Talbot Interferometer Absorptive Imaging via Fringe Visibility Control
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Solution Overview
Problem
The existing fringe scanning method for radiation capturing systems using Talbot interferometers or Talbot-Lau interferometers is inefficient in capturing absorptive images, as it requires repeated movement of gratings, leading to long capturing times and false images due to subject movement and grating position changes, making it difficult to obtain absorptive images without removing the grating from the field of view.
Innovation Solution
A radiation capturing system that includes a Talbot interferometer or Talbot-Lau interferometer with a low visibility capturing unit to reduce moire fringe visibility, allowing for easy capture of absorptive images without grating movement, using a scatterer to minimize moire fringe visibility and a generating unit to produce absorptive images from captured moire fringe images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the fringe scanning method is used to capture absorptive images, then the reconstructed image quality is improved, but the capturing time is extended and false images are generated due to subject movement and grating position changes
Solution Approach 1:
The patent segments the image capture process into two distinct modes: a low visibility mode for rapid absorptive image capture and a full visibility mode for high-quality reconstructed image capture. This segmentation allows the system to optimize capturing parameters based on the specific imaging goal, thereby reducing capturing time for absorptive images without compromising the quality of reconstructed images.
Solution Approach 2:
The patent changes the visibility parameter of moire fringes by adjusting the relative position between the first grating and the second grating. By controlling this parameter, the system can switch between low visibility mode (for rapid absorptive imaging) and full visibility mode (for high-quality reconstructed imaging), thus resolving the contradiction between capturing speed and image quality.
2Measurement precision
If the fringe scanning method is used to capture absorptive images, then the reconstructed image quality is improved, but the device operation complexity increases due to repeated grating movement and stopping
Solution Approach 1:
The patent introduces a dynamic control mechanism that allows the system to adjust the visibility of moire fringes in real-time based on the imaging requirements. The controller dynamically modifies the relative position of gratings to switch between low visibility mode (simplifying operation for absorptive imaging) and full visibility mode (maintaining image quality for reconstructed imaging), thereby reducing operational complexity.
3Ease of operation
If the grating is removed from the field of view to capture absorptive images, then the capturing process is simplified, but the Talbot interferometer functionality is lost
Solution Approach 1:
The patent makes the Talbot interferometer system universal by enabling it to perform multiple functions: capturing absorptive images in low visibility mode and capturing reconstructed images in full visibility mode. The system achieves this multi-functionality through controller-managed adjustment of grating positions, eliminating the need to physically remove gratings while maintaining both imaging capabilities.
Solution Approach 2:
The patent uses parameter changes (specifically, adjusting the relative position between gratings) to transform the Talbot interferometer's output from high-visibility moire fringes to low-visibility moire fringes. This parameter adjustment allows the system to capture absorptive images without removing the gratings, thus preserving the interferometer's functionality while simplifying the capturing process.
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 generation of absorptive images efficiently without grating movement, reducing false images and capturing time, and allowing for easy positioning and calibration of the subject and grating systems.
Implementation Method 1
a Talbot interferometer or a Talbot-Lau interferometer that captures a moire fringe image
Implementation Method 2
using a scatterer to minimize moire fringe visibility
Implementation Method 3
a radiation capturing system using a Talbot interferometer or a Talbot-Lau interferometer
Implementation Method 4
a Talbot interferometer or a Talbot-Lau interferometer to capture a moire fringe image
Data Source
AI summary
A radiation capturing system includes the following. A radiation source, a plurality of gratings, and a radiation detector, are provided aligned in a radiation irradiating axis direction. A Talbot interferometer or a Talbot-Lau interferometer captures a moire fringe image for generating a reconstructed image. A low visibility capturing unit performs capturing of the moire fringe image with visibility of a moire fringe reduced more than in capturing of the moire fringe image for generating the reconstructed image. A generating unit generates an absorptive image based on the moire fringe image captured by the low visibility capturing unit.