Patent ID: 7911614

Claim:
A non-contact measurement probe, comprising: a hollow, tubular housing; a laser head disposed in a rear portion of the housing; a fiber optic cable extending from the laser head, the fiber optic cable delivering source lighting to the laser head; a beam splitter cube mounted in front of the laser head, amplified coherent light transmitted from the laser head being split into a first horizontal beam and a vertical beam; a right angle mirror disposed above the beam splitter cube, the right angle mirror redirecting the vertical light beam into a second horizontal beam above parallel to the first horizontal beam, the first and second horizontal beams extending along a longitudinal axis of the tubular housing; a main lens forming a front end of the tubular housing, the second horizontal beam being refracted by the main lens as the second beam exits the housing through the main lens in order strike a workpiece so that a combination of the refracted second horizontal beam and light of the refracted second beam being reflected off of the workpiece form a cone of light having a crossing angle, a portion of the light cone traversing back inside the housing through the main lens; a collecting lens in the housing disposed behind the main lens, the collecting lens focusing the portion of the light cone entering the housing; an electronic photoreceptor positioned behind the collecting lens, the electronic photoreceptor receiving focused light from the collecting lens, the electronic photoreceptor transmitting an output signal responsive to the received focused light; an amplifier-filter combination processing the photoreceptor output signal; a signal processor in operable communication with the amplifier-filter combination, the signal processor being configured to perform a differential Doppler analysis based on the transmitted and reflected laser light received by the electronic photoreceptor, thereby determining roundness of the workpiece based on the cone of light reflected by the workpiece; and a beam stopper disposed in a front portion of said probe housing, wherein the beam stopper attenuates the first horizontal beam.