Patent ID: 9612177
Date: 2017-04-04
CPC Classifications: G01B,G01M,G02B

Claim:
1. A method of measuring a concentricity between an optical fiber core of an optical fiber held by a ferrule and a true center of the ferrule, comprising: generating ferrule distance data by measuring distances to a ferrule outside surface as a function of rotation angle using a distance sensor and rotating either the ferrule or the distance sensor about an axis of rotation that is off-center from the true ferrule axis; generating core location data about the optical fiber core by coupling light from the optical fiber core into a core sensor, wherein the light from the optical fiber core is received by a doubly telecentric light collection optical system of the core sensor; using the ferrule distance data and core location data to determine a position of the true ferrule center relative to the optical fiber core; and measuring the concentricity as the distance between the true center of the ferrule and the optical fiber core.