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 vibrationCs tanδ => LCR meter at 1KHz 1Vrms PZT-82 is equal to PZT-8, hard PZT for higher mechanicalquality factor, lower dielectric loss required and much higher power handlingcapability 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
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