Thermoacoustic transducer and methods for resonant generation and amplification of sound emission
US10582310B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 14, 2017 |
| Grant date | Mar 3, 2020 |
| Priority date | — |
| Expiry date | Sep 15, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2307/023
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transducer includes an acoustic reflector, an acoustic coupler and one or more thermoacoustic frames. The acoustic coupler is disposed proximate to an output of the transducer and each of the thermoacoustic frames is disposed between the acoustic reflector and the acoustic coupler. The thermoacoustic frames, the acoustic reflector and the acoustic coupler form a resonator with each of the thermoacoustic frames configured to emit a broadband acoustic signal in response to receiving electrical energy. Additionally, the resonator is configured to emit a narrowband acoustic signal at the transducer output in response to receiving the broadband acoustic signal. A method includes adjusting a frequency of the narrowband acoustic signal by controlling a spacing between the thermoacoustic frames and one or more components of the resonator. Thermoacoustic device embodiments capable of resonant emission of intense ultrasound radiation generated by sheets of multi-walled carbon nanotubes (MWNT) are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.