Long-optical-path gas detection device with fine adjustment mechanism

Abstract

The invention relates to a long-optical-path gas detection device with a fine adjustment mechanism. The long-optical-path gas detection device comprises a container, wherein the container is internally provided with an airtight gas chamber; a first concave mirror and a second concave mirror which are arranged opposite to an emitting surface are arranged in the gas chamber of the container; a fine adjustment reflecting mirror is arranged on one side of the first concave mirror; a parallel light emitter and a photoelectric sensor are arranged on the container and positioned on the two sides of the first concave mirror; the parallel light emitter is close to the fine adjustment reflecting mirror; a light source emitting end of the parallel light emitter and a light ray receiving end of the photoelectric sensor stretch into the gas chamber. The long-optical-path gas detection device adopts a multiple reflection method to reduce the volume of the gas chamber and improve the detection capability of an instrument. The fine adjustment reflecting mirror can change the path of reflected light and reflect back the reflected light again, so the effective optical path can be increased and the standard distance effect can be avoided.

Description

technical field [0001] The invention belongs to the fields of precision processing technology and optical technology, and particularly relates to a long optical path gas detection device with a fine-tuning mechanism applied to gas-phase spectrum analysis instruments such as TDLAS (Tunable Semiconductor Laser Absorption Spectroscopy). Background technique [0002] With the development of my country's industrial control, iron and steel metallurgy, petrochemical, environmental protection, biochemical pharmaceuticals, electric power, aerospace and other industries, it is necessary to further strengthen the monitoring and control of the production process in these fields. This puts forward higher requirements for the detection accuracy, response time, system stability and other indicators of the process analyzer used in the production process. On-line analysis of gas phase substance concentration is widely used in production process monitoring, production process optimization, po...

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Problems solved by technology

However, in the case of no reflection of the optical path, the longer the optical path, the larger the volume of the instrument gas cell, which is often inconvenient to carry

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