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!
在线联系供应商
Other supplier products
 |
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 ... |
 |
Metal Casing Good Reliablity Phototransistor D57 Series for Light Control Lamp | Owning very strong R&D Center, Senba can research and develop the pyroelectric infrared sensor independently. Among those pir sensor manufactur... |
 |
Analog PIR Sensor | pir sensor analog or PIR , pyroelectric infrared sensor, is normally known as a motion detector. It is a passive sensor based on measuring infrared... |
 |
High Quality Diam 7mm Light Resistor for Outdoor Solar Garden Light GL7537-1 | Overview A photoresistor (or light-dependent resistor, LDR, or photo-conductive cell) is a light-controlled variable resistor. The resistance of a ... |
 |
Fresnel Lens | We have large fresnel lens for sale! Fresnel lens, also known as threaded lens, Fresnel lens is mostly made of polyolefin material, the surface of ... |
Same products
 |
China made Vibration sensorHD-ST-A3-B3 for power plant | 卖方: 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 | 卖方: 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 | 卖方: 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 | 卖方: 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 | 卖方: Suzhou Shengyi Motor Co., Ltd | Except for the different sizes of these motors, they are all high speed brushless wheel motors th... |
