Hollow photon crystal optical fiber-based optical fiber-connected low-pressure gas chamber device

Abstract

The invention relates to the field of optical fiber sensing and optical fiber gas trace amount detecting. In order to solve the defects that a one-way gas chamber has short absorbing distance and low probing sensitivity caused by the limit of the length of a gas pool and a long-range gas chamber has poor stability and the like because of a complicated optical structure in the gas chamber in the traditional absorption-type optical fiber gas detecting technology, the invention adopts the technical scheme that: a hollow photon crystal optical fiber-based optical fiber-connected low-pressure gas chamber device comprises two parts, i.e. a sealing gas chamber and an optical fiber connected optical path; a sealing metal gas chamber comprises two parts, i.e. a main gas chamber and a sealing cover, wherein the main gas chamber is formed by drawing a cylinder-shaped hollow core cavity from a straight metal column; the optical fiber connected optical path is made from single-mode optical fiber, photon crystal optical fiber and multi-mode optical fiber; and the hollow photon crystal optical fiber-based optical fiber-connected low-pressure gas chamber device further comprises a vacuum pump which is used for vacuumizing the main gas chamber. The hollow photon crystal optical fiber-based optical fiber-connected low-pressure gas chamber device is mainly applied to detection of the optical fiber gas trace amount.

Description

technical field [0001] The invention relates to the fields of optical fiber sensing and optical fiber gas trace detection, in particular to an optical fiber connection low-pressure gas chamber device based on a hollow-core photonic crystal optical fiber. Background technique [0002] In the spectral absorption optical fiber gas detection technology, the effective absorption distance of the gas chamber is one of the key parameters that determine the detection sensitivity of the system. Traditional air chambers are generally divided into one-way air chambers and long-distance air chambers. The single-pass gas cell is usually composed of a pair of fiber optic collimators. Since the working distance of the fiber optic collimator is generally not more than 50cm, the effective absorption distance of the gas is very short, which greatly limits the system test sensitivity. On the other hand, in order to increase the absorption distance, the one-way air chamber has a large volume an...

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Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to solve the problem that in the traditional absorption optical fiber gas detection technology, the one-way gas chamber is limited by the length of the gas pool, resulting in short absorption distance, low detection sensitivity, and long-distance gas chamber due to the gas chamber length. Disadvantages such as complex optical structure and poor stability

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