Temperature control
235
Goldeye G/CL Technical Manual V4.2.0
If the case temperature keeps rising, the difference between sensor- and case
temperature exceeds the predefined
Δ
T.
The temperature control is no longer able
to keep the sensor temperature at the current setpoint. The TEC switches up to the
next higher setpoint. The existing NUC data, that is optimized for the default
setpoint conditions, is still applied at other setpoints.
Example
The Peltier element of the Goldeye G-033 and CL-033 TEC1 can achieve a
Δ
T of
25 kelvin. Its default temperature setpoint is set to +20 degrees Celsius.
If the camera is switched on at an ambient temperature of +8 degrees Celsius, the
TEC cannot cool down the sensor to the default setpoint, because the ambient
temperature is below the default setpoint. Thus, the TEC cools down the sensor to
setpoint 1, which is at +5 degrees Celsius. (See
example. Note for better understanding: the case temperature profile is shown in a
simplified way that covers the whole temperature range.)
The camera then heats up, and the temperature passes setpoint 2. Later it reaches
+30 degrees Celsius, the point that is 25 kelvin above the current setpoint. If the
camera temperature continues to rise, the TEC is no longer able to maintain the set
temperature. No later than at this point in time, the TEC switches to the next
higher setpoint, which in this case is the setpoint 2 at +20 degrees Celsius.
Figure 72: Schematic figure of setpoint switching upwards
