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6.4.7 Dark Calibration
Modern CMOS detectors offer a number of advantages compared to more traditional
CCD detectors, including increased sensitivity over a wider wavelength range and faster
detector read-out. Similarly to CCD detectors, their performance, however, strongly
depends on temperature. As a consequence, some background counts from thermal
electrons are typically recorded, even when no light hits the detector chip. First-order
data reduction must be applied to all recorded images in order to remove noise
associated with the CMOS detector.
The RS40k has a Peltier-cooled scientific CMOS sensor to minimise this effect. The
cooler is activated in the device software RedSolve. The lowest temperature that can be
reached is 40°C below ambient. We recommend operating the detector at about -10°C
(set by default) to achieve the best performance and sensitivity. The sensor temperature
and detector chamber humidity is always displayed in the lower right corner of the
software interface (Figure 12).
Figure 12: The sensor temperature is shown in the lower right corner of the software interface.
°C
If the sensor temperature is not within ±1
of the set temperature it will be highlighted in red.
To remind the user, a warning will be displayed if an acquisition is attempted when the
sensor has not yet cooled to the set point (Figure 13).
°C
Figure 13: The user will be cautioned if the sensor temperature is not within ±1
of the set
°C
temperature. Note, the default setting is -10
.
© Redback Systems Pty Ltd
v1.5
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