FEATURES OF THE ACOUSTIC SIGNAL IN THE CONTINUOUS MONITORING OF DUST IN THE PRODUCTION OF BUILDING MATERIALS

Abstract

The article discusses methods for determining the dustiness of air in the production of building materials. The advantages and disadvantages of such methods as optical and radioisotope are noted. For continuous monitoring of the concentration of dust flow in ventilation systems, acoustic method is singled out as a promising. It's based on the analysis of the acoustic signal from the interaction of moving dust particles with the duct wall. The elements of this information chain, its features in the frequency domain and ways of extracting useful information by computer software processing are analyzed in detail. The features of an acoustic signal using the Fourier integral to obtain a continuous spectrum of a non-periodic process containing a random component are considered. The obtained Fourier spectra make it possible to compare the efficiency of various pulse forms, since they are important in the study of shock processes of dust particles with the duct wall. The use of the direct integral Fourier transform makes it possible to isolate the frequency spectrum consisting of the main and timbre harmonics. Taking into account the timbre harmonics of the spectrum makes it possible to obtain reliable information about the concentration of dust flow at enterprises producing construction materials.