| A motion sensor alarm is an exceptional way of | | | | range. Passive sensors usually operate in the Infrared |
| securing your possessions. They work by constantly | | | | wavelength range. |
| monitoring a specific area for uneven wave forms. It | | | | Various types of sensors are used in sensor alarms |
| can be used in a number of ways keeping in mind the | | | | such as Photoelectric, Ultrasonic, Infrared and |
| requirement of the person who installed it. For | | | | Acoustic sensors. Photoelectric sensors work on the |
| instance it can be used to stop intruders from | | | | phenomena of projecting a beam between |
| breaking in. It can also be used to observe the | | | | passageways usually. If the beam is cut by an object |
| movement of pets or animals both indoor and | | | | the alarm rings off. Ultrasonic sensors help in motion |
| outdoor respectively. Thus, every version has to be | | | | detection by monitoring echoes of waves that |
| tailored and calibrated according to the need. | | | | bounced back off objects. However, this method is |
| These sensors can be implemented and configured | | | | by far outdated presently. The most popular method |
| easily these days. The end user has the provision of | | | | these days is that of infrared sensors which relate to |
| having it pre-programmed to turn on and off | | | | temperature changes, heat emissions usually, from |
| automatically. When the alarm goes off the user has | | | | human beings and animals. Finally, acoustic sensors |
| to turn it off manually via the controller by entering a | | | | record sounds of movements in the area being |
| password or in some cases through a remote control. | | | | scrutinized. |
| This alarm conventionally consists of a sensor, | | | | Sensor alarms are quite efficient in terms of power |
| controller and an output device. The sensor is used | | | | consumption as they require a few batteries to scare |
| for observation, the controller controls the activation | | | | off the intruders. They are compact, reliable and |
| and deactivation of the system and the output | | | | most importantly long lasting. The best thing about |
| device can either be an alarm bell or a motion sensor | | | | sensor alarm systems nowadays is that designers |
| camera. Motion sensors can be divided into two | | | | have incorporated a feature which enables it to |
| categories namely, active motion sensors and passive | | | | transmit an emergency situation to the security |
| motion sensors. The former emits a field of its own | | | | support service or the local police department in |
| whereas the latter does not. Active sensors normally | | | | order to ensure timely rescue and highest level of |
| function in the ultrasonic and microwave wavelength | | | | security. |