Deformation Detection via Phase Image Difference
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Solution Overview
Problem
Existing methods for detecting object deformation face difficulties in distinguishing small interference line distances due to superimposed disturbances, making defect detection challenging, especially in cases of large deformations.
Innovation Solution
A method that involves taking a sequence of pictures during object deformation, calculating phase images, and forming differences between current and initial state images, which can be evaluated and displayed to isolate relevant deformations, improving picture quality and evaluation by employing spatial and time-based filter algorithms and coherent radiation like laser light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase image evaluation is used to detect deformation, then measurement precision is improved, but disturbance interference makes interference line distances too small to distinguish
Solution Approach 1:
The patent segments the deformation measurement process by separating whole-body deformation from local defect deformation. This is achieved by taking multiple pictures during the deformation process and calculating phase images for each picture, then evaluating differences between phase images to isolate local deformations from global movements.
Solution Approach 2:
The patent performs preliminary action by taking a reference picture before deformation and calculating a reference phase image. This reference phase image is used to subtract from subsequent phase images, pre-establishing a baseline that enables later isolation of defect-specific deformations from disturbance deformations.
2Reliability
If multiple pictures are taken during deformation to improve evaluation reliability, then detection reliability is improved, but processing complexity increases
Solution Approach 1:
The patent maintains continuity of useful action by continuously taking pictures during the entire deformation process and continuously calculating phase images from each picture. This continuous measurement approach ensures that the complete deformation sequence is captured, improving reliability while the automated processing maintains efficiency.
Solution Approach 2:
The patent implements feedback by evaluating the difference between current phase images and reference phase images, then using this difference information to identify defect locations. The system feeds back the deformation information to continuously refine the defect detection 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 continuous observation and differentiation of deformation sequences, allowing for the detection of defect-typical deformations and improving the evaluation process by isolating relevant deformations from whole-body movements, enhancing the detection of defects in materials and tires.
Implementation Method 1
The imaging optics is formed or adjusted such that the image of a speckle produced on the body by the coherent radiation covers at least three sensor elements (pixels) in the image plane.
Implementation Method 2
The object can be irradiated with coherent radiation or coherent light, preferably laser light
Implementation Method 3
The reflected radiation is imaged by an imaging optics in an image plane in which a sheet-like sensor or an image sensor is provided
Implementation Method 4
A reference radiation with a carrier frequency is superimposed on the sensor. The phase of the radiation from the object is determined from the intensity signals of the sensor elements.
Data Source
AI summary
In a method for detecting the deformation of objects (1), a sequence of pictures of the object (1) is taken with a measurement method during the deformation of the object (1). From the pictures, phase images are determined. To improve such method, there is formed the difference between the current phase image or the respective current phase image and the phase image of an initial state. This difference or these differences is/are evaluated and/or displayed on a visual display unit and/or stored.