CONTACTLESS DISPLACEMENT DETECTOR EMPLOYING OPTICAL FIBER

摘要

PURPOSE:To manufacture a contactless displacement detector utilizing an optical fiber with a high sensitivity and a wide measuring range by providing an angle between a light projecting optical fiber and a light receiving optical fiber. CONSTITUTION:Light from a light source is irradiated on the surface to be measured through a light projecting optical fiber and a light receiving optical fiber arranged in a probe with an angle and the reflected light is taken out to generate electric signals according to the quantity of the reflected light. The signals are processed to measure displacement of the surface to be measured. For example, light is irradiated on an areas on the surface with a light project- ing fiber 1 at a distance r therefrom and the light from an area S' is received with a light receiving fiber set at a distance d from said fiber with an angle alpha. The relationship of a signal output P according to the quantity of the light to the distance r is as shown by the chart with the angle alpha as parameter. Thus, a wide range of measurement can be done at a high accuracy.