Accession Number : ADD001560

Title :   Automatic Sensitivity Adjustment in Flash Blindness Protective Device.

Descriptive Note : Patent,


Personal Author(s) : Jekowski,Edward W ; Foster,Kenneth J

Report Date : 25 Sep 1973

Pagination or Media Count : 7

Abstract : The invention is an automatic sensitivity adjustment for day-night operation in flash blindness protective apparatus. It is obtained by supplying an electrical signal produced by a light detector in response to transient light through a differentiator circuit to a first comparator which provides an output signal if the differentiated electrical signal exceeds a first predetermined amplitude. If the electrical signal produced by the light detector in response to ambient light exceeds a predetermined maximum at a second comparator, the second comparator supplies an output signal to the first comparator to change the first predetermined amplitude to a second predetermined amplitude. An output signal from the first comparator initiates operation of eye protective measures. An interlock switching circuit provides protection from high voltages when the apparatus is not in use.

Descriptors :   *Patents, *Protective equipment, *Flashblindness, Eye, Protection, Blindness, Sensitivity, Automation, Light

Subject Categories : Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE