Patent ID: 8324604

Claim:
A web edge sensor comprising: a web roller guide providing guiding to a web; a light source directing light along a first axis and edge-on to an edge of the web, the edge of the web scattering and reflecting the light; and a linearly arranged array of fiber optic sensors facing substantially the same direction, each of the fiber optic sensors in the array facing along an axis that is non-parallel to the first axis, where each sensor detects a first portion of the light scattered from the edge of the web and rejects a second portion of the light scattered from the edge of the web to produce a voltage; wherein the first portion of the light is incident to the sensor at an angle that is less than a predetermined angle from the normal to the sensor, and the second portion is incident at an angle that is equal to or greater than the predetermined angle; and wherein a position of the web is determined based upon a relative difference in voltages produced by the fiber optic sensors.