良臧宏伟李贺龙
Owner JILIN UNIV
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