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Portable difference absorption spectrum method and apparatus

A differential absorption spectroscopy, portable technology, applied in the field of portable differential absorption spectroscopy, can solve the problems of inconvenient installation, large differential absorption spectroscopy system, etc.

Inactive Publication Date: 2007-11-07
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a portable differential absorption spectroscopy method and device in order to solve the problem that the existing differential absorption spectroscopy system is too large and inconvenient to install

Method used

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  • Portable difference absorption spectrum method and apparatus

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] The laser beam emitted by the laser light source 1 passes through the sample cell 3 through the lens 2 and at the same time passes standard gas into the sample cell 3, passes through the nitrogen-filled multi-reflection cell for multiple reflections, and then passes through the lens 5 to converge and optical fiber After the function of the coupler 6 is introduced into the spectrometer 8 through the optical fiber 7 to complete the conversion of the spectrum signal, and finally sent to the computer 11 for processing, the main control circuit board 9 of the device is to complete the detector control, acquisition control, etc., and the timing generation board 10 is the detection The device provides the necessary timing signals, and this step is the preliminary zero calibration.

[0014] After zero calibration, remove the sample cell 3, and then fill the multi-reflection...

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Abstract

The invention discloses a portable differential spectrum absorbing method and device, where to-be-tested gas is charged in a multiple reflecting tank, the light emitted from a light source is gathered by lens to enter the multiple reflecting bank to be reflected many times in the multiple reflecting bank and then be led through optical fiber into a spectrum meter by the actions of lens and optical fiber coupler, and then the spectrum meter makes spectrum signal conversion, and finally transmits the converted signal to a computer. And the invention replaces open light path with multiple reflecting bank to complete monitoring polluted gas in atmosphere without telescope and angle reflector.

Description

Technical field [0001] The invention relates to the field of environmental protection, in particular to a portable differential absorption spectroscopy method and device Background technique [0002] Differential absorption spectroscopy (DOAS) technology is a method that uses the characteristic absorption spectra of various gas molecules in the ultraviolet and visible bands to retrieve their concentration in the atmosphere when light is transmitted in the atmosphere. The differential absorption spectrometer is based on this technology. Atmospheric trace gas monitoring device. [0003] The complete set of differential absorption spectrometer equipment mainly includes: light source, telescope system integrated with transmitting and receiving, corner reflector, quartz fiber, monochromator, PDA detector, data acquisition system and computer. The working process of the instrument is: the light emitted by the xenon lamp is collimated from the outer part of the main mirror into parallel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/27
CPCG01N21/031G01N21/31
Inventor 司福祺谢品华肖雪窦科刘文清
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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