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| This is a mechanical arrangement to hold the fiber optic cable. It is possible to swing the incidence angle of the fiber light from 0 to 1800 in the horizontal plane, on to the detector. Using this device, it is possible to measure the critical angle of transmission. This information is useful to determine collection efficiency from an emitter and photo detector. The critical angle of a fiber depends on the core’s and cladding’s refractive indices. |
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