Folding type multi-reflection cavity for enhancing gas Raman signal

Abstract

The invention discloses a folding type multi-mirror cavity for enhancing a gas Raman signal. The folding type multi-endoscope comprises a head-end endoscope, a tail-end endoscope and a plurality of folding mirrors, the head-end endoscope, the tail-end endoscope and the folding mirrors form an enhancement cavity for reflecting light path folding; the head-end endoscope is provided with a light through hole, laser passes through the head-end endoscope through the light through hole to enter the enhancement cavity, and the incident direction of the laser is not perpendicular to the angle between the folding mirror which the laser reaches first after the laser enters the enhancement cavity; after entering the enhancement cavity, the laser is reflected by the folding mirror to reach the tail-end endoscope and then is reflected; and the reflected laser is reflected for multiple times in the enhancement cavity along different paths until the laser reaches the head-end endoscope, just passes through the light through hole again and is emitted out of the enhancement cavity. According to the folding type multi-reflection cavity provided by the invention, laser can be reflected for hundreds of times in the cavity, and the detection limit of multi-component gas Raman spectrum detection can reach sub-ppm magnitude.

Description

Technical field [0001] The present invention belongs to the field of gas Raman spectroscopy, involves a folded multi-antfer cavity for gas Raman signal enhancement. Background [0002] Gas detection has broad demand in the fields of environmental pollution detection, safety gas monitoring, industrial process control. The Raman spectroscopy gas detection method is a gas component based on the gas-based Raman effect, and by measuring the gas component of the gas generated by the laser irradiation light, the gas component is measured by measuring the gas content of the gas content by measuring the amount of gas content of the scattered light intensity. [0003] Compared with the currently used gas detection method, Raman spectroscopy has the following advantages: almost all gas components can be detected at the same time; different gas components are disturbed to each other, high selectivity; non-destructive detection, no loss, do not destroy gas to be tested . Therefore, Raman spec...

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Problems solved by technology

The linear multi-mirror anti-cavity has high optical stability and strong anti-interference ability; however, the number of reflections of the linear double-mirror multi-anti-cavity is small (usually more than 100 times), and the signal enhancement is low

[0007] Therefore, the current cavity-enhanced gas Raman signal enhancement method is difficult to balance high enhancement amplitude and high stability

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