Fresnel Zone Plate Holography for Moving Objects
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Solution Overview
Problem
Conventional three-dimensional imaging techniques, such as holography, range-finding, and tomography, face limitations including the need for active illumination, complex setups, and sensitivity to optical axis variations, which restrict their ability to capture high-quality images of moving objects or those that do not emit coherent light.
Innovation Solution
A novel apparatus that captures electromagnetic radiation from an object using a diffractive electromagnetic radiation assembly with a single radiation propagation axis, transmitting diffracted radiation to an image capture assembly to produce a hologram without requiring coherent light or active illumination, allowing for stationary or moving objects and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional holography techniques are used, then three-dimensional information can be captured, but active illumination sources and complex electromagnetic radiation assemblies are required
Solution Approach 1:
The object itself serves as the illumination source by emitting or reflecting electromagnetic radiation that passes through the Fresnel zone plate. The system uses the object's own radiation rather than requiring external active illumination sources, thereby simplifying the device complexity while maintaining the ability to capture three-dimensional information
Solution Approach 2:
The invention extracts only the essential diffractive element (Fresnel zone plate) from conventional complex electromagnetic radiation assemblies. By removing unnecessary mirrors, lenses, and other complex components, the system achieves three-dimensional imaging with a minimal setup consisting of merely the zone plate and detector
2Measurement precision
If conventional holography techniques are used, then three-dimensional images can be produced, but the system is sensitive to optical axis variations and requires stationary objects
Solution Approach 1:
The invention transforms the conventional two-dimensional holographic recording into a three-dimensional measurement process by utilizing the depth-encoded diffraction pattern. The Fresnel zone plate naturally encodes depth information in the diffraction pattern, allowing the system to capture three-dimensional information of moving objects without being sensitive to optical axis variations
Solution Approach 2:
The system changes the operational parameters from requiring stationary objects to accommodating moving objects by using the object's motion itself as part of the measurement process. The detector captures diffraction patterns at different positions, and computer processing reconstructs three-dimensional information from these dynamic measurements
3Measurement precision
If conventional techniques are used, then three-dimensional information can be captured, but poor quality images with low resolution are produced
Solution Approach 1:
The Fresnel zone plate performs preliminary diffraction and encoding of three-dimensional information before detection. By pre-encoding the depth and spatial information in the diffraction pattern, the system ensures high-resolution capture without requiring complex post-processing or multiple measurements
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
Enables the capture of high-quality three-dimensional images with low light intensity and reduced susceptibility to optical axis variations, suitable for a wide range of objects including those that do not emit coherent light, and allows for single-image capture, enhancing portability and cost-effectiveness.
Implementation Method 1
an electromagnetic radiation assembly configured to receive a received electromagnetic radiation from the object, diffract the received electromagnetic radiation, and transmit a diffracted electromagnetic radiation
Data Source
AI summary
An apparatus and method to produce a hologram of an object includes an electromagnetic radiation assembly configured to receive a received electromagnetic radiation, such as light, from the object. The electromagnetic radiation assembly is further configured to diffract the received electromagnetic radiation and transmit a diffracted electromagnetic radiation. An image capture assembly is configured to capture an image of the diffracted electromagnetic radiation and produce the hologram of the object from the captured image.