Uses
- Sound intensity measurements using two-microphone technique, in accordance with IEC 1043 Class 1
- Sound power measurements in accordance with ISO 9614 – 1, ISO 9614 – 2, ECMA 160 and ANSI S 12 – 12
- Sound intensity mapping
| Features
- Microphone pair matched for phase and amplitude response
- Individual calibration data
- 1/3-octave centre frequency ranges: – 20 Hz to 10 kHz with corrections – 50 Hz to 6.3 kHz according to IEC 1043 Class I
- Minimal shadow and diffraction effects
- Well-defined acoustical microphone separation
- Remote Control Unit which works together with the complete range of Brüel & Kjær analyzers
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Introduction
The measurement of sound intensity (sound power per unit area) is increasingly being used as a routine technique in a wide range of noise investigations. The method permits the determination of sound power from direct measurement of sound intensity, even in situations where pressure-based measurements would be impossible. Since the method does not require special acoustic environments such as reverberation and anechoic chambers, significant savings can also be made.
To measure sound intensity accurately using a two-microphone technique, you need a reliable sound intensity probe set containing a matched microphone pair to obtain information on both the instantaneous pressure and pressure gradient in the sound field. The microphones are separated by a fixed distance in the sound field, and the microphone signals are fed to a sound intensity processor which calculates the sound intensity. The sound intensity is calculated from the time average of the sound pressure multiplied by the particle velocity (calculated from the measured pressure gradient). Such a system measures the component of the sound intensity along the probe axis and also indicates the direction of energy flow.
Two sound intensity probe sets are available from Brüel & Kjær: Type 3599 (Fig. 1) for use with Brüel & Kjær analyzers for example, Types 2144, 2133 and PULSE™ 3560; and Type 3595 for use with 2260 Investigator™. The Dual Preamplifier Type 2683 with Microphone Pair Type 4197, Extension Stem UA 1439 and Handle with Integral Cable UA 1440 can also be used with other intensity systems, for example, NEXUS™ Conditioning Amplifier Type 2691. The characteristics of Sound Intensity Probe Kit Type 3599 and Sound Intensity Microphone Pair 4197 are described in this Product Data sheet.
For further details of the sound intensity analyzers and information on which probe set is suitable for which analyzer, see the separate Product Data sheets for...
For a full Description and Specifications, see Product Data
Products
