System for monitoring infrasonic and low-frequency sound fields

Purpose

The development of a new system for monitoring infrasonic and low-frequency sound fields with the localization of the sources of radiation levels that have adverse effect upon human health. The system is intended for environmental monitoring of the air medium, both indoors and outdoors.

System components and the degree of readiness

A prototype of the monitoring system is developed and manufactured. It consists of a receiving array and Prototype of the system for monitoring infrasonic and low-frequency sound fields a software-hardware system of data processing. The array contains three pairs of spatially distributed microphones that allow one to measure the parameters of an acoustic field with the localization of the sources of radiation. The microphones of the array can be set at distances 0.03 to 1.2 m from each other, so that they can cover the measuring frequency range from 2 to 2000 Hz. A software package is developed for the signal processing and for displaying the results of measurements on the screen. The temporal, spectral, and correlation characteristics of the received signals are determined along with the sound intensity level and the direction toward the source of radiation. Using the designed prototype of the system, measurements of infrasonic and low-frequency sound fields were performed for a sound radiation with a level up to 120 dB and frequencies 2 Hz and above. The test measurements confirmed that the system provides sound field measurements with high accuracy.

The Acoustics Institute is ready to perform the orders for monitoring infrasonic fields both indoors and outdoors with the localization of the sources of radiation.