System and method for measuring oxygen concentration based on ultraviolet broadband secondary absorption spectrum

A technology of oxygen concentration and secondary absorption, which is applied in the direction of color/spectral characteristic measurement, measuring device, and material analysis through optical means. It can solve the problems of large error, high cost, and poor stability, and achieve low cost and high absorption cross section. Larger, less demanding effects

Active Publication Date: 2017-08-15
黑龙江省工研院资产经营管理有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor stability, large error and high cost when oxygen sensor technology measures oxygen concentration, and at the same time avoid the detection of vacuum ultraviolet band, and propose an oxygen concentration measurement based on ultraviolet broadband secondary absorption spectrum System and Measurement Method

Method used

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  • System and method for measuring oxygen concentration based on ultraviolet broadband secondary absorption spectrum
  • System and method for measuring oxygen concentration based on ultraviolet broadband secondary absorption spectrum
  • System and method for measuring oxygen concentration based on ultraviolet broadband secondary absorption spectrum

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specific Embodiment approach 1

[0030] Specific implementation mode one: combine figure 1 Describe this embodiment, an oxygen concentration measurement system based on ultraviolet broadband secondary absorption spectrum described in this embodiment, the system includes a deuterium lamp 1, a first lens 2, a first filter lens 3, a gas cell 4, a second A filter lens 5, a second lens 6, a grating spectrometer 7, a photomultiplier tube 8 and data acquisition 9;

[0031] The ultraviolet broadband light emitted by the deuterium lamp 1 is injected into the gas cell 4 through the first lens 2 and the first filter lens 3, and the outgoing light of the gas cell 4 passes through the second filter lens 5 and the second lens 6, Enter the incident slit of the grating spectrometer 7; the first lens 2 is used to collimate the ultraviolet broadband light into parallel light, the second lens 6 is used to converge the transmitted light, and the second filter lens 5 is used to filter out the vacuum ultraviolet light , the first...

specific Embodiment approach 2

[0037] Specific embodiment 2: This embodiment further defines the oxygen concentration measurement system based on ultraviolet broadband secondary absorption spectrum described in specific embodiment 1. In this embodiment, the first lens 2 and the second lens 6 are quartz convex lenses, and the ultraviolet transmittance of the quartz convex lens is relatively high, and the first lens 2 can effectively convert ultraviolet broadband light into parallel light, and the second lens 6 can effectively convert transmitted light into converging light;

[0038]The initial transmission wavelength of the first filter lens 3 and the second filter lens 5 is greater than 220nm, and the first filter lens 3 and the second filter lens 5 both play the role of filtering;

[0039] In this embodiment, the first filter lens 3 and the second filter lens 5 can be realized by using common glass sheets.

specific Embodiment approach 3

[0040] Specific implementation mode three: combination figure 2 Describe this embodiment, this embodiment is to further limit the oxygen concentration measurement system based on the ultraviolet broadband secondary absorption spectrum described in the second specific embodiment, in this embodiment, the gas cell 4 is provided with an incident window, Exit windows, gas inlets and gas outlets;

[0041] The gas cell 4 is a cylindrical gas cell, the incident window and the exit window are respectively located on the two end faces of the cylindrical gas cell, and the gas inlet and the gas outlet are respectively located on the two end side walls of the cylindrical gas cell; the cylindrical gas cell can accelerate The gas exchange speed; the gas inlet and the gas outlet are respectively located on the side walls of the two ends of the cylindrical gas pool, which can reduce the dead angle in the gas pool and make the gas exchange effect in the gas pool better. At the same time, in or...

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Abstract

The invention provides a system and method for measuring the oxygen concentration based on an ultraviolet broadband secondary absorption spectrum and relates to a gas concentration detection device and method. According to the device and the method, the problems of poor stability, big errors, difficulty in maintenance, high cost and low sensitivity when the oxygen concentration is determined by virtue of an oxygen sensor technique are solved. According to the method, the ultraviolet broadband light emitted by a deuterium lamp is aligned by a first lens and a first light filter piece and is emitted into a gas pool, the spectrum strength of parallel light is reduced due to the absorption of to-be-determined oxygen, and then transmission light is produced; the transmission light is converged by a second light filter piece and a second lens and is emitted into an entrance slit of a grating spectrometer, and the convergence light is converted into data signals by the grating spectrometer and is amplified by virtue of a photomultiplier tube; and the amplified data signals are subjected to data processing by virtue of a computer, and the concentration of to-be-determined oxygen is obtained. The system and the method have the beneficial effects that the determinacy is good, the measurement error is small, and the cost is low. The system and the method are applicable to the monitoring of oxygen and ambient atmosphere in industrial processes.

Description

technical field [0001] The invention relates to a gas concentration detection device and method. Background technique [0002] Oxygen O 2 It is not only an important component of the atmosphere, but also an important gas in industrial production processes and medical instruments. Monitoring the concentration of oxygen plays an important role in environmental monitoring and industrial process control. Oxygen is a combustion-supporting gas. In the process of industrial production, real-time and accurate online monitoring and feedback of oxygen concentration, and control according to requirements is one of the important means of energy saving and emission reduction. At the same time, in metal smelting, oxygen-free welding and other industries, trace oxygen detection and monitoring can ensure the smooth progress of industrial production and the safety of operators. Therefore, whether it is environmental monitoring or industrial production process control, there is a great need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/33
CPCG01N21/01G01N21/33
Inventor 张治国王琳龚英华
Owner 黑龙江省工研院资产经营管理有限公司
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