A Portable Industrial Acoustic Detection System With Multiband Resonant Amplification

Detection of acoustic signals is an effective approach for online monitoring of power equipment. However, the signal-to-noise ratio (SNR) of the acoustic detection system is limited by the noisy and harsh environment around the power equipment. In this study, an acoustic detection system based on resonant-enhanced acquisition is proposed. By utilizing a horn-shaped acoustic resonator with multiple resonant frequencies, the proposed system can realize long-distance acoustic sensing with high sensitivity in both the audible and ultrasonic ranges. The sensitivity of the system in the designated frequencies is enhanced by 28 dB, while the SNR increased by 14.1 dB. Integrated with a control terminal, the system can perform complex functionality, e.g., record and analyze the acoustic information and provide visual/audible feedback for human operators. The proposed system can be considered a technological platform for the acoustic fault diagnosis of power equipment.