Reflective fiber sensor for simultaneous measurement of seawater salinity and temperature

Abstract

The invention belongs to the technical field of fiber sensing and discloses a reflective fiber sensor for simultaneous measurement of seawater salinity and the temperature. The sensor comprises a halogen light source, a Y-type fiber, a sensing unit, a spectrometer and a host computer, wherein the halogen light source is connected with the sensing unit through a branch of the Y-type fiber, the sensing unit is connected with the spectrometer through another branch of the Y-type fiber, the spectrometer is connected with the host computer, the sensing unit is formed by a multi-mode fiber and a single-mode fiber which are cascaded, the multi-mode fiber and the single-mode fiber are coaxially welded, an outer surface and an end surface of the single-mode fiber are plated with a gold film, and outer periphery of the gold film is plated with a temperature sensitive film from a welding end of the single-mode fiber to the half-length position of the single-mode fiber. The sensor is advantaged inthat not only can simple manufacturing process, low cost and stable structure be achieved, but also, through simultaneous measurement of seawater salinity and the temperature, influence of the temperature on seawater salinity measurement accuracy can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing and relates to a reflective optical fiber sensor for simultaneous measurement of seawater salinity and temperature. Background technique [0002] Seawater salinity and temperature are the most basic parameters of the seawater equation of state, which are crucial to climate models, affect the survival of organisms in the ocean, and have a special effect on climate regulation. activities, marine traffic, marine productivity and fishery production [Nguyen L V, Vasiliev M, Alameh K. Three-wave fiber Fabry–Pérot interferometer for simultaneous measurement of temperature and water salinity of seawater[J].IEEEPhoton.Technol.Lett .,2011,23(7):450-452.]. Optical fiber sensing technology is a new technology that uses light as a carrier and optical fiber as a medium to sense and propagate changes in the external environment. When the light wave is transmitted in the optical fiber, the charact...

AI Technical Summary

Problems solved by technology

In 2018, WANG Y et al [Wang Y, Huang Q, Zhu W, et al. Novel optical fiber SPR temperature sensor based on MMF-PCF-MMF structure and gold-PDMS film [J]. Optics Express, 2018, 26( 2): 1910-1917.] Proposed a fiber optic temperature sensor based on photonic crystal fiber structure and PDMS, the measurement sensitivity reached -1.51nm / ℃, and the measurement stability was good, but this sensor was complicated to manufacture and could not be used for long-distance transmission

Most critically, the performance of current sensors for the simultaneous measurement of refractive index and temperature has not yet reached the ideal level

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