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Gas detector

A gas detector, gas technology, applied to instruments, by detecting the appearance of fluid at the leak point, measuring devices, etc., can solve the problems of high false alarm rate and achieve the effect of reducing memory capacity

Active Publication Date: 2022-03-01
国家航空航天研究所 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, such detection methods often yield high false alarm rates

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Embodiment Construction

[0069] For the sake of clarity, the dimensions of elements shown in these drawings do not correspond to actual dimensions or ratios of actual dimensions. Furthermore, the same references indicated in the various figures designate the same or elements with the same function.

[0070] In the remainder, the invention is described in detail for a gas detector with four optical channels and a gas detector designed to indicate the presence of gaseous methane in a surface environment. The choice of spectral bands then depends not only on the target gas to be detected, ie methane, but also on the absorption bands of compounds in the ground atmosphere. Among the atmospheric compounds to be considered, water vapor (H 2O) is particularly important, but carbon dioxide (CO 2 ) can also participate in the analytical method implemented in the detector. It should be understood, however, that the present invention is not limited to methane as a target gas, that a different number of optical...

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Abstract

A gas detector for displaying a target gas comprises an image capture unit (10) having a plurality of optical channels (10a, 10b,...), an image processing unit (20) and a computing unit (30). The image processing unit is adapted to infer a value of a radiation transmission coefficient related to the analysis of the spectral band and attributable to an amount of target gas present in the portion of the field of view. Preferably, multiple analysis bands are used in parallel. The computing unit is adapted to infer an evaluation of the amount of the target gas based on the value of the radiation transmission coefficient associated with each analysis zone. Such a gas detector has a small size, is easy to transport on a drone, and can provide an evaluation result of the amount of the target gas in real time or almost in real time.

Description

technical field [0001] The present invention relates to a gas detector, for example for detecting the leakage of a gas such as methane in any environment, in particular outdoors. Background technique [0002] Many situations require determining whether an identified gas is present in a region of space, whether in an outdoor environment or inside an enclosed volume, for example, in a building or mine. This can be used to confirm the safety of locations that may contain large quantities of hazardous or toxic gases, or to search for the occurrence of accidental leaks in pipelines used to carry or distribute gases. Specifically, such detection needs to involve 4 ), but depending on the application involved, such needs also exist for other gases. [0003] A well known way for detecting gases consists in using imaging instruments sensitive to radiation in the spectral band in which the gas is absorbing. Documents US 2016 / 097713 and US 2018 / 011009 provide descriptions of such im...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504G01M3/38
CPCG01N21/314G01N21/3504G01N2021/1793G01N2021/3531G01M3/38G01M3/22G01N33/0027G01N21/61G01J5/0014G06T7/97G01M3/04G06T7/90
Inventor 皮埃尔-伊维斯·福彻古伊劳姆·德鲁阿尔特
Owner 国家航空航天研究所