Fig. 1. Schematic diagrams of the sensor. (a) Sensor structure diagram; (b) metal funnel

Fig. 2. Schematic diagram of sensor force

Fig. 3. Schematic diagram of Fabry-Perot interferometric sensing

Fig. 4. Finite element simulation of sensor deformation. (a) Stress distribution within the sensor; (b) the relationship between membrane deformation and temperature

Fig. 5. Schematic diagram of circulating water tank test system

Fig. 6. Temperature and salinity changes monitored by CTD during flow rate measurement process

Fig. 7. Flow velocity measurement spectra and fitting curves. (a) Sensor spectra at different flow velocities; (b) fitting curve of DIP wavelength variation with flow rate near 1550 nm

Fig. 8. Comparison of flow velocity sensitivity and error. (a) Sensitivity variation curves with flow rate near 1550 nm; (b) comparison between experimental sensitivity and theoretical sensitivity of sensors

Fig. 9. Temperature measurement experiment spectra and sensitivity curves, as well as comparison with theoretical values. (a) Sensor spectra at different temperatures; (b) temperature fitting curves; (c) comparison between experimental sensitivity and theoretical sensitivity

Fig. 10. Sensor test results. (a) Comparison of sensor and CTD test results; (b) comparison of sensor and ADV test results