Method and system for increasing the effective dynamic range of

Details Method and system for increasing the effective dynamic range of Method and system for increasing the effective dynamic range of

1989-10-05

1990-10-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214R, G01J 132

Patent

active

049670662

ABSTRACT:
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 photosensor, a system is provided for increasing the dynamic range of the apparatus. This system provides for integrating 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-energizes the source. If this amount is not reached by the end of each period, the system is reset. The source is gradually re-energized at the commencement of each subsequent period. The virtually instantaneous de-energization and gradual re-energization 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.

REFERENCES:
patent: 4266123 (1981-05-01), Friberg
patent: 4443695 (1984-04-01), Kitamura
patent: 4555621 (1985-11-01), Buchar
patent: 4642451 (1987-02-01), Tsunekawa et al.
patent: 4643571 (1987-02-01), Ferber et al.
patent: 4658368 (1987-04-01), Blais
patent: 4677287 (1987-06-01), Ejima
patent: 4687920 (1987-08-01), van der Linden
patent: 4725723 (1988-02-01), Shimojima
"Practical Considerations for a Design of a High Precision 3-D Laser Scan System" by Francois Blais et al.-published in Optomechanical and Electro-Optical Design of Industrial Systems, SPIE Proceedings 1988,
"Real-Time Numerical Peak Detector" by Francois Blais et al., published in Signal Process, 11(2), 1986, pp. 145-155, or in F. Blais, U.S. Pat. No. 4,658,368 Issued Apr. 14, 1987.

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