Talbot Interference Grating Attitude Adjustment
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Solution Overview
Problem
In Talbot interference imaging apparatus, the attitude of diffraction or absorption gratings must be precisely adjusted to maintain optimal imaging quality, as displacement leads to increased noise ratios and deteriorated image quality, particularly in X-ray Talbot interference systems.
Innovation Solution
An imaging apparatus with a diffraction grating and an absorption grating, where an adjusting unit divides the intensity distribution of the detected electromagnetic waves into regions and adjusts the gratings based on the intensity information of these regions, using Fourier transforms to optimize the attitude of the gratings for improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the attitude of the diffraction grating or absorption grating is displaced from the suitable attitude, then the imaging apparatus can operate, but the noise ratio to the acquired phase image or differential image increases, deteriorating image quality
Solution Approach 1:
The imaging apparatus automatically adjusts the attitude of the diffraction grating or absorption grating by detecting the intensity distribution of the interference pattern and calculating the suitable attitude, eliminating the need for manual adjustment and ensuring optimal imaging quality without operator intervention
Solution Approach 2:
The system uses the detected intensity distribution of the interference pattern as feedback to calculate and adjust the grating attitude, creating a closed-loop control system that continuously optimizes image quality by comparing actual detection results with the desired interference pattern characteristics
2Reliability
If manual adjustment of grating attitude is performed, then image quality can be optimized, but the operating time and complexity increase
Solution Approach 1:
The apparatus performs self-adjustment of the grating attitude by automatically detecting the interference pattern intensity distribution and calculating the optimal orientation, eliminating time-consuming manual adjustment procedures while maintaining high image quality
Solution Approach 2:
The system pre-calculates and determines the suitable grating attitude based on the detected interference pattern characteristics before actual imaging occurs, allowing the grating to be positioned optimally in advance and eliminating the need for time-consuming trial-and-error adjustment during operation
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 approach enables the acquisition of high-quality phase or differential images by reducing noise and ensuring consistent image quality across the imaging range by adjusting the gratings according to calculated Carrier to Noise Ratios or visibility values.
Implementation Method 1
a diffraction grating which diffracts electromagnetic waves from an electromagnetic wave source
Implementation Method 2
an absorption grating which absorbs a part of the electromagnetic waves diffracted by the diffraction grating
Implementation Method 3
Talbot interference uses an interference of electromagnetic waves having various wavelengths including light or an X-ray to measure a form or composition of a subject
Data Source
AI summary
An imaging apparatus includes a diffraction grating which diffracts electromagnetic waves from an electromagnetic wave source, a shield grating which shields a part of the electromagnetic waves diffracted by the diffraction grating, a detector which detects an intensity distribution of the electromagnetic waves through the shield grating, and an adjusting unit which adjusts the attitude of at least one of the diffraction grating and the shield grating on the basis of the detection result by the detector, wherein the adjusting unit divides the intensity distribution detected by the detector into a plurality of regions and adjusts the attitude of at least one of the diffraction grating and the shield grating on the basis of the intensity distributions of the plurality of regions.