Abstract
The basic principle of sensing is the combination of F-P cavity interference and fiber grating reflection. A hybrid structure sensor probe has been designed based on the combination of an F-P cavity of liquid-filled thermometer structure, and a fiber grating with an elastic diaphragm, herein F-P cavity is used for temperature sensing, and the fiber grating is used for pressure sensing. By adopting the dual optical path structure, the dual-parameter detection of temperature and depth is realized, which solves the problem of low accuracy caused by the cross response of temperature and pressure of a single sensor device and the calculation of the depth information of the ocean with empirical formulas. Compared with traditional sensors, the sensitivity is effectively improved. Theoretical analysis shows that the sensitivity of the F-P cavity with a thermometer structure filled with kerosene reaches 1.334 nm/?C, and the depth sensitivity of the fiber grating is 284.6 pm/Mpa within the ocean depth range of 0 - 400 m.
Highlights
Temperature and depth are the most basic and important parameters in marine physics
A hybrid structure sensor probe has been designed based on the combination of an F-P cavity of liquid-filled thermometer structure, and a fiber grating with an elastic diaphragm, F-P cavity is used for temperature sensing, and the fiber grating is used for pressure sensing
Theoretical analysis shows that the sensitivity of the F-P cavity with a thermometer structure filled with kerosene reaches 1.334 nm/ ̊C, and the depth sensitivity of the fiber grating is 284.6 pm/Mpa within the ocean depth range of 0 - 400 m
Summary
Temperature and depth are the most basic and important parameters in marine physics. With the continuous development of optical technology, optical sensors have been used in marine resource development, climate monitoring, military industry and other fields [1] [2] [3] [4]. Expendable bathythermograph (XBT) is a commonly used structure in ocean temperature depth sensing, its sensitivity and response time are the most important technical parameters. MCFL’s reflective composite sensing optical path design eliminates the effect of MC free port pair on the sensor, and the temperature sensitivity of 248.2 pm/ ̊C and the depth sensitivity of 122.6 pm/Mpa is obtained. This structure provides a new design for the marine environmental parameter sensor based on the micro-fiber coupler. Experiments show that the strain sensitivity can reach −9.29 pm/μ and the temperature sensitivity can reach 17.14 pm/ ̊C If this structure is further improved, it will have the potential for high-sensitivity detection of ocean depths. Theoretical analysis and calculation, a sensor structure with good temperature sensitivity and depth sensitivity have been designed, which provides a feasible solution for further application on XBT
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