Deformation Measuring Sheet Using Moiré Pattern Interference
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Solution Overview
Problem
Conventional methods for measuring deformation in structures, such as strain gauges and rulers, are prone to measurement errors and require the measurer to be near the measurement subject, making them inaccurate and inconvenient for monitoring structural deformations like those in concrete walls.
Innovation Solution
A deformation measuring method using a sheet with a first layer having a first pattern of line drawings and a second layer with a second pattern, where post-deformation image data is analyzed to quantify deformation, allowing for remote and accurate assessment of deformation without the need for the measurer to be near the measurement subject.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges or rulers are used for measuring deformation, then measurement can be performed, but measurement errors occur and the measurer must be near the measurement subject
Solution Approach 1:
The patent uses a sheet with patterns that creates a visual copy or representation of the deformation through moire patterns. Instead of directly measuring with instruments near the structure, the deformation is copied into the moire pattern that can be captured remotely by a camera, eliminating the need for the measurer to be physically close while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces mechanical measurement instruments (strain gauges, rulers) that require physical proximity with an optical system. The moire pattern technique substitutes mechanical contact-based measurement with non-contact optical imaging and image processing, allowing remote measurement while improving accuracy by eliminating human reading errors.
2Ease of operation
If the measurer is near the measurement subject, then direct measurement is possible, but the measurement process becomes inconvenient and less accurate
Solution Approach 1:
The deformation information is copied into the moire pattern formed by the overlay of first and second patterns on the sheet. This visual copy can be captured from a distance by imaging devices, making the measurement process convenient while preserving the accuracy of the deformation data through the interference pattern.
Solution Approach 2:
The sheet with moire patterns acts as an intermediary between the measurement subject and the measurement system. Instead of directly observing or contacting the structure, the moire pattern on the sheet serves as a mediator that encodes deformation information in a form that can be easily captured and analyzed remotely, improving both convenience and accuracy.
3Reliability
If conventional measuring methods are used, then deformation can be detected, but measurement errors arise from the measurement methods themselves
Solution Approach 1:
The patent creates a visual copy of the deformation state through moire patterns that can be objectively captured by imaging devices. This eliminates subjective human reading errors and instrumental measurement errors, improving both the reliability of detection and the precision of measurement by using optical pattern analysis instead of direct instrumental or manual measurement.
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 method enables quantitative and convenient inspection of deformation, reducing measurement errors and allowing for three-dimensional evaluation of deformation without the need for the measurer to be physically close to the measurement subject, thus improving accuracy and convenience.
Implementation Method 1
a first pattern that includes a plurality of line drawings extending in a first direction, and a second layer portion overlaid on the first layer portion and having a second pattern that includes a plurality of line drawings extending in a second direction different than the first direction... a post-deformation image including a post-deformation moire produced as a result of the post-deformation first pattern and second pattern being overlaid
Data Source
AI summary
At least one aspect of the present disclosure directs to a deformation amount measuring method is a method in which a sheet (101) is used that includes a first layer portion (111) having a first pattern (121) that includes a plurality of line drawings extending in a first direction, and a second layer portion (112) overlaid on the first layer portion (111) and having a second pattern (122) that includes a plurality of line drawings extending in a second direction different than the first direction. The method includes the steps of acquiring, from the sheet (101) that has been disposed on a measurement subject, post-deformation image data corresponding to a post-deformation image including a post-deformation moire produced as a result of a post-deformation first pattern (121) and second pattern (122) being overlaid and finding an amount of deformation of the measurement subject on the basis of the post-deformation image data.