Cooling and power supply
Regulated two-stage thermoelectric cooling is capable to cool the CCD chip
from 45 to 50 °C below ambient temperature, depending on the camera type.
The Peltier hot side is cooled by a fans. The CCD chip temperature is regulated
with ±0.1 °C precision. High temperature drop and precision regulation ensure
very low dark current for long exposures and allow proper image calibration.
G3 cameras are available in two variants, differing in the cooling performance:
●
Standard
cooling cameras achieve temperature difference up to 45 °C
Under environment temperature.
●
Enhanced
cooling cameras can regulate temperature up to 50 °C
under environment temperature. Compared to standard variant,
enhanced cooling cameras are somewhat bulkier due to bigger heat
sink, slightly heavier and somewhat noisier because of more powerful
fans.
The camera head contains two temperature sensors – the first sensor measures
directly the temperature of the CCD chip. The second one measures the
temperature of the air cooling the Peltier hot side.
The cooling performance depends on the environmental conditions and also on
the power supply. If the power supply voltage drops below 12 V, the maximum
temperature drop is lower.
CCD chip cooling
Thermoelectric (Peltier modules)
Standard cooling ΔT
48 °
C
below ambient maximum
45 °
C
below ambient typical
Enhanced cooling ΔT
53 °
C
below ambient maximum
50 °
C
below ambient typical
Regulation precision
±
0.1 °C
Hot side cooling
Forced air cooling (two fans)
Optional liquid coolant heat exchanger
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