High Sensitivity All Optical Fiber Conductivity-Temperature-Depth (CTD) Sensing Based on an Optical Microfiber Coupler (OMC)

An all optical fiber CTD sensor used in seawater based on an OMC is demonstrated. And the OMC is fabricated by fusing and tapering two twisted conventional communication fibers based on the improved flame-brushing method. By monitoring the sensing dips, in situ measurement of salinity, temperature,...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-06, Vol.37 (11), p.2739-2747
Main Authors: Yu, Yang, Bian, Qiang, Lu, Yang, Zhang, Xueliang, Yang, Junbo, Liang, Linmei
Format: Article
Language:English
Subjects:
All optical fiber sensing
Couplings
depth (pressure)
Detection
Environmental monitoring
Fiber optics
Hydrophones
In situ measurement
Microfibers
Optical fiber sensors
Optical fibers
Optical measuring instruments
optical microfiber coupler
Pressure measurement
Rangefinding
Salinity
Salinity (geophysical)
Seawater
Sensitivity
Tapering
Target detection
temperature
Temperature measurement
Temperature sensors
Water depth
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Summary:An all optical fiber CTD sensor used in seawater based on an OMC is demonstrated. And the OMC is fabricated by fusing and tapering two twisted conventional communication fibers based on the improved flame-brushing method. By monitoring the sensing dips, in situ measurement of salinity, temperature, and depth (pressure) in seawater can be realized, respectively. Especially, the water depth (pressure) sensing function of the OMC is demonstrated for the first time, and the pressure sensitivity is 50 times higher than a bare fiber Bragg grating (with a wide pressure measurement range from 0 to 25 MPa). The highest sensitivities of salinity, temperature, and depth are 1596 pm/ 0 / 00 , 2326 pm/°C, and 169 pm/Mpa, respectively. These are high enough for the requirements of marine dynamic environmental monitoring and underwater target detection of fiber-optic hydrophone system. The all optical fiber CTD sensor demonstrated here show advantages of easy fabrication, compact structure, high sensitivity, low cost, and compatibility with the optical fiber system, which may find applications in multifunction optical sensors in ocean detections and other applications.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2018.2878475