Measurement method and system utilizing ultrasonic wave
US4414850A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1981 |
| Grant date | Nov 15, 1983 |
| Priority date | — |
| Expiry date | Jun 3, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8952
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measurement method and system for measuring characteristics of attenuation of domains in an object comprises transmitting ultrasonic waves into the object and receiving ultrasonic waves reflected from the object. The measured characteristics of attenuation of reflected waves is determined using signal intensities. A plurality of ultrasonic waves having different frequencies are transmitted either simultaneously or alternately to an object, and the reflected waves are received from the object. The signal intensities corresponding to the transmission frequencies among the reflected waves are stored and the signal intensity ratio is calculated. The signal intensity ratio indicates the attenuation characteristic. The attenuation coefficient can also be obtained using a time interval from the transmission time to the time of the reflected wave is received. The attenuation slope can be obtained from this attenuation coefficient and the frequency difference between transmitted ultrasonic waves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.