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

Abstract

The invention discloses a seawater temperature and salinity sensor based on a double-resonance effect, and a measurement system and method, and belongs to the technical field of ocean exploration. The seawater temperature and salinity sensor comprises a single-mode optical fiber and a nanometer cylindrical tetramer array located on the end face, and the single-mode optical fiber comprises a fiber core and a wrapping layer; a nanometer cylinder tetramer in the array is composed of two sets of nanometer cylinders with the same height and different radiuses, the circle centers of the four nanometer cylinders are located at the four vertexes of a square, and the circle centers of the nanometer cylinders with the same radiuses are located at the adjacent vertexes of the square; the nano cylindrical tetramer is made of a high-refractive-index dielectric material; and the measuring system comprises a broadband light source, a polarization controller, an optical fiber coupler and a seawater temperature and salinity sensor, the optical fiber coupler and the seawater temperature and salinity sensor are connected through a transmission optical fiber, and the optical fiber coupler is connected with a computer through a spectrograph. According to the seawater salinity and salinity sensor, and the measurement system and method disclosed by the invention, the salinity and the temperature of seawater can be simultaneously measured, the spectral line width is narrow, and the measurement sensitivity is high.

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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