New sound intensity probe SIS 194 3D 1/2” and SIS 194 3D 1/4”
Microtech Gefell: The sound intensity probe SIS 194 3D allows a simultaneous sound intensity measurement at one point of a room in all three dimensions. For this purpose an arrangement of three one-dimensional sound intensity probes is formed, thus all three axes of the microphone pairs cross in one point and are in a plane perpendicular in each case. Each of those microphone pairs constitutes a one-dimensional sound intensity probe in conventional design.
In addition to measurement of sound pressure, each individual sound intensity probe -by its two-microphone-technology - enables the acquisition of the sound pressure gradient and thus the sound intensity computation. The probe consists of two in phase- and frequency response matched measurement-microphone capsules MK 222 E (order drawing MK 290 E) and MK 301 E (order drawing MK 390 E). By the use of the constant current powered 1/4 ‘’ measurement-preamplifier MV 310 the sound field distortions (shading and diffraction) are minimal. The distance between the three microphone capsules is accurately defined by means of a spacer. Thereby measurements are possible in a frequency range from 35 Hz to 10 kHz.
The quality of conformity of both measurement capsules, relating to their transfer function, is measured in accordance with DIN EN 61043 and IEC 1043 respectively and documented as pressure-intensity-distance/residual-intensity-distance for probes. To each measurement-capsule pair of the SIS 194 3D a measurement report is enclosed. On the basis of this report the compliance with tolerance limits for class 1. probes is apparent.