Infrared sensors


Posted on Feb 7, 2014

Fresnel lens a thin disc of glass or plastic carrying a series of concentric stepped rings, each successive step from the central ring having the surface curvature of a much thicker lens Fresnel lens Fresnel Lenses for Rear Projection Systems, Film Fresnel Lenses, Field and Condenser Lenses, Passive Infrared Lenses (PIR Single Lenses), Passive Inf


Infrared sensors
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rared Lens Arrays (Combo Arrays), Uniform Sensitivity PIR Lens Array Fresnel lens the Fresnel lens is a thin, flat optical lens which consists of a series of small narrow concentric grooves on the surface of a lightweight plastic sheet in order to reduce the thickness, weight and cost. Each groove is at a slightly different angle than the next and with the same focal length in order to focus the light toward a central focal point. Every groove can be considered as an individual small lens to bend parallel fresnel light waves and focus the light Fresnel lenses Positive Focal Length Fresnel Lens Used as a Collector, Positive Focal Length Fresnel Lens Used as a Collimator, Negative Focal Length Fresnel Lens Used as a Diverger, Construction of a Fresnel lens from its corresponding asphere, pdf file Fresnel lenses Positive Focal Length Fresnel Lens Used as a Collector, Positive Focal Length Fresnel Lens Used as a Collimator, Negative Focal Length Fresnel Lens Used as a Diverger, Construction of a Fresnel lens from its corresponding asphere, pdf file How Infrared motion detector components work PIR 325, the pyroelectric sensor is made of a crystalline material that generates a surface electric charge when exposed to heat in the form of infrared radiation. When the amount of radiation striking the crystal changes, the amount of charge also changes and can then be measured with a sensitive FET device built into the sensor, infrared...




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