Abstract
Detection of acoustic signals is an effective approach for online-monitoring of the power equipment. However, the signal-to-noise ratio 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 signal-to-noise ratio 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 as a technological platform for the acoustic fault diagnosis of power equipment.
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