Patent ID: 8390795

Claim:
An optical system comprising: a plurality of selectably directable mirrors each arranged to direct a laser beam to a selectable location within a field; a plurality of mirror orientation sensors operative to sense the orientation of said plurality of selectably directable mirrors and to provide mirror orientation outputs; and an automatic calibration subsystem for automatically calibrating said plurality of selectably directable mirrors, said automatic calibration subsystem comprising: a target having an area at least as large as the field of each of said selectably directable mirrors and being operative to provide an optically visible indication of impingement of a laser beam thereon; said target being rewritable and having optically visible fiducial markings; a target positioner for selectably positioning said target in the fields of respective ones of said selectably directable mirrors while each respective one of said selectably directable mirrors directs said laser beam to a selectable location thereon; an optical sensor operative to view said target following impingement of said laser beam thereon and to provide laser beam impingement outputs; and a correlator operative in response to said mirror orientation outputs and said laser beam impingement outputs to provide a calibration output.