Accession Number : ADD003591

Title :   All-Sky Photoelectric Lightning Detector Apparatus.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Krider,Edmund Philip

Report Date : 10 Feb 1976

Pagination or Media Count : 5

Abstract : A pair of position sensing photodiodes of a conventional quadrature or dual-axis type are deployed face-upwardly at a predetermined distance one from the other. A vertically pointing fisheye lens covers each of the position sensing diodes so that the diodes view a full 360 deg in azimuth and about 180 deg in zenith angle. Each of the diodes produces four current outputs whose fractional distribution provides the location of the optical center of a luminous source, such as a lightning discharge. The outputs, in turn, are applied to a data acquisition system, such as a simple analog computer, which provides the location data for the lightning discharge as well as its total intensity. The circuit applying the outputs to the data acquisition system includes filtering means for eliminating background noises and passing to the system only the optical transients of the discharge. (Author)

Descriptors :   *Patents, *Lightning, *Photodiodes, Photoelectric cells(Semiconductor), Detectors, Circuits, Analog computers, Sky, Position finding

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE