830nm Bandpass Filter

830nm light is a near-infrared wavelength with good tissue penetration and minimal visible light interference, enabling non-invasive detection in various environments.

  • Application 1: In biometric sensors, it isolates 830nm light to measure physiological signals like blood oxygen levels by leveraging its ability to penetrate skin and muscle tissue.
  • Application 2: In spectroscopy systems, the filter ensures only 830nm light is analyzed, critical for applications like chemical compound identification where specific wavelengths correlate with molecular absorption.
  • Application 3: In night vision or surveillance cameras, it blocks visible light and allows 830nm near-infrared light to pass, enabling clear imaging in low-light conditions without detection by the human eye.
  • US8641193B2 - Spectral contrast for glaucoma imaging

    US8641193B2 - Spectral contrast for glaucoma imaging

    Context: This patent describes an Optical Coherence Tomography (OCT) system used to diagnose glaucoma by analyzing the Retinal Nerve Fiber Layer (RNFL).

    Usage of Filter: The system utilizes an 830 nm bandpass filter (or source isolation) to direct a specific band of Near-Infrared (NIR) light into the eye. This 830 nm beam is often combined with a visible beam (e.g., 500 nm) using a beam combiner (dichroic filter) and then separated or analyzed using interferometry.

    Function: The 830 nm light penetrates the retinal layers effectively, while the 500 nm light reflects off the surface. The filter ensures that only the relevant backscattered 830 nm signal is collected for the deep-tissue tomogram.

    Result: The system achieves high-contrast differentiation of the RNFL from underlying tissues, enabling earlier and more accurate detection of glaucoma-related nerve damage than using reflectance intensity alone.

  • US7648242B2 - Hybrid spectral domain optical coherence tomography line scanning laser ophthalmoscope

    US7648242B2 - Hybrid spectral domain optical coherence tomography line scanning laser ophthalmoscope

    Context: A hybrid imaging system that combines an OCT scanner with a Line Scanning Laser Ophthalmoscope (LSLO) for comprehensive eye exams.

    Usage of Filter: The system uses an illumination source in the 800–900 nm range (centered at ~830 nm). Optical filters are used in the detection arm to separate this imaging light from other potential signals or stray light.

    Function: The 830 nm wavelength is used because it is invisible to the patient (preventing the pupil from constricting/closing during the scan) but detectable by standard silicon CCD/CMOS cameras.

    Result: This allows for "non-mydriatic" imaging, meaning the doctor can get high-resolution, wide-field images of the retina without needing to use chemical drops to dilate the patient's pupils.

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