Seawater salinity measuring device and method with temperature self-decoupling function

The invention belongs to the related technical field of seawater salinity measurement, and provides a temperature self-decoupling type seawater salinity measurement device and method, and the device comprises a light emitting device, a first beam splitter and a processing unit; the light emitting device is used for emitting a light beam to the first beam splitter; the first beam splitter is used for splitting a light beam emitted by the light emitting device into a first light beam and a second light beam; the light beam after the first light beam passes through the measurement channel and the light beam after the second light beam passes through the reference channel form an interference light beam; and the processing unit is used for demodulating the phase difference of the formed interference light beams to obtain the seawater salinity. In seawater salinity measurement, the phase difference of interference signals is only related to seawater salinity, and the precision of seawater salinity measurement is i