Gas absorption cell with flexible structure, adjustable optical path and convenience in disassembly

Abstract

The invention relates to a gas absorption cell with flexible structure, adjustable optical path and convenience in disassembly. The gas absorption cell comprises a main cavity, a front sealing cover,a rear sealing cover and a sliding block integrated with a reflector module, wherein the upper surface of one end of the main cavity is provided with a gas inlet, the lower region of the side surfaceof the other end of the main cavity is provided with a gas outlet, and a sliding groove is formed in the tail end and used for assembling the sliding block integrated with the reflector module; a groove formed in the rear end of the front sealing cover is used for assembling an incident lens frame, an emergent lens frame and a first concave reflector, all accessories are connected in a sealed modeby means of sealing rings, and the whole structure of the front sealing cover is easy and convenient to disassemble and replace; the rear sealing cover only plays a sealing role; and the reflector module is integrated on the sliding block, angles of a second concave reflector and a third concave reflector are flexibly adjusted by means of a rotary displacement table on the base, and multiple reflections of light rays are achieved. Therefore, the optical path is changed, and the purposes of ultra-low concentration gas detection and detection sensitivity increase are achieved.

Description

technical field [0001] The invention relates to the technical field of gas analysis, in particular to a gas absorption cell with flexible structure, adjustable optical path and convenient disassembly. Background technique [0002] With the rapid development of industry, transportation and energy industries, a large amount of waste gas is discharged into the atmosphere, causing serious pollution to the living environment. Therefore, environmental protection is imminent. As a part of environmental protection, environmental monitoring has been paid more and more attention by the society. [0003] As an environmental monitoring equipment - gas absorption cell, its main principle is to use the absorption spectrum of the gas to analyze the composition and concentration of the gas. When the light beam enters from the light inlet, it is reflected multiple times in the cell, and finally exits from the light outlet. During the multiple reflections, the gas in the cavity absorbs the l...

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Problems solved by technology

[0004] At present, most of the gas absorption cells on the market cannot meet the ultra-low concentration gas detection, and generally have the following problems: First, once the cell structure is fixed, the gas cell cannot change the number of internal light reflections, that is, it cannot Changing the total optical path length makes it difficult to detect lower concentrations of gas; second, if the optical path length is to be increased, the number of reflections needs to be increased, but the reflectivity of the lens is too low, resulting in too much energy loss, and it will not be accurate Measure the gas concentration; Third, once the gas pool lens is fixed, it cannot be disassembled normally. When the lens is corroded or damaged, the important parts can only be replaced again, thereby increasing the cost; Fourth, in the case of ensuring the minimum number of return times, In order to increase the optical path length of some gas cells, the mechanical length of the gas cell is lengthened, which leads to the bulky structure of the whole system

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