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Ultrasonography

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...

Ultrasound I: Abdominal Ultrasonography

Ultrasound I: Abdominal Ultrasonography

Introduction:
Abdominal ultrasonography, commonly known as abdominal ultrasound, is a vital, non-invasive medical imaging technique widely used in healthcare.
Procedure:
This diagnostic tool allows the clinician to visually inspect internal structures within the abdomen, including vital organs such as the liver, gallbladder, pancreas, kidneys, and spleen.
The abdominal ultrasound process begins with applying a special gel to the patient's skin over the abdomen. This gel enhances the...

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Universal Hand-held Three-dimensional Optoacoustic Imaging Probe for Deep Tissue Human Angiography and Functional Preclinical Studies in Real Time

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Ultrasonic diffuse bulk wave passive array imaging of internal defects in a complex structure.

Zhengjun Wang¹, Fan Shi¹

¹Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong Special Administrative Region, China.

|May 31, 2024

Summary

This summary is machine-generated.

This study introduces an ultrasonic passive array imaging method to detect internal defects in complex components like turbine blades. The technique uses diffuse waves and a laser vibrometer for in-situ inspection where traditional probes fail.

Keywords:

Array imaging Complex structure Diffuse field Laser vibrometer Non-destructive evaluation Ultrasonic damage detection

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Area of Science:

Non-destructive testing
Ultrasonic wave propagation
Materials science

Background:

Inspecting defects in safety-critical components with complex geometries, like turbine blades, is challenging for traditional ultrasonic methods.
Commercial phased array probes struggle with irregular external boundaries, limiting in-situ imaging capabilities.
Irregular component shapes generate diffuse elastic wavefields, which can be leveraged for imaging.

Purpose of the Study:

To develop and evaluate an ultrasonic passive array imaging method for internal defect detection in complex geometries.
To overcome the limitations of conventional ultrasonic probes on irregular surfaces.
To utilize diffuse reverberation for high-resolution subsurface imaging.

Main Methods:

Excitation of elastic diffuse waves using active piezoelectric actuators.
Reception of diffuse waves by a scanning laser vibrometer at multiple points.
Passive full matrix capture (FMC) signal extraction and defect imaging via the total focusing method.

Main Results:

Successful implementation of an ultrasonic passive array imaging method using diffuse reverberation.
Numerical simulations demonstrated the method's potential for defect imaging.
Experimental validation on a turbine blade-like structure confirmed the imaging capabilities.

Conclusions:

The proposed ultrasonic passive array imaging method is effective for inspecting defects in components with complex external geometries.
Diffuse wavefield utilization offers a viable alternative to traditional methods for in-situ inspection.
The technique shows promise for enhancing the safety and reliability of critical components.