Hollow core fiber photo-thermal spectroscopy gas sensor and gas concentration detection system thereof

Abstract

The application discloses a hollow optical fiber light-heat spectrum gas sensor and a gas concentration detection system thereof, and relates to the technical field of optical fiber gas detection. The first sensor (00) is sequentially connected with a detection light (1), an incident detection light end single-mode optical fiber (2), a to-be-detected gas molecule (3), a Bragg hollow optical fiber (10), a multimode optical fiber (12), an incident pump light end single-mode optical fiber (13) and a pump light (14). The Bragg hollow optical fiber (10) is a hollow optical fiber with four high-refractive Bragg layers doped in a solid cladding. The application adopts a full optical fiber, naturally forms a gas passage in the optical fiber, and does not need to additionally introduce a complex gas interface structure. The sensor has the advantages of fast response speed, good stability, simple manufacturing process, low cost, avoidance of a tedious processing process such as femtosecond laser drilling, and avoidance of a bulky space alignment structure. The application provides a feasible technical path for realizing the application of the optical fiber gas sensor in multiple fields.

Images