White ABS 105dB PZT Piezoelectric Transducer With Plug 30mm Reverse
|Min. Sound Pressure Level(dB)||105/125Vp-p Square Wave/3.3kHz/1 Foot|
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The disadvantages of EMAT:
1. Low transduction efficiency. EMAT transducers typically produce
raw signal of lower power than piezoelectric transducers. As a
result, more sophisticated signal processing techniques are needed
to isolate signal from noise.
2. Size constraints. Although there are EMAT transducers as small
as a penny, commonly used transducers are large in size.
Low-profile EMAT problems are still under research and development.
Due to the size constraints, EMAT phased array is also difficult to
be made from very small elements.
3. Caution must be taken when handling magnets around steel
EMAT has the following advantages:
1. No couplant is needed. Based on the transduction mechanism of
EMAT, couplant is not required. This makes EMAT ideal for
inspections at temperatures below the freezing point and above the
evaporation point of liquid couplants. It also makes it convenient
for situations where couplant handling would be impractical.
2. EMAT is a non-contact method. Although proximity is preferred, a
physical contact between the transducer and the specimen under test
is not required.
3. Dry Inspection. Since no couplant is needed, the EMAT inspection
can be performed in a dry environment.
4. Less sensitive to surface condition. With contact-based
piezoelectric transducers, the test surface has to be machined
smoothly to ensure coupling. Using EMAT, the requirements to
surface smoothness are less stringent; the only requirement is to
remove loose scale and the like.
5. Easier for sensor deployment. Using piezoelectric transducer,
the wave propagation angle in the test part is affected by Snell’s
law. As a result, a small variation in sensor deployment may cause
a significant change in the refracted angle.