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Device and method for synchronously or selectively exciting and measuring flame CH groups and NO molecules

A measuring device and selective technology, which are applied in the directions of measuring device, material excitation analysis, and material analysis, etc., can solve problems such as difficulty in realizing single-photon excitation, and achieve the effects of simple device, cost saving, and high detection signal-to-noise ratio.

Active Publication Date: 2019-08-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Two-photon excitation is capable of absorbing atoms or molecules (H atoms, O atoms, CO molecules) whose absorption lines are in the deep ultraviolet region, while single-photon excitation is difficult to achieve

Method used

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  • Device and method for synchronously or selectively exciting and measuring flame CH groups and NO molecules

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Experimental program
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specific Embodiment approach 1

[0029] Specific implementation mode one: as figure 1 As shown, the present invention discloses a flame CH group and NO molecule synchronous or selective excitation measurement device, including a laser 1, a focusing lens 2, a burner 3, a space calibration plate 6, a pulse signal generator 7, a computer 8, two An ICMOS camera 4 and two optical filters 5, the laser 1, the focusing lens 2 and the spatial calibration plate 6 are sequentially arranged along the transmission direction of the laser, and the spatial calibration plate 6 is arranged on the central plane of the burner 3 flame, An ICMOS camera 4 is respectively arranged on both sides of the burner 3, and the optical path from each ICMOS camera 4 to the burner 3 is the same, and the lenses of the two ICMOS cameras 4 are all set towards the flame side of the burner 3 , the focal planes of the two ICMOS cameras 4 are located on the same space focusing plate, ensuring that the collected signals originate from the same emissio...

specific Embodiment approach 2

[0030] Embodiment 2: This embodiment is a further description of Embodiment 1. The laser 1 is a linewidth-tunable laser. Satisfied that the excitation light width can be adjusted up and down the range of 1cm-1, when the excitation light width is greater than 1cm-1, the simultaneous excitation of spectral lines can be realized, and when the excitation light width is less than 1cm-1, spectral line selective excitation can be realized; if the laser has 1 line The width is not adjustable, and the excitation method can be selected according to the specific line width to meet the excitation requirements of CH groups and NO molecules.

specific Embodiment approach 3

[0031] Embodiment 3: This embodiment is a further description of Embodiment 1 or Embodiment 2. The wavelength of the laser output from the laser 1 is around 387nm, specifically 387.168nm or 387.174nm.

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Abstract

The invention relates to a device and a method for synchronously or selectively exciting and measuring flame CH groups and NO molecules, belonging to the technical field of combustion component visualization research. A laser, a focusing lens and a space calibration plate arranged at the central plane of a combustor are arranged in order, two ICMOS cameras on the same space focusing plate are arranged towards the combustor, are located at the sides of the combustor and have the same optical distance from the combustor, the cameras are provided with optical filters coaxially arranged and located at the same horizontal height, the pulse signal output end of a pulse signal generator is connected with the laser and the signal input ends of the cameras, and the signal output ends of the camerasare connected with the signal input end of the computer. The device and the method for synchronously or selectively exciting and measuring flame CH groups and NO molecules do not interfere with the flame structure of the combustion field of the combustor, the device is simple, the cost is saved, the synchronous measurement or selective measurement of CH groups and NO molecules in the combustion process is achieved, synchronous excitation or selective excitation of two groups is achieved, and therefore, the device and the method for synchronously or selectively exciting and measuring flame CHgroups and NO molecules have important significance for the combustion mechanism and the control of pollutant NO emission.

Description

technical field [0001] The invention relates to a simultaneous or selective excitation measurement device and method for flame CH groups and NO molecules, belonging to the technical field of visualization research of combustion components. Background technique [0002] NO is one of the most important pollutants produced in the combustion process. It participates in the depletion of atmospheric ozone, the formation of photochemical smog and acid rain, so the measurement of NO in the combustion process is particularly important. Intermediates produced during fuel combustion, such as CH, OH, CH 2 O, etc., these specific free radicals exist in different stages and positions of combustion, and have specific meanings. For example, CH radicals exist in the combustion reaction zone and have been frequently used to visualize the structure of the flame front. At the same time, CH radicals also participate in the formation of transient NO molecules, and are important precursors for t...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/6404
Inventor 彭江波于杨曹振马欲飞李晓晖常光高龙严彪罗邺曲天骄武国华韩明宏
Owner HARBIN INST OF TECH
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