Tunable-laser-based quartz tuning fork enhancement type photo-acoustic spectrum distributed optical fiber gas sensor

Abstract

The invention discloses a tunable-laser-based quartz tuning fork enhancement type photo-acoustic spectrum distributed optical fiber gas sensor. The tunable-laser-based quartz tuning fork enhancement type photo-acoustic spectrum distributed optical fiber gas sensor comprises a laser source (1), a plurality of sensing units (5) and a phase-locking amplifier (6), wherein the sensing units (5) are cascaded by an optical fiber and distributed in one area; the laser output by the laser source (1) is transmitted to a first-level sensing unit (5) by virtue of a distributed optical fiber (4); the laser output by the first-level sensing unit (5) is used as incident light and enters a second-level sensing unit (5), so the cascading utilization of the laser energy can be achieved in a similar manner; detection signals output by the sensing units (5) are sent to the phase-locking amplifier (6); the output of the phase-locking amplifier (6) is connected with a control terminal (7); and the control terminal (7) is used for displaying and alarming the input detection signals. The tunable-laser-based quartz tuning fork enhancement type photo-acoustic spectrum distributed optical fiber gas sensor is efficient and reliable, and is high in sensitivity and strong in adaptability.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a quartz tuning fork enhanced photoacoustic spectrum distributed optical fiber gas sensor based on a tunable laser. Background technique [0002] With the development of life science, material science, artificial intelligence and other disciplines, gas sensors play an important role in atmospheric monitoring, food industry, rapid real-time measurement of automobile exhaust, safety inspection of toxic gas detection, aerospace, medical diagnosis and anti-terrorism and explosion protection. Value. The infrared optical gas sensor represented by the principle of infrared absorption gas detection has high precision, good selectivity, sensitivity and reliability, fast response, wide measurement range, no poisoning, no dependence on oxygen, less environmental interference factors, long life, etc. Significant advantages, but limited by the complex structure and high cost of infrare...

AI Technical Summary

Problems solved by technology

[0004] At present, a gas detection system combining quartz tuning fork-enhanced photoacoustic spectroscopy gas detection technology and distributed optical fiber sensing technology has not been reported.

Images