Photoelectric instrument for measuring the length of an object

Details Photoelectric instrument for measuring the length of an object Photoelectric instrument for measuring the length of an object

1975-07-09

1977-05-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250235, 250237R, G01N 2130

Patent

active

040257967

ABSTRACT:
A photoelectronic instrument for measuring the length of an object by means of a slim scanning beam of light which, when not interrupted by the object, activates a photoelectric transducer, wherein, for the purpose of determining trigger points when half the light beam is obscured at the beginning and reemerges at the end of the period of cut-off, irrespective of the absolute magnitude of the light flux of the unobscured light beam, a circuit is provided for differentiating, with respect to time, a signal obtained from the photoelectric transducer and proportional to the magnitude of the light flux (light flux signal U.sub.1), a signal proportional to the differential quotient (dU.sub.1 /dt) thus obtained being rectified, multiplied by a preset factor (p.T), and the product of the multiplication and the light flux signal (U.sub.1) being applied to the inputs of a comparator functioning as a coincidence circuit for generating an output signal (U.sub.4) which, subject to an appropriate selection of the factor (p.T), abruptly changes when ##EQU1## WHERE U.sub.o is the light flux signal of the unobscured scanning light beam.

REFERENCES:
patent: 2659823 (1953-11-01), Vossberg
patent: 3710128 (1973-01-01), Kubisiak
patent: 3777167 (1973-12-01), Shepherd
patent: 3907439 (1975-09-01), Zanoni

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