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Femtosecond laser pump detecting optical system for measuring dynamic process of soot particles and method thereof

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: 2019-07-02
JILIN UNIV
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  • Abstract
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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 pump detecting optical system for measuring dynamic process of soot particles and method thereof
  • Femtosecond laser pump detecting optical system for measuring dynamic process of soot particles and method thereof
  • Femtosecond laser pump detecting optical system for measuring dynamic process of soot particles and method thereof

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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 and 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 femtosecon...

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Abstract

The invention, which belongs to the technical field of optical diagnosis of the combustion field, discloses a femtosecond laser pump detecting optical system for measuring the ultrafast dynamic process of soot particles in a combustion field and a measuring method thereof. Near-infrared femtosecond laser with the center wavelength of 800nm is split, wherein the laser is generated by a laser amplifier system; one beam of laser is focused by a focusing lens to form a light filament as pump light and the other beam of laser passes through an ultraviolet femtosecond laser pulse generating unit toobtain a 267nm femtosecond laser pulse as detection light; and the laser light path is adjusted to enable pump light and detection light to be overlapped in space and light to pass through the insideof the combustion field. With a digital delay signal generator, a laser, an optical delay unit, a camera, and a computer data acquisition program work synchronously and lateral scattering spectrums ofsoot particles under detection ultraviolet light in the combustion field are recorded under different pump detection delay conditions; and on the basis of the measured lateral scattering spectrums, adynamic changing relationship of the scattered signal intensity with pump light and detection light time delays is obtained, so that ultra-fast dynamic information of the soot particles in the combustion field is obtained.

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 Applications(China)
IPC IPC(8): G01N15/00G01N21/53
CPCG01N15/00G01N21/53
Inventor 徐淮良臧宏伟
Owner JILIN UNIV
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