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Fresnel lens characteristics 2021-10-14
Ningbo Xuanchang Electric Co., Ltd. It's a convex lens.If the light source is parallel, the corners will become dark and fuzzy, because the refraction of light only occurs at the interface of the medium, the convex lens is thicker.The part of the glass where light travels in a straight line attenuates the light.If the part of linear propagation can be removed and the brightness of the image can be kept the same throughout the image after convergence projection, a large amount of materials can be saved to achieve the same focusing effect at the same time.Fresnel lenses use this principle. Fresnel lenses look like a piece of glass with an infinite number of concentric circles (known as Fresnel bands).
Fresnel lenses use special optical principles of lenses 2021-10-14
Ningbo Xuanchang Electric Co., Ltd. Also known as a threaded lens.The effect is better.It is often used in situations where the requirement for accuracy is not very high.But the cost is much lower than ordinary convex lenses Fresnel lens USES the special optical principle of lens;An alternating "blind area" and "high sensitivity area" are generated in front of the detector, such as slide projector, film magnifier, infrared detector, etc.Body infrared is continuously alternating from "blind spots" into "high sensitive area", in order to improve its detection receiver sensitivity, strong and its range of energy, the second part is the detection region is divided into a number of bright and dark areas, thus make the received infrared signal input in the form of strong and weak pulse, Fresnel lens. Fresnel lenses have two effects: one is focusing, which can act on the bandpass (reflection or refraction) of light over a specified spectral range when someone passes in front of the lens. A typical example of this is the PIR, which is the refraction (reflection) of the pyroelectric infrared signal on the PIR, and if you look at one, the inside of the little hat is etched with teeth.The Fresnel lens can focus the light through the narrow-band interference filter on the photosensitive surface of the silicon photoelectric secondary detector.Fresnel lens can greatly reduce the cost, and then wi
AQUATECH SHANGHAI 2021-10-14
AQUATECH SHANGHAI 2021.06
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.