Usually at these high line rates (>100 Hz) a cooling does not have a benefit. At these frequencies the read noise is the limiting factor for the dynamic range. Only if the sensor must be used with longer exposure times, a cooling make sense. Here the dark noise (accumulated generated electrons by heat) will start to degrade the dynamic range. Also if the FFT sensors are not used in binning mode, it could be an advantage to use the cooled version. Here the read time of a complete frame can reach 1 Hz or more. Only the extended IR sensors (1-2.5 µm series G1147x must be cooled. Here the dark noise and the number of defective pixel is higher then at the standard type (1-1.7 µm).
The cooling can decrease the temperature dependent dark noise of the sensor up to 1000 times. So the exposure time and therefore the sensitivity can be increased for cw signals by this factor. The thermo electric cooling is managed by one ore more Peltier elements and the temperature is stabilized by a build in controller. A heat sink with a fan is used to emit the heating power.
Cooling Series FLPC3000
The cooled cameras are stand alone systems and do not need a CamControl unit. The Hamamatsu sensors of series FLPC3000 are already available in a sealed and dry case. These sensors can be mounted directly to a heat sink, as they have one or more build in Peltier elements. These are mounted directly under the photo sensitive elements and can therefore cool them very efficiently. Additionally the case is filled with dry nitrogen so that no condensate at the window is possible. This system needs no maintenance at all.
The temperature control is implemented in the camera case and can be setup by the computer. Only an external power supply is needed. The cameras can be chained to other cameras of series 3001 and to our IOControl as well.
|cooled CCD-Arrays (FFT's)|
|'Back thinned FFT-CCD' S7031, VIS: 200 - 1100nm|
|S7031-||[mm]||[µm]||h x v|
|906||12,29 x 1,39||24||512 x 58|
|907||12,29 x 2,93||24||512 x 122|
|908||12,29 x 6,00||24||512 x 250|
|1006||24,58 x 1,39||24||1024 x 58|
|1007||24,58 x 2,93||24||1024 x 122|
|1008||24,58 x 6,00||24||1024 x 250|
|cooled Photo Diode Array (PDA's)|
|S5930||50 x 2500||50||256/512|
|S5931||25 x 2500||25||512/1024|
|cooled IRs (InGaAs) with extended sensitivity up to 2.55µm|
|Sensor||Pixel size||pitch||Pixel||spectral response|
|G11475||25/50 x 250||25/50||256/512||0.9-1.85|
|G11476||50 x 250||50||256||0.9-2.05|
|G11477||25/50 x 250||25/50||256/512||0.9-2.15|
|G11478||25/50 x 250||25/50||256/512||0.9-2.55|