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For improvement of detection of a buried object in shallow water, a robust time reversal detection approach is proposed. Time reversal processing (TRP) is commonly applied for signal enhancement in a homogenous medium. In this paper, time reversal focusing in non-homogenous media is theoretically analyzed based on a wave propagation equation. From the perspective of beamforming, TRP is equivalent...
Phononic crystal (PnC) resonators of Bloch-mode resonance made by replacing periodically arranged two or three rows of air holes with one row of air holes on a two-dimensional (2-D) silicon slab with air holes of square lattice have been investigated. Piezoelectric aluminum nitride (AlN) film is employed as the interdigital transducers to transmit and detect acoustic waves, thus making the whole microfabrication...
Correctly estimated the number of partial discharge (PD) source is the premise of the power transformer PD location based on ultrasonic array sensors. Therefore, estimation of the number of power transformer PD source is a very necessary research work. In this paper, we proposed the modified canonical correlation technique (CCT) to estimate the number of transformer PD source. The simulation experiment...
Due to the heavy calculation and low estimation precision with little signal-to-noise (SNR) of MUSIC (multiple signal classification) algorithm in partial discharge location used ultrasonic phased array, in this paper, a new location method is proposed based on root-multiple signal classification (Root-MUSIC). Firstly, Root-MUSIC algorithm is used for direction of arrival estimating of PD source....
The precise PD locating in power transformer can provide scientific information and guidance for its state maintenance. Due to the low resolution and estimation precision of MUSIC algorithm in PD locating used ultrasonic phased array, in this paper, a new locating method is proposed based on modified multiple signal classification (MMUSIC). Firstly, MMUSIC algorithm is used for direction of arrival...
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