Patent ID: 9482512
Filing Date: 2016-11-01
CPC Classification: G01B,G01N,G02B,H04N

Claim Text:
1. A method comprising: interfering optical energy emitted from a fiducial optical emitter in at least two directions to produce N fiducial output beams along N legs, where N is greater than or equal to 2; sequentially moving the fiducial optical emitter in a plurality of predetermined positions along a z axis; acquiring images based on each of the N fiducial output beams as the fiducial optical emitter is moved along the plurality of predetermined positions along the z axis to form an image frame sequence for each of the N fiducial output beams; determining, at each of the N legs and from the plurality of image frame sequences, at least one characteristic associated with each predetermined position of the fiducial optical emitter along the z axis; and storing the at least one characteristic and the predetermined positions of the fiducial optical emitter along the z axis.