Fiber gas sensor based on Fourier transform spectrometry

A Fourier transform, gas sensor technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of lack of versatility, light source wavelength drift, measurement accuracy reduction, etc., to achieve large light energy output, large radiation flux, The effect of high sensitivity and signal-to-noise ratio

Inactive Publication Date: 2010-05-19
JIANGSU LANLING ELECTROMECHANICAL TECH CO LTD +1
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Problems solved by technology

Therefore, the stability of the wavelength of the light source has an important impact on the measurement performance, and it is not universal
In actual situations, due to

Method used

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  • Fiber gas sensor based on Fourier transform spectrometry
  • Fiber gas sensor based on Fourier transform spectrometry
  • Fiber gas sensor based on Fourier transform spectrometry

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Embodiment Construction

[0029] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0030] The structure diagram of the optical fiber gas sensor based on Fourier transform spectroscopy designed by the present invention is as follows figure 1 As shown, it includes: broadband light source 1 , fiber beam splitter 2 , fiber circulators 3 and 4 , sensor head 5 , standard single-mode fiber 7 , spatially high-resolution array photodetector 9 , and signal processing system 10 .

[0031] The broadband light source 1 has a wavelength of 0.4-1.1 μm, the photodetector 9 is a high-resolution linear array CCD detector, and all connected optical fibers are single-mode optical fibers.

[0032] The sensor head 5 includes two parallel gas chambers 6, the length of which is 30 cm. One end of the air chamber 6 fixes the self-focus lens 11 , and the other end of the air chamber 6 is a total reflection prism 12 placed parallel to the end face of the self-focus lens ...

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Abstract

The invention relates to a fiber gas sensor based on Fourier transform spectrometry, which is characterized in that a light source is connected with a fiber polarization splitter by a single mode fiber, and the single mode fiber led out from the fiber polarization splitter is respectively connected with the first ports of two same fiber circulators; the second ports of two fiber circulators are connected with two input ends of a sensing head via the single mode fiber; the third ports of two fiber circulators are connected with two single mode fibers with the same length; the receiving surface of the photoelectric detector is parallel to the plane formed by two output ends; and the output end of the photoelectric detector is connected with a signal processing system. By adopting a broad band light source, the invention can obtain bigger radiant flux, simultaneously records all spectrum components, has larger luminous energy output as well as bigger sensitivity and signal-to-noise ratio, lowers requirements to the light source and does not need to know the specific components and absorption peak position of gas to be measured, thus the fiber gas sensor has higher popularity.

Description

technical field [0001] The invention relates to a fiber optic gas sensor based on Fourier transform spectroscopy and the technical field of fiber optic gas sensors. Background technique [0002] Optical fiber gas sensing technology is a new type of gas detection technology. Optical fibers have unique light guiding characteristics, so sensors made of optical fibers have a series of advantages that traditional sensors cannot match. Optical fiber has the advantages of low transmission loss, small diameter, light weight, bendable, corrosion resistance, and anti-electromagnetic interference, so the optical fiber sensor can be placed in harsh or dangerous places such as high temperature, humidity, strong noise, flammable, explosive, toxic, etc. In the environment of the environment, the sensing signal is led out by optical fiber, and the long-distance online remote control measurement is carried out in a safe area. In addition, fiber optic sensors also have the characteristics o...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 赵建林李鹏
Owner JIANGSU LANLING ELECTROMECHANICAL TECH CO LTD
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