Spectrum detection type gas sensor based on optical fiber Sagnac bicyclo-parallel structure

A technology of gas sensor and spectral detection, which is applied in the direction of color/spectral characteristic measurement, instrument, measuring device, etc. It can solve the problem that the sensitivity of fiber optic gas sensor needs to be improved, and achieve the effect of improving gas measurement sensitivity and high anti-interference ability

Inactive Publication Date: 2019-03-19
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

In view of the above unique advantages, it has been favored by many scientific researchers, and its status in practical applications has gradually improved, but the sensitivity of existing fiber optic gas sensors still needs to be improved

Method used

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  • Spectrum detection type gas sensor based on optical fiber Sagnac bicyclo-parallel structure
  • Spectrum detection type gas sensor based on optical fiber Sagnac bicyclo-parallel structure
  • Spectrum detection type gas sensor based on optical fiber Sagnac bicyclo-parallel structure

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Embodiment 1

[0022] Example 1: see Figure 1 to Figure 4 , the spectral detection type gas sensor based on the optical fiber Sagnac double-ring parallel structure of the present embodiment,

[0023] Includes Broad Spectrum Light Source, Isolator I, Coupler I, Coupler II, Coupler III, Coupler IV, Panda Fiber, Pump Laser, Isolator II, Circulator, Filter, Spectrometer and Polarization Maintaining Hollow Core Photonic Crystal Optical fiber; the panda fiber and coupler I constitute Sagnac interferometer I, and the polarization-maintaining hollow-core photonic crystal fiber and coupler II constitute Sagnac interferometer II;

[0024] The broadband light source, isolator I and coupler III are connected in sequence, the pump laser, isolator II and circulator are connected in sequence; the circulator, filter and spectrometer are connected in sequence; Sagnac interferometer I and Sagnac interferometer Meter II is arranged in parallel on the optical path between coupler III and coupler IV.

[0025]...

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Abstract

The invention relates to a spectrum detection type gas sensor based on an optical fiber Sagnac bicyclo-parallel structure, and belongs to the technical field of gas concentration measurement, solvingthe problem that the sensitivity of existing optical fiber gas sensors remains to be promoted. The innovation point is that: a panda optical fiber and a coupler I form a Sagnac interferometer I; a polarization-maintaining hollow-core pohotonic crystal fiber and a coupler II form a Sagnac interferometer II; a broadband optical source, an isolator I and a coupler III are connected in sequence; a pump laser, an isolator II and a circulator are connected in sequence; a circulator, a filter and a spectrograph are connected in sequence; and the Sagnac interferometer I and the Sagnac interferometer II are arranged on an optical path between the coupler III and a coupler IV in parallel connection. According to the invention, two Sagnac interferometers are in parallel connection, to generate a veriner effect, and the gas measurement sensitivity is improved by utilizing the sensibilizing characteristic of the veriner effect, so that the measurement sensitivity of the detected gas is improved by1-2 orders of magnitude.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a spectrum detection type gas sensor based on an optical fiber Sagnac double-ring parallel structure, and belongs to the technical field of gas concentration measurement. Background technique [0002] For the measurement of gas concentration, the spatial spectral absorption method is usually used for measurement. In order to improve the sensitivity, a large-volume gas chamber is required, resulting in a bulky instrument and difficult to achieve online detection. [0003] Optical fiber gas sensing technology is a rising star in gas detection technology, and it came into people's field of vision only in the 1970s. The optical fiber gas sensor has a small transmission power loss and is suitable for long-distance measurement. It has strong advantages in harsh environments such as high temperature and high pressure. It has a simple structure, high sensitivity, and is stable and reliable. In view of th...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/17G01N21/45G01N21/01
CPCG01N21/01G01N21/171G01N21/31G01N21/45G01N2021/458
Inventor 杨玉强姜久兴李林军
Owner HARBIN UNIV OF SCI & TECH
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