Responsivity Map(s)
This process scales the input value in accordance with current calibration
wavelength and the responsivity map downloaded from the detector calibration
module. The output of this process, i.e. the measurement value,
is
the digitized
input value divided by the responsivity associated with the current calibration
wavelength or the user defined calibration value. Different responsivities are
used depending upon
if
the attenuator, AITN, annunciator
is
lit, Section 2.4.5.
Units Correction
Units correction adjusts a measurement value to account for the display units
selected. When the display units are equal to the detector signal units, i.e. equal
to the numerator of the responsivity units, the measurement value is not
adjusted. Otherwise the digitized value
is
adjusted to account for detector
responsivity and/or additional unit conversions such
as
W to W/cm2.
NOTE
Per area unit conversions such
as
W to W/cm2 divide the measurement value
by the active area of the detector. This calculation assumes that the entire
active area of the detector
is
uniformly illuminated. Per area measurements
where the entire detector active area
is
not uniformly lit are not accurate. The
user must insure that these conditions are met before utilizing per area units.
The flexibility of the Model 28324 analog signal flow
is
required in order that
it may properly measure the signals that various types
of
detectors make.
Basic optical power measurements are related to a measured detector signal,
S,
in the following way:
Where:
R,=
Detector responsivity at
A.
S
=
Detector signal
Newport Low-Power semiconductor detectors provide a current signal. The
2832C
is
capable of lOOfA resolution in order to provide the highest sensitiv-
ity performance with these detectors.
Analog
Output
The Model 2832-C provides a 0 to 2.5 volt, into 50R,BNC analog output for
signal monitoring. The analog output is the actual amplified detector signal
and is uncorrected for the effects of the detector's responsivity, AUTO CAL,
and ZERO.
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