Ultrasonic non-linear parameter measuring system
US4610255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1984 |
| Grant date | Sep 9, 1986 |
| Priority date | — |
| Expiry date | Nov 28, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8952
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to a system for measuring the non-linear parameter B/A of an ultrasonic medium such as a living tissue, namely the value which indicates a rate of change of the sound velocity with change of pressure, utilizing reflected ultrasonic waves. In this invention, a measuring burst pulse, having a comparatively high frequency, and a pumping pulse, having a comparatively low frequency and a high sound pressure, for giving a change of pressure are transmitted in the same direction while they are superposed, the phase of the reflected waves from each region of the ultrasonic medium is detected as a function of time, and it is then differentiated. Thereby, the distribution of B/A along the transmitting direction of said pulses can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.