6
1.4.1.2 Directional Control
Directional control is provided for both the elevation and azimuth axes
through a full 360 range of motion. The operator controls this
movement with the HCU Strain Gauge, which in turn sends a digital
signal to the CEU. The CEU then generates and transmits a signal to
the appropriate torque motor in the SGA.
1.4.1.3 Forward Looking Infrared Camera
The IR camera operates in the 3.4 to 5.0 micron (3.4 – 5.0μm)
wavelength region and is fitted with continuous zoom lenses that provide
a zoom range of 10:1 from 25mm through 250mm. The magnification of
the resulting image is up to 10 times. As the magnification increases, the
resolution increases so image quality degradation does not occur at
higher magnifications.
The IR detector (or imager) is the heart of the SeaFLIR II Imaging
System. The detector is an Indium Antimonide (InSb) Focal Plane Array
(FPA) operating at cryogenic temperatures (77K). The array is
integrated into a miniature dewar/cooler. FPA technology does not
require a mechanical scanning mechanism, as do some thermal
imagers. Instead, a mosaic of 76,800 discrete detectors, arranged in a
pattern of 320 by 240 elements (pixels), is used. Each element appears
as one point, or resolution element, in every image. Unlike a
conventional imager where a single detector element or a small array of
detectors is rapidly scanned over the entire scene, each element in the
FPA stays ”on” or "stares" continuously at the scene. This allows the
FPA to receive a larger number of infrared photons thus providing a very
high thermal sensitivity. Performance characteristics of the IR camera
are listed in Table 1-2.
Table 1-2. Infrared Camera - Standard Configuration
Parameter Capability
Sensor 320 x 240 pixel InSb FPA
Operating Wavelength 3.4 to 5.0 microns (3.4 – 5.0μm)
Zoom capability 10x continuous zoom
Nominal Field of View (FOV)
2.2 (H) x 1.7 (V) Narrow
21.7 (H) x 16.4 (V) Wide
Effective Focal Length, f/# 25mm to 250mm, f/4
Commercial in Confidence
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Issued to: AgustaWestland
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Retrieval Date:07-Dec-10
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