The Science Behind Car Alarms

The Science Behind Car Alarms

For most people, their car is one of their most valuable possessions. This is the very reason why cars have always been a target for thieves. In fact, the first car theft was documented in 1896, which is a decade after the invention of gas-powered cars.

Aside from this, there are also studies that claim that in the United States one car gets broken into by thieves every 20 seconds.

With these findings, it is not surprising that many car owners also invest in buying alarm systems no matter how expensive they can be. Today, it is normal for every car to be equipped with these advanced sensors with blaring sirens and remote activation technology.

But have you ever wonder how car alarm systems work? What are the other things that this sophisticated car accessory can do?

In this article, you learn about modern car alarms and find out how advanced and elaborate can they be. You will be amazed at how expert car thieves still find a way to get past them too.

The Basic Function of Car Alarms: The Science Behind Car Alarms

If you want to understand how car alarm systems work you should start with their basic functions. In its simplest form, a car alarm is made with one or more sensors that are connected to a device or siren.

The first versions of this technology were often found on the driver’s door. There is a wired switch that is connected to the siren so that when someone breaks in or opens the door, the siren will sound. This system is simple because you only need a switch, some wires and a siren to make it.

As time went on, car alarm manufacturers started to implement innovative features for modern cars. Car alarms these days contain more than just sensors. They can also do the following:

  • Detect motions using different kinds of sensor including switches, pressure sensors, and more
  • Provide a variety of sound or siren options so that you can choose a distinct sound for when your car alarm sounds
  • Allow wireless control from a key fob through a radio receiver
  • Continue operating even when the main battery gets disconnected through the help of an auxiliary battery

Aside from these, there is also what they call the “brain of the system” that is responsible for monitoring every feature and activating the alarm. The brain is just a small computer but it has the ability to control advanced features or functions.

It closes the switch for alarm devices such as the horn, headlights and siren when the switches that activate sensing devices are turned on or off.

In many cases, security systems vary in the kind of sensors and how they are connected to the brain.

How Do Car Alarms Prevent Robberies?

Manufacturers know that thieves will still break in regardless of what type of car alarm you may have. To add an extra protective layer for owners, they have added other alarm features that use not just the car’s main battery but other backup power sources as well.

This way, when a thief cuts off the main power source by clipping battery cables, the backup battery will kick in.

The act of cutting the power is a possible indication of an intruder. Thus, the brain will be triggered to sound the alarm.

Basic Parts

Door sensors

Door sensors are a basic element or part of a car alarm system that normally use a switching mechanism that is already built into the car doors.

Opening the door or the trunk of an ordinary car will turn on the inside lights. Meanwhile, opening the same parts of a fully protected car triggers the alarm system.

Shock sensors

Shock sensors work in a very simple way. When something or someone hits or moves your car, the sensor automatically sends a signal to the brain.

It will indicate the intensity or shock level of the motion. The brain will then assess the severity and signal a warning horn beep or full-scale alarm.

Window and pressure sensors

These sensors detect breaking glass through measuring air-pressure variations or fluctuations and converting the pattern into a fluctuating electrical current. Once the microphone detects the distinctive sound frequency of breaking glass, it sends a signal to the brain.

Click here to add a comment

Leave a comment: