Curved Ultrasonic Test Probe for Angular Intromission
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Solution Overview
Problem
The DGS-method for ultrasonic testing experiences large deviations in measurements when sound is introduced at angular intromission into curved workpiece surface areas, depending on the type of test probe used, making it difficult to interpret and evaluate echo signals effectively.
Innovation Solution
A test probe with an ultrasonic transducer and delay line is designed to transfer the sound field from a perpendicular test probe to an angular transducer, ensuring the sound field remains rotationally symmetrical within the workpiece, even across non-planar surfaces, by adjusting the delay line's coupling surface to match the workpiece geometry and using Fermat's principle to calculate the optimal transducer shape and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional test probe with planar transducer is used for angular intromission into curved workpiece surfaces, then the device complexity remains simple, but the measurement precision deteriorates due to large deviations in echo signals
Solution Approach 1:
The transducer surface is designed with a specific curvature that corresponds to the workpiece surface geometry (e.g., cylindrical radius). This curved transducer surface ensures proper acoustic coupling and maintains a rotationally symmetrical sound field when inspecting curved workpiece surfaces, thereby improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent modifies the geometric parameters of the transducer (surface curvature, orientation angle) to match the workpiece characteristics. By changing these parameters, the sound field becomes rotationally symmetrical relative to the workpiece surface normal, eliminating measurement deviations while keeping the overall device structure relatively simple
2Loss of information
If the transducer surface is adapted to match curved workpiece geometry, then the interpretability of ultrasonic signals improves, but the ease of manufacture deteriorates
Solution Approach 1:
The transducer surface is designed with a specific curvature that corresponds to the workpiece surface geometry (e.g., cylindrical radius). This curved transducer surface ensures proper acoustic coupling and maintains a rotationally symmetrical sound field when inspecting curved workpiece surfaces, thereby improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent modifies the geometric parameters of the transducer (surface curvature, orientation angle) to match the workpiece characteristics. By changing these parameters, the sound field becomes rotationally symmetrical relative to the workpiece surface normal, eliminating measurement deviations while keeping the overall device structure relatively simple
3Adaptability or versatility
If a perpendicular test probe is used for planar surfaces, then the sound field is rotationally symmetrical and easy to evaluate, but the adaptability to curved surfaces and angular intromission deteriorates
Solution Approach 1:
The transducer surface is designed with a specific curvature that corresponds to the workpiece surface geometry (e.g., cylindrical radius). This curved transducer surface ensures proper acoustic coupling and maintains a rotationally symmetrical sound field when inspecting curved workpiece surfaces, thereby improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent modifies the geometric parameters of the transducer (surface curvature, orientation angle) to match the workpiece characteristics. By changing these parameters, the sound field becomes rotationally symmetrical relative to the workpiece surface normal, eliminating measurement deviations while keeping the overall device structure relatively simple
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 design improves the interpretability of ultrasonic signals by maintaining a rotationally symmetrical sound field, allowing for accurate determination of reflector sizes in workpieces using the DGS-method, even under non-planar intromission conditions, with minor deviations corrected by empirical factors for pulsed ultrasound.
Implementation Method 1
an ultrasonic transducer (20) for the generation of an ultrasonic field
Implementation Method 2
for the non-destructive testing of a workpiece (100) by means of ultrasonic sound
Implementation Method 3
The delay line body (12) on its part is provided for a coupling of the ultrasonic field to be fitted into the workpiece (100)
Implementation Method 4
using Fermat's principle to calculate the optimal transducer shape and orientation
Data Source
Figure 1~2
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AI summary
The invention relates to a test probe 10 for the non-destructive testing of a workpiece by means of ultrasonic sound. The test probe has an ultrasonic transducer 20 for the generation of an ultrasonic field, which is coupled acoustically to a delay line body 12, which is provided to be attached for a coupling of the ultrasonic field into the workpiece on a surface of the workpiece. Furthermore, the invention relates to a family of test probes as well as to a testing device for the non-destructive testing of a workpiece by means of ultrasonic sound, with a test probe 10, whose ultrasonic transducer 20 has a majority of independently controllable individual oscillators. Furthermore, a control unit 50 is provided, which is equipped to control the individual oscillators of the ultrasonic transducer 20 with phase accuracy in such a way, that a sound field rotationally symmetrical to the central beam is generated. The test probe or the family of test probes and the testing device are suitable in particular for the angular intromission of sound or for a utilization on curved workpiece surface areas.