Method and apparatus for measuring the flash duration of a flash

Details Method and apparatus for measuring the flash duration of a flash Method and apparatus for measuring the flash duration of a flash

1989-09-29

1991-11-19

Rosenberger, Richard A.

Optics: measuring and testing

Photometers

Photoelectric

356226, 250214R, 354416, G01J 142, H01J 4014

Patent

active

050661213

ABSTRACT:
In a method of measuring the flash duration of a flash unit, the momentary light intensity is converted into an electrical signal that is determined and stored, and that is delayed by at least that time interval that exists between the beginning of the flash curve and the maximum thereof. The stored maximum is compared with the delayed signal, with the flash duration being determined from the signal obtained thereby. As a result, at the maximum of the intensity/flash duration curve, the information concerning the rising leg of this curve is still available. The apparatus comprises a sensing element for the flash intensity, with the sensing element being followed by a time-lag element and a peak detector, the outputs of which are connected to a comparator, the output of which is connected to a time-interval measuring circuit.

REFERENCES:
patent: 2996624 (1961-08-01), Mumma
patent: 3802768 (1974-04-01), Robinson et al.
patent: 4479704 (1984-10-01), Masunaga
patent: 4496230 (1985-01-01), Nakai et al.
patent: 4636053 (1987-01-01), Sakane et al.

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