Temperature control
237
Goldeye G/CL Technical Manual V4.2.0
If required to keep the sensor temperature stable, the TEC automatically switches
from heating to cooling, or vice versa.
During operation, as long as the TEC does not actively cool the sensor, the sensor
temperature usually is higher than the case temperature. So, even if the sensor
temperature is below the current temperature setpoint, the TEC might still be
required to cool the sensor. The green arrow in
shows this situation Note
for better understanding the case temperature profile is shown in a simplified way
that covers the whole temperature range.
The ability to switch to a higher setpoint, however, depends on the feature
(
Reg
)
SensorTemperatureSetpointMode
:
•
Set to
Auto
, the TEC is able to switch to a higher setpoint, if it exists, as shown
.
•
Set to
Manual
, the TEC is not able to switch to any other setpoint.
Switching the sensor off
If the internal camera temperature exceeds a preset alert limit, the camera‘s
overheat protection circuit powers down the sensor board. This also includes the
sensor cooling.
The Alert state is indicated by a continuous red light of the temperature status LED.
Temperature setpoint settling time
If the setpoint of the sensor temperature controller is changed, it takes
approximately half a minute until the desired temperature is reached. During this
period, the image quality may be reduced to some degree.
Figure 74: Schematic figure of TEC heating and cooling
0
10
20
30
40
50
60
Te
m
p
e
ra
tu
re
i
n
°
C
Time
Case temperature
Sensor temperature
Setpoint 1
Setpoint 2 (Default)
Setpoint 3
Setpoint 4
TEC switching point
