Instant curvature measurement for microcantilever sensors
A multiple-point deflection technique has been developed for the instant measurement of microcantilever curvature. Eight light-emitting diodes are focused on various positions of a gold-coated silicon...
A multiple-point deflection technique has been developed for the instant measurement of microcantilever curvature. Eight light-emitting diodes are focused on various positions of a gold-coated silicon...
Addendum: "Small-size sonic crystals with strong attenuation bands in the audible frequency range" [Appl. Phys. Lett. 84, 3364 (2004)]
Traveling-wave thermoacoustic electric generator
Appl. Phys. Lett. 85, 1085 (2004); doi:10.1063/1.1781739
Issue Date: 9 August 2004
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Traveling-wave thermoacoustic heat engines have been demonstrated to convert high-temperature heat to acoustic power with high efficiency without using moving parts. Electrodynamic linear alternators and compressors have demonstrated high acoustic-to-electric transduction efficiency as well as long maintenance-free lifetimes. By optimizing a small-scale traveling-wave thermoacoustic engine for use with an electrodynamic linear alternator, we have created a traveling-wave thermoacoustic electric generator; a power conversion system suitable for demanding applications such as electricity generation aboard spacecraft.
©2004 American Institute of Physics
| History: | Received 29 March 2004; accepted 15 June 2004 |
| Permalink: |
http://link.aip.org/link/?APPLAB/85/1085/1 |
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BibSonomy
KEYWORDS and PACS
electric generators,
heat engines,
thermoelectric conversion,
thermoacoustics,
electrodynamics,
linear machines,
space vehicle power plants,
alternators,
compressors
- 84.60.Rb
Thermoelectric, electrogasdynamic and other direct energy conversion excluding electrochemical, photoelectric, magnetohydrodynamic, and thermionic conversion - 07.20.Pe
Heat engines; heat pumps; heat pipes (thermal instruments) - 43.35.Ud
Thermoacoustics, high temperature acoustics, photoacoustic effect - YEAR: 2004
RELATED DATABASES
PUBLICATION DATA
0003-6951 (print)
1077-3118 (online)
AIP
REFERENCES (8)
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- C. F. Cheuk, N. G. Hill, R. Strauch, P. B. Bailey, and J. Raab, in Cryocoolers 12, edited by R. G. Ross (Plenum, New York, 2002), pp. 275–281.
- S. Backhaus and G. W. Swift,
Nature (London) 399, 335 (1999) . - J. J. Wollan, G. W. Swift, S. Backhaus, and D. L. Gardner, Proceedings of the American Institute of Chemical Engineers (AIChE, New York, 2002).
- E. Tward, M. Petach, and S. Backhaus, in Space Technology and Applications International Forum (AIP Press, New York, 2002), p. 656.
- W. C. Ward and G. W. Swift,
J. Acoust. Soc. Am. 95, 3671 (1994) ; - software and user's guide available either from the Los Alamos thermoacoustics website at www.lanl.gov/thermoacoustics/ or from the Energy Science and Technology Software Center, U.S. Department of Energy, Oak Ridge, Tenn.
- In practice, two power meters are used. Due to various nonlinear processes, helium is pumped through the gap between each piston and cylinder. This would force the pistons off center, however, a dc current is injected into the alternator coils to keep the pistons centered axially. One power meter measures the difference between the ac power generated by the alternator and the injected dc power. A second power meter measures the dc power. We report the sum of the two power meter measurements which is the ac power generated by the alternator.
