Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1999-02-24
2000-10-24
Buczinski, Stephen C.
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
2502081, 250214DC, 2502062, 25055937, 701152, 356 501, G01B 1126, G01C 308, G01C 2124, H01L 2700
Patent
active
061375667
ABSTRACT:
An apparatus for receiving signals from a photodetector in a photodetector array. The apparatus has a number of comparators (e.g. 5) connected to the photodetector. each photodetector in the array has a similar circuit connected. Each comparator compares the output of the photodetector with an adjustable threshold level. Each threshold level is controlled by a threshold controller. Each threshold level corresponds with a light intensity value. Outputs of the comparators are each connected to a shift register. Each shift register is triggered to sample the output of its associated comparator at a certain speed (e.g. 800 Mhz). In operation, the shift registers each store a bit sequence representative of the comparator output. The data acquired is used to adjust the threshold levels applied to the comparators. In this way, adjustable intensity resolution is provided at desired ranges of intensity. The present invention includes a method for combining data from multiple laser pulses and fitting the data to a best fit statistical distribution so that an intensity value is obtained for each voxel in a 3-D laser radar image. Also, the present invention includes embodiments where different photodetectors in the array have different set threshold levels.
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Bolstad Jay
Driscoll Thomas
Leonard Donald
Schultz David
Sweeney Harold
Buczinski Stephen C.
EOO, Inc.
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