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13 August 1998 Chemical Bragg grating sensor network based on side-polished optical fiber
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An optochemical sensor network has been developed which performs on-line measurements of multi-point distributions of various chemicals. The side-polished optical fiber elements with wavelength multiplexed fiber optic Bragg gratings are sensitive to refractive index changes in thin film overlays as well as in the more extended superstrate material. A multi-layered slab waveguide model has been used for theoretical investigation of the efficiency of evanescent field interaction with fiber gratings. From these results, the structural parameters of the sensor can be optimized. The sensitivity to small refractive index changes is high for materials with a refractive index near to that of the fiber core. However, the deposition of a thin buffer layer with adapted high refractive index can enhance the sensor efficiency also for detecting materials with lower refractive index. The sensor network can be applied for process control in chemical and biochemical technology, and for environmental and geotechnical monitoring in hazardous or corrosive surrounding.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wolfgang Ecke, Kerstin Usbeck, Volker Hagemann, Rudolf Mueller, and Reinhardt Willsch "Chemical Bragg grating sensor network based on side-polished optical fiber", Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); doi: 10.1117/12.318217;

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