Encoder, Measuring, Angular
Tuesday, September 05, 2006
An Angular Measuring Encoder has been designed and developed that is based on mirror reflection angular multiplication. Angular displacements are optically multiplied, accomplished by a unique mirror system. The octagon mirror wheel is free to rotate about an axis and the seven surrounding mirrors are held stationary. If the octagon is rotated through a 0.1 arc second angle, an autocollimator will see a 0.1 arc second times 16 reflections equals 1.6 arc second change in angle. When used with an autocollimator and external mirrors, the return ray is actually deviated by 0.32 times since the autocollimator light beam makes two passes through the system. The autocollimator is calibrated to read half this amount when used in a single mirror setup. The optical system is sensitive only to angular changes in the azimuth plane. Since an octagon has an even number of faces, any tilt or runout in the elevation plane is not observed at the autocollimator.
Source: William Hunter, Hunter Metrology Company, Louisville, KY; Ph 1-502-239-1617
Reference: Optical Angle Generator (OAG)
Industrial Products
posted by JD52 @ 9:38 PM,
