Ultrasonic sensing
US4398424A · kind A · utility
14Cited by
9References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1980 |
| Grant date | Aug 16, 1983 |
| Priority date | — |
| Expiry date | Dec 16, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2634
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pulse-echo device with an improved signal-to-noise ratio, in which sound-transmitting material adjacent to the device is coated with a sound-absorbing layer, the layer being sound-impedance matched to the material so that much of the spurious ultrasonic energy travelling in the material passes through the layer-material interface into the layer where it dissipates instead of remaining in the material and reflecting back to the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.