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Uncooled FPA Detector thermal imaging detector Tech Specs
Perhaps the most important aspect of any surveillance camera is the distance at which an unknown (or sometimes known) object can be detected, recognized and positively identified. In order to increase these distances, the camera system design must increase the number of detector pixels on a particular target. Typically, range is limited either by the optics quality or the detector array characteristics. Thus, systems designers have improved camera range performance by decreasing pixel pitch and optical field of view to increase the “pixels-on-target.” Also, designers have improved range performance by increasing systems sensitivity by improvements to Noise Equivalent Temperature Difference (NETD) of the detectors and lowering the optics f/# only when required. The combination of better optics and more densely packeddetector pixels help to produce the optimum range performance.
Perhaps the easier technical solution is to increase range through the optical telescope design. By simply choosing a design that has magnified optical angles, the system provider can deliver a lens that yields additional range. However, when the optical magnification is increased there is requisite decrease in the field of view (FOV). Eventually, the system FOV reaches a point that results in “tunnel vision” situation – the angles become too small and even minute motion of the camera, from sources as simple as wind buffeting, will cause severe image motion and blur. The tunnel vision effect is analogous to using unstabilized binoculars at high magnification – keeping them steady becomes difficult for use even for short time periods.
Dimension (pins excluded)