|
Overview
BM941 has a low mechanical Q and low acoustic impedance. These ceramics are made of modified lead metaniobate formulations. These materials are used in seismic sensors, medical and non-destructive evaluation applications, where low QM and clean impluse responses are required. The material has a higher dielectric constant than BM901 material.
Features
- Low QM
- Clean impulse response
- Low acoustic impedance
Applications
- Immersion work in NDE
- Thickness measurement
- Non-destructive evaluation (NDE)
- Transducers
| Relative Dielectric Constant |
KT33 |
725 |
— |
| Dissipation Factor |
Tan d |
1 |
% |
| Coupling Factor |
kp |
0.2 |
— |
| |
k31 |
0.14 |
— |
| |
k33 |
0.45 |
— |
| Charge Constant |
d31 |
-40 |
10-12 C/N |
| |
d33 |
165 |
10-12 C/N |
| Voltage Constant |
g31 |
-7 |
10-3 Vm/N |
| |
g33 |
27 |
10-3 Vm/N |
| Mechanical Quality Factor |
QM |
15 |
— |
| Frequency Constants 2 |
Np |
3250 |
Hz.m |
| |
N1 |
1700 |
Hz.m |
| |
N4 |
1725 |
Hz.m |
| Compliance |
SE11 |
7.4 |
10-12 m2 /N |
| |
SE33 |
21 |
10-12 m2 /N |
| Density |
r |
5.8 |
g/cm3 |
| Curie Temperature |
Tc |
280 |
°C |
| Coupling Factor |
kp |
-0.5 |
— |
| Dielectric Constant |
kT33 |
-1 |
— |
| Frequency Constant |
Np |
0.5
|
Hz.m |
|
.jpg)
Notes:
1 Low field parameters;
measured at 1 KHz
2 NP - Planar
N1 - Longtitudinal
N - Thickness
3 Reference point of time;
24 hours after polarization
|
