Detector input can be e.g. radiant power
, radiant energy
. It produces a measurable detector output which may be e.g. an electrical charge,
an electrical current or potential or a change in pressure. The ratio of the detector
output and the detector input is defined as the responsivity. It is given in e.g.
. The responsivity is a special case of the general term sensitivity
Dark current is the term for the electrical output of a detector in the absence of
input. This is a special case of the general term
For photoconductive detectors the term
dark resistance is used. If the responsivity is normalized with regard to that obtained
from a reference radiation the resulting ratio is called
For measurements with monochromatic radiation at a given wavelength
the term spectral responsivity
is used. In some cases the relative spectral responsivity
, where the spectral responsivity
is normalized with respect to the responsivity at some given wavelength
, is used. The dependence of the spectral responsivity
on the wavelength
is described by the
spectral responsivity function.
The useful spectral range of the detector should be given as the wavelength
range where the relative responsivity does not fall below a specified value.
PAC, 1995, 67, 1745
(Nomenclature, symbols, units and their usage in spectrochemical analysis-XI. Detection
of radiation (IUPAC Recommendations 1995))
on page 1749
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook