| 摘要 |
The intensity meter has a photo-multiplier (15) with a photocathode (16) and a dynode system (D). Depending on the intensity of the light to be measured, either the rate of anode pulses from the photo-electron multiplier (15) or the amplitude of the direct current from the photocathode or both are used to obtain a measured value. The amplitude of the dark current including the leakage current from the measuring apparatus is determined, stored and used to correct measured values, to enable a cathode photo current (Ik photo) to be determined whose leakage current has been compensated. An Independent claim is included for a light intensity meter.
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