Yujie Hollow Sphere & Ball-Shaped Piezoelectric Element Series
Features & Applications
Yujie's specialized hollow sphere (ball-shaped) piezoelectric elements engineered for omnidirectional ultrasonic wave generation and detection. Yujie's spherical shell PZT transducer series features unique hemispherical geometry with radial coupling coefficient Kr 0.4 and frequencies from 30 to 320 kHz. Available in diameters from 5mm to 50mm with multiple capacitance formulations (P-33, P-52, P-81), these hollow ball piezoelectric ceramics excel in underwater acoustics, hydrophone arrays, and spherical wave field applications requiring uniform radiation patterns.
Primary Applications & Unique Advantages
- • Underwater Hydrophones & Sonar: Omnidirectional sensitivity pattern ideal for passive listening and active sonar applications. Sizes from SΦ5mm (320 kHz) to SΦ50mm (30 kHz) cover full frequency spectrum
- • Acoustic Calibration Sources: Spherical wave propagation provides known reference field for calibrating ultrasonic measurement equipment and transducers
- • Medical Ultrasound Research: Spherical elements enable omnidirectional therapeutic ultrasound delivery and acoustic field mapping in tissue phantoms
- • Underwater Communication: Wide radiation angle eliminates need for beam steering in point-to-multipoint acoustic data transmission systems
- • Acoustic Metamaterial Research: Hollow spheres serve as building blocks for phononic crystals and acoustic cloaking structures
Need custom hollow sphere or ball-shaped piezoelectric elements? We manufacture spherical shell PZT transducers and hollow ball piezo ceramics from 3mm to 80mm diameter with custom wall thickness (0.3-8mm), frequencies, and opening configurations. Matched pairs and arrays available for phased array applications.
Hollow Sphere & Ball-Shaped Piezoelectric Element Technical Specifications
Complete electromechanical parameters for spherical shell piezoelectric transducers and hollow ball piezo ceramics. Capacitance values for three standard PZT material formulations (P-33, P-52, P-81).
Spherical Shell Geometry Precision
Specialized molding and machining processes produce true spherical shells and ball-shaped ceramics with wall thickness uniformity ±0.05mm and concentricity ±0.1mm. Opening diameter precisely controlled for mounting and wire access without compromising acoustic performance.
Material Formulations
Three standard PZT compositions available: P-33 (soft PZT-5H type, high sensitivity), P-52 (medium properties), and P-81 (hard PZT-8 type, high power). Custom formulations for temperature stability or specific coupling requirements.
Underwater-Rated Construction
Hollow ball piezo elements can be supplied with polyurethane or silicone encapsulation for pressure compensation in deep-water applications. Hydrostatic testing to 300m depth available. Corrosion-resistant electrode materials for saltwater environments.
Matched Sets & Arrays
For hydrophone arrays and phased array systems, we provide frequency-matched and sensitivity-matched ball-type transducer sets with ±1% tolerance. Pre-wired assemblies with integrated preamplifiers available for turnkey integration.
Ball-Shaped & Spherical Shell Terminology
Our hollow sphere piezoelectric elements are also known as ball-shaped transducers, piezoelectric balls, or spherical shell elements. Whether you're searching for hollow ball piezo ceramics, ball type ultrasonic elements, or ceramic ball transducers, our product line covers all these equivalent specifications with the same high-precision manufacturing standards.
Understanding Hollow Sphere (Ball-Type) Piezoelectric Operation
Unlike flat disc or ring piezoelectric elements that vibrate primarily in thickness or radial modes, hollow sphere and ball-shaped transducers operate in a spherical breathing mode where the entire spherical shell expands and contracts radially. This produces a monopole radiation pattern with uniform intensity in all directions.
The radial electromechanical coupling coefficient (Kr) of 0.4 indicates efficient conversion between electrical and mechanical energy in this spherical expansion mode. Resonant frequency is determined by wall thickness and hollow ball diameter, with the relationship: f ≈ v / (2πr) where v is sound velocity in the ceramic (∼4000 m/s).
The multiple capacitance options (P-33, P-52, P-81) represent different PZT material formulations offering trade-offs between sensitivity, power handling, temperature stability, and aging characteristics. P-33 provides highest charge coefficient for ball-type receiver applications, while P-81 offers superior stability for high-power spherical shell transmitters.