A seawater temperature and salt sensor, measurement system and method based on double resonance effect

Abstract

The invention discloses a seawater temperature and salinity sensor based on a double resonance effect, a measurement system and a method, and belongs to the technical field of marine detection. The seawater temperature and salt sensor includes a single-mode optical fiber and a nano-cylindrical tetramer array on the end face. The single-mode optical fiber includes a core and a cladding; the nano-cylindrical tetramer in the array consists of two sets of nano-cylindricals with the same height and different radii. The centers of the four nano cylinders are located at the four vertices of the square, and the centers of the nano cylinders with the same radius are located at the adjacent vertices of the square; the nano cylinder tetramer is a high refractive index dielectric material; the measurement system includes a broadband light source, polarization control The optical fiber coupler, the optical fiber coupler and the seawater temperature and salinity sensor are connected through transmission optical fibers, and the optical fiber 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 ocean detection, in particular to a seawater temperature and salinity sensor, measurement system and method based on double resonance effects. Background technique [0002] In the field of ocean detection, seawater temperature and salinity are extremely important ocean physical and chemical parameters. Seawater temperature and salinity are almost involved in all ocean fields, and the performance of seawater temperature and salinity sensing equipment is also constantly improving. Although traditional electrical sensors have achieved accurate measurement of seawater temperature and salinity, they have the risk of water leakage and are expensive. Optical fiber sensing technology occupies an important position in the field of sensors due to its advantages of long transmission distance, low loss, underwater passive and low cost. [0003] At present, someone proposes a low detection limit inner cavity sensor t...

AI Technical Summary

Problems solved by technology

Although the system can realize dual-parameter measurement, it has low sensitivity and large spectral linewidth due to the use of electric resonance and magnetic resonance, which affects the accuracy of spectral decoupling, and the system can only be used for laboratory measurement and cannot realize remote sensing. distance measurement

[0006] To sum up, the sensors that simultaneously measure seawater temperature and salinity still have problems such as complex systems, inability to measure remotely, and difficulties in spectral demodulation caused by spectral line width, which affects measurement accuracy.

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