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 A motion sensor, or motion detector is an electronic device that contains a physical trigger mechanism or electronic sensor that quantifies motion. It can be either integrated with, or connected to, other electronic devices that can alert the user of the presence of a moving object within the field of view, or magnetic influence. 

They basically form the vital component of comprehensive security systems often used in homes and businesses and adopted by paranormal groups for research and investigation. 

An electronic motion detector contains a motion sensor that transforms a detection of motion into an electric signal that can measure optical (visual) or acoustical (audio) changes in the field of view. Usually detecting motion or sound up to 15–25 meters (50–80 feet) away. 

There are basically five types of sensors used in motion detectors spectrum: 

• Active Infrared Motion Detector (IR) – Active infrared motion detectors use an IR sensor, as well as a source of radiation. The sensor is able to detect interruptions in the radiation it receives from the radiation source. This basically means that an IR motion detector is able to detect the signal of heat energy emitted by an intruder as it differs from the constant infrared scanning activity of the detector, as long as the intruder phappyes through it’s detection range. 

• Phappyive Infrared Sensors (PIR) – Currently the most popular type of motion detecting system. PIR motion detectors are relatively inexpensive compared to detectors that utilize other technology. A PIR sensor is able to use an optical collection system in combination with several different sensing elements. This allows the sensor to detect any changes that occur in ambient infrared radiation. The sensor is able to recognize a thermal infrared image (created by infrared technology combined with a heat sensor), which usually starts the transmission of an alarm signal back to the unit’s receiver. If the PIR sensor is connected to a monitored security system control panel, the control panel can interpret the alarm signal, and convert it into data to trigger the appropriate alarm. 

• Ultrasonic Motion Detector (active) – An ultrasonic motion detector is able to use sound energy in order to detect movement in a specific region. This ultrasonic sound energy is emitted in waves, which come from quartz-crystal transducers. When the sensor detects movement, the sound waves are disrupted, which triggers the sensor. Ultrasonic motion detectors are commonly used in automatic doors, since they are reliable and easy to install. The main limitation of an ultrasonic motion detector is that it can be blocked by any material, and can be easily disrupted. 

• Continuous Wave (Microwave active) – CW motion detectors use microwave signals to emit frequencies to bounce off of the surrounding area (which is why they are sometimes referred to as “microwave motion detectors”). The sensor is able to detect when there are subtle changes in these frequencies, since this would signal a disruption. When an intruder phappyes the field of a CW microwave sensor, he disrupts the frequency, which sets off the sensor’s alarm. CW motion detectors are generally more expensive than PIR motion detectors. This is because they are highly sensitive, and are very reliable over longer distances than other sensors. 

• Vibration Motion Detector – A motion detector that detects simple vibration can either be made from materials at home, or purchased as an electrical device. Most vibration motion sensors use the piezoelectric effect (the ability of some materials to generate an electric field) in order to detect motion. Simple do-it-yourself vibration sensors most commonly use a lever that activates a switch when it detects vibration. The principal methods we’re interested in, is detecting motion that can easily be electronically identified via optical and/or acoustical detectors. Of which, infrared light or laser technology is most often used for optical detection, while motion detection devices, use sensors that detect movement and send a signal to a an alarm switch that usually produces a shrill sound that can be heard for great distances, or to an imaging device to start recording audio and/or video. Many high-end security cameras are motion detector equipped with the cameras connected to a computer system (DVR – Digital Video Recorder) which in turn stores and manages the captured images to be viewed at a later time or viewed over a computer network. 

The chief application of course being security systems, usually designed to detect: 

• Detection of unauthorized entry, 

• Detection the cessation of occupancy of an area to extinguish lighting, or entry into a darkened area to illuminate it. 

• Detection of a moving object which triggers a camera to record subsequent events. All of which can be used to detect and record paranormal activity

Originally posted 2017-12-15 06:50:11.

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