Detector Response Speed --
To determine system frequency and response time

Both PbS and PbSe detector time constants increase (i.e., response speeds decrease) with a decrease in temperature (see figure below). By customizing deposition parameters, detectors with faster (decreased) time constants, at a given operating temperature, can be produced. A number of readily available PbS chemistries, characterized by their time constants at +23¼C, are shown in the Figure to the left (e.g., PbS with a time constant of less than 100 µsec at room temperature, is shown in the figure as PbS 100 µsec).

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