Detector/Filter United Detector Technology Photodiode

The OSI Optoelectronics / United Detector Technology PIN-10DFP/PIN-10AP/PIN-10RP Detector/Filter Photodiodes combine PIN silicon photodiodes and multiple element colored glass subtractive filters. The glass subtractive filter is computer designed to correct the detector spectral response to the desired spectral response. This is accomplished by cementing together as many as five separately polished colored glass types and then individually mating this filter to a spectrally selected photodiolde. All three of the combinations, PIN-10DFP/PIN-10AP/PIN-10RP, are mounted in identical housings. The detector has a BNC output.

The PIN-10DFP produces a flat spectral response from 450 nanometers to 950 nanometers. This is the spectral response required for radiometric measurements, and is the response exhibited by thermopiles. The advantages of the PIN-10DFP over thermopiles are stability and sensitivity. The PIN-10DFP is a thousand times more sensitive than a thermopile, and ten times more stable than a thermopile.

The PIN-10AP produces a spectral response that duplicates the human eye (C.I.E. standard photopic curve). This is the spectral response required for photopic measurements.

The PIN-10RP produces a spectral response that duplicates the C.I.E. photopic curve in the red region, from 5800Å to 7200Å. By concentrating the filter design on this region only, an extremely close match has been achieved. The deviation between the PIN-10RP spectral response and the C.I.E. curve is less than 5%. This close match is especially useful for visible LED measurements in photopic units. A correct value for LED photopic output is obtained independent of LED peak wavelength.