Multi-component trace gas detection system and method based on intermediate infrared all-fiber direct absorption method
A technology of trace gas and detection system, applied in the field of laser spectrum detection and gas detection, can solve the problems of poor portability, large volume, complex structure, etc., and achieve the effect of high coincidence
Pending Publication Date: 2020-08-25
XUZHOU NORMAL UNIVERSITY
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[0006] Aiming at the problems of large volume, complex structure, and poor portability in the above-mentioned mid-infrared high-precision laser spectrum direct absorption method spectral analysis technology, the present invention provides a multi-component trace gas detection system based on mid-infrared all-fiber direct absorption method and method
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[0051] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0052] The present invention is described by taking three-channel parallel detection covering four component gases as an example. In this embodiment, since the wavelength range of the characteristic absorption spectrum of the four component gases exceeds the wavelength coverage of a single quantum cascade laser, it needs to be used in three channels consisting of three wavelength-tunable narrow-linewidth quantum cascade laser sources Infrared all-fiber direct absorption method trace gas detection system, such as Figure 1 to Figure 3 shown, including:
[0053] Mid-infrared quantum cascade laser I1, mid-infrared quantum cascade laser II1', mid-infrared quantum cascade laser III1", the first mid-infrared single-mode fiber I2, the first mid-infrared single-mode fiber II2', the first mid-infrared single-mode fiber Mode optical f...
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Abstract
The invention discloses a multi-component trace gas detection system and method based on an intermediate infrared all-fiber direct absorption method. The wavelength-tunable narrow-linewidth quantum cascade laser serves as a light source. The laser output is coupled into a first intermediate infrared single-mode optical fiber; one section of the intermediate infrared hollow-core optical fiber serves as an air chamber, ventilation micropores are drilled in the two ends of the intermediate infrared hollow-core optical fiber in the lateral direction so that detected gas can pass through the ventilation micropores, and laser is output through the first intermediate infrared single-mode optical fiber to enter the intermediate infrared hollow-core optical fiber air chamber, then coupled to enterthe second intermediate infrared single-mode optical fiber and then coupled to enter the photoelectric probe. And the two sections of mid-infrared single-mode optical fibers and the mid-infrared hollow-core optical fiber air chamber form an all-fiber structure through low-loss welding. Multi-channel and multi-wavelength parallel air chamber detection is realized through a scheme of sharing a micro-box by multiple channels; the system is high in sensitivity, anti-interference, simple in optical path, compact in structure, small in size, easy to carry and high in expansibility, and multi-channel, multi-component and multi-wavelength rapid detection can be achieved.
Description
technical field [0001] The invention relates to a multi-component trace gas detection device and method, in particular to a multi-component trace gas detection system and method based on a mid-infrared all-fiber direct absorption method, which belongs to the technical field of laser spectrum detection and gas detection . Background technique [0002] The mid-infrared 3-14 micron band has important practical value. The fingerprint fundamental vibration absorption lines of life-related carbon, hydrogen, oxygen, nitrogen-containing gas molecules and volatile organic compounds all fall in this band, so the mid-infrared Spectroscopy technology can perform simultaneous online, fast and accurate qualitative and quantitative analysis of multi-component trace gases, which has important requirements in many application scenarios such as environmental monitoring, industrial production process monitoring, toxic and explosive gas detection, and disease diagnosis. [0003] The direct abs...
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IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 冯宪施进丹
Owner XUZHOU NORMAL UNIVERSITY