For the purpose of detecting motion, infrared sensors use infrared wavelengths. Although there are many uses for IR sensors, they are most frequently utilised in security systems installed in homes and businesses.
Active infrared (AIR) sensors and Passive infrared (PIR) sensors, often known as infrared detectors, are the two types of infrared sensors. Our comprehensive reference to AIR sensors is solely for infrared beam sensors, also known as photobeam sensors, which use Active Infrared (AIR) to detect motion.
Active infrared (AIR) sensors are the kind of sensors that use a transmitter to send out infrared radiation that are then picked up by a receiver. Any change in the waves' path shows the presence of an object.
Working of Beam Detectors :
- The transmitter emits an infrared beam that travels in a straight line thanks to an infrared LED inside of it.
- The IR waves travel in a straight line from the transmitter to the IR receiver, which is located directly across from it, through the transmission medium, which is typically air.
- The photodiode in the receiver is used to assess the approaching IR waves.
- The receiver is equipped with an amplifier that amplifies the received signal in order to enable proper analysis because the waves that are sent to the receiver are of low frequency.
- Up until an object or person disturbs it, the transmitter and receiver cycle continues as a regular process of the beam detectors.
- The photodiode experiences a change in the intensity of the IR waves it is receiving when it is disturbed by any object or person.
- The photodiode detects this change in intensity right away and, in accordance with its settings, sends a signal to the control panel to alert it to any potentially suspicious activity
Applications :
- Home Security System
- Anti Theft Alarm
- Intrusion Detection System
- Home Alarm System
- Human Sensor
- Perimeter Protection System
- Burglar Alarm System
