Piezo- ceramic tangential tubes
The derived stress distribution formula in terms of the two layer cylindical tranducer revealed the circumferential stress of the Piezo Tube transducer is greater than the radial stress, according the scientific experiments of acoustic oil well logging.
The tangentially polarized Piezoelectric Ceramic tube is difficult to achieve full polarization and has a slightly higher polarization intensity, but when it works in the radial vibration mode (low frequency), its electromechanical coupling coefficient is k33, so its sensitivity is higher, and because the sound velocity V3 is higher, the resonance frequency can be lower under the same diameter condition.
Application: oilfield detection, ultrasonic pickups
Piezoelectric ceramic Material: PLiS-51 (modified PZT-5A)
| Piezoelectric Elements technical data: |
| Dimensions: | diameter 25.4mm, wall thickness 0.254mm, height 25.4mm 8 electrode strips |
| Silver width | 2mm |
| Thickness Frequency Fr: | 36KHz ± 5% |
| Mechanical Coupling coefficient Keff | ＞0.5 |
| Dielectric Loss tg δ: | < 2.2% |
| Static capacitance Cs: | >850pF±12.5% |
Test Condition: 25±3 °C 40~70% R.H.
fr, Zm, Kr => Radial mode vibration
Cs tanδ => LCR meter at 1KHz 1Vrms
Typical value of piezoelectric ceramic materials performance
| "Soft" PZT materials | | | | | | | | | |
| Properties | | | PSnN-5 | PLiS-51 | PZT-51 | PZT-52 | PZT-53 | PZT-5H | PZT-5X |
| Dielectric Constant | ɛTr3 | | 1600 | 2000 | 2200 | 2400 | 2600 | 3200 | 4500 |
| | | | | | | | | | |
| Coupling factor | KP | | 0.6 | 0.62 | 0.62 | 0.63 | 0.64 | 0.68 | 0.7 |
| | K31 | | 0.35 | 0.35 | 0.35 | 0.35 | 0.36 | 0.38 | 0.4 |
| | K33 | | 0.68 | 0.7 | 0.68 | 0.7 | 0.7 | 0.76 | 0.77 |
| | Kt | | 0.5 | 0.52 | 0.5 | 0.5 | 0.5 | 0.52 | 0.53 |
| Piezoelectric coefficient | d31 | 10-12m/v | -170 | -197 | -186 | -204 | -227 | -275 | -300 |
| | d33 | 10-12m/v | 400 | 450 | 500 | 520 | 550 | 620 | 750 |
| | g31 | 10-3vm/n | -12 | -11.1 | -9.6 | -9.8 | -9.9 | -9.7 | -7.5 |
| | g33 | 10-3vm/n | 28 | 25.4 | 25.6 | 24.5 | 23.9 | 22 | 18.8 |
| Frequency coefficients | Np | | 2000 | 1920 | 1980 | 1980 | 1960 | 1900 | 1960 |
| | N1 | | 1466 | 1407 | 1451 | 1451 | 1437 | 1393 | 1437 |
| | N3 | | 1825 | 1925 | 1900 | 1900 | 1755 | 1550 | 1800 |
| | Nt | | 2100 | 2100 | 2150 | 2150 | 2150 | 2100 | 2200 |
| Elastic compliance coefficient | Se11 | 10-12m2/n | 16.6 | 18 | 16.7 | 17 | 17.4 | 18 | 19 |
| Machanical quality factor | Qm | | 85 | 80 | 80 | 75 | 75 | 70 | 65 |
| | | | | | | | | | |
| Dielectric loss factor | Tg δ | % | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Density | ρ | g/cm3 | 7.5 | 7.5 | 7.6 | 7.6 | 7.6 | 7.5 | 7.5 |
| Curie Temperature | Tc | °C | 350 | 345 | 270 | 270 | 270 | 230 | 165 |
| Young's modulus | YE11 | <109N/m2 | 60 | 56 | 60 | 59 | 57.5 | 56 | 53 |
| Poison Ratio | | | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.39 |
Typical soft PZT characteristics include:
- Wide range of frequencies in transmit and receive (sub-audible, audible, ultrasonic)
- High output, low drive material
- High frequency, fast response time
- High sensitivity for active or passive use
- Ability to use with low voltage or high voltage drive circuits
- Good mechanical and acoustic coupling
- Wide variety of shapes and sizes that can be customized to meet specific requirements and applications
- Wide variety of compositions that can be selected to meet specific requirements and applications
- Quality of each PZT component is ensured by a rigorous testing regimen. Characteristics such as frequency, capacitance, dissipation, coupling, d33 and mechanical properties are measured and verified against our / customer provided specifications.
Typical soft PZT applications include:
· . Undersea exploration (sonar, beacons, imaging, current meters)
· Aerospace (gyroscopes, accelerometers, level sensing)
· Medical products (Doppler blood flow, oncology therapeutics (high intensity focused ultrasound), imaging, level sensing, intra-operative tools for ophthalmology (phacoemulsification), dental descaling, general surgery, tissue ablation, medication delivery, hearing enhancement, bubble detection)
· Consumer products (ultrasonic toothbrushes, jewellery cleaners, contact lens cleaners, computer hard drives, touch screen displays, integrated, ultra-thin speakers and cosmetic enhancement)
· Industrial and Commercial (flow and level sensors, ultrasonic cleaning, ultrasonic welding, intrusion alarms, fabric needle positioning, solder dispensing, machine vibration monitoring, bubble detection, sonochemistry for improved chemical mixing)
· Telecommunications (optical switching of telecom lines, buzzers and alarms, Haptics feedback, mobile phone cameras)
· Automotive (power seat controls, reversing/collision avoidance sensors, anti-knock sensors)
· Scientific research (nano positioning stages and analytical tools, scanning probe microscopy, advanced acoustics)
· Oil Exploration (flow and level sensors, down hole drill tool monitoring)
Contact Now
