Piezoelectric ceramic hemisphere
Electrode direction: thickness direction
Applications: High Intensity Focused Ultrasound, high power ultrasonic transducer
Focused ultrasound system has good tissue penetration and localization. It can focus energy through surface tissue and target tissue at a specific depth to produce biological effects, which can make the pathological tissue recover quickly. The dosage of focused ultrasound therapy is easy to control and safe. After treatment, only local tissue has transient congestion and edema, and surface cells can remain intact, quick recovery.
Ultrasound focusing has good tissue penetration and energy storage. The host generates high-frequency electrical signals, which are converted into focused ultrasound by transducer. The ultrasound is transmitted to the lesion tissues by circulating water system, sound transmission membrane and contact coupling agent. Ultrasound can produce thermal effect, mechanical effect, cavitation effect and biochemical effect in biological tissues. Polaris uses these characteristics to act on pathological tissues to degenerate them, promote tissue reconstruction and improve microcirculation to achieve therapeutic purposes.
Material: PZT-82( hard PZT P-8)
Technical data:
Dimensions: diameter 19.5mm, thickness according to frequency 4MHz, R 19
Thickness Frequency Ft: 4MHz ± 100KHz
Radial Frequency Fr: 112KHz ± 5%
Electromechanical coupling coefficient Kp: ≥ 0.57
Resonant impedance Zm: ≤ 3 Ω
Dielectric Loss tg δ: 0.3%
Static capacitance Cs: 7200pF± 20%
Test Condition: 25±3 °C 40~70% R.H.
fr, Zm, Kr => Radial mode vibration
Cs tanδ => LCR meter at 1KHz 1Vrms
PZT-82 is equal to PZT-8, hard PZT for higher mechanical
quality factor, lower dielectric loss required and much higher power handling
capability etc. transducers.
YUHAI piezo material for HIFU systerm:
Typical value of piezoelectric ceramic materials
performance
"Hard" PZT materials
Properties
PZT-41
PZT-42
PZT-43
PZT-82
Dielectric
Constant
ɛTr3
1050
1250
1420
1100
Coupling
factor
KP
0.58
0.58
0.58
0.52
K31
0.32
0.33
0.34
0.3
K33
0.66
0.67
0.68
0.57
Kt
0.48
0.48
0.48
0.4
Piezoelectric
coefficient
d31
10-12m/v
-106
-124
-138
-100
d33
10-12m/v
260
280
300
240
g31
10-3vm/n
-11.4
-11.2
-11
-10.3
g33
10-3vm/n
28
25.3
24
25
Frequency
coefficients
Np
2280
2200
2160
2280
N1
1671
1613
1583
1671
N3
1950
1900
1875
1950
Nt
2250
2200
2200
2300
Elastic
compliance coefficient
Se11
10-12m2/n
11.8
12.7
13.2
11.6
Machanical
quality factor
Qm
1000
800
600
1200
Dielectric
loss factor
Tg δ
%
0.3
0.4
0.5
0.3
Density
ρ
g/cm3
7.5
7.5
7.5
7.6
Curie
Temperature
Tc
°C
320
320
320
310
Young's
modulus
YE11
<109N/m3
85
79
76
86
Poison Ratio
0.3
0.3
0.3
0.3
https://www.yhpiezo.com/hifu-piezoelectric-ceramic-parts/