850nm Bandpass Filter

The 850nm wavelength falls within the near-infrared spectrum, exhibiting strong penetrating power, low atmospheric attenuation, and excellent compatibility with silicon-based detectors due to their high responsivity at this wavelength.

  • Application 1: In biomedical detection—such as blood oxygen saturation monitoring—850nm bandpass filters precisely isolate this wavelength, enabling light to penetrate biological tissues while minimizing interference from other spectral components, thus facilitating non-invasive measurement of physiological parameters.
  • Application 2: For security surveillance in night-vision systems, infrared cameras integrated with 850nm bandpass filters effectively block visible light, allowing only ambient infrared radiation at this wavelength to be captured. This ensures clear imaging in low-light conditions by leveraging the wavelength's minimal scatter in atmospheric conditions.
  • Application 3: In short-distance fiber optic communications and data center interconnects, 850nm bandpass filters are critical for multimode fiber systems. They ensure efficient transmission of this specific wavelength by reducing modal dispersion and signal loss, optimizing performance in high-speed data transfer environments.
  • US10574911B2 - Multispectral imaging apparatus

    US10574911B2 - Multispectral imaging apparatus

    Context: A multispectral camera system designed for Unmanned Aerial Vehicles (UAVs/Drones), primarily used in precision agriculture to monitor crop health.

    Usage of Filter: The 850nm bandpass filter is integrated into one of the four distinct optical paths (lenses) of the camera array.

    Function: It strictly isolates the Near-Infrared (NIR) wavelength band (centered at 850nm) from the incoming sunlight reflected by the plants, blocking visible light frequencies (Red, Green, Blue).

    Result: By capturing a pure 850nm image and comparing it with a separate Red (e.g., 660nm) image, the system can calculate the Normalized Difference Vegetation Index (NDVI). This allows farmers to determine the chlorophyll content and stress levels of crops invisible to the naked eye.

  • US10928485B2 - Lidar ring lens return filtering

    US10928485B2 - Lidar ring lens return filtering

    Context: A LiDAR (Light Detection and Ranging) sensor assembly used for autonomous vehicle navigation and mapping.

    Usage of Filter: The bandpass filter is located in the "return path" of the optical system, situated between the receiving lens (specifically a ring lens design) and the avalanche photodiode detector.

    Function: It serves to "clean" the incoming signal. It permits the passage of the specific laser wavelength (in this case, matching an 850nm emitter) reflected off objects, while filtering out solar background radiation and stray light scattering.

    Result: This ensures the precise timing of the laser pulse's return (Time-of-Flight measurement), resulting in accurate distance calculation and high-fidelity point cloud generation without "ghost" points caused by light interference.

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