Conformable Membrane Acoustic Coupling for Workpiece Inspection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current evaluation devices for workpieces, particularly those with irregular surfaces or containing voids, delaminations, or impurities, struggle to effectively monitor structural integrity using acoustic signals without the interference of air or fluid couplants, limiting their ability to detect subsurface anomalies.
Innovation Solution
The apparatus employs a fluidic container with a conformable membrane and acoustic transducers to generate and receive ultrasonic waves directly on the workpiece surface, using a vacuum to ensure fluidic coupling without interposed air or fluid, allowing for in-situ monitoring of workpieces with either a two-sided through-transmission or one-sided reflective configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acoustic signals are used to monitor structural integrity of workpieces with irregular surfaces, then subsurface anomalies can be detected, but air or fluid couplants interfere with the acoustic signals reducing detection accuracy
Solution Approach 1:
The patent removes the harmful air/fluid couplant layer from between the transducer and workpiece surface by using a conformable membrane that directly contacts the irregular surface. This extraction of the interfering medium allows acoustic signals to pass through without attenuation or distortion, resolving the contradiction between detection accuracy and harmful interference.
Solution Approach 2:
The conformable membrane acts as an intermediary element that bridges the transducer and the irregular workpiece surface. It provides a continuous acoustic coupling path without requiring external couplants, allowing acoustic energy to transfer efficiently while eliminating the harmful effects of air gaps or fluid interference.
2Adaptability or versatility
If conventional evaluation devices are used on workpieces with irregular surfaces, then portability is reduced, but the ability to conform to complex surfaces is limited
Solution Approach 1:
The conformable membrane is designed to be flexible and adaptable, changing its shape to match the irregular workpiece surface it contacts. This dynamic adaptation allows the device to conform to complex geometries while maintaining acoustic coupling, achieving high adaptability without requiring a complex rigid structure that would reduce portability.
Solution Approach 2:
The patent employs a thin, flexible membrane that can conform to irregular surfaces. This flexible film structure provides the necessary adaptability to contact complex geometries while remaining lightweight and portable, resolving the contradiction between adaptability and device complexity.
3Reliability
If fluid couplants are used for acoustic coupling, then acoustic wave transmission is improved, but the need for immersion or couplant application increases device complexity and operation time
Solution Approach 1:
The conformable membrane provides self-contained acoustic coupling without requiring external couplants. The membrane itself serves as the acoustic transmission medium, eliminating the need for separate couplant application steps, immersion procedures, or cleanup operations. This self-service approach maintains reliable acoustic wave transmission while significantly reducing operation time and simplifying the operational 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
This solution enables accurate detection of acoustic waves reflected from the workpiece, providing effective monitoring of structural integrity and defect detection without the need for immersion or fluid couplants, enhancing the ability to inspect complex surfaces and subsurface anomalies.
Implementation Method 1
An acoustic source transducer is disposed in the cavity of the fluidic container and in contact with the acoustic transmission fluid. The acoustic source transducer is disposed to generate a first acoustic wave in the direction of the workpiece.
Implementation Method 2
The conformable membrane is disposed to sealably contain the acoustic transmission fluid within the fluidic container and to conform to a surface of a portion of the workpiece absent an interposed fluid.
Implementation Method 3
An acoustic receiving transducer is disposed to monitor a residual acoustic wave that is reflected from the workpiece in response to the first acoustic wave.
Data Source
AI summary
An apparatus for in-situ monitoring of a workpiece includes a fluidic container defining a cavity and having a peripheral portion that defines an aperture. The fluidic container contains an acoustic transmission fluid. A conformable membrane is sealably disposed about the peripheral portion of the aperture of the fluidic container. The conformable membrane is disposed to sealably contain the acoustic transmission fluid within the fluidic container and to conform to a surface of a portion of the workpiece absent an interposed fluid. An acoustic source transducer is disposed in the cavity of the fluidic container and in contact with the acoustic transmission fluid. The acoustic source transducer is disposed to generate a first acoustic wave in the direction of the workpiece. An acoustic receiving transducer is disposed to monitor a residual acoustic wave that is reflected from the workpiece in response to the first acoustic wave.