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...f the acoustic energy at the [[nares]], A_n, to amplitude of the acoustic energy at the mouth, A_m. The term ''nasalance'' usually refers t ...e - Mask Based Nasometry}}</ref> in the manner in which the oral and nasal acoustic energies are separated physically, as by a hard separator plate held agains ...

...rally, the force exerted on the obstacle is evaluated by integrating the [[acoustic radiation pressure]] (due to the presence of the sonic wave) over its time- The magnitude of the force exerted by an acoustic plane wave at any given location can be calculated as: ...

...tin, S. J.; Ricco, A. J.; Zellers, E. T.; Frye, G. C.; Wohltjen, H. |title=Acoustic Wave Sensors.Theory, Design, and Physico-Chemical Applications|publisher=Ac ...e Acoustic Wave Sensor Interdigitated Transducer Diagram.png|thumb|Surface Acoustic Wave Sensor Interdigitated Transducer Diagram]] ...

...time taken by the ultrasound wave to return to the surface. This type of measurement is typically performed with an [[ultrasonic thickness gauge]]. ...undergo different phenomena like multipath reflection or diffraction. The measurement does not need to be affected by these since the first recorded return will ...

...ting''' is the testing of the mechanical resistance of a spacecraft to the acoustic pressures during launch. In the [[aerospace industry]], acoustic chambers are the main facilities for such tests. A chamber is a reverberant ...

...che Bundesanstalt|PTB]] in Germany, [[NIST]] in the USA and the [[National Measurement Institute, Australia]], where the reciprocity calibration (see below) is th ...example a pressure field and a free field. Depending on their application, measurement microphones must be tested periodically (every year or several months, typi ...

...and localized pressure change. This periodic pressure change generates an acoustic wave with a specific frequency. Among various factors that determine this f ...sity wave is induced. Otherwise, there is a frequency shift in the induced acoustic wave. The magnitude of the frequency shift depends on the relative velocit ...

...aging of macro-sized polysilicon grains on wafers using spatially resolved acoustic spectroscopy|journal=Scripta Materialia|language=en|volume=140|pages=67–70| ...measures the surface acoustic wave velocity across a specimen, the surface acoustic wave (SAW) velocity is in turn a function of the material state, including ...

...ww.thefoa.org}}</ref> Measures of TL are very important in the industry of acoustic devices such as [[muffler]]s and [[sonar]]s. Measurement of transmission loss can be in terms of [[decibels]]. ...

...media. The method provides a two-dimensional (2D) projection image of the acoustic beam in real-time ("live video"). ...lieren imaging is equivalent to an [[radiography|X-ray radiograph]] of the acoustic field.{{citation needed|date=May 2020}} ...

'''Transmission loss''' (TL) in duct [[acoustics]] describes the acoustic performances of a [[muffler]]-like system. It is frequently used in the ind ...the terminations. But measurement of the incident wave in a standing wave acoustic field requires uses of impedance tube technology, may be quite laborious, u ...

...regory|first2=E. H.|last3=Baily|first3=P. K.|date=1969-11-03|title=Nuclear Acoustic Resonance in Aluminum Via Coupling to the Magnetic Dipole Moment|journal=Ph ...ef>{{Cite journal|last=S.C. Ying|first=J.J. Quinn|date=6 August 1966|title=Acoustic Nuclear Spin Resonance in Metals|journal=Physics Letters|volume=23|issue=1| ...

...c camera (25fps) - pone.0048907.s003.ogv|thumb|A sound visualization of an acoustic camera that was catching sounds form two [[african elephants]].]] An '''acoustic camera''' (or '''noise camera''') is an [[imaging]] device used to locate s ...

...op.org/article/10.3847/2041-8213/ac5c5b Reiss et al. 2022. A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km s−1 Mpc−1 Uncertainty f ...24. DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations] </ref>). ...

==Measurement of Q== * [[Acoustic attenuation]] ...

...py]] that employs very high or [[ultra high frequency]] [[ultrasound]]. '''Acoustic microscopes''' operate non-destructively and penetrate most solid materials ...1907767|bibcode = 1959ASAJ...31..632D|issue=5 }}</ref> performed the first acoustic microscopy experiments, though not at very high frequencies. ...

...r diffraction methods|last=|first=|date=|website=|access-date=}}</ref> and acoustic spectroscopy ([[Coulter counter]]). ...

...|date=2012|title=Laboratory investigation of a passive acoustic method for measurement of underwater gas seep ebullition|journal=The Journal of the Acoustical Soc ...

...of biomedical imaging due to its scalability. By adjusting the optical and acoustic foci, lateral resolution may be optimized for the desired imaging depth.<re ...ducer]] allows one to focus ultrasound waves similar to passing through an acoustic lens. This delay-and-sum method enables one to find the signal at each foca ...

===Acoustic emission=== ...ibcode=2003Sci...299...89W | s2cid=22277137 }}</ref> The amplitudes of the acoustic signals can be related to the area swept by the fast-moving dislocations an ...