Different Security for Different Applications

By Mary S. Preston


Security systems are available in a variety of forms, each of which is appropriate for different applications. Homes usually have one or perhaps two types working in partnership, while a business will often have a whole raft of systems working together to secure the premises.

One of the cheapest, simplest and most basic types of security is a motion sensing light. This is a bright floodlight coupled with an infrared sensor that switches on when a person approaches. Motion sensing lights are usually positioned near the front door of a home and serve to eliminate shadows in which thieves could take cover. Although not providing any physical barrier or actual warning to occupants or authorities, motion lights do provide a psychological deterrent. Because many crimes are crimes of opportunity, sometimes a small deterrent can make the difference between a break-in and otherwise.

The next step after a motion light is a security system with an alarm. Cheaper systems simply sound a tone in the building, but a quality system will alert the authorities if the alarm is not turned off within a certain timeframe. What distinguishes a good alarm system from a great one is in the details.

Often a door or window will be secured with a magnetic sensor. When the door is closed, two magnets are in close proximity - one on the door and one on the frame. When opened, the magnets separate, opening a circuit and alerting the system that there has been a break-in.

More sophisticated systems use a wire embedded in window glass. When the glass breaks, the circuit opens. These systems are obviously limited in that they can only detect a break-in if it happens at a door or window that has been protected. Because they do not actually detect the presence of someone in the building, other security systems go even further.

Infrared, microwave, ultrasonic and acoustic sensors all attempt to detect the actual presence of a burglar. Infrared and microwave sensors "see" the presence of a person in an equipped room. Both of these essentially use light that is outside the visible range for humans. When the beam of invisible light is blocked or altered by some presence, a circuit interprets this as a break-in. Ultrasonic sensors use sound outside the audible human range, similar to the sonar of a submarine or the echolocation of a bat. Although this is technically sound, it can be used to create a "visible" image and detect intruders.

Acoustic sensors use sound within the human register. But instead of operating actively, as the former three methods, sending out a signal and waiting for disturbances in the reflection, acoustic sensors listen passively. The microphone detects a sufficiently loud sound, such as the breaking of a window.

To determine which type of alarm system is appropriate, consult with a reputable alarm company. This one, specializing in Sacramento home security, would be able to provide for any security need. Security companies in Sacramento, such as Titan, are well equipped to secure any home or business.




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