Fig. 1. Overall design of distributed Raman thermometry system

Fig. 2. Linear relationship between standard temperature and fiber-measured temperature

Fig. 3. Temperature distribution before and after Gaussian fitting

Fig. 4. Temperature distribution before and after correction

Fig. 5. Temperature sensor of ice sheet profile

Fig. 6. Sensor layout and data collection

Fig. 7. Freezing and frozen temperature data

Fig. 8. Temperature distribution in vertical direction of ice sheet

Fig. 9. New ice sheet thickness by manual measurement

Fig. 10. Temperature distribution in vertical direction of river water