Laser beam apparatus and method for analyzing solar cells

Details Laser beam apparatus and method for analyzing solar cells Laser beam apparatus and method for analyzing solar cells

1978-08-21

1980-05-27

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 64, G01R 2714

Patent

active

042052653

ABSTRACT:
A laser beam apparatus and method for analyzing, inter alia, the current versus voltage curve at the point of illumination on a solar cell and the open circuit voltage of a solar cell. The apparatus incorporates a lock-in amplifier, and a laser beam light chopper which permits the measurement of the AC current of the solar cell at an applied DC voltage at the position on the solar cell where the cell is illuminated and a feedback scheme which permits the direct scanning measurements of the open circuit voltage. The accuracy of the measurement is a function of the intensity and wavelength of the laser light with respect to the intensity and wavelength distribution of sunlight and the percentage the dark current is at the open circuit voltage to the short circuit current of the solar cell.

REFERENCES:
patent: 3549999 (1970-12-01), Norton
patent: 3745454 (1973-07-01), Nikirk
patent: 4051437 (1977-09-01), Lile
patent: 4084188 (1978-04-01), Gorog
patent: 4122383 (1978-10-01), Frosch
patent: 4129823 (1978-12-01), van der Pool

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