Bandpass Filters

What is Bandpass Filter?

A bandpass filter functions as an optical device that permits the transmission of light at a designated wavelength while reflecting or reducing the intensity of light at different wavelengths. It selectively enables a fraction of wavelengths within the spectrum to pass through. Typically, this filter is employed to facilitate the transmission of a specific spectral range while obstructing other wavelengths. Its operational range spans ultraviolet, visible, near-infrared, and far-infrared light bands, tailored in accordance with the customer’s application requirements.

ITEM NoAngle of incidencecenter wavelengthHalf PassbandBandpassCut-off bandDiaphragm SizeSubstrateMembrane material
BP780-60O780±260±2T>93%@753-807OD>6@300-740&820-90047.8*42.3*(0.9-1.0)FS 7980 0FTa2O5/SiO2
BP615-40O615±240±2T>92%@598-633OD>6@350-590&645-85047.8*42.3*(1.0-1.1)FS 7980 0FTa2O5/SiO2
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Know-how about Optical Bandpass Filters

Why Noni Bandpass Filters?

Noni Optics offers a comprehensive selection of over 140 bandpass filters catering to diverse wavelength ranges. Our filters find extensive application in forms of UV bandpass filter, visible, IR bandpass filter, tunable bandpass filter and more. With varying transmittances and sizes, you have ample choices. As a seasoned optical components provider, we boast advanced manufacturing and testing facilities to ensure top-tier quality. Additionally, our customization capability allows us to tailor bandpass filters to your specific demands, aligning precisely with your requirements.


How to Classify Different Bandpass Filter Types?

Bandpass filters can be categorized based on their distinct optical properties and designs. Here is some common classification logic for bandpass filters, Categorically, based on the frequency range they accommodate:

  • Narrow Bandpass Filter: With a limited passband width, it’s ideal for precise frequency selection applications.
  • Wideband Pass Filter: Featuring a broad passband width, it’s suitable for applications demanding passage through a wide frequency range.
  • Bandpass filters can be categorized by the specific frequency range:
  • UV Bandpass Filter: Operates within the ultraviolet spectral range.
  • Infrared Bandpass Filter: Functions within the infrared spectral range.
  • Bandpass filters can be categorized by their nature:
  • Active Bandpass Filter: Employs an active amplifier for filtering tasks.
  • Passive Bandpass Filter: Utilizes only passive components (capacitors, inductors, resistors) for filtering.
  • Bandpass filters can be categorized by application and attributes:
  • Tunable Bandpass Filter: Allows center frequency adjustment, suited for applications requiring frequency tuning.
  • RF Bandpass Filter: Utilized in wireless communication and RF signal processing for specific frequency range signal transmission.
  • Digital Bandpass Filter: Employed in digital signal processing, tailored filter responses can be designed based on specific requirements.


Active Bandpass Filters VS Passive Bandpass Filters

Active bandpass filters and passive bandpass filters represent two distinct classes of filters, each with unique operational principles, attributes, and application scopes. Here is a comparative analysis:

  • Working principle: Active bandpass filters leverage active amplifiers to execute the filtering function. These amplifiers furnish gain to offset signal loss incurred during filtration. Passive bandpass filters only use passive components (capacitors, inductors, resistors) to achieve filtering functions without the participation of amplifiers.
  • Gain Adjustment: The presence of active amplifiers facilitates signal gain adjustment during the filtration process. This capability aids in compensating for filtering losses and fulfilling specific amplification requisites. Passive filters lack gain functions, exclusively permitting selective passage or blocking of specific frequency signals through filtration.
  • Frequency Tuning: Active bandpass filters can be tuned within a designated range, rendering adaptability to diverse frequency demands. The center frequency and passband range of passive bandpass filters are usually predetermined and lack the tunability exhibited by active filters.
  • Complexity: Given the requirement for active components (amplifiers), active bandpass filters generally manifest more intricacy compared to passive filters. This complexity encompasses considerations like power supply and amplifier design. Due to their reliance solely on passive components, passive bandpass filters typically offer simpler designs. They obviate the need for supplementary power supply and amplifier arrangements.
  • Application: Active bandpass filters are apt for scenarios necessitating signal amplification, adjustment, or tuning within filtration, such as wireless communication systems and radio frequency signal processing. Passive bandpass filters are well-suited for contexts that don’t necessitate signal amplification or tuning, encompassing general optical sensing and spectral analysis.

