BS EN ISO 10534-2:2023

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Acoustics. Determination of acoustic properties in impedance tubes – Two-microphone technique for normal sound absorption coefficient and normal surface impedance

Published By	Publication Date	Number of Pages
BSI	2023	40

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Categories: 17.140.01 - Acoustic measurements and noise abatement in general, BSI

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PDF Pages	PDF Title
2	undefined
4	European foreword Endorsement notice
6	Foreword
7	1 Scope 2 Normative references 3 Terms, definitions and symbols
11	4 Principle 5 Test equipment 5.1 Construction of the impedance tube
12	5.2 Working frequency range
13	5.3 Length of the impedance tube 5.4 Microphones 5.5 Positions of the microphones
14	5.6 Acoustic centre of the microphone 5.7 Test sample holder
15	5.8 Signal processing equipment 5.9 Loudspeaker 5.10 Signal generator 5.11 Thermometer, barometer and relative humidity
16	6 Preliminary test and measurements
17	7 Test specimen mounting
18	8 Test procedure 8.1 Specification of the reference plane 8.2 Determination of the sound velocity, wavelength and characteristic impedance
19	8.3 Selection of the signal amplitude 8.4 Selection of the number of averages 8.5 Correction for microphone mismatch 8.5.1 General 8.5.2 Measurement repeated with the channels interchanged
20	8.5.3 Predetermined calibration factor
21	8.6 Determination of the transfer function between the two locations 8.6.1 General 8.6.2 Cross- and autospectra-based estimate
23	8.6.3 Frequency-domain deconvolution 8.6.4 Impulse-response based estimate
24	8.7 Determination of the reflection coefficient 8.8 Determination of the sound absorption coefficient 8.9 Determination of the specific acoustic impedance ratio 8.10 Determination of the specific acoustic admittance ratio
25	9 Precision 10 Test report
28	Annex A (normative) Preliminary measurements
30	Annex B (normative) Procedure for the one-microphone technique
31	Annex C (informative) Theoretical background
33	Annex D (informative) Error sources
35	Annex E (informative) Estimation of diffuse sound absorption coefficient of locally reacting absorbers from the results of this document
36	Annex F (informative) Estimation of intrinsic properties
38	Bibliography

Additional information

Status	Definitive
Pages	40
Publication Date	2023-10-11
ISBN	978 0 539 15537 2
Standard Number	BS EN ISO 10534-2:2023
Title	Acoustics. Determination of acoustic properties in impedance tubes – Two-microphone technique for normal sound absorption coefficient and normal surface impedance
Identical National Standard Of	EN ISO 10534-2, ISO 10534-2
Replaces	BS EN ISO 10534-2:2001
Descriptors	Equations, Construction materials, Precision, Test equipment, Sound insulation, Transfer functions, Acoustic absorption, Acoustic engineering, Frequencies, Test specimens, Calibration, Testing conditions, Acoustic properties and phenomena, Reflection factor, Buildings, Seatings, Error correction, Acoustic measurement, Mathematical calculations, Errors, Acoustic testing, Sound velocity, Acoustics, Reports, Ratios, Wavelengths
Publisher	BSI
Committee	EH/1/6
ICS Codes	17.140.01 - Acoustic measurements and noise abatement in general

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BS EN ISO 10534-2:2023

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