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Topic: Absorption coefficient

	Acoustics :: View topic - Measuring Sabine Absorption values
		Using a reverberation chamber, the sound absorption is computed as the difference of the Sabine absorption with and without the object under test present in the reverberation chamber.
		The apparent boost in sound absorption coefficient that comes about due to wave diffraction at the edges of the specimen.
		The specimen appears to be larger than its plan area by a perimeter stripe with width proportional to lambda, where aS is the sound absorption coefficient that would result from testing an infinite area.
	forum.studiotips.com /viewtopic.php?p=16657 (305 words)

	Green Building Encyclopedia - Glossary of Green Building Terms
		Average of the sound absorption coefficient of the four octave bands 250, 500, 1,000, and 2,000 Hertz rounded to the nearest 0.05.
		It is a function of room volume and amount of sound absorption provided by surface finishes in the room.
		The ratio of transmitted flux to incident flux; measured by a transmissometer.
	www.whygreenbuildings.com /glossary.php (6282 words)

	Encyclopedia of Laser Physics and Technology - Two-photon absorption, TPA
		Two-photon absorption is a process where two photons are absorbed simultaneously, exciting e.g.
		This is a nonlinear process, occurring with significant rates only at high optical intensities, because the two-photon absorption coefficient is proportional to the optical intensity:
		An examples is two-photon absorption in semiconductors, where a single photon energy would be below the bandgap energy, but an excitation from the valence band to the conduction band is possible.
	www.rp-photonics.com /two_photon_absorption.html (184 words)

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