Abstract
A battery powered radiant energy integrator is described. The sensor is a miniature silicon photovoltaic cell operated in the reverse bias mode. Current from the cell is integrated on a capacitor and the time integral stored in an electromechanical counter. The instrument has good linearity over five decades of light intensity and good stability both with respect to temperature and battery voltage. Flashlight batteries provide sufficient power to operate the instrument unattended for several months.
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