Abstract

The natural law of open circuit voltage response of a silicon junction photovoltaic cell has been combined here with that obtained across the junction of a similar but nonilluminated cell due to an injected current, based on which a temperature independent, precision logarithmic light meter is developed. The range of the meter corresponds almost to the photosensitive range of the cell which in the present case is 10−1–10+4 lx. The over-all theoretical response law obtained here has been checked experimentally at several points, and the accuracy has been found to be well within 1% over an ambient temperature change of about ±3°C. The logarithmic response obtained here is potentially very useful in instrumentation requiring analog computation with optical signals.

© 1978 Optical Society of America

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