EMAT vs PIEZO
 |
Comparison of Piezo- and EMAT-technology for emitting/receiving of ultrasound |
| Conditions of testing |
PIEZO-technology |
EMAT-technology |
|
Dirty surface of object |
no |
yes |
|
Testing of moving objects at high speed |
normally up to 1.5 m/s |
without any limitation |
|
Curvature of test object |
has a big influence on test results |
yes |
|
Low temperature of object or of environment |
normally for range -10…+90 Celsius deg. |
without any limitation |
|
Hot objects (up to 1200 Celsius degree) |
normally up to +90 Celsius deg (see below note 2*) |
yes |
Note:
1* - practical limit is 15 m/s at restrictions of test conditions and at the using special actions for providing of stability of acoustic contact;
2* - practical limit is up to 300 Celsius degree at restrictions for test conditions for providing of acoustic contact and at restriction of productivity of testing (not typical for mass using).
