Three-microphone probe bias errors for acoustic intensity and specific acoustic impedance

Lawrence, Joseph S.; Whiting, Eric B.; Gee, Kent L.; Rasband, Reese D.; Neilsen, Tracianne B.; Sommerfeldt, Scott D.

doi:10.1121/1.5022688

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…(13), the formulas for calculating the orthogonal components of the intensity bias, Ix and Iŷ , can be found in Table V in the Appendix (which also includes other probe configurations, discussed further on). The total bias errors are then given by L ;I ¼ 10 log 10 ffiffiffiffiffiffiffiffiffiffiffiffiffi ffi…”

Section: Bias Errors Caused By Uncorrelated Contaminating Noisementioning

confidence: 99%

“…Previous work has shown how different bias errors are obtained for various probe geometries for both methods using either a plane-wave source or a monopole source. [8][9][10] These previous studies are now expanded to investigate the effects contaminating noise and probe rotation have on the bias errors. The effects of both correlated and uncorrelated contaminating noise are investigated for single probe geometry, followed by a summary of the effects of using different probe geometries.…”

Section: Introductionmentioning

confidence: 99%

“…The two processing methods calculate the pressure gradient differently, which leads to different bias errors. For probe configurations where the intensity is calculated in two dimensions, the bias errors-the difference between the analytical intensity, I, and the calculated intensity, I calc -consist of a magnitude error and an angular error, defined, respectively, as L ;I ¼ 10 log 10 jI calc j jIj dB;…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effects of contaminating noise on the calculation of active acoustic intensity for pressure gradient methods

Cook

Gee

Neilsen

et al. 2019

The Journal of the Acoustical Society of America

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Bias errors for two-dimensional active acoustic intensity using multi-microphone probes have been previously calculated for both the traditional cross-spectral and the Phase and Amplitude Gradient Estimator (PAGE) methods [Whiting, Lawrence, Gee, Neilsen, and Sommerfeldt, J. Acoust. Soc. Am. 142, 2208-2218 (2017)]. Here, these calculations are expanded to include errors due to contaminating noise, as well as probe orientation. The noise can either be uncorrelated at each microphone location or self-correlated; the self-correlated noise is modeled as a plane-wave with a varying angle of incidence. The intensity errors in both magnitude and direction are dependent on the signal-to-noise ratio (SNR), frequency, source properties, incidence angles, probe configuration, and processing method. The PAGE method is generally found to give more accurate results, especially in direction; however, uncorrelated noise with a low SNR (below 10-15 dB) and low frequency (wavelengths more than 1/4 the microphone spacing) can yield larger errors in magnitude than the traditional method-though a correction for this is possible. Additionally, contaminating noise does not necessarily impact the possibility of using the PAGE method for broadband signals beyond a probe's spatial Nyquist frequency. V

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Section: Bias Errors Caused By Uncorrelated Contaminating Noisementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of contaminating noise on the calculation of active acoustic intensity for pressure gradient methods

Cook

Gee

Neilsen

et al. 2019

The Journal of the Acoustical Society of America

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An arbitrarily curved acoustic metasurface for three-dimensional reflected wave-front modulation

Wang

Chen

et al. 2020

J. Phys. D: Appl. Phys.

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Acoustic metasurfaces are attractive due to the feasibility of unprecedented modulation for reflected or refracted waves. However, most proposed acoustic metasurfaces are planar, which limits the application of metasurfaces. An acoustic metasurface with a curved surface shape is rarely reported, especially for the three-dimensional case. In this paper, the three-dimensional generalized Snell’s law for reflection at an arbitrarily curved surface is derived. Then tunable curved metasurfaces composed of the corrugated holes unit-cells are designed. And anomalous reflection, focusing and ground illusion are numerically demonstrated. The design methodology proposed in this paper expands the application range of acoustic metasurfaces and paves the way to some special application realms, such as wearable acoustic devices and acoustic devices with curved surfaces.

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Plane-wave tube validation of bandwidth extension for energy-based quantities using pressure gradient methods

Hawks¹,

Neilsen²,

Gee³

et al. 2017

Proceedings of Meetings on Acoustics

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Three-microphone probe bias errors for acoustic intensity and specific acoustic impedance

Cited by 3 publications

References 12 publications

The effects of contaminating noise on the calculation of active acoustic intensity for pressure gradient methods

The effects of contaminating noise on the calculation of active acoustic intensity for pressure gradient methods

An arbitrarily curved acoustic metasurface for three-dimensional reflected wave-front modulation

Plane-wave tube validation of bandwidth extension for energy-based quantities using pressure gradient methods

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