Photoelectric sensors are one of the most well-known security systems we are used to seeing in adventure movies. You remember the heroes of spy agents trying to get through them without touching the red streaks of light. However, rays that we see as red light beams in movies are used in real life by making them invisible. Photoelectric sensors may seem an old technology, however, it is still in use in many home security systems.
What Are Photoelectric Sensors?
Photoelectric Sensors and Photoelectric detection systems use a light-sensitive cell and a directed light source that points directly at the cell. Photoelectric security systems can be classified as motion detection systems since an object or person must move across the photoelectric connection to break the light transmission to the sensor.
How Do Photoelectric Sensors Work?
The source transmits invisible light beams to the adjacent cell or sensor. Often an infrared filter covers the light source to make it non-visible to intruders. If an intruder crosses the light beam, it breaks the beam’s continuous contact with the photoelectric cell and trips the alarm. Mirrors can be installed with photoelectric security systems in order to allow one light beam to be projected across a large area, thus allowing a crisscrossing of the light beam across a room. This makes it much more difficult for an intruder to crawl under, or step over the light beam.
Where are these types of sensors used?
Photoelectric Sensors are more useful for security breaches such as crossing a specified line rather than protecting a specific area. Such areas can be at various points in the house. For example, if someone enters through the garden gate or if there is an entrance from the back door, the system can be activated. Or, windows that are left open, stairs, and the upper edges of garden walls are also suitable places to use these devices.
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