Fresnel Lens
Fresnel lens, also known as threaded lens, Fresnel lens is mostly made of polyolefin material, the surface of the lens is smooth, and the other side is filled with concentric circles from small to large. Its texture is designed to utilize the interference of light and to be based on relative sensitivity and acceptance angle requirements. The quality requirement of the lens is very high. A good lens must have a smooth surface, clear texture. Its thickness varies with the application and normally about 0.6 mm. The lens characteristics are wider surface, thinner and farther detection distance.
There are two functions of Fresnel lens: one is the focusing effect; the other is to divide the detection area into several bright and dark areas, so that the moving object entering the detection area can produce the change of heat release on the PIR in the form of temperature change. It is what we called Infrared signal. We can say that fresnel lens help to strengthen the infrared signal and to make PIR work well.
The Fresnel lens is a convex lens that is equivalent to infrared and visible light in many cases, and the effect is better, but the cost is much lower than that of a conventional convex lens. It is often used in applications where accuracy is not critical, such as slide projectors, thin film magnifiers, infrared detectors, etc.
Normally the lens’ shapes are dome and flat. But these years as the smart home is more and more popular, different lens are needed to match with different controllers. As one of the fresnel lens suppliers,Senba can help customers to design and mould the lens they want.
Отправить запрос, связаться с поставщиком
Другие товары поставщика
 |
Long Distance 12M Detector Sensor HM412 From Senba Factory | Overview PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are sm... |
 |
2 Elements Pyroelectric Infrared Sensor D204S | Overview D204Scome standard with enhanced immunity to EMI (Electro-Magnetic Interference). It widely used in security system. Senba is the specia... |
 |
3Pins Electronic Components PIR BL312 From Senba Factory | Overview Senbais the specialist PIR manufacturer for more than 15 years. We are the most advanced factory with complete categories. With strong R&... |
 |
6pins Digital Passive Infrared Sensor BS612 | Overview Senba is one of the most professionalPIR sensor manufacturersfor more than 15 years. We are the most advanced factory with complete categ... |
 |
Fast Response Light Dependent Resistor φ10 Series for Light Switch | Featureof light sensitive resistor Coated with epoxy Good reliability Small volume Good spectrum characteristic Standard Type and Specifications ... |
