By Author Unknown
A whole reference on CCTV know-how
Gives useful recommendation at the right makes use of of CCTV to top shield opposed to crime
Contains greater than a hundred photographs of the main glossy gear available.
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Extra info for CCTV Surveillance. Video Practices and Technology
A light meter calibrated in foot-candles will measure 1 foot-candle at a distance of 1 foot from that source. As shown in Figure 3-2, the light falling on a 1square-foot area at a distance of 2 feet is one-quarter footcandle. This indicates that the light level varies inversely as the square of the distance between the source and observer. CD. LUMINOUS INTENSITY (l) (1 CANDLE) ^a AREA=A=1 D=DISTANCE FROM SOURCE=2 ILLUMINATION ON SURFACE AREA=A=4 ILLUMINANCE (E) AT A DISTANCE (D) IS PROPORTIONAL TO 1/DISTANCE SQUARED , 2 E = l/D o ILLUMINANCE AT THE SCENE=LUMENS/SQUARE FOOT (FTCD) OR: LUMENS/SQUARE METER (LUX) FIGURE 3-2 Illumination defined—the Inverse Square Law level to one-quarter of its original level.
The VHS cassette format has become the standard, and the 8-mm Sony format is also popular because of its smaller size. Super VHS and Hi-8, formats with higher resolution, are used in strategic security applications. VCRs can be subdivided into two classes: real-time and time-lapse. The commercial-grade real-time recorder is similar to that used in consumer electronics, but the recorder hardware is more rugged and durable for the cont i n u o u s use r e q u i r e d in security a p p l i c a t i o n s .
The higher gas pressure retards the tungsten evaporation, allowing the filament to operate at a higher temperature, resulting in higher efficiencies than conventional incandescent lamps. To withstand these higher temperatures and pressures, the lamps use quartz bulbs or high-temperature "hard" glass. The earliest version of these lamps used fused quartz bulbs and iodine vapor and were called quartz iodine lamps. After it was found that other halogens could be used, the more generic tungsten-halogen lamp is now used.