35-MHz 64-Element 2-2 Composite Linear Array for Ophthalmic Imaging
This 64-element linear array operates at 35 MHz for high-resolution ophthalmic imaging. The array uses a 2-2 piezo-composite fabricated by mechanical dicing of bulk Navy Type VI PZT with 14 µm kerfs filled with Al₂O₃-loaded epoxy. Elements are spaced at 50 µm pitch (1.2λ) with 3 mm elevation aperture and cylindrical epoxy lens focused at 10 mm. A 75 Ω coaxial cable provides impedance matching to 50 Ω electronics. Measured bandwidth averages 55%, insertion loss is 22.8 dB, and crosstalk is < −24 dB. Synthetic aperture imaging of a wire phantom demonstrates 42 µm axial and 95 µm lateral resolution.
Parameter | Value |
|---|---|
Array Type | Linear array, 2–2 composite |
Number of Elements | 64 |
Center Frequency | 35.3 MHz |
Bandwidth (‑6 dB) | 55% |
Piezoelectric Material | Navy Type VI fine‑grain PZT |
Composite Thickness | 50 μm |
Element Pitch | 50 μm (1.2λ) |
Elevation Aperture | 3 mm |
Elevation Focus | 10 mm |
Insertion Loss | 22.8 dB |
Crosstalk (adjacent) | < −24 dB |
Axial Resolution | 42 μm |
Lateral Resolution | 95 μm |
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