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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Bolorforosh, M.S.S. Turner, C.W. |
| Copyright Year | 1989 |
| Description | Author affiliation: Dept. of Electron. & Electr. Eng., King's Coll. London, UK (Bolorforosh, M.S.S.; Turner, C.W.) |
| Abstract | A report is presented on recent advances in the performance of the optically scanned hydrophone (OSH). The OSH achieves quasi-real-time images of ultrashort acoustic pulses in water, typically across an aperture 10/sup 3/ lambda /sup 2/ in area. Accurate temporal waveforms of acoustic pulses with a center frequency around 20 MHz and pulse length as short as 50 ns can be achieved. The measured performance of the OSH is compared with that of the spot-poled hydrophone and interferometric systems for recording very short acoustic pulses in water. It is shown that the OSH offers a better overall performance which can be further extended by improvements to the design of the piezoelectric-semiconductor sandwich. The main factor limiting the spatial resolution and the sensitivity of the OSH is the finite thickness of the silicon photoconductive layer. By incorporating a novel silicon structure, the range of operation of the OSH can be extended above 30 MHz, providing a powerful diagnostic and calibrating tool for medical ultrasound transducers using very-wideband acoustic pulses. |
| Starting Page | 1067 |
| Ending Page | 1072 |
| File Size | 503423 |
| Page Count | 6 |
| File Format | |
| DOI | 10.1109/ULTSYM.1989.67153 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1989-10-03 |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Wideband Sonar equipment Acoustic pulses Biomedical optical imaging Optical interferometry Optical sensors Silicon Apertures Frequency Optical pulses |
| Content Type | Text |
| Resource Type | Article |
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