Resources: Photoconductive Infrared Detectors and Emitters - Technical Notes - Frequency Response
To Define the Range of Incident Radiation over which Signal is Linear to irradiance
At a given chopping frequency (F), detector responsivity (Rf) is related to its responsivity at 0 Hz (R0) as follows:
where τ is the detector time constant.
PbS and PbSe detectors exhibit typical 1/f noise, and accordingly, at a given chopping frequency, detectivity, D*(f) can be expressed as:
Typical frequency response of PbS/PbSe detectors is shown below:
