| OCR Text |
Show 94 reflected light, and filtered in software. system. electromagnetic Software is used interference to calibrate is the By requiring each light source sensing assembly to measure the positions of at least seven light sources placed at known locations, position and transformation matricies expressing the orientation assembly are determined. of each light source These transformation matricies map three-dimensional space into the one-dimensional the light source sensing assemblies. of the tangents scanner matricies. least boxes, of of linear of angles between slits and midpoints of usable focal planes, implied by the the spaces The transformation is reversed to express equations of planes in terms combinations sensing output of and the elements of the transformation A three-dimensional position is established by a mean squares approximation to the determined scanning planes. There are sources of optical, environmental, and calibration mechanical, electrical, errors. Unremovable distortion in the objective lense s is the largest source error. Point spread additional optical removed to the and errors. limited depth Mechanical jitter on mechanical errors. photomultiplier field cause errors have been extent that they may be distinguis hed from unremovable electrical and optic al errors. time of of pulses In particular, from the scanner boxes overshadows Certain phenomena such as noise from the tubes and the associated electronics, |
