Design of the camera modules
The camera module is mounted on a pneumatic drive (see picture2 below).
The objective and the camera module can be actively retracted (by the use of compressed air: 6 bar) into a borehole >15mm which is located in a ligament of the boiler.
The cooling air (20°C 25°C; 100mBar excess preassure; 1qm per minute) is being fed by a tube of 75mm diameter.
For the protection of the IEEE 1394 pilotages and the hubs that require working temperatures of about 20°C 25°C as well, they can also be dissipated via the air duct.
The inflowing cooling air firstly circulates around the camera module ,and then it is partly blown out backwards around the drawer (lid is taken off in the first picture). This part cools the drawer and the casing.
An other part of the cooling air can be used for rinsing and cooling the objective. This process can also result from an independent air supply by the installation of a purge air adapter.
Pictures 2-4 show the modules of the combustion analysis cameras. As required different objectives can be used.
Core of the system is the combustion analysis camera, that records the furnace of the burners in different spectral regions.
The two CCD-camera heads of the camera module take pictures of the combustion zones in variable frequency ranges. According to requirements different objectives are being employed (see picture below).
The image data is transmitted to the data analysis unit or rather to the next hub by two IEEE 1394 (firewire) cables, that also assume the electricity supply of the camera heads.
The temperature distribution and the transparency among the flame and the sensor is being calculated from the spectral intensities emitted by the flame.
Both magnitudes are continued to be used as correction factors or rather for the generation of error messages
picture 1:drawer of the combustion analysis camera (lid taken off)
picture 2: pneumatic sliding unit (left), camera module (right) and
wide-angle lens ;aperture: 12mm (right front)
The objective of 12 mm aperture features a viewing angle of about 90°.
picture 3: camera module and wide-angle lens of 28 mm aperture
The wide-angle lens of 28 mm aperture features a viewing angle of about 175° in theory. Practically due to distortion and dimout - a viewing angle of about 120° can be used.
picture 4: drawer of the combustion analysis camera
picture 5: combustion analysis camera
picture 6: combustion analysis camera (mounted)