Gas sensor based on photothermal spectroscopy and Sagnac interference

A gas sensor and spectroscopy technology, which is applied in the field of gas sensors based on photothermal spectroscopy and Sagnac interference, can solve the problems of bulky instruments and difficult to achieve online detection, and achieves the solution of magnetic hysteresis loops, miniaturization, and realization of The effect of long-distance absorption and online detection

Pending Publication Date: 2018-03-20
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0002] For the measurement of gas concentration, the spatial spectral absorption method is usually used for measurement. In order to imp

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  • Gas sensor based on photothermal spectroscopy and Sagnac interference
  • Gas sensor based on photothermal spectroscopy and Sagnac interference
  • Gas sensor based on photothermal spectroscopy and Sagnac interference

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Embodiment Construction

[0023] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Moreover, it should also be understood that development work, while potentially complex and time-consuming, would at least be a routine undertaking for those skilled in the art having the benefit of this disclosure.

[0024] Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and processing steps closely related to the sol...

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Abstract

The present invention provides a gas sensor and a method for detecting change in gas concentration. The gas sensor includes a first laser, a first isolator, a coupler, a Sagnac ring, a circulator, a second isolator, a second laser, a filter and a photodetector; the Sagnac ring comprises a hollow-core photonic crystal fiber, part of pores in a cladding layer are filled with alcohol, and a hollow core is filled with a to-be-measured gas; the output wavelength of the second laser is coincident with the absorption spectrum peak of the to-be-measured gas, pump light outputted by the second laser passes through the isolator and the circulator, enters the hollow core fiber to interact with the to-be-measured gas in a hollow-core fiber core; the output wavelength of the first laser is coincident with the absorption spectrum trough of the to-be-measured gas, narrowband signal light outputted from the first laser passes through the first isolator and the coupler, enters the Sagnac ring, the circulator and the filter in turn, and is accepted by the photodetector. By measuring of the change in the light intensity of the signal light, that is, the change amount of voltage, the change in the concentration of the to-be-measured gas is finally obtained.

Description

technical field [0001] This patent relates to fiber optic gas sensing technology, in particular to a gas sensor based on photothermal spectroscopy and Sagnac interference. 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 above unique advantages, it has been favored by many scientific researchers,...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/23
CPCG01N21/31G01N21/23
Inventor 杨玉强王永光赵玉欣
Owner HARBIN UNIV OF SCI & TECH
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