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Design and Fabrication of a Fiber Optic Based Sensor for On-line Determination of Concentrate Liquids

Momeni, Behnam | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44658 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Golnabi, Hossien; Hormozi Nezhad, Mohammad Reza
  7. Abstract:
  8. Design and construction of an optical fiber sensor for liquid concentration detection are reported. This sensor operates based on light intensity modulation.Such modulation results from alteration of total internal reflection into partial reflection at the interface. It is well known that the extinction ratio is varied by changing the concentration.In this system,two optical fiber swere used, one transmitting the light source, another acting as the receiving fiber and a glass prism providing the total and partial reflections. The modulated intensity has been measured by using a receiving fiber. During the concentration measurements, when a liquid in a vessel touches the 45° faces of the 45-90-45° prism, the total internal reflection is disturbed and the reflected light is modulated. The performance of this sensor is tested with a diode laser and extinction ratio has been measured for different liquids and compared. The distinct results obtained for different samples demonstrate that there is are lation ship between there fractive index and extinction ratio that the reported sensor can also be used as a liquid refractometer.Measuredinliquid water, methanol, ethanol, calcium chloride, glucose, glycerol, benzene, carbon disulfideand antifreezewereextinction ratiorespectivelyis 0.00514, 0.00513, 0.00490, 0.00381,0.00278,0.00256,0.00193, 0.00123,0.00093
  9. Keywords:
  10. Fiber Optics ; Liquid Concentraction ; Sensors

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