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Fiber optic proximity sensor

A proximity sensor is a device used to detect the presence of an object. Fiber optic proximity sensors are devices which use a light beam transmitted from a light source by way of a bundle of light conducting optical fibers from a light source to a target. The light is reflected off the target and returned along other optical fibers in the bundle back to a light intensity sensor in the instrument. The intensity of the returning light is a function of the distance between the proximity probe tip and the target, so the output of the light sensor can be a very precise measure of that distance, or changes in that distance. In such optical proximity sensors a distance to a target is determined by directing light from a source through a fiber optic bundle to the target and then measuring the intensity of the light reflected by the target. Typically, one sensor bundle comprises two sets of fibers, each set originating from a respective arm, the two sets being joined in a common leg. Light is transmitted from a light source through one arm to the target and the corresponding light reflected from the target is conducted by the other arm to a light sensor. The intensity of the reflected light is indicative of the distance between the end of the common leg and the target. An optical proximity sensor includes a light-emitting source such as a light-emitting diode and a light-detecting device such as a photodiode.

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