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Long-path gas detection device capable of compensating light intensity by using erbium-doped optical fiber amplifier

An erbium-doped optical fiber, gas detection technology, applied in measurement devices, color/spectral characteristic measurement, instruments, etc., can solve the problems of loss, optical path limitation, difficult to achieve, etc., achieve high detection sensitivity, long optical path, increase light the effect of

Inactive Publication Date: 2018-07-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] "Acta Optics Sinica", 2010, Volume 30, Issue 12, Pages 3655-3659, the authors are Pei Shixin, Cui Fenping, Zhang Chengyi, Li Chuanqi, and the article titled "Research on Water Vapor Detection Based on Integrating Cavity Output Spectroscopy Technology" proposes a tunable In the semiconductor laser integrating cavity output spectroscopy (TDLICOS) system, after coupling the laser light to the absorption pool, it will be reflected multiple times in the cavity, thereby obtaining a long absorption optical path, but the reflective cavity mirror of the integrating cavity in the system structure There is a loss, so the optical path is limited, and the integration cavity is very difficult to manufacture, and it is not easy to realize

Method used

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  • Long-path gas detection device capable of compensating light intensity by using erbium-doped optical fiber amplifier
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Embodiment 1

[0021] Embodiment 1 of the present invention such as figure 1 As shown, a long optical path gas detection device using an erbium-doped fiber amplifier to compensate light intensity includes a DFB laser 1, a fiber coupler a2, a gas chamber 3, a fiber coupler b4, a photodetector 5, a transimpedance amplifier 6, Data acquisition card 7, laser diode controller 8, erbium-doped fiber amplifier 9 and computer 10, it is characterized in that DFB laser 1 output end is connected to an input end of 1 × 2 fiber coupler a2 of 1:1 by optical fiber splitting ratio, The output end of the fiber coupler a2 is connected to the input end of the air chamber 3 through an optical fiber, and the output end of the air chamber 3 is connected to the input end of the 1×2 optical fiber coupler b4 with a splitting ratio of 1:99 through an optical fiber. Ratio is 99 output ends connect the input end of erbium-doped fiber amplifier 9 through optical fiber, the output end of erbium-doped fiber amplifier 9 con...

Embodiment 2

[0026] Embodiment 2 of the present invention such as figure 2 As shown, it includes single-chip microcomputer a11, adder 12, DFB laser 13, fiber coupler a14, gas chamber 15, fiber coupler b16, photodetector 17, preamplifier 18, lock-in amplifier 19, single-chip microcomputer b20, temperature control module 21. Erbium-doped fiber amplifier 22, data acquisition card 23 and computer 24. The output terminals of the single-chip microcomputer a11 and the single-chip microcomputer b20 are connected to the two input terminals of the adder 12, the output terminal of the adder 12 is connected to the DFB laser 13, the temperature control module 21 is connected to the DFB laser 13, and the output terminal of the DFB laser 13 is connected through an optical fiber with a splitting ratio of 1 : 1 input end of 1×2 fiber optic coupler a14, the output end of fiber optic coupler a14 is connected to the input end of air chamber 15 through optical fiber, and the output end of air chamber 15 is co...

Embodiment 3

[0031] Same as Embodiment 1, except that the central wavelength of the DFB laser 1 is 1544 nm, corresponding to the absorption peak of ammonia gas.

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Abstract

The invention relates to a long-path gas detection device capable of compensating light intensity by using an erbium-doped optical fiber amplifier, belonging to the field of optical fiber gas sensing.The system comprises a distributed feedback (DFB) laser, an optical fiber coupler, a gas chamber, a photoelectric detector, a trans-impedance amplifier, a data acquisition card, a laser diode controller, the erbium-doped optical fiber amplifier and a computer, wherein an output end of the DFB laser is connected with one input end of a coupler a, an output end of the coupler a is connected with aninput end of the gas chamber, an output end of the gas chamber is connected with an input end of a coupler b, one output end of the coupler b is connected with an input end of the erbium-doped optical fiber amplifier, an output end of the erbium-doped optical fiber amplifier is connected with another input end of the coupler a, another output end of the coupler b is connected with the photoelectric detector, an output end of the photoelectric detector is connected with an input end of the trans-impedance amplifier, an output end of the trans-impedance amplifier is connected with the data acquisition card, the data acquisition card is connected with the computer, and the DFB laser is controlled by means of the laser diode controller. The long-path gas detection device has the advantages ofbeing long in optical path, high in detection sensitivity, and the like.

Description

technical field [0001] The invention relates to a long optical path gas detection technology. Specifically, it is a long optical path gas detection device using an erbium-doped optical fiber amplifier to compensate light intensity. The invention belongs to the technical field of optical fiber gas sensing. Background technique [0002] Accurate and reliable measurement of gas concentrations is crucial in industrial and agricultural production. Since the cost of devices related to gas concentration detection by infrared spectroscopy is gradually reduced, and the working performance is greatly optimized, the service life is increased, and it is more stable, so infrared spectroscopy has been rapidly developed and promoted in the field of gas concentration detection. [0003] The basic working principle of gas detection by infrared spectroscopy is: different gas molecules have unique absorption lines at their specific wavelengths, and the intensity of the incident beam will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/39G01N21/01
Inventor 张秦端常军
Owner SHANDONG UNIV