Security system - research

Page last updated 22 Jan 2010, by Alex Louden. 0 replies door, locks, research, security system

Door locks

Strike:

Installed into architrave, apply power to unlock so door can swing freely. (fail-secure)

Use with existing handle

Cheap ($50)

12v or 24v control

Electromechanical lock:

Drop bolt:

Bolt in / out.

Install into architrave, can either have power to lock, or power to unlock. (fail-secure, or fail-safe)

Monitor door position with inbuilt reed sensor

Up to 2000kgs force.

V-Lock:

Rotates bolt from vertical, instead of slide. 1000kgs.

Technilock:

Uses a metal semi-circular bolt. 70kgs side, 2500kgs front.

Hook:

Hook from architrave side into door. Suitable for sliding and swinging doors. 300kgs side, 680kgs front.

Electromagnetic lock:

150 to 1300+ kgs holding force.

Typically install on top of architrave, and metal plate on door.

Door strength:

Apparently 65-75% of burgularies are by forcing doors.

Solid timber door ~ 50kgs, 1 blow.

Steel edged ~ 50kgs, 7 blows.

Sensors

Door:

Reed switch (open/closed)

Piezo (knock/hit)

Window:

Reed switch (slide)

Piezo (knock/hit)

Glass break sensor (smash)

Interior:

Beam: Must physically break beam to trip sensor. One side IR light and other photoelectric sensor.

PIR: Looks for body heat. No energy is emitted from the sensor. More sensitive for lateral motion.

360 degree ceiling mounted

110 degree corner wall mounted

Ultrasonic: Sensor sends out pulses and measures the reflection off a moving object.

Microwave: Active - sends out microwave pulses, measures frequency of returning pulses for doppler effect. Penetrates through walls, can be placed behind objects. More sensitive for forward/backward motion.

Acoustic: Trips on loud noises and particular patterns such as breaking glass. Prone to false alarms.

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