Crystals (2) Flashcards
1
Q
Crystal
A
Crystals are the “heart” of a Transducer and can be made of different Piezoelectric Materials
2
Q
Natural Crystals
A
- Quarts
- Lithium Sulfate
3
Q
Polarized/Man-made Crystals
A
- Barium Titanate
- Lead Metaniobate
- Lead Zirconate
- Lead Zirconate Titanate
4
Q
Quarts Crystal are…
A
- Popular in past not anymore
- Stable chemically, electrically, thermally
- Insoluble
- Wear resistant
- Not efficient
5
Q
X-Cut Crystals
A
- Produce Longitudinal Waves (Compression)
- Most Common
- Cuts perpendicular to the X-axis
6
Q
Y-Cut Crystals
A
- Produce Transverse Waves (Shear)
- Rare
- Wave won’t pass through a liquid Couplant
- Must be bonded/glued to a part
7
Q
Litium Sulfate Crystal
A
- Efficient receiver
- Fragile
- Soluble
8
Q
What are some Polarized Ceramics/Man-made Crystals benefits?
A
- Efficient vibration generators
- Moisture resistant
- High temp operation
- Fragile
- Less efficient with age
