| 摘要 |
A 360 DEG pattern field of view optical system for passive infrared detection device is disclosed. The optical system uses a combination of a fresnel lens and a fresnel prism to gather infrared radiation, focus the radiation, and refract radiation onto a focal point. Each of the combination of fresnel lens and prism is positioned substantially circumferentially about a central location to gather the infrared radiation from a 360 DEG field of view and for focusing radiation gathered onto the central location. At the central location, a sensor is located. The sensor converts the focused infrared radiation into an electrical signal.
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