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Filber Bragg Grating Salinity Sensor

Author: ZhaoZhiWen
Tutor: GuanBaiOu
School: Dalian University of Technology
Course: Optical Engineering
Keywords: Fiber grating Fiber Optic Sensors Salinity sensor
CLC: TP212.14
Type: Master's thesis
Year: 2011
Downloads: 98
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Abstract


Salinity is an important physical parameters of the solution . Changes in seawater salinity a strong intrinsically linked with the marine environment and climate change . Real-time accurate detection of the salinity of marine aquaculture , marine environmental protection , marine resources development and modern military are of great significance . The conductivity sensor and microwave method currently used measurement method has its own difficult to overcome the shortcomings , it is difficult to meet the evolving needs of the community . Therefore, the performance of research and development of new salinity sensor , it is particularly important . This article is based polyimide coated fiber grating salinity sensor was designed and fabricated , and research and analysis of the influence of the thickness of the sensitivity and response time . The main contents are as follows: 1 . Introduce a definition of salinity measurement technology and applications of fiber optic sensors , briefly describes the development and production of fiber grating writing light source 193nm excimer laser using a phase mask method produced fiber Bragg grating and grating growth spectrum . 2 . Establish the model of longitudinal strain sensing fiber grating the salinity sensor sensing mechanism . And a brief introduction to the development , characteristics and applications of the polyimides . 3 is proposed and produced a salinity sensor based on the polyimide coating of the fiber grating . The temperature of 180C, a coating thickness of 64μm , the sensitivity of the sensor as 17.5pm / ( mol / L ) . Experimental Study of the relationship between sensitivity and response time of this sensor with the thickness of the coating , has a good linear relationship between sensitivity and coating thickness , the coefficient of 0.2pm / ( mol / L) μm , and the response time increases with thickness . In a particular case , you should select the appropriate coating thickness to obtain the appropriate sensitivity and response time .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Physical sensors > Light sensor
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