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Instantaneous fixed-point diagnosis device and method of combustion flame temperature field

A technology of combustion flame and diagnostic device, applied in the direction of sensing radiation from gas/flame, electrical radiation detector, etc., can solve the problems of complex optical path measurement by spectral thermometry, and achieve high temporal and spatial resolution capability, contact area The effect of small size and wide temperature measurement range

Pending Publication Date: 2018-07-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spectral thermometry method is easily interfered by the flame background radiation and the measurement optical path is complicated. How to correctly and effectively extract the spectral information has always been the research focus of this method.

Method used

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  • Instantaneous fixed-point diagnosis device and method of combustion flame temperature field
  • Instantaneous fixed-point diagnosis device and method of combustion flame temperature field
  • Instantaneous fixed-point diagnosis device and method of combustion flame temperature field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 Shown is a schematic structural diagram of a gas temperature diagnostic device, which includes: a temperature-controlled heating furnace (1) for feeding gas, a pulsed laser (2), a focusing lens (3), and a laser energy detector probe (4) and a 3D mobile platform (5).

[0048] The pulsed laser (2) is a Nd:YAG solid-state laser used to generate pulsed lasers of specific wavelengths;

[0049] The focusing lens (3) is used to focus the laser light generated by the pulse laser on the gas to be measured to generate plasma;

[0050] The laser energy detector (4) is used to receive residual energy after focusing;

[0051] The three-dimensional mobile platform (5) is used to adjust the position of the pulse laser and the laser energy detector, thereby changing the position of the measuring point.

[0052] Further, the gas fed into the temperature-controlled heating furnace (1) may be any form of gas with a known temperature.

[0053] Specifically, for the pul...

Embodiment 2

[0061] Such as image 3 Shown is a schematic structural diagram of an instantaneous fixed-point diagnosis device for a combustion flame temperature field, said schematic diagram comprising: a flame to be measured (6), a pulsed laser (2), a focusing lens (3), a laser energy detector probe (4) and 3D mobile platform (5).

[0062] The pulsed laser (2) is a Nd:YAG solid-state laser used to generate pulsed lasers of specific wavelengths;

[0063] The focusing lens (3) is used to focus the laser light generated by the pulse laser on a specific position of the flame;

[0064] The laser energy detector (4) is used to receive the focused laser residual energy;

[0065] The three-dimensional mobile platform (5) is used to adjust the position of the pulse laser and the laser energy detector, thereby changing the position of the flame measuring point.

[0066] Further, the flame to be tested (6) may be any form of flame to be tested.

[0067] Specifically, for the pulsed laser (2), th...

Embodiment 3

[0076] A method for instantaneous fixed-point diagnosis of combustion flame temperature field, such as Figure 7 As shown, the specific steps include:

[0077] (1) Build a measurement system, use a pulsed laser to emit the required specific wavelength, and set the required laser frequency and laser energy;

[0078] (2) Adjust the focusing lens so that the pulsed laser is focused on the gas or flame measuring point of known temperature to act and generate plasma;

[0079] (3) Use the laser energy detector probe to capture and record the pulsed laser residual energy after interacting with the laser;

[0080] (4) Repeat steps (1)-(3) multiple times, record the residual energy of the pulsed laser at different temperatures, and establish the corresponding relationship between the residual energy of the laser and the temperature;

[0081] (5) Change the measurement object to the flame to be measured, repeat steps (1)-(3) to measure the pulsed laser residual energy of the flame to ...

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Abstract

The invention discloses an instantaneous fixed-point diagnosis device of a combustion flame temperature field. The device comprises a pulse laser, a focusing lens, a laser energy detector and a three-dimensional mobile platform. According to the device, laser light is focused at a flame point to be detected and breaks down the flame detection point to generate plasma; and then, the laser energy detector perpendicular to a light path is used for instantaneous acquisition of residual laser energy after focusing. A corresponding relationship between the residual laser energy and a temperature isobtained by detecting a flame or gas with the known temperature, and the instantaneous temperature diagnosis of the flame detection point to be detected is achieved. The device achieves the rapid diagnosis of the instantaneous temperature of some point in a combustion flame temperature field space.

Description

technical field [0001] The invention relates to the field of flame temperature measurement by laser diagnosis, in particular to an instantaneous fixed-point diagnosis device and method for a combustion flame temperature field. Background technique [0002] The flame temperature is an important parameter to characterize the combustion state, and the internal temperature distribution of the flame is not uniform. The accuracy of the measurement of the spatial temperature distribution of the combustion field plays an important guiding role in understanding the combustion mechanism and optimizing the combustion process. In the field of industrial applications, the design and development of power equipment such as burners also require fast and accurate flame temperature measurement. Therefore, realizing rapid measurement of flame temperature is an important issue in the field of combustion. With the rapid development of optical technology, laser diagnostic technology is increasi...

Claims

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Application Information

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IPC IPC(8): G01J5/10
CPCG01J5/0018G01J5/10
Inventor 董美蓉李诗诗陆继东骆发胜
Owner SOUTH CHINA UNIV OF TECH
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