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Apparatus for simultaneously monitoring concentration of carbon monoxide and carbon dioxide

A carbon dioxide and carbon monoxide technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of sensitivity to working temperature changes and high cost of single-mode diode lasers, achieve a large wavelength range, improve reliability and stability, and have good stability Effect

Inactive Publication Date: 2009-08-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of high cost of using single-mode diode lasers in existing spectroscopic gas detection devices, and the problem that the output wavelength is sensitive to changes in operating temperature, and provides a device that can simultaneously monitor carbon monoxide and carbon monoxide using tunable multi-mode diode lasers. Carbon Dioxide Concentration Device

Method used

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  • Apparatus for simultaneously monitoring concentration of carbon monoxide and carbon dioxide
  • Apparatus for simultaneously monitoring concentration of carbon monoxide and carbon dioxide
  • Apparatus for simultaneously monitoring concentration of carbon monoxide and carbon dioxide

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specific Embodiment approach 1

[0009] Specific implementation mode one: the following combination figure 1 Describe this embodiment, this embodiment consists of a sawtooth wave generator 1, a sine wave generator 2, a power divider 3, a current controller 4, a temperature controller 5, a tunable multimode diode laser 6, a collimating lens 7, a first A beam splitter 8, a first gas cell 9, a first focusing lens 10, a first photodetector 11, a second beam splitter 12, a second gas cell 13, a second focusing lens 14, a second photodetector 15, a reflector mirror 16, the third gas pool 17, the third focusing lens 18, the third photodetector 19, data acquisition card 20 and computer 21, the output ends of the sawtooth wave generator 1 and the sine wave generator 2 are respectively connected to the power splitter 3, the output of the power divider 3 is connected to the input of the current controller 4, the output of the current controller 4 and the temperature controller 5 are respectively connected to an input of...

specific Embodiment approach 2

[0014] Embodiment 2: This embodiment differs from Embodiment 1 in that the central wavelength of the tunable multimode diode laser 6 is 1572±2 nm. Other composition and connection methods are the same as those in Embodiment 1.

specific Embodiment approach 3

[0015] Specific implementation mode three: the following combination figure 2 , image 3 , Figure 4and Figure 5 This embodiment is described. The difference between this embodiment and Embodiment 1 is that the first gas pool 9, the second gas pool 13 and the third gas pool 17 are respectively composed of a round tube 24, a gas nozzle 22 and a glass plate 23. Both ends of the tube 24 are glued with glass plates 23, and the tube wall of the round tube 24 communicates with two gas nozzles 22. Other composition and connection methods are the same as those in Embodiment 1. There are two gas nozzles at both ends of the cell body, one as the air inlet and the other as the gas outlet, which can ensure the effectiveness of gas replacement in the gas cell and meet the requirements of real-time measurement.

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Abstract

The invention discloses a device for synchronously monitoring the concentration of carbon oxide and carbon dioxide, which belongs to the technical field of gas concentration detection. The invention aims to solve the problems that the prior spectroscopy gas detection has high cost due to using a single-mode diode laser and the output wavelength is sensitive to the change of working temperature. Output ends of a sawtooth generator and a sine wave generator of the device are connected with an input end of a power divider respectively; an output end of the power divider is connected with an input end of a current controller; output ends of the current controller and a temperature controller are connected with an input end of a tunable multimode diode laser respectively; output light of the tunable multimode diode laser is incident into a collimating lens, transmitted light which passes through the collimating lens is orderly incident onto three branches formed by spectroscopes, gas cells, focusing lenses and photoelectric detectors; and output ends of the photoelectric detectors are connected to a data acquisition card respectively, and then the data acquisition card is connected with a computer through a PCI slot. The device is used for monitoring the concentration of the carbon oxide and the carbon dioxide.

Description

technical field [0001] The invention relates to a device for simultaneously monitoring the concentrations of carbon monoxide and carbon dioxide, belonging to the technical field of gas concentration detection. Background technique [0002] The current gas detection methods are mainly divided into chemical and spectroscopic methods. Compared with chemical detection methods, spectroscopic technology has the advantages of non-contact, long-distance, and fast response. Among the spectroscopy methods, Tunable Diode Laser Spectroscopy (TDLAS) uses a small size, low energy consumption, and easy-to-tunable diode laser as a light source, which has the advantages of high sensitivity, high selectivity, fast response, online, energy saving, and integration. . More importantly, the detection of various gases can be realized by tuning the diode laser to scan the position of different absorption lines, which further improves the integration and miniaturization of the system. However, th...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 娄秀涛张治国高宝烈·萨姆斯菲林陈斌
Owner HARBIN INST OF TECH
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