Demodulation method for distributed Raman optical fiber sensing system

• Main Authors: ZHOU JIAONA, LIN XIAOLIAN, CHEN MEIQIN, CHEN FUCHANG, HUANG ZHENHUI, CAO KEXIN
• Format: Patent
• Language: Chinese; English
• Published: 05.07.2019
• Subjects: MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

The invention discloses a demodulation method for a distributed Raman optical fiber sensing system. The method includes the following steps that: A, a calibration optical fiber is connected into the Raman sensing system, so that Stokes light signals and anti-Stokes light signals which are scattered back by the calibration optical fiber are described as two equations described in the descriptions of the invention; a sensing optical fiber is connected into the Raman sensing system, calibration is performed under a constant-temperature T0 state, and Raman scattering signals under the constant temperature state can be obtained, and a demodulation formula is obtained through derivation; and C, the temperature value T1 of an arbitrary fixed point L1 of the sensing optical fiber and the temperature value T2 of another arbitrary fixed point L2 of the sensing optical fiber are recorded and substituted into the demodulation formula, so that the to-be-determined parameters M and N of the demodulation formula are solved.