High Precision Focal Length 250mm Glass Spiral Fresnel Lens

• After-sales Service: on-Line Support
• Warranty: Available
• Usage: Lighting, Medical, Optical, PIR Sensor
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: D-P23O1T14202
• Type: Fresnel Lens
• Transmittance: >95%
• Shape: Dome
• Material: HDPE
• Lenses Color: Clear
• Certification: RoHS, ISO9001
• Customized: Customized
• Coating: as Request
• Substrate: Acrylic
• Size: 3-500mm
• Dimension Tolerance: +/-1mm or Better
• Packing: Shock-Proof Packing
• Focal Length: 2mm-10000mm+/-0.3%
• OEM: Yes
• Transport Package: as Request
• Specification: 3-500mm
• Trademark: VY or OEM
• Origin: Cn
• HS Code: 9001909090
• Production Capacity: 500000 PCS/Month
• Package Size: 32.00cm * 21.00cm * 21.00cm
• Package Gross Weight: 0.500kg

Product Description

Product Description

Fresnel lens, in simple terms, has equidistant tooth patterns on one side of the lens. Through these tooth patterns, the effect of
light bandpass (reflection or refraction) on the specified spectral range can be achieved. Traditional polishing optical equipment
Bandpass optical filters are expensive. Fresnel lens can greatly reduce costs. A typical example is PIR (Passive Infrared
Detector). PIR is widely used in alarms. If you take a look, you will find a small plastic cap on each PIR. This is the Fresnel
lens. The inside of the little hat is engraved with teeth. This Fresnel lens can limit the peak frequency of incident light to
about 10 microns (the peak value of human body infrared radiation). Function: One is the focusing effect, that is, the

pyroelectric infrared signal is refracted (reflected) on the PIR; the second is the function of dividing the detection area into
several bright and dark areas, so that the moving objects entering the detection area can change in the form of temperature
Generate a varying pyroelectric infrared signal on the PIR. Fresnel lens is a very widely used optical element, its design and
manufacturing design to multiple technical fields, including optical engineering, polymer material engineering, CNC machining,
diamond turning process, nickel plating process; molding, injection molding, Casting and other manufacturing processes.

Features:
1.designed for passive infrared sensor applications 
2.Well suited for compact, low profile sensors 
3.Can be used in applications involving security, lighting controls and environmental controls 
4.Optimized for dual element pyroelectric devices 
5.White light immunity to reduce false triggers 
6.UV resistant for outdoor applications 
7.Designed for uniform sensitivity to reduce electronic gain
 
Functions:
The Fresnel lens function has two: One, the focusing action, soon hotly releases the infrared signal refraction (reflection) on PIR, the second function is divides into the search coverage in certain area pellucidae and the dark area, causes to enter the search coverage the motion object to be able to produce by the temperature change form on PIR changes releases the infrared signal hotly.

Application areas:

1. Projection display: Fresnel projection TV, rear projection Fresnel screen, overhead projector, collimator;
2. Concentrating light: Fresnel lens for solar energy, Fresnel spotlight for photography, Fresnel magnifying glass;

3. Aviation navigation: Fresnel lens for lighthouse, Fresnel flight simulation;

4. Scientific research: laser detection system, etc.;

5.Infrared detection: passive movement;

6. Lighting optics: car headlights, traffic signs, optical landing systems.
 

* Picture show of our fresnel lens

Specification
 

Material	Optical glass
Diameter	3-460mm
Diameter tolerance	±0.1mm
Surface quality	60-40
Coating	AR coating, BBAR coating, blacking painting, etc.
Color	Clear

Related Products

 

VY Optics could also manufacture and design other optical elements, including achromatic lens, dome lens, filter, prism, ball lens, cylindrical lens, optical mirrors, spherical lens and rod lens, we can fabricate high-precision lens as per your requested.

Our company
 

FAQ

Q: Do you provide samples? Is it free or charged?
 ·  We'd like to supply samples for free if we have it in stock, but we don't pay freight.
Q: How long is your delivery time?
 ·  Regarding inventory, it is 3 working days;
 ·  For customized one, it's about 15-25 working days, depended on exact quantity and order date.
Q: Is it possible to customize special lens?
 ·  Yes, to customize special optical element and coating are available here.
Q: How to pay?
 ·  T/T, Alibaba online assurance payment, MoneyGram, West Union, Paypal and so on.
Q: How to ensure the safety of payment?
 ·  VY Optics is a reliable supplier not only audited on Alibaba, but also on Made-in-China, reputation and quality is life of our company, and we support Alibaba Trade Assurance.
Q: How do you ship goods?
 · Low value sample: EUB, E Express of China Post, which is cheap;
 · Light weight parcel: DHL, FedEx, TNT, UPS, EMS, SF Express, China Post;
 · Heavy cargo: by air or by sea, ship on pallet.
Our company enjoy a considerable discount owing to long-term cooperation with courier company.

 

Every details of production and communication is crucial for us, please do feel free to tell us any your question, suggestion or comment on us, it will be very helpful for us to be a worthy, trusted and reliable supplier. Thank you for visiting and stoping!