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13 August 1998 Fiber optic external perturbation sensor with ring-wedge photodetector
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The construction of the fiber-optic sensor for the recognition of perturbations and result of its studies are presented. As a sensor head the sample of two-mode optical fiber is used.Changes of intermodal interference condition, caused by external perturbation, generated changes of output speckle pattern. This output has been concerned as an intensity image and diffraction method, known from an automatic image recognition, has been applied for its recognition. For this reason the ring-wedge photodetector has been placed in Fourier plane of the image studied. The digital signal generated by this detector has been processed by software neural network. As the effect of suitable process of network training, a possibility of the perturbation recognition has been obtained without a necessity of troublesome analysis of intermode interactions. An additional advantage of this solution is the possibility to train the network to eliminate slow environmental perturbations.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Leszek R. Jaroszewicz, Idzi Merta, and Aleksander Kiezun "Fiber optic external perturbation sensor with ring-wedge photodetector", Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998);

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