Most situations today require a complete safety/security plan. The plan should contain requirements for intrusion detection, video assessment, fire detection, access control, and full two-way communication. Critical functions and locations must be monitored using wired and wireless backup communications. The most significant driving force behind the explosion in the use of closed-circuit television ( Wireless Security Camera System ) has been the worldwide increase in theft and terrorism and the commensurate concern and need to protect personnel and assets. The terrorist attack on September 11, 2001, brought about a quantum jump and a complete reevaluation of the personnel and asset security requirements to safe-guard a facility. To meet this new threat, video security has taken on the lead role in protecting personnel and assets. Today every state-of the-art security system must include video as a key component to provide the “remote eyes” for security, fire, and safety.
Installation and maintenance of video equipment requires the use of video and computer test equipment. Prior to the widespread use of digital technology in security systems, a limited range of test equipment was used. Now with the many computer interfaces and Internet protocols and connection to the Internet, more sophisticated test equipment and some knowledge of software and computer programming is necessary. Parameters to be tested and monitored include: (a) video signal level and quality; (b) control data signals for pan, tilt, zoom, focus; and (c) digital signal protocols for multiplexers, Wireless IP Camera , signal routers and servers, DVRs, etc.
The CRTs are coated on the inside with a phosphor layer that, when bombarded with electron beams, converts the kinetic energy of the electrons into light radiation. Different compositions of phosphor produce different colors. This is defined as the phosphor spectral characteristic. For a monochrome (or B/W) CCTV system, a phosphor layer that produces neutral color is used. Color CRTs use a mosaic of three different phosphors that produce red, green, and blue, that are called primary colors. These are little pixels (limited by the physical size of the mask) that, when viewed from a distance, mix into a secondary (resultant) color. It has been proven that with the red, green, and blue primaries the majority of natural colors can be simulated. This kind of color mixing is called additive mixing because light is added by each of the primary components to produce the resultant color.
There are a few different technologies available for making color CRTs, based on how red, green, and blue phosphor elements are arranged. Some of these are patented technologies, such as the popular Sony’s Trinitron. The other two common ones are the “In-line” as shown on the representation on the previous page and the “Delta” as shown above. These technologies are used in CCTV Rear Mirror Camera , but also in computers. The maximum resolution that can be reproduced is defined first by the smallest RGB elements, which make a color dot, and their arrangement. This is usually specified in the CRT technical data as dot-pitch. Current technology produces the smallest dot-pitch of around 0.21 mm. This then indirectly defines the smallest CRT screen size with a given resolution. This is one of the reasons small color monitors, for example, do not come in high resolution.
More information at http://www.jimilab.com/ .