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
 |
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... |
 |
Low Distortion Coupling Linear Optocoupler LCR - 0203 Series for Volume Control and Electrical Coupling | Overview Optocoupler is an electronic component that transfers electrical signals between two isolated circuits by using light. It is widle used i... |
 |
6Pins Long Rang Human Motion Detector HM612 for Smart Light Switch | Overview Senbais the specialist PIR manufacturer for more than 15 years. We are the most advanced factory with complete categories. With strong ... |
 |
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... |
 |
SB412 High Sensitivity Digital PIR Modlue for Light Control Lamp | Overview Senbais the specialist PIR manufacturer for more than 15 years. We are the most advanced factory with complete categories. With strong R&... |
Same products
 |
LVDT Displacement Sensors LVDT-150-6 for thermal power plant | Seller: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD | "Made in China LVDT Displacement Sensors LVDT-150-6 for thermal power plant Is YOYIK for the use ... |
 |
honeycomb filter | Seller: Xuhaifa Filter Co., Ltd. | honeycomb filter Honeycomb Filter Featuring a unique , these filters provide high surface... |
 |
China made Vibration sensorHD-ST-A3-B3 for power plant | Seller: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD | "China made Vibration sensorHD-ST-A3-B3 for power plant is an exclusive product for power units o... |
 |
GE FANUC PLC Module IC693MDL340 | Seller: 840499 | The IC693MDL340 is a 120 volt, 0.5 Amp AC Output Module of the Series 90-30 manufactured by GE Fa... |
 |
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... |
