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Spectral absorption type air-surveying air chamber and method for improving air diffusion speed

A technology of gas measurement and spectral absorption, which is applied in the direction of color/spectral characteristic measurement, measuring devices, and material analysis through optical means, and can solve problems such as large impact, difficult debugging, and large environmental impact

Inactive Publication Date: 2009-09-16
XI AN JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The multi-reflection gas chamber has a long gas absorption path and high system sensitivity, but the coupling efficiency of the multi-reflection gas chamber is low and the transmission loss is large
At the same time, its structure is complex, debugging is difficult, and it is greatly affected by the environment (the longer the optical path, the greater the degree of influence), the practical application is more difficult

Method used

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  • Spectral absorption type air-surveying air chamber and method for improving air diffusion speed
  • Spectral absorption type air-surveying air chamber and method for improving air diffusion speed

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Embodiment Construction

[0019] The present invention is described in further detail below in conjunction with accompanying drawing:

[0020] see figure 1 , 2 , a spectral absorption type gas measuring gas chamber, including a single-mode optical fiber 1, a multi-mode optical fiber 2, a first miniature sealed cavity 3, a second miniature sealed cavity 4, a first segment of hollow-core optical fiber 5, a second segment of hollow-core optical fiber 6 and micro-vacuum pump 7; First air outlet 17 is set at the top of the first miniature airtight chamber 3, and second air outlet 18 is set at the top of the second micro-airtight chamber 4, and the first air outlet 17 and the second air outlet 18 are connected to the micro-vacuum pump 7. The single-mode fiber 1 and the first section of the hollow-core fiber 5 are connected in the first micro-sealed cavity 3, the multi-mode fiber 2 and the second section of the hollow-core fiber 6 are connected in the second micro-sealed cavity 4, and the first section of th...

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Abstract

The invention discloses a spectral absorption type gas-surveying gas chamber. The top of a first micro closed cavity is provided with a first gas outlet, the top of a second micro closed cavity is provided with a second gas outlet, and the first gas outlet and the second gas outlet are connected with a micro vacuum pump; monomode optical fiber and first segment hollow-core optical fiber are connected in the first micro closed cavity, and multimode optical fiber and second segment hollow-core optical fiber are connected in the second micro closed cavity; the first segment hollow-core optical fiber is connected with the second segment hollow-core optical fiber; and a detection light source enters the first segment hollow-core optical fiber by the monomode optical fiber and then enters the multimode optical fiber by the second segment hollow-core optical fiber, and is outputted to a photo detector by the multimode optical fiber. The invention provides a gas chamber for measuring spectral absorption type gas. The gas chamber has the advantages of small volume, easy bending and high coupling efficiency, and optical length absorption of the gas can be increased by increasing the length of the optical fiber; moreover, the diffusion speed and escape speed of the environmental gas in a gas cavity can be improved.

Description

Technical field: [0001] The invention belongs to the field of gas measurement and relates to a spectral absorption type gas measurement gas chamber. Background technique: [0002] The measuring gas chamber is the sensitive component of the spectral absorption fiber optic gas sensor, and there are two main methods currently used. [0003] (1) One-way gas chamber: a fiber collimator is installed on both sides of the gas chamber. The optical fiber collimator at the input end converts the light transmitted in the optical fiber into approximately parallel light and injects it into the gas chamber, and the optical fiber collimator at the output end couples the light absorbed by the gas into the optical fiber for further transmission. The working distance of the fiber optic collimator is generally only tens of centimeters, so the gas absorption optical path of the single-pass gas chamber is short, and the gas detection system formed by it has low sensitivity. [0004] (2) Multi-r...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/01
Inventor 丁晖梁建奇李仙丽崔俊红
Owner XI AN JIAOTONG UNIV
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