Fresnel Lens
Fresnel lens, also known as threaded lens, plastic Fresnellens 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 large plastic 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 most professional fresnel lens suppliersin China, Senba can help customers to design and mould the lens they want.
Senba Sensing Technology Co.,Ltd., was founded in 2005, with the focus on producing the top quality pir sensor analog. If you want to know more details, just feel free to contact us!
Send product request
Other supplier products
 |
Low Distortion Coupling Linear Optocoupler LCR - 0203 Series for Volume Control and Electrical Coupling | An Overview of Low Distortion Coupling Linear Optocoupler lcr 0203Series for Volume Control and Electrical Coupling Optocoupler is an electronic co... |
 |
Fast Response Light Dependent Resistor φ10 Series for Light Switch | With our own R&D Center, SenbaSensor can do a lot of basic research, and develop our chinese pirsensor and other products with our unique techn... |
 |
4pins Digital Smart Pyroelectric Detector BS412 | Overview of pyroelectric motion sensor BS412 is a newest smart digital motion detector with a small window size. It offers a complete motion detect... |
 |
Infrared Thermopile Sensor | Infrared ThermopileSensor ISB-TS45HISB-TS45H Infrared Thermopile Sensor can be widely used in non-contact temperature measurement. Ir ThermopileSen... |
 |
Fast Response Light Dependent Resistor φ10 Series for Light Switch | Overview of photosensitive resistance A photoelectric device can be either intrinsic or extrinsic. An intrinsic semiconductor has its own charge ca... |
Same products
 |
China Manufacturer Axial seal DLD320-20X2 for steam turbine | Seller: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD | China Manufacturer Axial seal DLD320-20X2 for steam turbine Selection of advanced technology, abs... |
 |
DGW25E-Rear Drive Motor-MTB | Seller: Suzhou Shengyi Motor Co., Ltd | Shengyi powerful DGW25E motor is strong enough to ride on rough mountain trail, which offers stab... |
 |
DGW07-R16 Ebike Brushless Motor | Seller: Suzhou Shengyi Motor Co., Ltd | Except for the different sizes of these motors, they are all high speed brushless wheel motors th... |
 |
CMT07 Ebike Mid Motor | Seller: Suzhou Shengyi Motor Co., Ltd | Specialized for city bike, small size, cost effective, competitive price in the field, so can sav... |
 |
CMT03P Ebike Mid Motor | Seller: Suzhou Shengyi Motor Co., Ltd | Shengyi powerful CMT-03P motor is strong enough to ride on rough mountain trail, which offers sta... |
