Ultrasonic sensors for home security systems


Ultrasonic sensors are a type of motion sensors. It uses frequencies around 30khz. These sounds are inaudible to humans but are audible to dogs and they may find them annoying.

Sound waves were emitted from a sensor and the resulting reflected sounds were analyzed to detect changes. Ultrasonic sensors engage when they detect a change in ultrasonic frequencies caused by motion in a space. It is only through movement that an ultrasonic sensor is triggered.

There are limitations that affect their use in home security settings. Jingling keys and ringing telephones may set off the alarms. Since ultrasonic sensors don't detect very fast or slow moving objects, an intruder could hide behind an object and move across the sensor's viewable area and not set off. The disadvantage of ultrasonic sensors is that they don't work well in rooms with wall to wall carpeting and drapery. The sound waves from the transmitter get absorbed by these materials and are too weak to return to the sensor. Ultrasonic sensors were used in alarms system back in the 70's and because of the constant false alarms caused by this sensor; it has been rendered obsolete and replaced by a more reliable sensor such as the infrared sensor.



 


Table Of Contents

How an alarm system works
Find out how an alarm system works and understand the difference between closed-circuit and open-circuit system

Control Panel
The brain of a home security system

Keypad
Keypad for home security systems

Sensors
- Motion Sensors
- Glass Break Sensors
- Magnetic Sensors
- Smoke Sensors
- Ultrasonic Sensors
- Microwave Sensors

Respond
Type of responds of a home security system

Connection
Type of connection of a home security system

DIY home security system
Guide to DIY home security system

Driveway Alarm
Your car is at home but is it safe? Is it protected by a driveway alarm?

ADT Home Security System
Home Security System Monitored By ADT

Wireless Motion Activated Security Camera
The best alternative to the conventional security camera

What Features to Look for When Purchasing a Home Security System
Guide To Purchasing a Home Security System

 

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