V-Path TOF Correction for Ultrasonic Thickness Gauges
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Solution Overview
Problem
Existing non-destructive testing (NDT) methods, particularly ultrasonic thickness gauges, face inaccuracies due to V-Path errors when measuring thin materials, as they do not account for material-specific sound velocities and transducer variations, leading to suboptimal measurement accuracy and reduced transducer longevity.
Innovation Solution
A system and method that employs a calibration module to generate user-specific V-Path time of flight correction data, using a dual-element probe and software to compute real-time correction values, enabling accurate thickness measurements by accounting for individual transducer characteristics and material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pre-defined static V-Path correction data tables are used, then measurement accuracy is improved for standard materials, but accuracy deteriorates when accounting for actual material sound velocity and transducer wear
Solution Approach 1:
The system performs preliminary calibration by measuring the actual V-Path time of flight for each transducer on each calibration block before use. This preliminary action creates a personalized correction profile that accounts for manufacturing variances and wear, which is then stored and applied during measurement to maintain high accuracy across different materials and transducer conditions
Solution Approach 2:
The system incorporates feedback mechanisms where the actual measured V-Path time of flight from calibration blocks is used to generate correction data that feeds back into the measurement process. This feedback loop continuously refines the correction applied to subsequent measurements, adapting to actual material properties and transducer characteristics rather than relying on predetermined values
2Measurement precision
If hardware error correction circuits are used, then V-Path errors are corrected, but device complexity and material costs increase
Solution Approach 1:
The patent replaces hardware error correction circuits with a software-based correction system. Instead of using complex electronic circuits to correct V-Path errors, the system uses software algorithms that process correction data derived from calibration measurements. This substitution reduces hardware complexity and material costs while maintaining or improving correction accuracy through more flexible computational methods
3Ease of manufacture
If empirical V-Path tables generated from batch transducers are used, then manufacturing cost is reduced, but measurement accuracy deteriorates due to transducer variations
Solution Approach 1:
The system segments the correction data into individual transducer-specific profiles rather than using a single empirical table for all transducers. Each transducer is calibrated separately on multiple calibration blocks, and its unique V-Path characteristics are stored as an individual profile. This segmentation allows each transducer to receive personalized correction data that accounts for its specific manufacturing variations and wear condition
Solution Approach 2:
The system applies local quality by creating transducer-specific correction profiles that are tailored to each individual transducer's characteristics. Instead of applying a generic empirical correction to all transducers of the same model, the system adapts the correction parameters to match the specific transducer's actual performance, thereby improving measurement precision for each individual device
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 enhances measurement accuracy, extends transducer longevity, and improves accuracy for generic transducers by providing personalized V-Path correction data, reducing errors and unnecessary maintenance costs.
Implementation Method 1
a probe configured to launch acoustical waves into a test object and to receive returning waves
Implementation Method 2
the energy path traveled by the acoustic wave after the energy is transmitted into the target material and reflected from the back-wall of the material
Implementation Method 3
compute a time of flight value of the acoustical waves launched from the probe
Data Source
AI summary
A system and method for carrying out non-destructive testing and inspection of test objects to assess their structural integrity uses a calibration module configured to provide V-Path time of flight (TOF) correction data over a plurality of object thickness points, obtained from an object or objects having known thicknesses using the same physical probe as is used for the inspection measurements. When a probe launches acoustical waves into a test object and an instrument and a control system compute a time of flight value of the acoustical waves launched by the probe, the pre-obtained V-Path TOF correction data is used to correct the measured time of flight computed by the instrument.