3. Experimental tools
1) Ultrasonic detector
It is widespread use of equipment that used in ultra sonic testing. And it also have lots of control function.
2) probe
A protected face transducer is a single element longitudinal wave contact transducer that can be used with either a delay line, protective membrane, or protective wear cap.
3) couplant A couplantis a material (usually liq
Ⅰ. 맥파(Pulse wave)
1. 개요
맥파는 좌심실로부터 혈액이 대동맥으로 구출됨과 동시에 대동맥이 확장되면서 생성된 위치에너지가 운동에너지로 상호전환되면서 혈관벽을 따라 말초로 이동하는 일종의 파동을 의미한다.
맥파는 검출방법에 따라 압맥파(pressure wave)와 광용적맥파(PPG: photoplethysmography)
Density of steel 7800
Poisson’s ratio 0.32
The resultant data(velocity) = 5666.7
From this formula, we could determine the modulus of elasticity,
Theoritical value of E of steel is 200GPa, error would be
Fig.1 Property of materials.
2. Considerations
We could figure out material's properties and method of finding defect of the specimen. Ultrasonic wave value was alm