Directional Control; Forward Looking Infrared Camera - FLIR SeaFLIR II Series Operator's Manual

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Table of Contents

Commercial in Confidence

Export Level 2

Issued to: AgustaWestland

1.4.1.2

Directional control is provided for both the elevation and azimuth axes

through a full 360° range of motion.

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

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 (77°K).

integrated into a miniature dewar/cooler.

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.

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

Sensor

Operating Wavelength

Zoom capability

Nominal Field of View (FOV)

Effective Focal Length, f/#

Valid on Day of Issue only.

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