Measurement of the echo reduction for passive materials based on inverse filtering technique

Li, Suxuan; Li, Jianlong; Fu, Xiao

doi:10.1109/oceansap.2016.7485591

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The inverse-filter method has been widely used in various fields, more details of which are explained in Refs. (13)(14)(15)(16)(17)(18)(19), and here it is applied in underwater acoustical measurements, to be more precise, to measuring the reflection coefficient for a double-layered scaled model. The principle is briefly introduced to make this paper self-contained.…”

Section: Ift Methods and The Double-layered Scaledmodel 21 Principle mentioning

confidence: 99%

Measurement of reflection coefficient for a double-layered scaled model using the inverse filter

Song¹,

Yan²,

et al. 2021

MATEC Web Conf.

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A method of measuring the reflection coefficient for a double-layered scaled model using the inverse filter is presented. First, the response of the circuit and underwater acoustical channel is measured, and the retransmitted inverse signal isestimated with the least square method for solving the cost function, which is constructed by the inverse filtering theory. Then, by retransmitting the inverse signal, the incident signal at the position of the double-layered scaled model is focused with high-main-lobe resolution, low side-lobelevel and a narrow pulse signal in temporal domain. The focus improves the measurement accuracy of the reflection coefficient for the double-layered scaled model in low frequencies. The feasibility of replacing the whole cylindrical with the double-layered scaled model is verified by simulation. The validity of the proposed method is verified by experiments carried out in a cylindrical tank for a double-layered scaled model at the frequency 0.5 kHz~10 kHz. The experimental results show that the proposed method is effective to the measurement of the reflection coefficient for the double-layered scaled model.The experimental results for the double-layered scaled model with acoustical coating on different shells have strongly directive significance for the process design and improvement of the acoustical coating.

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Section: Ift Methods and The Double-layered Scaledmodel 21 Principle mentioning

confidence: 99%

Measurement of reflection coefficient for a double-layered scaled model using the inverse filter

Song¹,

Yan²,

et al. 2021

MATEC Web Conf.

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show abstract

“…element, i.e., only one projecting transducer is employed, the MIF is simplified as the single-channel inverse filter. 9,10 From the view point of the array shading, 15 the MIF may be regarded as a form of using this technique to improve the directional response and the signal waveform by optimizing the objective function in Eq. (3).…”

Section: Methods Of the Multichannel Inverse Filtering Techniquementioning

confidence: 99%

“…1 Many methods were proposed to measure the acoustic properties for either a small sample or a large sample. [2][3][4][5][6][7][8][9][10][11][12] There are many methods of measuring acoustic properties for a small sample in a sound tube. [2][3][4][5][6] However, measurements for small samples cannot fully reflect the overall acoustic performance for samples with complex structures.…”

Section: Introductionmentioning

confidence: 99%

Measurement of acoustic properties for passive-material samples using multichannel inverse filter

et al. 2017

The Journal of the Acoustical Society of America

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The measurement of acoustic properties for passive-material samples is strongly interfered by reverberations in a limited space. A multichannel inverse filter (MIF) can achieve spatio-temporal focusing by retransmitting the optimal signal estimated from multichannel impulse responses of the transmitter channel and the underwater acoustic channel. To decrease the influence of reverberations on measurements and improve the measurement precision, a MIF is employed to measure the echo reduction and insertion loss, respectively. The method is demonstrated by simulations and experiments, which were performed in a cylindrical tank to measure the two acoustic parameters for a steel plate sample.

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Theoretical and experimental calculation of underwater acoustic insertion loss of monolithic panels

et al. 2021

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Measurement of the echo reduction for passive materials based on inverse filtering technique

Cited by 4 publications

References 7 publications

Measurement of reflection coefficient for a double-layered scaled model using the inverse filter

Measurement of reflection coefficient for a double-layered scaled model using the inverse filter

Measurement of acoustic properties for passive-material samples using multichannel inverse filter

Theoretical and experimental calculation of underwater acoustic insertion loss of monolithic panels

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