Fig. 1. Schematic diagram of the distributed temperature sensing system

Fig. 2. Intensity of Raman scattered light. (a) Light intensity distribution on the sensing fiber; (b) normalized scattered light intensity at different temperatures

Fig. 3. Measurement results of the DTS system with a ring fiber structure. (a) Temperature measurement result; (b) temperature measurement error

Fig. 4. Intensity of the ground noise

Fig. 5. Measurement results for different temperatures before and after the noise floor correction. (a) Measurement result of temperature; (b) temperature measurement error

Fig. 6. Rayleigh noise calculated under different temperature

Fig. 7. Measurement results and temperature measurement errors before and after Rayleigh noise correction. (a) Measurement value of temperature; (b) temperature measurement error

Fig. 8. Temperature measurement error of DTS system