Gas sensor probe based on multi-point reflected spiral light path and detecting device

Abstract

The invention provides a gas sensor probe based on a multi-point reflected spiral light path and a detecting device. A light source module, a spiral light path module and a detector module are included. The light source module is used for emitting parallel light signals. The spiral light path module comprises a plurality of reflection mirrors and a plurality of linear light paths. Each linear light path and the adjacent linear light path are connected in a head to tail mode at a certain angle and are spiral inwardly, and at least one reflection mirror is detachably fixed between the two adjacent linear light paths. The spiral light path module is used to increase a light path length of the light signals, and the light signals pass through the spiral light path module, then enter into the detector module and are converted into electrical signals. Through the design of the multi-point reflected spiral light path, a volume of a sensor probe absorption pool is reduced and a measurement light path is increased, and simultaneously the stability and the reliability of the light path are greatly improved. Debugging difficulty during production is reduced and production and processing costis decreased.

Description

technical field [0001] The disclosure relates to the technical field of laser spectrum gas sensors, in particular to a gas sensor probe based on a multi-point reflection spiral optical path. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In recent years, photoelectric measuring instruments that use the principle of infrared laser spectral absorption to measure gas composition and concentration are developing in the direction of high sensitivity, full range, small volume, and low cost to meet the growing demands of environmental safety detection and production safety monitoring. Require. Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology utilizes the characteristics of tunable and narrow spectral linewidth of semiconductor lasers. By tuning the laser wavelength at the spectral absorption peak of the detected gas, the laser w...

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Problems solved by technology

For example, in the patent application CN2017114551770, an optical path module with four through holes is used, and the light beams in the four through holes are reflected by three mirrors to form a "measuring optical path of rhombus optical path", which reduces the sensor probe The size; in the patent application CN106908412A, an optical path module with two reflectors is used, and the optical path is changed by two reflectors, so that the optical path of the gas chamber under the same volume is more than doubled, and it is also reduced. The purpose of the size of the sensing probe, but the main problem of these measurement gas chamber optical paths is that the measurement optical path is relatively short. When used in the measurement of some gases (such as CO) that require a long measurement optical path, the measurement accuracy is difficult to improve

[0005] Therefore, the inventors of the present disclosure believe that the current problems to be solved are as follows: (1) the miniaturization development trend of the gas sensor probe makes the gas chamber further reduced, which in turn leads to a further reduction in the measurement optical path, which cannot improve the measurement accuracy; (2) the combined The traditional optical path design needs to be adjusted every time it is used, and the stability and accuracy of the optical path cannot be guaranteed

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