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Femtosecond laser pumped detection system and method for measuring dynamic process of soot particles

A technology of femtosecond laser and soot particles, applied in the field of femtosecond laser pumping and detection optical system, can solve the problem that the time resolution is only on the order of nanoseconds

Inactive Publication Date: 2021-11-16
JILIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the time resolution capability of the reported soot particle dynamics measurement technology is only on the order of nanoseconds

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  • Femtosecond laser pumped detection system and method for measuring dynamic process of soot particles

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Embodiment 1

[0025] A femtosecond laser pumped detection system for measuring the dynamic process of soot particles, including a femtosecond laser amplifier 1, a beam splitter 2, a third high reflection mirror 12, a fourth high reflection mirror 13, a second optical delay line 14, a A focusing lens 15, a second focusing lens 16, a third dichroic mirror 17, a flame 18, a biconvex lens 19, a grating spectrometer 20, a signal generator 21, a computer 22, an ultraviolet femtosecond laser pulse generating unit 23; measure soot Femtosecond laser pumping detection system for particle dynamics process, including femtosecond laser amplifier 1, beam splitter 2, third high reflection mirror 12, fourth high reflection mirror 13, second optical delay line 14, first focusing lens 15. Second focusing lens 16, third dichroic mirror 17, flame 18, lenticular lens 19, grating spectrometer 20, signal generator 21, computer 22, ultraviolet femtosecond laser pulse generating unit 23;

[0026] The femtosecond la...

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Abstract

The invention discloses a femtosecond laser pumping detection optical system and a measurement method for measuring the ultrafast dynamic process of soot particles in a combustion field, belonging to the technical field of optical diagnosis of a combustion field. The invention uses a central wavelength generated by a laser amplifier system as The 800nm ​​near-infrared femtosecond laser beam is split, one beam is focused by the focusing lens to form a filament as the pump light, and the other beam passes through the ultraviolet femtosecond laser pulse generation unit to obtain a 267nm femtosecond laser pulse as the probe light, and the laser light path is adjusted to make the pump The pump light and the detection light space overlap and pass through the inside of the test combustion field; the laser, optical delay unit, camera, and computer data acquisition program run synchronously through the digital delay signal generator, and record the detection under different pump detection delay conditions The side scattering spectrum of soot particles in the combustion field of ultraviolet light; using the measured scattering spectrum, the dynamic relationship between the intensity of the scattering signal and the time delay between the pump light and the detection light is obtained, and the ultrafast dynamics of the soot particles in the combustion field are obtained. learning information.

Description

technical field [0001] The invention belongs to the technical field of optical diagnosis of a combustion field, and in particular relates to a femtosecond laser pumping detection optical system and a measurement method for measuring the ultrafast dynamic process of soot particles in a combustion field. Background technique [0002] The combustion of hydrocarbons under fuel-rich conditions will produce black smoke, which is actually the soot particles produced in the high-temperature combustion field. Today, soot particles, as an important additive material, have been widely used in important industrial production such as rubber, paint, and photosensitive materials; in addition, the soot particles generated by the combustion field are directly discharged into the air. Greenhouse effect, photochemical smog, smog and many other environmental problems are closely related to human production and life. Measuring the ultrafast kinetic process of soot particles in the combustion fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/00G01N21/53
CPCG01N15/00G01N21/53
Inventor 徐淮良臧宏伟
Owner JILIN UNIV
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