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Recording Systems



TET / BIROS sensor system (flight model)
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Schematic of TET/BIRO sensor assembly with camera system
 

The main payload is an infrared system consisting of three camera modules for quantitatively analysing high temperature events. The capabilities of the basic configuration were already confirmed in the BIRD mission. The camera system has three physically independent line scan cameras: one for the visible and near-infrared range and two cameras recording in the mid-infrared and longwave infrared ranges, each with its own power supply and command and data interfaces.

This guarantees functional independence in case one of the modules fails. It offers many possibilities to optimize various measurement tasks as well. For example, it is possible not to turn on the multi-function camera for night-time recording in order to relieve the power and thermal regime. Mechanically, all cameras are mounted on a common optical bench, which optimally supports the mutual alignments necessary for operations. The cameras are also coupled via internal interface circuitry so that they can be reciprocally synchronized. The circuits are passive when a module is not connected in order to preserve the principle of independence and to avoid error propagation.
 

Camera Parameters

  VIS (three CCD lines FPA) 2 IR Cameras (different spectral ranges)
Wavelengths 0.5 µm, 0.6 µm, 0.8 µm green, red, NIR MWIR: 3.4 - 4.2 µm
LWIR (TIR): 8.5 - 9.3 µm
Focal length 90.9 mm 46.39 mm
Field of View 19.6° 19°
F number 3.8 2.0
Detector type CCED linear array CdHgTe linear array
No of pixels 3 x 5164 2 x 512 staggered
Data quantization 14 bit 14 bit
Ground pixel width 42.4 m 356 m
Sample width 42.4 m 178 m
Swath width 211 km 178 km
In-flight calibration None Use of a movable calibration flap

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