Single Chip Lenses for Ultrasonic Imaging
Abstract
During this program, the theoretical understanding of Cascade Charge Coupled Device (C3D) electronic lenses have been greatly extended. Specifically, the attenuation effects of transfer efficiency were found to be deterministic and insignificant, lateral resolution and sidelobe response were not to be serious limitations, while for moderate values of charge-transfer inefficiency, spatial shifting of beamsteering angle was found to be minor. In addition, a novel analysis of the device performance substantiated that aberations resulting from the intermodulation process would, in most practical cases, not limit system performance. Also during this program, the fabrication process for the device was optimized. This includes optimizing of the polysilicon electrode conduction and the channel length. An advanced lens incorporating the cumulative design rules resulting from this program has been fabricated. This device, a 32 channel, 10,000 charge-coupled element lens, will be used in 4.5 MHz imaging system to be developed under another program.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 29, 1979
- Accession Number
- ADA088857
Entities
People
- James D. Meindl
Organizations
- Stanford University