Uses and Features
Introduction
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.
Several sound intensity probe sets are available from Brüel & Kjær: Types 3583 and 3584 are for use with Brüel & Kjær analyzers e.g., Types 2144, 2133 and PULSE™ 3560 (see separate Product Data Sheet for Types 3583/3584). Sound Intensity Probe Set 3595 is intended for use with 2260 Investigator. (Fig. 1). 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, e.g., NEXUS™ Conditioning Amplifier Type 2691. The characteristics of the Sound Intensity Probe Kit Type 3595 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 the analyzers.
Probe Description
The sound intensity probe is constructed on a face-to-face design. It consists of a robust frame which holds the microphone preamplifier(s) and matched microphones in a face-to-face configuration. The distance between the microphones is defined by solid plastic spacers which are held in place by threaded...
For a full Description and Specifications, see Product Data
Products
