Patent ID: 6768100
Filing Date: 2004-07-27
Classification: G01D,H05K

Abstract:
An optical calibration trigger system for a servo controlled reciprocating rotary device, comprising:an optical calibration rotor attached to a rotating element of said rotary device, said rotating element having a pre-determined full range of rotation, and said rotor having at least one light collimating slit; at least one stationary light emitter proximate one side of said rotor; and at least one stationary light detector proximate the other side of said rotor and directed towards a corresponding one of said light emitters, each detector configured for emitting an optical calibration trigger signal upon detection of light received through said at least one light collimating slit, thereby indicating a load coupled to said rotating element is at a known fiducial position within said full range of rotation: wherein upon occurrence of a said calibration trigger signal, said known fiducial position is compared to a concurrently measured position of said load, thereby generating a calibration error for adjusting a reported position.