An automatic compact Schlieren imaging system for ultrasound transducer testing

Area of Science:

• Acoustics
• Ultrasonics
• Optical Imaging

Background:

• Hydrophone techniques are standard for ultrasonic transducer characterization but are time-consuming, invasive, and costly.
• Existing Schlieren techniques for visualizing ultrasonic beams require large, cumbersome equipment.

Purpose of the Study:

• To develop a compact, low-cost, and efficient system for characterizing ultrasonic transducers.
• To overcome the limitations of hydrophone and traditional Schlieren methods.

Main Methods:

• Utilized a modified Schlieren technique for real-time ultrasonic beam visualization.
• Integrated acoustic tomography for beam reconstruction at any height.
• Employed commercial components for a low-cost system design.

Main Results:

• Developed a compact system (1m x 0.3m) capable of imaging acoustic beams up to 200mm.
• Achieved quantitative analysis and beam reconstruction capabilities.
• The system is suitable for transducers up to 40 MHz and above.

Conclusions:

• The developed ultrasonic beam analyzer offers a cost-effective and compact alternative to traditional methods.
• This system enables efficient and accurate characterization of a wide range of ultrasonic transducers.