[1] Gas sensor based on novel guided wave -- collimating surface acoustic wave on sphere –

　　We have developed a ball SAW hydrogen sensor with best performance among SAW sensors.

Publications

[1-1] Ball SAW device for hydrogen gas sensor

[1-2] Delay time and amplitude response (10 ppm H2)

[2] Novel ultrasonic testing (UT) of cracks --Subharmonic ultrasound for detection and evaluation of closed cracks –

We developed a new theory to describe the dependence of subharmonic intensity on the crack closure stress [2-1], which successfully explained the experimental result [2-2]

Publications

[2-1] Evaluation of nanoscalce cracks by low-pass filter effect in nonlinear ultrasound
[2-2] Fatigue crack closure analysis using nonlinear ultrasound