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Dual-Band 850nm 940nm IR Bandpass Filter | Custom Optical Filter for Biometric Imaging

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Categories	IR Cut / IR Pass Filters
Brand	FELIX GLASS optical glass Manufacturing base
Model	FG-DUAL850-940-FILTER
ual Passbands	850 nm & 940 nm infrared wavelength
FWHM	20 nm (Customizable)
Peak Transmission	≥90% at target passbands
Blocking Range	: 400–700 nm full visible spectrum
Blocking Depth	: OD4 – OD6 for all out-of-band radiation
AOI	: 0° standard, customer-specified angle available
Substrate	: Premium N-BK7 optical glass
Shape	: Custom round disc / square sheet
Coating	: Multi-layer precision interference coating
Unit Price	US $ 7.8-13.2 / piece
FOB port	SHENGZHEN SHANGHAI GUANGZHOU
Terms of Payment	L/C, D/A, D/P, Western Union
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Detail Information

Dual-Band 850nm / 940nm Infrared Bandpass Filter

Felix Glass dual-band infrared bandpass filter is a high-precision multi-wavelength interference optical component engineered for professional biometric imaging. This custom optical filter stably transmits two target infrared spectral bands at 850nm and 940nm, while providing deep suppression of 400–700nm visible wavelengths and all out-of-band stray radiation.

Adopting high-quality N-BK7 optical glass substrate and ultra-stable multi-layer sputtered coating, this dual-wavelength filter delivers consistent spectral performance, low spectral drift and high imaging stability for long-term module integration.

Core Product Advantages

- Dual infrared passband design, supporting both 850nm and 940nm IR illumination systems

- Deep OD4-OD6 blocking of full visible spectrum, effectively eliminating background light noise

- High peak transmittance over 90% at target infrared bands, ensuring sufficient infrared signal intake

- Fully customizable round, square shapes and arbitrary dimensions for diversified camera modules

- Custom edge blackening, thickness tolerance and special spectral specifications available

- Durable optical glass substrate for stable integration and continuous operation in biometric camera modules

Typical Application Scenarios

- Facial recognition biometric camera systems

- Fingerprint identification optical modules

- Smartphone infrared imaging sensors

- Access control & attendance recognition equipment

- Industrial near-infrared optical inspection systems

- Dual-wavelength machine vision imaging devices

OEM Manufacturing Capability

We provide full one-stop customized optical processing, including precision glass cutting, shaping, multi-band spectral coating, edge finishing, strict spectral transmission testing and professional surface inspection.

We support prototype sampling, small-batch trial production and large-scale mass manufacturing. Every dual-band bandpass filter is fully tested to meet customer-specified spectral and dimensional requirements before delivery.

Request a Quote

Please provide your required passband tolerance, FWHM, blocking level, dimension and shape specifications. Our optical engineering team will provide tailored dual-band IR filter solutions and competitive factory pricing.

FAQ

1. What spectral performance does this dual-band IR filter provide?

It is designed to transmit the specified 850 nm and 940 nm infrared passbands while suppressing 400–700nm visible wavelengths and other out-of-band light according to customized spectral specifications.

2. What substrate material is used for the 850/940nm dual bandpass filter?

High-stability N-BK7 optical glass is adopted as standard substrate, equipped with durable multi-layer interference coating for stable spectral performance.

3. Can I customize the size and shape of this dual-wavelength filter?

Yes. We offer fully customized round and square outlines, plus customizable thickness, edge blackening, FWHM bandwidth and blocking OD level.

4. What equipment is this dual-band infrared filter suitable for?

It is widely used for facial recognition, fingerprint identification, smartphone infrared sensors, access control systems and dual-wavelength industrial machine vision devices.

5. Do you support sample service and mass production?

Absolutely. We provide prototype sampling, small trial batches and large-scale manufacturing, with full spectral and dimensional inspection for every finished filter.

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Learn more from our FAQ

What is your MOQ for custom optical glass and display glass parts?: Felix Glass offers highly flexible MOQ to support client projects, including prototype testing, small batch trial orders and large-volume mass production. All products can be fully customized according to your drawings, tolerances and application standards. Send us your specs to get an accurate price quote within 24 hours.

Can I get free glass samples for testing before bulk order?: Yes, our FELIX GLASS factory supports sample testing for a wide range of precision optical glass components and assemblies. The lead time for sample production is 3 to 7 working days. Please contact us today to arrange samples and obtain a customized solution that meets your needs.

What is the production lead time for custom optical glass components?: What is the production lead time for custom optical glass components?
Answer: The lead time for standard samples is 3–7 business days, while mass production takes 15–25 business days, depending on product complexity and order volume. We provide reliable, rapid delivery for orders serving the industrial, medical, automotive, and aerospace sectors. Please submit your project details to receive an accurate delivery schedule.

Are your optical glass products ISO, CE and RoHS certified?: All FELIX GLASS precision optical glass components comply with ISO quality system standards, as well as CE and RoHS requirements. We provide comprehensive test reports, material certificates, and inspection documentation for customer review. Please feel free to request full certification details and a formal quotation today.

Do you offer one-stop custom optical glass processing services?: Yes. We provide a full range of in-house processing services, including CNC machining, precision grinding, optical polishing, vacuum coating (AR, AF, AG, IR), tempering, and screen printing. Every step—from raw material to finished product—is carried out within our own facility. Please let us know your requirements, and we will provide you with the most cost-effective solution.