Diffractive Optical Elements for High-Resolution Skin Topology Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fingerprint identification technologies face limitations in resolving pore patterns and fine details of ridge and valley intersections, leading to distorted images and inadequate resolution, making them unsuitable for reliable identification, especially in field applications where temperature variations and moisture can further complicate the process.
Innovation Solution
A compact, high-resolution imaging system utilizing diffractive optical elements and a skin-contact surface that induces total internal reflection, allowing for high-contrast, undistorted imaging of skin topology, including friction ridges and pores, across a broad temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical designs are used for fingerprint imaging, then the device structure is simple, but the resolution of pore patterns and fine details is insufficient
Solution Approach 1:
The patent introduces diffractive optical elements as intermediary components between the light source and the fingerprint surface, and between the fingerprint surface and the sensor. These DOEs manipulate light propagation to achieve high-resolution imaging of pores and ridge details while maintaining a relatively compact device structure.
Solution Approach 2:
The patent employs diffractive optical elements that change the spatial distribution and angular parameters of light beams. By controlling diffraction angles and beam shaping parameters, the system achieves enhanced resolution for capturing fine fingerprint features without requiring excessively complex optical arrangements.
2Reliability
If conventional imaging methods are used, then the optical path is simple, but distorted images are produced due to trapezoidal distortions and moisture effects
Solution Approach 1:
The patent introduces diffractive optical elements as intermediary components between the light source and the fingerprint surface, and between the fingerprint surface and the sensor. These DOEs manipulate light propagation to achieve high-resolution imaging of pores and ridge details while maintaining a relatively compact device structure.
Solution Approach 2:
The patent employs diffractive optical elements that change the spatial distribution and angular parameters of light beams. By controlling diffraction angles and beam shaping parameters, the system achieves enhanced resolution for capturing fine fingerprint features without requiring excessively complex optical arrangements.
3Measurement precision
If high-resolution imaging is achieved, then identification accuracy is improved, but the device becomes less suitable for field applications
Solution Approach 1:
The patent merges multiple optical functions into integrated diffractive optical elements. The DOEs simultaneously perform beam shaping, angle control, and imaging functions, which reduces the overall device size and complexity while maintaining high-resolution imaging capability suitable for portable field applications.
Solution Approach 2:
The patent employs diffractive optical elements that change the spatial distribution and angular parameters of light beams. By controlling diffraction angles and beam shaping parameters, the system achieves enhanced resolution for capturing fine fingerprint features without requiring excessively complex optical arrangements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system produces reliable, high-resolution images of fingerprints, capable of identifying individuals accurately even in challenging environmental conditions, such as moisture and temperature variations, while being portable and efficient.
Implementation Method 1
at least one illuminating diffractive optical element (DOE) disposed in the optical path of the source beam, configured to diffract the source beam, thereby forming an illuminating beam
Implementation Method 2
a skin contact surface, disposed in the optical path of the illuminating beam, configured to at least partially reflect the illuminating beam at regions of the boundary between the skin-contact surface and skin that are not in contact with the skin contact surface, thereby forming a reflected beam
Implementation Method 3
at least one imaging diffractive optical element (DOE), disposed in the optical path of the reflected beam, configured to diffract the reflected light beam, thereby forming an image beam
Data Source
AI summary
An apparatus and a method for acquiring an image of skin topology. The apparatus comprises at least one light source, configured to form a source beam; at least one illuminating diffractive optical element (DOE) disposed in the optical path of the source beam, configured to diffract the source beam, thereby forming an illuminating beam; a skin contact surface, disposed in the optical path of the illuminating beam, configured to at least partially reflect the illuminating beam at regions of the boundary between the skin contact surface and skin that are not in contact with the skin contact surface, thereby forming a reflected beam; at least one imaging diffractive optical element (DOE), disposed in the optical path of the reflected beam, configured to diffract the reflected light beam, thereby forming an image beam; and a sensor array, configured to receive at least a portion of the image beam and thereby to detect the acquired image.