Hologram Detection Device Coaxial Sensor
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Solution Overview
Problem
Existing methods for authenticity verification of holograms using reading devices are ambiguous due to the difficulty in collectively acquiring three-dimensional spatial information, which can be imitated, leading to uncertain verification results.
Innovation Solution
A detection device is designed with a reference light source, a sensor, and a hologram coaxially arranged, allowing for the miniaturization of the detection device and the easy acquisition of three-dimensional spatial distribution information from the hologram.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual inspection methods are used for authenticity verification, then the verification process is simple, but the verification result is ambiguous because reconstructed information can be imitated
Solution Approach 1:
The patent transitions from two-dimensional visual inspection to three-dimensional spatial information acquisition by positioning the sensor on the optical axis to capture depth-resolved light intensity distributions, making counterfeiting difficult while maintaining verification simplicity
Solution Approach 2:
The patent replaces subjective visual inspection with objective optical measurement using a sensor to detect light intensity distributions, eliminating human subjectivity while keeping the device compact and easy to operate
2Extent of automation
If reading devices are used to acquire hologram information, then the verification process is automated, but three-dimensional spatial information cannot be collectively acquired
Solution Approach 1:
The patent positions the sensor on the optical axis to capture light intensity distributions at different depths, recovering three-dimensional spatial information that conventional lateral-reading devices cannot obtain, while maintaining automated verification
Solution Approach 2:
The patent creates a detailed optical signature by measuring light intensity distributions at multiple positions along the optical axis, capturing the complete three-dimensional structure of the hologram that can be used for accurate authentication
3Device complexity
If conventional reading devices are used, then the device structure is simple, but the device size cannot be miniaturized
Solution Approach 1:
The patent merges the reference light source and sensor into a coaxial configuration on the optical axis, eliminating the need for separate illumination and detection paths, thereby miniaturizing the device while maintaining functional simplicity
Solution Approach 2:
The coaxial optical configuration serves multiple functions: illuminating the hologram, collecting reconstructed light, and enabling three-dimensional spatial measurement, reducing the number of components needed while enhancing device capabilities
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
This configuration enables straightforward acquisition of three-dimensional spatial distribution information from holograms, enhancing the authenticity verification process by distinguishing genuine from counterfeit holograms.
Implementation Method 1
a light source having a coherence length such as a laser is used to cause reference light and object light to interfere with each other, and a resultant interference fringe is recorded
Data Source
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AI summary
There is provided a hologram that includes a formation layer and a reflection layer that are laminated. The formation layer has an optical phase modulation structure on a first interface in contact with the reflection layer. When reference light emitted from a point light source enters through a second interface different from the first interface of the formation layer, the entirety or part of an image to be reconstructed by the optical phase modulation structure is reconstructed as spatial information on the point light source side relative to the second interface.