The Fresnel lens is often overlooked, but it’s crucial to PIR sensor performance. Different lenses create different detection patterns. Choosing the right lens can make or break your project.<\/p>\n
The lens focuses infrared onto the pyroelectric element and divides the field of view into discrete detection zones. The pattern of these zones determines where motion is detected.<\/p>\n
Coverage:<\/strong> 90-120\u00b0 horizontal, 5-10m range. Coverage:<\/strong> Narrow (5-20\u00b0) but long distance (up to 20m). Coverage:<\/strong> Similar to wide angle but with reduced sensitivity near ground. Coverage:<\/strong> Wide angle but with more zones for increased sensitivity to small movements. Some manufacturers offer lenses for specific applications like ceiling mounting (360\u00b0), corner mounting, etc.<\/p>\n You can partially mask a lens with opaque tape to narrow its field, or use multiple sensors with different lenses to cover complex areas.<\/p>\n Don’t just use the stock lens without thought. Consider your coverage needs and choose a lens that matches. It’s a simple way to improve sensor performance.<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction The Fresnel lens is often overlooked, but it’s crucial to PIR sensor performance. Different lenses create different detection patterns. Choosing the right lens can make or break your project. What Does a Fresnel Lens Do? The lens focuses infrared onto the pyroelectric element and divides the field of view into discrete detection zones. The […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3009","post","type-post","status-publish","format-standard","hentry","category-news"],"blocksy_meta":[],"yoast_head":"\r\n
\nZones:<\/strong> Multiple zones spread across the area.
\nBest for:<\/strong> General room coverage, indoor security, lighting control.<\/p>\n2. Long Range (Curtain)<\/h3>\n
\nZones:<\/strong> Zones arranged in a line.
\nBest for:<\/strong> Hallways, corridors, perimeter security.<\/p>\n3. Pet Immune<\/h3>\n
\nZones:<\/strong> Pattern designed to ignore animals below a certain height.
\nBest for:<\/strong> Homes with pets.<\/p>\n4. High Density \/ Multiple Zones<\/h3>\n
\nBest for:<\/strong> Occupancy sensing where sitting\/working movements need detection.<\/p>\n5. Custom Patterns<\/h3>\n
How to Choose<\/h2>\n
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Where to Buy Lenses<\/h2>\n
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DIY: Modifying Lens Pattern<\/h2>\n
Conclusion<\/h2>\n