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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...

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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Published on: July 5, 2016

Optical fingerprint recognition using a waveguide hologram.

B Chennankara, W Y Xu, F C Lin

    Applied Optics
    |November 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    We developed a waveguide hologram for fingerprint imaging. This device generates a plane wave to illuminate fingers, enabling high-quality fingerprint capture through spatial filtering.

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    Area of Science:

    • Optics
    • Holography
    • Biometric Imaging

    Background:

    • Traditional fingerprint imaging methods face challenges with image quality and illumination control.
    • Waveguide-based optical systems offer potential for compact and efficient imaging solutions.

    Purpose of the Study:

    • To demonstrate the fabrication of a waveguide hologram for fingerprint image capture.
    • To generate a plane-wave output beam for effective finger illumination.
    • To utilize the hologram for spatial filtering of reflected light.

    Main Methods:

    • Fabrication of a waveguide hologram.
    • Generation of a plane-wave output beam from the waveguide.
    • Using a diverging beam as a reference wave to write gratings in the hologram.
    • Spatially filtering reflected light from a finger using the hologram.

    Main Results:

    • Successful fabrication of a functional waveguide hologram.
    • Generation of a collimated plane-wave beam for fingerprint illumination.
    • The hologram acts as a spatial filter, improving the quality of the captured fingerprint data.
    • Bandpassed information is retrieved through the waveguide.

    Conclusions:

    • Waveguide holograms are a viable technology for enhancing fingerprint image capture.
    • The developed system provides effective illumination and spatial filtering for biometric imaging.
    • This approach offers a novel method for obtaining high-quality fingerprint data.