responsivity, R

in detection of radiation
Also contains definitions of: dark current, dark output, dark resistance, relative responsivity, spectral responsivity function, useful spectral range
https://doi.org/10.1351/goldbook.R05347
Detector input can be e.g.
radiant power
,
irradiation
,
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.
ampere
/
watt
,
volt
/
watt
. 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 dark output. 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 relative responsivity. For measurements with monochromatic radiation at a given
wavelength
the term
spectral responsivity
R(λ) 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.
Source:
PAC, 1995, 67, 1745. (Nomenclature, symbols, units and their usage in spectrochemical analysis-XI. Detection of radiation (IUPAC Recommendations 1995)) on page 1749 [Terms] [Paper]