Datasheet: WS-7.56 Sensor

The PSS WS-7.56-TO5 Wavelength Sensor has two p-n junctions constructed vertically on a common silicon substrate. The upper diode has enhanced blue and the lower enhanced red response. Absorbed radiation between 450 and 900 nm thus generates two photocurrents proportional to the wavelength of the incident light. The quotient of the signals is independent of the light level up to the saturation point. The wavelength of impinging monochromatic light or the spectral density peak of polychromatic light can therefore be determined.