Extension of dynamic range of integrated multi-diode photodetector - using subdivision of clock frequency for second scan to relate integration time linearly to position of photoelement.

摘要

The integration time of a measurement is made dependent on location of the photoelements by variation (6) of the input clock signals of the sensor (10). It can also be adapted to the intensity of incident light. The measurement involves two readouts in succession with a longer readout time for the second scan. A divider unit (4) reduces the clock frequency for the latter from that of the first scan, giving a simple linear relationship between integration time and photoelement position. ADVANTAGE - Dynamic range of photodetector is used over entire spectrum.