A research team at the Daegu Gyeongbuk Institute of Science and Technology (DGIST), led by Professor Chang Jin Ho, has engineered a groundbreaking screw lens-focused ultrasound transducer. This cutting-edge innovation is specifically designed to inspect micro-defects inside semiconductor chips with unprecedented precision. Such advancements heavily support the burgeoning optics articles landscape by introducing novel engineering solutions to industrial quality control.
The technology directly addresses the strict reliability requirements demanded by power semiconductors utilized within electric vehicles and aerospace applications. Traditional non-destructive testing configurations often struggle with internal edge noise caused by unwanted wave reflections inside compact lenses. By resolving these longstanding acoustic hurdles, the new system opens fresh perspectives akin to findings typically explored in detailed product reviews.
Engineering the Screw Lens Innovation
Conventional ultrasonic testing methods are frequently hampered by irregular background noise generated when waves reverberate off the inner boundaries of small lenses. To combat this interference, the DGIST team drew inspiration from the wedge-shaped sound-absorbing structures found on the walls of specialized anechoic chambers.
Surface Modifications and Wave Scattering
Researchers meticulously engraved slanted, screw thread-shaped grooves directly onto the side surfaces of the ultrasonic lens. These specialized microscopic grooves successfully scatter sideways-traveling ultrasonic waves in multiple directions, neutralizing the source of internal noise.
Through extensive computer simulations, the team determined the optimal thread configuration requires a 500-micrometer height paired with a 30-degree inclination angle. This precise balance effectively dampens acoustic reflection without sacrificing the structural integrity of the apparatus.
Practical Integration and Future Potential
Because the acoustic modifications are restricted entirely to the outer boundary of the lens, the design easily integrates into existing compact industrial hardware. Manufacturers can adopt the technology without needing to expand sensor footprints or redesign legacy inspection machinery. Similar hardware precision is frequently discussed in literature covering microscopes and advanced diagnostic instruments.
Rigorous testing performed on automotive power module chips demonstrated that the screw lens can reveal internal microstructures and micro-defects with a clarity rivaling traditional computed tomography scans. This milestone successfully overcomes historical limitations and clears the path for mass-producing ultra-high-frequency ultrasonic transducers operating reliably above 100 MHz. The revolutionary findings were formally documented in the esteemed non-destructive testing journal NDT & E International.
Here is the source article for this story: “A Screw Lens Is Used to Visually Inspect Micro-defects in Semiconductor Chips.” DGIST Has Developed a High-Resolution Ultrasound Transducer.
