Types of Motion Sensors & How They Work


Times are changing, and with the ever-evolving technology, people are progressively embracing modern innovations.

When it comes to home security, gone are the days when dogs and a simple alarm were the only sources of security. Nowadays, we can rely on a range of easy-to-use home security devices all aimed at adding affordable extra layers of security to your home. Almost everyone has motion sensors to guard our homes, businesses, and other property. Motion sensors are arguably at the top of the list because they are so easy to install, and you can take them with you whenever you move. This is especially useful for renters.

Here are a few things to consider about motion sensors and how they work.


Microwave Sensors

The microwave motion sensor technology uses microwave pulses to measure the reflections of moving objects. Once they have measured the reflections, the sensors will be able to tell whether or not the objects are moving. These kinds of sensors are very sensitive and can cover a larger target range.

However, these are not perfect. This type of sensor can see through non-metallic objects, meaning that, on occasion, they detect objects outside the targeted area. They are also prone to electrical interference and use a lot of energy.

Passive Infrared Sensors

These sensors work by detecting the infrared energy (body heat) of the surrounding environment. All warm-blooded creatures emit this kind of radiation.

Once the system is armed, the motion sensors are activated by electricity. Then, when a person or animal enters the targeted area, the sensors increase the temperature and create a protective grid.

When an intruder comes back and continues to trespass various grids, the motion sensors will eventually trip the alarm. This type of sensing technology is very common in home security systems and indoor alarms. They are easily affordable and will last longer.


Ultrasonic Sensors

Almost like microwave motion sensor technology, ultrasonic sensors use ultrasonic waves to measure the reflections of moving objects. They are also very sensitive and can either be passive or active. Whereas passive ones are keen for specific sounds like glass breaking, active detectors emit very high and unsettling sound waves to scare away intruders.

Dual Technology

This technology is teamwork of both ultrasonic and passive infrared technologies.

Dual-tech motion sensors are often accurate, and that is why they are always preferred by big business owners and learning institutions. For the alarm to be tripped, both sensors must be triggered. This is the difference between false alarms and an actual intrusion.

Although the two combining technologies operate in different areas of the spectrum, they remain linked with each other and work in tandem. However, this dual trigger can fail to detect real alarms.

Photoelectric Sensors

This motion sensor technology relies on a focused beam of energy traveling between a sensor and an emitter unit.

Therefore, when something moves between this unit of light, it interrupts the beam and triggers the motion sensors. More expensive sensors will use invisible infrared energy for this technology.

One downside of photoelectric sensors is that they are prone to false alarms.


Get in Touch With Local Experts

Burglars look at your home in many different ways and notice things you might ignore. The only way to figure out what motion sensors will work best for you is to get in touch with some local professionals and discuss your options.

Take advantage of their local expertise and input so that you can make the best choice for your particular home security needs.