Spectrum detection type gas sensor based on double-optical fiber FP interferometer parallel connection structure

A gas sensor and spectral detection technology, which is used in color/spectral characteristic measurement, instruments, measurement devices, etc., can solve the problem that the sensitivity of optical fiber gas sensors needs to be improved, and achieve the effect of improving gas measurement sensitivity and high anti-interference ability.

Inactive Publication Date: 2019-03-22
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

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  • Spectrum detection type gas sensor based on double-optical fiber FP interferometer parallel connection structure
  • Spectrum detection type gas sensor based on double-optical fiber FP interferometer parallel connection structure
  • Spectrum detection type gas sensor based on double-optical fiber FP interferometer parallel connection structure

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Embodiment 1

[0024] Embodiment 1: see Figure 1 to Figure 6 , the spectral detection type gas sensor based on the dual-fiber FP interferometer parallel structure of the present embodiment,

[0025] Including broadband light source, isolator I, coupler I, coupler II, pump laser, isolator II, circulator I, circulator II, filter, spectrometer, FP interferometer I and FP interferometer II;

[0026] The broadband light source, isolator I and coupler I are connected in sequence, and the pump laser, isolator II and FP interferometer I are connected in sequence; the coupler II, filter and spectrometer are connected in sequence; circulator I and The circulator II is arranged in parallel on the optical path between the coupler I and the coupler II, the circulator I is connected to the FP interferometer I, and the circulator II is connected to the FP interferometer II.

[0027] Among them, FP Interferometer I.

[0028] The two ends of the hollow-core photonic crystal fiber (HC-PCF) with a length in...

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Abstract

The invention provides a spectrum detection type gas sensor based on a double-optical fiber FP interferometer parallel connection structure, belongs to the technical field of gas concentration measurement and solves the problem that sensitivity of the conventional optical fiber gas sensor needs to be improved. The gas sensor is characterized in that the gas sensor comprises an FP interferometer Iand an FP interferometer II; a broadband light source, an isolator I and a coupler I are connected sequentially; a pump laser, an isolator II and the FP interferometer I are connected sequentially; the coupler II, the filter and a spectrograph are connected sequentially; a circulator I and a circulator II are connected in parallel on the optical path between the coupler I and the coupler II, the circulator I is connected with the FP interferometer I, and the circulator II is connected with the FP interferometer II. The two FP interferometers are connected in parallel to produce a vernier effect, and gas measurement sensitivity is improved by a sensitivity enhancing characteristic of the vernier effect, so that the measurement sensitivity to measured gas can be increased by 1-2 orders of magnitude.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a spectral detection type gas sensor based on a double-fiber FP interferometer 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 the a...

Claims

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Application Information

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