Patent ID: 9436003
Filing Date: 2016-09-06
CPC Classification: G01C,G01D,G01S,G02B

Claim Text:
1. A method for obtaining a reference correction value for an angular encoder in a laser scanner, the method comprising: providing the laser scanner, the laser scanner having a body, a light source, a first motor, a second motor, a first angle measuring device, a second angle measuring device, a distance meter, and a processor, the body including a reference reflector, the light source configured to launch a transmission light beam, the distance meter configured to receive a portion of the transmission light beam reflected off an object and to determine a distance from the scanner to the object in response, the distance based at least in part on the speed of light in air, the first motor and the second motor configured to direct the transmission light beam to a first direction, the first angle measuring device configured to measure a first angle of rotation about a first axis, the second angle measuring device configured to measure a second angle of rotation about the second axis, the first direction determined by the first angle of rotation and the second angle of rotation, the first angle measuring device being the angular encoder, the angular encoder including a patterned element and a read head assembly, the read head assembly including a first read head and a second read head, the patterned element including a plurality of incremental marks and an index mark; in a first instance: in a second instance: determining with the processor the reference correction value based at least in part on the first difference angle and the second difference angle.