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Calibration method and device based on laser induced plasma spectroscopy and method and device for measuring equivalent ratio of combustible gas to oxidant

A plasma spectroscopy and laser-induced technology, applied in the field of methods and devices, can solve the problems of difficult realization, complicated and expensive equipment, laser wavelength limitation, etc., and achieve the effects of low cost, simple signal processing, and high signal-to-noise ratio.

Inactive Publication Date: 2012-10-03
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The laser-induced fluorescence method has strict restrictions on the laser wavelength, and the equipment is complicated and expensive, so it is difficult to realize

Method used

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  • Calibration method and device based on laser induced plasma spectroscopy and method and device for measuring equivalent ratio of combustible gas to oxidant
  • Calibration method and device based on laser induced plasma spectroscopy and method and device for measuring equivalent ratio of combustible gas to oxidant
  • Calibration method and device based on laser induced plasma spectroscopy and method and device for measuring equivalent ratio of combustible gas to oxidant

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specific Embodiment approach 1

[0032] The specific embodiment one, based on the calibration method of laser-induced plasma spectrum, it is realized by the following steps:

[0033] Step A, passing combustible gas, oxygen and nitrogen into the gas mixing tank to form a mixed gas, and controlling the flow of combustible gas, oxygen and nitrogen respectively;

[0034] Step B, passing the mixed gas formed in step A into the quartz glass round tube, and allowing the mixed gas to flow out from the nozzle of the quartz glass round tube;

[0035] Step C, using a laser to emit a laser beam, and focusing the laser beam to the position of the nozzle in step B, breaking through the mixed gas flowing out of the nozzle to generate plasma, and the plasma emits a fluorescent signal;

[0036] Step D, focusing the fluorescent signal emitted by the plasma in step C to the entrance of the optical fiber with a focusing lens, and the optical fiber transmits the incident optical signal at the entrance to the spectrometer; using a...

specific Embodiment approach 2

[0044] Specific embodiment two, realize the calibration device based on the laser-induced plasma spectrum of specific embodiment one, it comprises fuel gas bottle 1, oxygen gas bottle 2, nitrogen gas bottle 3, No. 1 flow meter 41, No. 2 flow meter 42 , No. 3 flow meter 43, gas mixing tank 5, quartz glass circular tube 6, No. 1 laser device 71, No. 1 focusing lens 81, No. 2 focusing lens 82, No. 1 optical fiber 91, No. 1 spectrometer 101 and No. 1 computer 111;

[0045] Fuel gas cylinder 1 is charged with combustible gas, oxygen gas cylinder 2 is filled with oxygen, and nitrogen gas cylinder 3 is filled with nitrogen; the gas outlet of fuel gas cylinder 1, the gas outlet of oxygen gas cylinder 2 and nitrogen gas cylinder 3 The gas outlets of the gas outlets are respectively communicated with the three air inlets of the gas mixing tank 5; the No. 1 flowmeter 41, the No. 2 flowmeter 42 and the No. 3 flowmeter 43 are arranged on the gas outlet of the fuel gas cylinder 1 and the ox...

specific Embodiment approach 3

[0047] Specific embodiment three, based on the method for measuring the equivalent ratio of combustible gas and oxidant based on laser-induced plasma spectroscopy in specific embodiment one, it is realized by the following steps:

[0048] Step 1, using a laser to emit a laser beam, focusing the laser beam into the target burner, breaking through the combustible gas and oxidant to be measured in the target burner, and generating plasma; the plasma emits a fluorescent signal;

[0049] Step 2. Focus the fluorescent signal emitted by the plasma in step 1 into the optical fiber with a focusing lens, and transmit it to the spectrometer through the optical fiber, and use a computer to analyze the fluorescent signal collected by the spectrometer to obtain the plasma spectrum of the combustible gas and oxidant to be measured;

[0050] Step 3. Obtain the H characteristic peaks and O characteristic peaks in the plasma spectrum of the combustible gas and oxidant to be measured in step 2, c...

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Abstract

The invention relates to a calibration method and a calibration device and a method and a device for measuring equivalent ratio of combustible gas to oxidant, in particular to a calibration method and a calibration device based on laser induced plasma spectroscopy and a method and a device for measuring equivalent ratio of combustible gas to oxidant, aiming at improving the calibration accuracy of the existing calibration method, improving the measuring accuracy of the equivalent ratio of fuel to oxidant in the existing combustion system and improving the convenience in measurement of equivalent ratio of mixed fuel gas. Since plasma fluorescence signal intensity is high, the signal-to-noise ratio is high and the response sensitivity of an ICCD (intensified charge coupled device) which is used as light signal receiving equipment in a spectrograph is high, the measuring accuracy of the method provided by the invention is higher than the measuring accuracy of other existing equivalent ratio measuring method. Since the method is a non-contact measuring method, laser beam and fluorescence signal receiving equipment are not limited by spatial positions and the signals are convenient and rapid to process at a later stage, the method can satisfy the requirement on real-time online measurement. The technical scheme is suitable for the calibration method and the calibration device based on laser induced plasma spectroscopy and the measurement of equivalent ratio of combustible gas to oxidant.

Description

technical field [0001] The invention relates to a calibration method and device, and a method and device for measuring the equivalent ratio of combustible gas and oxidant. Background technique [0002] The equivalence ratio refers to the ratio of the amount of oxidant actually supplied in the combustion system to the amount of oxidant required for complete combustion of the fuel. The equivalence ratio of fuel and oxidant is a very important parameter in the field of combustion, which can reflect the mixture of fuel and oxidant. In the actual diffusion flame, the equivalence ratio at different positions is different, so it is difficult to judge the equivalence ratio of each point. However, only when the equivalence ratio is appropriate can full combustion be guaranteed. Therefore, the accurate measurement of equivalence ratio is of great significance to the development of combustion technology. [0003] In actual combustion systems, such as aerospace engines, internal combu...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 于欣彭江波贾博阳李晓晖樊荣伟赵永蓬陈德应孙锐杨晓川韩于朝杨振于杨
Owner HARBIN INST OF TECH
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