Fig. 1. Schematic diagram of temperature and salt sensor based on GTG

Fig. 2. Input optical power spectrum and reflected optical power spectrum of drawing tower fiber grating

Fig. 3. Schematic diagram of the experimental system

Fig. 4. Temperature response of fiber optic sensor

Fig. 5. Comparison of temperature response of electronic sensor and fiber optic sensor

Fig. 6. Comparison of temperature measured by electronic sensor and wavelength shift of uncoated DTG

Fig. 7. Salinity response of PI-coated DTG measurements without temperature compensation

Fig. 8. Salinity response of temperature-compensated PI-coated DTG measurements

Fig. 9. Dynamic response process of DTG7 with salinity

Fig. 10. Salinity response after temperature compensation