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IR Frequency Region: Fingerprint Region

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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Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

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Published on: January 14, 2020

Real-time fingerprint sensor using a hologram.

S Igaki, S Eguchi, F Yamagishi

|August 20, 2010

Summary

This summary is machine-generated.

A new holographic fingerprint sensor uses a laser and special plate to create bright, clear fingerprint images. This advanced sensor avoids distortion found in older fingerprint identification systems.

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Area of Science:

Optics and Photonics
Biometrics and Security

Background:

Conventional fingerprint sensors often suffer from trapezoidal distortion.
Existing systems may lack clarity in fingerprint image reproduction.

Purpose of the Study:

To develop an advanced holographic fingerprint sensor for improved personal identification.
To overcome limitations of traditional fingerprint sensing technologies.

Main Methods:

Utilizing a laser as the light source for illumination.
Employing a light-conducting plate with a grating-type hologram.
Integrating a focusing lens system beneath the hologram.

Main Results:

The sensor successfully generates bright fingerprint images.
Elimination of trapezoidal distortion through a plane-parallel plate design.
Equal optical path lengths from fingerprint to hologram achieved.

Conclusions:

The developed holographic sensor offers superior fingerprint imaging.
This technology presents a significant advancement in fingerprint identification systems.
The design ensures high-quality image capture without inherent distortions.