All-sky photoelectric lightning detector apparatus

Details All-sky photoelectric lightning detector apparatus All-sky photoelectric lightning detector apparatus

1974-12-09

1976-02-10

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250211R, 250216, 356 1, H01J 3912

Patent

active

039379515

ABSTRACT:
A pair of position sensing photodiodes of a conventional quadrature or duaxis 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.degree. in azimuth and about 180.degree. 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.

REFERENCES:
patent: 3147380 (1964-09-01), Buckingham et al.
patent: 3226557 (1965-12-01), Goodman
patent: 3515879 (1970-06-01), Weischendel et al.
patent: 3801821 (1974-04-01), Sharpe et al.

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