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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...
Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Optical Scatter Microscopy Based on Two-Dimensional Gabor Filters
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Published on: June 2, 2010

Fingerprint input based on scattered-light detection.

I Fujieda, H Haga

    Applied Optics
    |February 12, 2008
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new compact fingerprint imaging device using scattered-light detection. The innovative technique clearly images fingerprint ridges, valleys, and even pores for enhanced biometric security.

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    Area of Science:

    • Optics and Photonics
    • Biometric Technology
    • Sensor Development

    Background:

    • Traditional fingerprint imaging relies on various optical and electronic principles.
    • Compact and high-resolution fingerprint sensors are crucial for modern security applications.

    Purpose of the Study:

    • To propose and develop a novel compact fingerprint imaging device based on scattered-light detection.
    • To demonstrate the capability of imaging fine fingerprint details, including pores.

    Main Methods:

    • Light is introduced into a glass plate and propagates via total internal reflection.
    • Finger ridges scatter the light, causing it to leak from the plate.
    • Gradient-index optical fibers and an image sensor capture the scattered light.

    Main Results:

    • A prototype sensor with a 13 mm finger-to-sensor distance was successfully developed.
    • High-quality fingerprint images were obtained, clearly showing ridges, valleys, and pores.
    • The technique proves effective for detailed fingerprint acquisition.

    Conclusions:

    • The scattered-light detection method offers a viable approach for compact fingerprint imaging.
    • The developed prototype demonstrates the potential for high-resolution biometric sensing.
    • This technology could enhance security systems requiring detailed fingerprint analysis.