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* as React from 'react'\n /* @jsx mdx */\nimport { mdx } from '@mdx-js/react';\n/* @jsxRuntime classic */\n/* @jsx mdx */\nimport { Link } from 'gatsby';\nimport { EuiSpacer } from '@elastic/eui';\nimport NavButtons from 'components/Motion_Detection/NavButtons';\nimport PrimaryBox from 'components/Motion_Detection/Passive_Infrared_Detection/PrimaryBox';\nimport ForumBox from 'components/Motion_Detection/FTP_Server_Setup/ForumBox';\nimport BreadCrumbs from 'components/Layout/BreadCrumbs';\nimport SEOHelmet from 'components/Layout/SEOHelmet';\nexport const _frontmatter = {\n \"title\": \"Passive Infrared Motion Detection\",\n \"path\": \"/Motion_Detection/Passive_Infrared_Detection/\",\n \"dateChanged\": \"2021-06-30\",\n \"author\": \"Mike Polinowski\",\n \"excerpt\": \"Use your camera's PIR Sensor to minimize the risks of false alerts by light changes.\",\n \"image\": \"./MD_SearchThumb_PIR_Sensor.png\",\n \"social\": \"/images/Search/MD_SearchThumb_PIR_Sensor.webp\",\n \"toc\": \"/images/Search/TOC_Icons/Wiki_Tiles_MD-Motion-Detection-Setup_white.webp\",\n \"chapter\": \"Motion Detection\"\n};\nconst layoutProps = {\n _frontmatter\n};\nconst MDXLayout = \"wrapper\";\nexport default function MDXContent({\n components,\n ...props\n}) {\n return \n\n\n\n \n \n \n

{`Passive Infrared Sensors`}

\n

{`Body Heat Detection`}

\n

{`Most INSTAR cameras now come with an pre-installed passive infrared (`}{`PIR`}{`) sensor. PIR sensors detect changes in temperature in window of surveillance in front your camera. This can be the heat that is emitted by your body, or the hot engine bonnet of your car, in form of IR radiation. This radiation has wavelengths between `}{`1 µm`}{` to `}{`1,5 mm`}{` with a peak of emission around `}{`10 µm`}{` and is invisible to the human eye.`}

\n

{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}

\n

{`Passive infrared sensor see the moving heat signal through a so called Fresnel lense that divides the field of view of the sensor into small windows - depicted as rectangular beams in the sketch above. A simple PIR sensor will trigger an alert once it \"sees\" a hot object leave one window and enters a neighbouring window. More sophisticated sensors apply small programs that allow them to rule out background \"noise\" as alarm triggers`}

\n
\n

{`The sensor is always more sensitive when they are installed in a way that you are forced to walk past them (upper graphic on the right) instead of walking toward them (lower graphic on the right).`}

\n
\n

{`Always install your sensors not in front of an entry by at a 90° angle to the side of it. This forces you to walk through all detection windows. Making sure that you definitely reach the trigger threshold for the alarm detection. It is also recommended to install your sensor close to the ceiling as the installed Fresnel lenses are designed to \"look\" down. The installation close to and especially above a heat source can cause false alerts and has to be avoided.`}

\n \n \n \n

{`Keep in mind that the world that your PIR sensor sees looks very different from what your eyes see. There are many potential downfalls with installing a PIR sensor in the wrong place or needing it to operate at the wrong time of the day.`}

\n

{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}

\n

{`The safest way to operate your INSTAR camera is to couple both the internal, software-based motion detection and the PIR motion sensor. By activating the sensor coupling in the `}{`Alarm/Actions menu`}{` an alarm is only triggered when both detection methods agree that there is something going on that is worth reporting.`}

\n

{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}

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