Collection: 850nm Bandpass Filter

An 850nm bandpass filter transmits light primarily around the wavelength of 850 nanometers (nm) while significantly blocking other wavelengths. Think of it as a gatekeeper, allowing only specific "colors" of light to pass through freely. Here's a breakdown of its features and applications:

Function:

    • Passes light close to 850nm: Typically with high efficiency (e.g., 90% or more).
    • Blocks light: Significantly at wavelengths shorter or longer than 850nm.
    • Bandwidth (FWHM): Defines the range of transmitted wavelengths around 850nm. Narrower bandwidth offers higher selectivity but lower overall transmission.

Applications:

    • Night vision: 850nm falls within the near-infrared (NIR) spectrum, invisible to the human eye. Bandpass filters at this wavelength enable covert illumination for night vision devices without visible light emission.
    • Machine vision: Used in systems that rely on NIR cameras for:
        • Inspecting objects where visible light might be obscured or create glare.
        • Identifying specific materials based on their NIR reflectance properties.
        • Fluorescence microscopy: Isolating specific fluorescent emissions excited by 850nm light.
    • Biomedical imaging: NIR light can penetrate deeper into tissue than visible light. 850nm bandpass filters can be used in:
        • Fluorescence imaging: Studying biological processes inside living organisms.
        • Photodynamic therapy: Delivering light-activated therapy to target tissues.
    • LiDAR (Light Detection and Ranging): Used in lasers for distance measurement and 3D imaging. 850nm filters can isolate the desired laser return signal and block background noise.
  • Face recognition: Cameras with 850nm illumination can capture facial features even in low-light conditions without disturbing subjects.

15 products

Applications for 850nm Bandpass Filter

Night vision and security: 850 nm LEDs are commonly used for illumination in night vision and security applications, such as surveillance, traffic control, license plate recognition, and biometric identification. A bandpass filter with a 850 nm CWL can block the ambient light and pass the reflected 850 nm LED light, enhancing the contrast and quality of the image. A dual bandpass filter that also passes the visible light can allow for full color imaging by day and infrared imaging by night.

Biomedical fluorescence: Some biomolecules, such as NADH and FAD, have fluorescence emission peaks around 850 nm when excited by near-UV light.A bandpass filter with a 850 nm CWL can block the excitation light and pass the emission light, enabling the detection and quantification of these molecules in biological samples.850 nm is also a very commonly referenced wavelength used in various vegetation health index calculations.

Laser diode cleanup: Some laser diodes have a broad spectrum of emission that can interfere with the desired wavelength.A bandpass filter with a 850 nm CWL can filter out the unwanted wavelengths and pass the 850 nm laser light, improving the spectral purity and the performance of the laser diode.

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