Temperature control
236
Goldeye G/CL Technical Manual V4.2.0
Switching to the lower setpoint
When the ambient temperature decreases, this causes the temperature of the
camera to decrease as well. With further temperature decrease, the sensor
temperature can fall below the current setpoint temperature. The TEC might be no
longer required to cool the sensor to the adjusted temperature setpoint. If the
sensor temperature no longer depends on the TEC cooling only, it becomes
unstable.
To avoid temperature instability, the TEC switches down to the next setpoint,
before the cooling power is reduced to the critical range at the current sensor
temperature.
To keep the current sensor temperature as long as possible, the TEC does not
switch down immediately when the Min.
Δ
T to the next temperature setpoint is
reached. These points are marked in green in
. Note for better
understanding the case temperature profile is shown in a simplified way that
covers the whole temperature range.
Special case: heating and cooling the sensor (G-008 and
CL-008 only)
Goldeye G-008 and CL-008 models can actively heat up the sensor, enabling the
TEC to operate at a sensor temperature that is higher than the case or ambient
temperature.
When heating is enabled, the TEC does not need to switch down to a temperature
setpoint that is below the current setpoint. As long as the case temperature is
below the sensor temperature, the TEC keeps heating the sensor.
Figure 73: Schematic figure of setpoint switching downwards
0
10
20
30
40
50
60
Temper
atur
e in
°C
Time
Case temperature
Sensor temperature
Setpoint 1
Setpoint 2 (Default)
Setpoint 3
Setpoint 4
Min.
ȴ
T reached
Min.
ȴ
T reached
