Click and chirp signals with identical amplitude spectra have equal behavioural hearing thresholds for
audiometric routine. This might simplify calibration procedures. -
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By the free-field reciprocity calibration of quarter-inch measuring
microphones, the basis for the realization of the sound pressure unit
has been created for frequencies up to 160 kHz. and the comparison of
extended hydrophone calibration techniques -
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Membrane hydrophones developed and manufactured at PTB allow extremely
broadband acoustic pressure measurements and the comparison of extended
hydrophone calibration techniques -
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A fibre-optic technique was applied to measure the sound field in an ultrasonic cleaning vessel under practical conditions. -
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On November 17 and 18, 2005 the workshop "Cavitation: Description,
quantification and standardization for practical applications" was
realized under the - surely somewhat provoking - motto "Everybody uses
cavitation, but nobody really understands it". On two days, 40
participants (see photo) from universities, research institutes and
manufacturers throughout Germany intensively discussed the fundamentals
and applications of this complicated and complex process. -
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The recording of spectral sound field parameters directly in the
cleaning bath allows the efficiency of ultrasound-based cleaning
processes to be determined and optimized. -
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A new set-up allows the automatisation of tests for the type approval and the calibration of sound calibrators. -
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A portable power standard for the traceability of measuring devices for
ultrasonic physiotherapy equipment has successfully been developed and
tested in an international cooperation under EU funding. -
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