Multi-Frequency Ultrasonic Phased Array for Broader Defect Imaging
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Solution Overview
Problem
Existing ultrasonic phased array imaging devices are limited by a single resonance frequency, restricting the resolution and detection of various defect types in inspected objects.
Innovation Solution
A multi-frequency ultrasonic phased array imaging device using piezoelectric elements with different resonance frequencies, allowing for the generation of linear and non-linear images through controlled operation signals, enabling detection of diverse defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoelectric elements with the same resonance frequency are used in a single phased array transducer, then the device structure is simple, but only images with limited resolution can be obtained and some defects cannot be detected
Solution Approach 1:
The transducer is segmented into multiple groups of piezoelectric elements, where each group contains elements with different resonance frequencies (first, second, and third piezoelectric elements with progressively lower frequencies). This segmentation allows each frequency group to detect different types of defects, thereby improving both image resolution and detection versatility without requiring a completely separate transducer for each defect type.
2Adaptability or versatility
If piezoelectric elements with various resonance frequencies are used, then multiple types of defects can be detected with various resolutions, but the transducer structure becomes more complex
Solution Approach 1:
Multiple piezoelectric elements with different resonance frequencies are merged into a single phased array transducer structure. The first, second, and third piezoelectric elements are integrated within the same transducer housing and control system, allowing multi-frequency operation while maintaining a unified device structure. This merging approach achieves versatile defect detection without proportionally increasing overall device complexity.
3Ease of operation
If a single frequency phased array transducer is used, then the device is simple to operate, but detection is limited to specific defect types and sizes
Solution Approach 1:
The control system operates different piezoelectric element groups in a periodic or selective manner, activating first, second, and third piezoelectric elements based on the specific inspection requirements. This periodic activation of different frequency groups allows the device to maintain ease of operation through automated frequency selection while improving detection reliability by matching the appropriate frequency to the defect type being inspected.
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 the output of images with varying resolutions, detecting defects that conventional devices miss, including closed defects and material deformations, by employing piezoelectric elements with distinct resonance frequencies.
Implementation Method 1
Transducers includes piezoelectric elements for transmission and reception of ultrasonic waves
Implementation Method 2
at least one first piezoelectric element having a high resonance frequency and at least one second piezoelectric element having a resonance frequency lower than that of the first piezoelectric element
Implementation Method 3
receive an ultrasonic signal reflected from the object to be inspected
Data Source
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AI summary
The present invention relates to a complex multi-frequency ultrasonic phased array imaging device comprising: a transducer, which transmits a phased array ultrasonic signal to an object to be inspected, receives an ultrasonic signal reflected from the object to be inspected, and includes at least one first piezoelectric element having a high resonance frequency and second piezoelectric element having a resonance frequency lower than that of the first piezoelectric element; a control unit for controlling operations of the first piezoelectric element and the second piezoelectric element by applying an operation signal to the transducer; and a portable imaging unit, which calculates an operation signal applied from the control unit and an ultrasonic signal received in the transducer as a delay-sum for a phased array image, thereby outputting the same as a phased array image.