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Flame detection device and method based on plif technology

A flame detection device and flame technology, applied in the field of photoelectric analysis, can solve the problems of energy distribution divergence, large loss, unfavorable detection and analysis, etc., and achieve the effect of strong strength and improved precision

Active Publication Date: 2019-05-28
HESAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There is a large loss, and the energy distribution is divergent. The light intensity per unit distance of the vertical section of the sheet light source is weak, and the excited fluorescence is weak, which is not conducive to subsequent detection and analysis.

Method used

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  • Flame detection device and method based on plif technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] figure 1 Schematically provides the structure diagram of the flame detection device based on PLIF technology of the present embodiment, as figure 1 As shown, the flame detection device includes:

[0034] laser;

[0035] A light collimating device, such as a convex lens group, the light collimating device is fixed on the optical path of the outgoing light of the laser, and collimates the outgoing light;

[0036] A coupling module 21, such as a coupling mirror, which is used to couple the collimated outgoing light into the annular reflection pool;

[0037] An annular reflecting pool 31, the annular reflecting pool is arranged on the periphery of the flame, the outgoing light is reflected multiple times in the plane in the annular reflecting pool, and passes through the flame 41 repeatedly; the reflected light is all in one plane;

[0038] A moving unit 61, which moves the annular reflecting pool and the flame relatively, such as moving the nozzle 51 that generates the ...

Embodiment 2

[0049] The flame detection device based on PLIF technology of the present embodiment is different from Embodiment 1 in that:

[0050] 1. No longer use filter devices;

[0051] 2. The central normal line of the receiving surface of the detector such as ICCD coincides with the axis of the circular reflecting pool, and the plane where the reflected light of the circular reflecting pool is located is perpendicular to the axis of the flame, which minimizes the impact of the reflected light in the circular reflecting pool on detection influence of the device.

[0052] The flame detection method based on the PLIF technology of the embodiment of the present invention, that is, the working process of the above-mentioned flame detection device, the flame detection method includes the following steps:

[0053] (A1) The outgoing light emitted by the laser is coupled into the annular reflective pool;

[0054] (A2) The outgoing light is reflected back and forth in the plane in the annular...

Embodiment 3

[0058] The flame detection device based on PLIF technology of the present embodiment is different from Embodiment 1 in that:

[0059] 1. The collimated outgoing light is coupled into the optical fiber for transmission, and the light emitted from the optical fiber is coupled into the annular reflecting pool through the coupling device, and is reflected multiple times in the reflecting pool;

[0060] 2. The central normal line of the receiving surface of the detector such as ICCD coincides with the axis of the circular reflecting pool, and the plane where the reflected light of the circular reflecting pool is located is perpendicular to the axis of the flame, which minimizes the impact of the reflected light in the circular reflecting pool on detection influence of the device.

[0061] The flame detection method based on the PLIF technology of the embodiment of the present invention, that is, the working process of the above-mentioned flame detection device, the flame detection ...

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Abstract

The invention provides a flame detection device and method based on PLIF (planar laser induced fluorescence) technology. The flame detection device comprises a laser device, a detector, an analysis module, a coupling module, an annular reflection pool and a moving unit, the coupling module is used for coupling emergent light of the laser device into the annular reflection pool, the annular reflection pool is arranged around a flame, the emergent light is reflected in a plane in the annular reflection pool for several times and repeatedly penetrates the flame, and the moving unit enables the annular reflection pool and the flame to be in relative movement and enables reflected light in the annular reflection pool to penetrate the flame at different heights. The flame detection device has the advantages of high accuracy, simple structure and low cost.

Description

technical field [0001] The invention relates to photoelectric analysis, in particular to a flame detection device and method based on PLIF technology. Background technique [0002] The free radicals produced in the combustion process are the object of great concern to combustion researchers. Through the analysis of their content and distribution, information on flame structure, combustion efficiency, reaction mechanism and many other aspects can be obtained. [0003] Planar laser-induced fluorescence (PLIF) technology has the characteristics of high sensitivity, high spatial resolution, and fast time response, and has become a free radical measurement tool. PLIF technology obtains a sheet light source through a lens group and a cylindrical mirror. The specific method is: the laser beam expands through a lens group composed of a concave lens and a convex lens, and then it is shaped into a sheet light source at the flame by a cylindrical lens and a telephoto spherical mirror. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N21/01
CPCG01N21/01G01N21/6402
Inventor 陶俊李娜向少卿孙文婷李一帆
Owner HESAI TECH CO LTD
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