A bending, and position, sensor is composed of a fiber optic or light wave guide, for attachment to the member which is to be bent, or displaced. Light is injected at one end and detected at the other end. Bending of the fiber results in light loss through a surface strip or band, along one side of the...http://www.google.ca/patents/US5321257?utm_source=gb-gplus-sharePatent US5321257 - Fiber optic bending and positioning sensor including a light emission surface formed on a portion of a light guide
