Analog Output<\/strong>: A continuous voltage signal proportional to the amount of infrared detected, as opposed to a digital on\/off output.<\/p>\n Angular Coverage<\/strong>: The horizontal angle over which the sensor can detect motion, typically 90\u00b0 to 180\u00b0.<\/p>\n Black Body Radiation<\/strong>: The electromagnetic radiation emitted by an object due to its temperature. Humans emit black body radiation peaking around 9.7 \u03bcm.<\/p>\n Block Time<\/strong>: The period after a detection during which the sensor ignores further motion, also called lockout time.<\/p>\n Common-Mode Rejection<\/strong>: The ability of a differential sensor to cancel signals that affect both elements equally, such as ambient temperature drift.<\/p>\n Curtain Lens<\/strong>: A Fresnel lens that creates a narrow, long-range detection pattern, like a curtain.<\/p>\n Detection Range<\/strong>: The maximum distance at which the sensor can reliably detect motion.<\/p>\n Digital Output<\/strong>: A binary output (HIGH\/LOW) indicating motion detection.<\/p>\n Dual Element<\/strong>: A sensor containing two pyroelectric elements connected differentially.<\/p>\n EMI (Electromagnetic Interference)<\/strong>: Electrical noise that can cause false triggers in PIR sensors.<\/p>\n False Trigger<\/strong>: A detection event caused by something other than intended motion, such as a heat source or electrical noise.<\/p>\n Fresnel Lens<\/strong>: A compact lens that focuses infrared onto the sensor element and defines the detection pattern.<\/p>\n Gain<\/strong>: The amplification factor applied to the raw sensor signal.<\/p>\n Hold Time<\/strong>: The duration the output remains HIGH after motion is detected, also called delay time.<\/p>\n Hysteresis<\/strong>: A built-in margin to prevent output oscillation near the threshold.<\/p>\n Infrared (IR)<\/strong>: Electromagnetic radiation with wavelengths longer than visible light, from about 0.7 \u03bcm to 1 mm.<\/p>\n JFET<\/strong>: Junction Field Effect Transistor, often used as an impedance converter in pyroelectric sensors.<\/p>\n Lens<\/strong>: See Fresnel lens.<\/p>\n Lockout Time<\/strong>: See Block time.<\/p>\n Microwave Sensor<\/strong>: A motion sensor that uses Doppler radar, often combined with PIR for dual-technology detectors.<\/p>\n NEP (Noise Equivalent Power)<\/strong>: A measure of sensor sensitivity; lower NEP means better sensitivity.<\/p>\n Open Drain Output<\/strong>: An output that requires an external pull-up resistor, common in some PIR sensors.<\/p>\n Passive Infrared (PIR)<\/strong>: A sensor that detects motion by measuring changes in infrared radiation, without emitting any energy.<\/p>\n Pet Immune<\/strong>: A sensor or lens designed to ignore small animals.<\/p>\n Potentiometer<\/strong>: An adjustable resistor used to set sensitivity or delay time.<\/p>\n Pyroelectric Effect<\/strong>: The generation of an electrical voltage by a material when heated or cooled.<\/p>\n Repeatable Trigger<\/strong>: A mode where the hold time resets with each new motion event.<\/p>\n Sensitivity<\/strong>: The sensor’s ability to detect small motion or distant objects.<\/p>\n Shield<\/strong>: A metal enclosure that protects the sensor from EMI.<\/p>\n Threshold<\/strong>: The signal level above which motion is declared.<\/p>\n Time Delay<\/strong>: See Hold time.<\/p>\n Voltage Comparator<\/strong>: A circuit that compares the sensor signal to a threshold and produces a digital output.<\/p>\n Warm-up Time<\/strong>: The period after power-up during which the sensor stabilizes and may produce false triggers.<\/p>\n Wavelength<\/strong>: The distance between successive peaks of a wave; for IR, typically measured in micrometers (\u03bcm).<\/p>\n Zone<\/strong>: A detection region created by the Fresnel lens. A PIR sensor typically has multiple zones.<\/p>\n This glossary will be updated regularly. If you have a term you’d like added, please contact us.<\/p>\n","protected":false},"excerpt":{"rendered":" A Analog Output: A continuous voltage signal proportional to the amount of infrared detected, as opposed to a digital on\/off output. Angular Coverage: The horizontal angle over which the sensor can detect motion, typically 90\u00b0 to 180\u00b0. B Black Body Radiation: The electromagnetic radiation emitted by an object due to its temperature. Humans emit black […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1010","post","type-post","status-publish","format-standard","hentry","category-reference"],"blocksy_meta":[],"yoast_head":"\r\nB<\/h2>\n
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