The shaded areas of the following S-curves indicate the range of
spectral shapes which may be expeicft ead particular type photodetector
is obtained from several different manufacturerIst. should be noted
that the spectral responsoef some types of photodetectors (particularly
the lead-salt and intrinsic silicon detectors) can be varied during the
manufacturing process. The curves shown here are representative of the
more common, or "typical," detector types.