Method and system for increasing the effective dynamic range...

G - Physics – 01 – J

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340/124.5

G01J 1/32 (2006.01) G01S 7/491 (2006.01)

Patent

CA 1298380

- 1 - Abstract of the Disclosure In active range finder apparatus wherein an object to be inspected is illuminated by a laser source and light reflected by the object is detected in an imaging photo- sensor, a system is provided for increasing the dynamic range of the apparatus. This system provides for integrat- ing over each of a series of measuring time periods light reflected from a window of the photosensor and hence proportional to the light received by such photosensor. When such integrated light exceeds a predetermined amount, a saturation signal is generated that immediately de-energises the source. If this amount is not reached by the end of each period, the system is reset. The source is gradually re-energised at the commencement of each subsequent period. The virtually instantaneous de-energisation and gradual re-energisation combined with use of a saturation detector separate from the main photosensor ensures rapid action that is quick enough to substantially avoid saturation of such main photosensor.

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