e2v technologies (uk) limited 2013 CR 114528 05 Apr 2013 DAS775571AA Version 1, page 15
• Heat Layers in Closed Spaces
In a major fire, a layer of hot gases may build up in the upper region of
the closed space. Attempting to use the camera in this hot layer will
cause the image to become featureless. By bringing the camera down
beneath this layer, the unit is able to provide the fire-fighter with a clearer
picture of the scene ahead.
• Windows and Polished Surfaces
Glass is not transparent to long wavelength infrared energy and it is not
possible for the operator to use the camera to look through a window. A
white window would indicate that the window itself is relatively warm and
may be being heated by a fire behind it. Just as we see reflections in
glass under normal circumstances, it is possible that the camera can
detect infrared reflections in glass, mirrors and polished or painted
surfaces. Care must be taken to ensure that the image seen is not simply
a reflection. Experience will give the operator added confidence.
• Control of Water Streams/Jets
When viewed through the camera, water streams from hose reels will
appear black against the background scene. The control and direction of
a water flow can be monitored by viewing its flow and effect on the fire
through the camera. It may be necessary, if employing a water wall, to
drop the wall momentarily to view the effects of the extinguishing stream.
• Smoke Types
The camera will provide vision through all types of smoke and steam.
• Lens Cleaning During Operation
The camera lens, like the BA visor, may become obscured during use.
The lens may be cleaned with a glove or cloth if necessary.
To Next Page
Loading...