In essence, active bandpass filters cater to scenarios demanding signal amplification, adjustment, or tuning during filtration, while passive bandpass filters address situations where filtration tasks are sought without involving signal gain or tuning requisites.


Bandpass Filters Applications

Bandpass filters are suitable for a variety of applications such as spectroscopy, clinical chemistry or imaging. Here are some common applications for band pass filters:

  • Spectroscopy: Bandpass filters can be used to selectively transmit or reflect spectral signals of specific wavelengths, thereby enabling wavelength selection and analysis in spectral analysis.
  • Clinical chemistry: In clinical laboratories, bandpass filters can be used for fluorescence, absorption spectroscopy, etc., for medical detection and analysis.
  • Imaging: Bandpass filters are widely used in imaging applications including fluorescence microscopy, machine vision, image recognition, and factory automation. They can selectively pass specific wavelength ranges of light to enhance image contrast and clarity.
  • Biochemistry: In biochemical research, bandpass filters can be used to selectively transmit or reflect wavelengths associated with specific biomolecular interactions, thereby aiding in the analysis and study of biomolecules.
  • Medical Imaging: In medical imaging equipment, such as optical imaging systems and medical testing instruments, bandpass filters can be used to selectively transmit or reflect specific wavelengths of light for observation and diagnosis of tissues and cells.
  • Laser systems: In laser systems, bandpass filters are used to selectively transmit laser light of a specific wavelength to meet the requirements of the laser system, such as laser tuning, wavelength selection, etc.
  • Sensors and Detection: In sensors and detectors, bandpass filters can be used to selectively capture signals at specific wavelengths, enabling detection and measurement of target parameters.
  • Analytical Instruments: Bandpass filters are widely used in analytical instruments to selectively filter signals of specific wavelengths for analysis and detection.
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FAQ, Frequently Asked Questions

Some important information you might want to know.

  • Do you offer standard optic components (Shelf Products) ?
    No, we don’t sell shelf products. We offer customization service according to your requirements for specific projects or brands equivalent.
  • What substrates do you use for custom optical components?
    Our most frequently used substrates are Zinc Selenide (ZnSe), Zinc Sulfide (ZnS), Silicon, Germanium (Ge), Copper, Aluminum, Mo, PMMA, Chalcogenide Glasses, etc.
  • Can you help to customize according to samples we offered?
    We highly recommend producing according to specific drawings. Since there are lots of indexes which can not be obtained by measuring samples, such as requirements of material.
  • What's your MOQ for customized projects?
    We set very low MOQ for customization projects. But of course, price will be quoted according to the quantity to cover our production cost.
  • How to protect my personal information and our technical information?
    Don’t worry, we will sign the NDA with all our customers if needed.
  • What shipping methods are available?
    We commonly use UPS, FedEx, DHL, TNT, SF, EMS etc. We also accept your own appointed forwarder.
  • What's the lead time for sampling, for mass production?
    For customization projects, sampling lead time will be 1 to 2 weeks. For mass production, 1 to 2 months for orders with quantity 1000 to 2000 pieces.
  • Can you offer all the Certificates required by our customs and our company?
    Every product that leaves the factory has been carefully tested. We would like to offer you all the certificates required by your side. Such as:
    • Raw material certificate and technical drawing
    • RoHS Report of substrate
    • Inspection report (data) of 3D optical profiler, surface flatness etc.
    All products delivered by us will be carefully cleaned and packaged.

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