Measurement of Gear Tooth Form Deviation by Laser Interferometry Using CCD Image Sensor.

Abstract

Laser interferometry using the CCD image sensor is applied for the purpose of measuring form deviation of a gear tooth flank. The interference fringe pattern on the CCD image sensor for the target curved surface involves a thick density of fringes in the region outside of the optical axis, and it also contains a considerable amount of noise. It is therefore difficult to convert discontinuous phase data corresponding to the interference fringe into continuous phase data by direct application of the conventional data processing method. In this report, a new digital data processing method is introduced to develop a method for obtaining form deviation of the gear tooth flank. Tooth flank form deviations with longitudinal tooth lead crowning, helix angle deviation and pressure angle deviation were measured by this new method. The results are compared with those of the conventional method using a contacting stylus, and the accuracy of the new measuring method is discussed.