Abstract
We propose a method for the estimation of the spectral response of a photodetector, using only the variation of the temperature of a black body source without the need of an expensive monochromator or a circular filter. The proposed method is suitable especially for infrared detectors in which the cut-off wavelength and the responsivity vs. wavelength is not exactly known. The method provides a rough estimation of the spectral response solving a Fredholm integral equation of the first kind. The precision of this technique depends on the temperatures at which the detector output is measured. Some examples are given for illustration.
Highlights
Infrared photodetectors are currently used in many applications; in civil and military applications [1], in particular for surveillance [2,3], target detection and tracking for missile systems and night vision in battlefields [4]
Π L2 where r is the radius of the black-body aperture in μm, r0 is the radius of the receiver’s optical aperture in μm, L is the distance between the black body and the photodetector in cm, σT 4 is computed from the Stefan-Boltzman equation: Z
We proposed several basis functions to solve the Fredholm integral equation obtained varying the black-body temperature
Summary
Infrared photodetectors are currently used in many applications; in civil and military applications [1], in particular for surveillance [2,3], target detection and tracking for missile systems and night vision in battlefields [4]. One of the most promising fields of application is the passive detection of infrared radiation coming from objects in a given field of view. In order to design an infrared passive system it is mandatory to know the parameters characterizing the detector [5]. For the staring detectors the noise-equivalent temperature difference (NETD) is very important because it gives information about the sensitivity of the 2D array. Responsivity can be defined as the ratio between the electrical signal of the detector and the incident optical power
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