Acoustic Measurements definition of Acoustic Measurements in the Free Online Encyclopedia.

Acoustic Measurements

measurements of the values that describe sounds and noises in terms of their intensities and various qualitative features (such as their spectra or the growth and decay of the sound over time). The principal values measured in acoustics are sound pressure, sound intensity, vibration velocity and particle displacement, the frequency and period of vibrations, propagation velocity, damping factor, and others. The most important characteristic is sound pressure, because the human ear responds to the sound wave pressure.

Acoustic measurements are closely linked with electrical measurements and are performed chiefly with electronic measuring instruments. The difficulties experienced in acoustic measurements are due to the complicated spatial distribution of the acoustic values in rooms as well as the variability of sounds and noises over time.

For sound pressure measurements a standard microphone is used in air or a hydrophone in water. The receiving portion of these instruments transforms the received acoustic signals (pressures) into proportional electric voltages, which are then fed to the input of amplifiers with indicators for readout. A sound-level meter is used for measuring various noises.

An important part of acoustic measurements is building and architectural acoustics—the measurements of the sound isolation of partitions and coverings and of the sound absorption factor of different structural coverings (such as plaster, upholstery, and floors).

There are other kinds of acoustic measurements such as measurements of waveguide characteristics, tests of acoustic instruments for communication and broadcasting (that is, of acoustic transmitters and receivers), tests of tape recorders and record players, and of telephone communication. Of special importance is the category of subjective measurements of the hearing sensitivity of people and its deviations from the norm (audiometry).

REFERENCES

Beranek, L. Akusticheskie izmereniia. Moscow, 1952. (Translated from English.)
Kliukin, I. I., and A. E. Kolesnikov. Akusticheskie izmereniia v sudostroenii, 2nd ed. Leningrad, 1968.

I. G. RUSAKOV

Mentioned in	?		References in periodicals archive	?		Encyclopedia browser	?		Full browser	?
No references found	SPY, BD and PP data were then sorted based on either Fakopp or Director velocity and divided into four even-size classes based on the acoustic measurements. Predicting pulp yield and pulp productivity of Eucalyptus dunnii ... by Raymond, C.A.; Thomas, D.S.; Henson, M. / Australian Forestry Objectives included ensuring the final shuttle motors were built with the level of quality required to safely put astronauts into space, demonstrating performance of minor upgrades to materials, and testing acoustic measurements around the aft end of the motor that will provide valuable data for the Ares program. ATK and NASA Perform Final Ground Test for Space Shuttle Program by PR Newswire Merlone, Acoustic measurements of the thermodynamic temperature between the triple point of mercury and 380 K, Metrologia 41, 74-98 (2004). Perturbations from ducts on the modes of acoustic thermometers by Gillis, K.A.; Lin, H.; Moldover, M.R. / Journal of Research of the National Institute of Standards and Technology	acoustic grating acoustic heat engine acoustic hologram acoustic homing acoustic horn acoustic image acoustic imaging Acoustic Impedance acoustic inertance acoustic insulation Acoustic Intensifier acoustic intensity acoustic interferometer acoustic jamming acoustic labyrinth Acoustic Lens acoustic levitation acoustic line acoustic line of position acoustic logging acoustic Mach meter acoustic mass acoustic mass reactance Acoustic Materials acoustic measurement Acoustic Measurements acoustic memory acoustic microscope acoustic mine acoustic mode acoustic navigation acoustic nerve acoustic noise acoustic ocean-current meter acoustic ohm acoustic particle detection acoustic phonon acoustic plaster acoustic position reference system Acoustic Power Acoustic Probe acoustic radar acoustic radiation Acoustic Radiation Pressure Acoustic Radiator Acoustic Radiometer acoustic ratio acoustic reactance acoustic reactance unit acoustic receiver acoustic reciprocity theorem	Acoustic Intercept System Acoustic Interference Monitor System Acoustic interferometer acoustic jamming acoustic jamming Acoustic Kung Fu Films acoustic labyrinth Acoustic Leak Detection acoustic lens Acoustic Lens Simulation Software Package Acoustic levitation acoustic line acoustic line of position Acoustic Link Control Software Acoustic Literature Map of Europe Acoustic Local Area Network acoustic logging acoustic Mach meter acoustic maculae acoustic maculae acoustic maculae acoustic maculae acoustic mass acoustic mass reactance Acoustic Materials acoustic measurement Acoustic Measurement Facilities Improvement Program Acoustic Measurement System Acoustic Measurements acoustic meatus acoustic meatus acoustic meatus acoustic meatus, meatus acusticus, meatus auditorius, auditory meatus acoustic meatus, meatus acusticus, meatus auditorius, auditory meatus acoustic meatus, meatus acusticus, meatus auditorius, auditory meatus acoustic memory Acoustic Meteorological Observing System acoustic microscope acoustic microscope acoustic microscope Acoustic Mid-Ocean Dynamics Experiment Acoustic mine Acoustic mine acoustic minehunting Acoustic Mismatch Model acoustic mode Acoustic Model Adaptation Acoustic Model Applications Project Acoustic Model Evaluation Committee acoustic modem Acoustic Monitoring of Ocean Circulation in the Arctic Acoustic music acoustic navigation acoustic nerve acoustic nerve acoustic nerve acoustic nerve Acoustic neurinoma Acoustic neurinoma

Mentioned in

References in periodicals archive

Encyclopedia browser

Full browser

No references found

SPY, BD and PP data were then sorted based on either Fakopp or Director velocity and divided into four even-size classes based on the acoustic measurements.

Predicting pulp yield and pulp productivity of Eucalyptus dunnii ... by Raymond, C.A.; Thomas, D.S.; Henson, M. / Australian Forestry

Objectives included ensuring the final shuttle motors were built with the level of quality required to safely put astronauts into space, demonstrating performance of minor upgrades to materials, and testing acoustic measurements around the aft end of the motor that will provide valuable data for the Ares program.

ATK and NASA Perform Final Ground Test for Space Shuttle Program by PR Newswire

Merlone, Acoustic measurements of the thermodynamic temperature between the triple point of mercury and 380 K, Metrologia 41, 74-98 (2004).

Perturbations from ducts on the modes of acoustic thermometers by Gillis, K.A.; Lin, H.; Moldover, M.R. / Journal of Research of the National Institute of Standards and Technology