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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Newhouse, V.L. Reid, J.M. |
| Copyright Year | 1990 |
| Description | Author affiliation: Drexel Univ., Philadelphia, PA, USA (Newhouse, V.L.; Reid, J.M.) |
| Abstract | It is known that if single-frequency, continuous-wave ultrasound or electromagnetic energy is reflected from straight line flow, defined here as one or more scatterers moving with constant velocity along an infinite straight line, the Doppler effect will shift the echo spectrum center frequency from the transmitted value, and broaden its bandwidth. It is shown here that if such straight line flow is shifted anywhere in the field without change of orientation, the absolute echo bandwidth remains unchanged. This result is unexpected, since the bandwidth arises from amplitude modulation of the echo from the scatterers as they pass through the incident field, and the shape of this field varies with position. The Doppler bandwidth may therefore be used to estimate the transverse component of the flow velocity anywhere in the sound beam. The effect of the system relative aperture on the minimum spectral broadening and maximum frequency indication may also be assessed at any range. |
| Starting Page | 1533 |
| Ending Page | 1536 |
| File Size | 335101 |
| Page Count | 4 |
| File Format | |
| DOI | 10.1109/ULTSYM.1990.171623 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1990-12-04 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Bandwidth Electromagnetic scattering Acoustic scattering Ultrasonic imaging Apertures Ultrasonic transducers Frequency estimation Fourier transforms Biomedical engineering Doppler effect |
| Content Type | Text |
| Resource Type | Article |
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