All-fiber annular cavity sensing device for carbon isotope detection

The utility model discloses an all-fiber annular cavity sensing device for carbon isotope detection, which comprises a time-delay fiber and an input fiber, the time-delay fiber and the input fiber are both used for connecting a detection light source, and detection light has different delays after passing through the time-delay fiber and the input fiber; the optical fiber annular passage comprises a hollow-core optical fiber gas chamber, the two opposite ends of the hollow-core optical fiber gas chamber are connected with the output end of the delay optical fiber and the output end of the input optical fiber respectively, and the probe light is propagated in the optical fiber annular passage and circularly passes through the hollow-core optical fiber gas chamber; to-be-detected gas with carbon isotopes is filled in the hollow-core optical fiber gas chamber, the hollow-core optical fiber gas chamber is used for introducing pump light, and the gas performs phase change on detection light under the action of the