Seawater temperature and salinity sensor, measurement system and method based on double guided mode resonance effect

Abstract

The invention discloses a seawater temperature and salinity sensor, measurement system and method based on double-guided mode resonance effect, and belongs to the technical field of marine detection. The seawater temperature and salt sensor includes a single-mode optical fiber and a nano-prism array located at the end face of the single-mode optical fiber. The single-mode optical fiber includes a core and a cladding covering the core; the nano-prism in the array is formed by a low-refractive index dielectric material. The nanoprism is composed of a nanoprism and a high-refractive-index dielectric material layer deposited on its outside. The high-refractive-index dielectric material layer covers the entire single-mode fiber end face, and the lengths of two adjacent sides on the cross-section of the nanoprism are not equal; the measurement system includes a broadband light source, The polarization controller, the fiber optic coupler and the seawater temperature and salinity sensor are connected through the transmission optical fiber between the fiber optic coupler and the seawater temperature and salt sensor, and the fiber optic coupler is connected to the computer through the spectrometer. The seawater temperature and salinity sensor, measuring system and method disclosed by the invention can simultaneously measure seawater salinity and temperature, have narrow spectral line width and high measurement sensitivity.

Description

technical field [0001] The invention relates to the technical field of marine detection, in particular to a seawater temperature and salinity sensor, measurement system and method based on dual guided mode resonance effects. Background technique [0002] With the vigorous development of marine research, seawater salinity is one of the important parameters in hydrological research, and its measurement is becoming more and more important, and its accuracy requirements are getting higher and higher. The salinity of seawater is mainly determined by the refractive index of seawater, which makes it possible for micro-nano optical sensors to measure the salinity of seawater. However, the refractive index of the medium changes with the temperature, mainly because the change of temperature will cause the thermo-optic effect of the medium, which will lead to the change of the refractive index of the medium, so only the refractive index measured at a certain temperature has significan...

AI Technical Summary

Problems solved by technology

Although the system can realize dual-parameter measurement, due to the use of electric resonance and magnetic resonance, the spectral line width is large, which affects the accuracy of spectral decoupling, and the system can only be used for laboratory measurement and cannot achieve long-distance measurement.

In summary, the simultaneous measurement of seawater salinity and temperature still has problems such as complex systems, inability to measure remotely, and wide spectral lines.

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