Self-oscillation acoustic system destined to measurement of stresses in mass rocks

TL;DR

This paper introduces an electronic self-oscillation acoustic system designed to measure stress variations in mass rocks by detecting changes in acoustic wave velocity through frequency shifts.

Contribution

The paper presents a novel self-oscillation acoustic system utilizing piezoelectric components to measure stress-induced frequency variations in elastic media, applicable to mining conditions.

Findings

Laboratory tests confirmed frequency variations correlate with stress changes.

The system effectively detects stress variations in elastic media.

Parameters for optimal system operation were established.

Abstract

The paper presents an electronic self-oscillation acoustic system (SAS) destined to measure of stresses variations in the elastic media. The system consists of piezoelectric detector, amplifier-limiter, pass-band filter, piezoelectric exciter and the frequency meter. The mass rock plays a role of delaying element, in which variations in stresses causing the variations of acoustic wave velocity of propagation, and successive variation in frequency of oscillations generated by system. The laboratory test permitted to estimate variations in frequency caused by variations in stresses of elastic medium. The principles of selection of frequency and other parameters of the electronic system in application to stresses measurement in condition of the mine were presented.