Linear array signal processing circuitry for locating the midpoi

Details Linear array signal processing circuitry for locating the midpoi Linear array signal processing circuitry for locating the midpoi

1978-12-26

1980-09-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, 356387, G01N 2130

Patent

active

042219736

ABSTRACT:
Circuitry for locating the mid-point of a spot of illumination on a time-base-scanned linear photodetector (photodiode) array. With each scan, the array produces, from the illuminated photodiodes, a pulse made up of individual "pixils" having different discreet DC voltage levels. This pulse is filtered to smooth it, and is then compared with a DC reference to produce a related square-wave pulse whose length depends on the time that the level of the filtered pulse exceeds that of the reference. Clock pulses at two different frequencies are provided, and are counted (at different times) from the beginning of each scan until the end of such a square-wave pulse. The desired mid-point is determined from the total count obtained during a scan.

REFERENCES:
patent: 3944814 (1976-03-01), Goto
patent: 4105925 (1978-08-01), Rossol et al.
patent: 4129384 (1978-12-01), Walker et al.

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