Measuring method and apparatus for non-linear parameter of acoustic medium and its application
US4566460A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1984 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Mar 8, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0421
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring method and apparatus for measuring a non-linear parameter of an acoustic medium or its distribution, and the application of the parameter to the measurement of internal temperature of a sample noninvasively. A continuous wave ultrasonic probing beam is radiated through the sample, and a pumping wave which is an ultrasonic pulse is superposed on the probing beam. A phase change in the probing beam caused by the pumping wave is detected. From this phase change the non-linear parameter (B/A) is obtained. The invention projects two methods. The first method provides the pumping wave in a direction intersecting the probing beam. The second method projects the pumping wave in a direction along the probing beam in counter direction. From the information concerning the variation of measured value of (B/A), the inner temperature of the sample is obtained. The invention makes it possible to measure the non-linear parameter or temperature which was impossible in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.