Ultrasonics without a Source: Thermal Fluctuation Correlations at MHz Frequencies

by: RL Weaver, OI Lobkis

Physical Review Letters, Vol. 87, No. 13. (September 2001), 134301.

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Abstract

Noise generated in an ultrasonic receiver circuit consisting of transducer and amplifier is usually ignored, or treated as a nuisance. Here it is argued that acoustic thermal fluctuations, with displacement amplitudes of 3 fm, contain substantial ultrasonic information. It is shown that the noise autocorrelation function is the waveform that would be obtained in a direct pulse/echo measurement. That thesis is demonstrated in experiments in which direct measurements are compared to correlation functions. The thermal nature of the elastodynamic noise that generates these correlations is confirmed by an absolute measurement of their strength, essentially a measurement of the sample temperature.

@article{citeulike:1006270, abstract = {Noise generated in an ultrasonic receiver circuit consisting of transducer and amplifier is usually ignored, or treated as a nuisance. Here it is argued that acoustic thermal fluctuations, with displacement amplitudes of 3 fm, contain substantial ultrasonic information. It is shown that the noise autocorrelation function is the waveform that would be obtained in a direct pulse/echo measurement. That thesis is demonstrated in experiments in which direct measurements are compared to correlation functions. The thermal nature of the elastodynamic noise that generates these correlations is confirmed by an absolute measurement of their strength, essentially a measurement of the sample temperature.}, author = {Weaver, R. L. and Lobkis, O. I. }, citeulike-article-id = {1006270}, doi = {http://dx.doi.org/10.1103/PhysRevLett.87.134301}, journal = {Physical Review Letters}, keywords = {anisotropy}, month = {September}, number = {13}, pages = {134301+}, posted-at = {2006-12-21 23:07:43}, priority = {2}, title = {Ultrasonics without a Source: Thermal Fluctuation Correlations at MHz Frequencies}, url = {http://dx.doi.org/10.1103/PhysRevLett.87.134301}, volume = {87}, year = {2001} }

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TY - JOUR ID - citeulike:1006270 L3 - citeulike-article-id:1006270 TI - Ultrasonics without a Source: Thermal Fluctuation Correlations at MHz Frequencies JF - Physical Review Letters VL - 87 IS - 13 SP - 134301 N2 - Noise generated in an ultrasonic receiver circuit consisting of transducer and amplifier is usually ignored, or treated as a nuisance. Here it is argued that acoustic thermal fluctuations, with displacement amplitudes of 3 fm, contain substantial ultrasonic information. It is shown that the noise autocorrelation function is the waveform that would be obtained in a direct pulse/echo measurement. That thesis is demonstrated in experiments in which direct measurements are compared to correlation functions. The thermal nature of the elastodynamic noise that generates these correlations is confirmed by an absolute measurement of their strength, essentially a measurement of the sample temperature. KW - anisotropy AU - Weaver, RL AU - Lobkis, OI PY - 2001/September// UR - http://dx.doi.org/10.1103/PhysRevLett.87.134301 ER -

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