Non-destructive testing (NDT)- JCG Industrial Co., Ltd. Laboratory

1. Ultrasonic testing (UT)
With acoustic or vibration more than the human ear can hear frequencies
2. Radiographic testing (RT)
With ray penetration
3. Leak testing (LT)
By external pressure
4. Infrared thermographic testing (TT or IT)
With penetration and sensitivity to infrared heat
5. Acoustic emission testing (AT or AE)
The changes of  material  ; by the mechanical energy is converted to acoustic energy
6. Magnetic testing (MT)
With the case of magnetic force distribution 
7. Eddy current testing (ET)
By electromagnetic induction an electrically conductive material, measuring Changes of induction
8. Penetrant testing(PT) 
With capillary action
9. Visual testing (VT)
With visual aids plus a direct or indirect Inspection

ITEM	Surface	Secondary surface	Internal
Ultrasonic testing (UT)	Y	Y	Y
Radiographic testing (RT)	Y	Y	Y
Leak testing (LT)	Y	Y	Y
Infrared thermographic testing (TT or IT)	Y	Y	Y
Acoustic emission testing (AT or AE)	Y	Y	Y
Magnetic testing (MT)	Y	Y	N
Eddy current testing (ET)	Y	Y	N
Penetrant testing (PT)	Y	N	N
Visual testing (VT)	Y	N	N