Temperature measuring method of distributed multi-section optical fibers, system and storage medium

A system comprising a distributed optical fiber thermometer and an optical fiber with multiple segments, the optical fiber with multiple segments divided into at least one high-temperature optical fiber and at least one ordinary optical fiber interlaced to be connected with the at least one high-temperature optical fiber, the system further comprising a memory, a processor and computer programs stored in the memory and performed by the processor to implement a temperature measuring method;

• the method comprising the following steps:
• S10, obtaining data of original stokes signals and data of anti-stokes signals in a while optical fiber;
• S20, distinguishing data of a segment of a high-temperature optical fiber and data of a segment of an ordinary optical fiber according to a discontinuous point of signal data;
• S30, performing interpolation calculation on the data of the segment of the high-temperature optical fiber and the data of the segment of the ordinary optical fiber, respectively, according to their respective corresponding group refractive indexes, to align the data of the stokes signals with the data of the anti-stokes signal in distance at each sampling moment;
• S40, according to the data of the aligned stokes and anti-stokes signals, performing temperature data calculation on the data of the segment of the high-temperature optical fiber and the data of the segment of the ordinary optical fiber, respectively;
• S50, separately connecting the segment of the ordinary optical fiber and the segment of the high-temperature optical fiber with a distributed fiber thermometer and a high-an-low temperature controller, so as to obtain calibration parameters of the ordinary optical fiber and the high-temperature optical fiber, respectively;
• S60, generating a final temperature according to temperature data of the segment of the high-temperature optical fiber and the segment of the temperature data of the ordinary optical fiber, and their corresponding calibration parameters.

A computer readable storage medium configured to store computer programs, the computer programs performed by a processor to implement a temperature measuring method applied to a temperature measuring system of distributed multi-section optical fibers, the temperature measuring system comprising a distributed optical fiber thermometer and a optical fiber with multiple segments, the optical fiber with multiple segments divided into at least one high-temperature optical fiber and at least one ordinary optical fiber interlaced connected with the at least one high-temperature optical fiber, the method comprising the following steps:

• S10, obtaining data of original stokes signals and data of anti-stokes signals in a while optical fiber;
• S20, distinguishing data of a segment of a high-temperature optical fiber and data of a segment of an ordinary optical fiber according to a discontinuous point of signal data;
• S30, performing interpolation calculation on the data of the segment of the high-temperature optical fiber and the data of the segment of the ordinary optical fiber, respectively, according to their respective corresponding group refractive indexes, to align the data of the stokes signals with the data of the anti-stokes signal in distance at each sampling moment;
• S40, according to the data of the aligned stokes and anti-stokes signals, performing temperature data calculation on the data of the segment of the high-temperature optical fiber and the data of the segment of the ordinary optical fiber, respectively;
• S50, separately connecting the segment of the ordinary optical fiber and the segment of the high-temperature optical fiber with a distributed fiber thermometer and a high-an-low temperature controller, so as to obtain calibration parameters of the ordinary optical fiber and the high-temperature optical fiber, respectively;
• S60, generating a final temperature according to temperature data of the segment of the high-temperature optical fiber and the segment of the temperature data of the ordinary optical fiber, and their corresponding calibration parameters.