Development of a PVDF needle-type hydrophone for measuring ultrasonic fields

Boechat, Flavio M B; Rodrigues, Estevão Patricio; Oliveira, Timóteo Francisco de; Buiochi, Flávio

doi:10.1109/induscon.2018.8627232

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…The overall production process of the PVDF spherical transducer is shown in Figure 1. It mainly consists of PVDF film, a backing, and a matching layer [9]. The primary function of the backing layer is to provide a specific stiffness for the PVDF film and to drive the PVDF film to vibrate and generate electrical signals when sound signals are incident.…”

Section: Design Of Spherical Transducer Based On Pvdf Flexible Filmmentioning

confidence: 99%

Research on detection and localization of buoyancy material damage in manned submarine vehicles based on PVDF spherical transducers and wavelet threshold denoising

Yin,

Liu,

2024

Third International Conference on Testing Technology and Automation Engineering (TTAE 2023)

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A method for locating the damage in buoyancy materials of manned submersibles based on polyvinylidene fluoride (PVDF) spherical transducer is proposed to address the problem of difficulty in real-time monitoring and positioning the damaged buoyancy materials during manned submersible operations. A PVDF spherical transducer array based on the optimal quaternion matrix principle was designed to determine the precise location of the damaged buoyancy material in the damaged area. The sound source localization model was established using the time-delay difference method to obtain the exact coordinates of the fracture site of the buoyancy material. To extract effective sound signals from the fracturing of buoyancy materials, a wavelet threshold-based signal denoising method was designed. Based on the localization principle, a software and hardware system for buoyancy material damage location was intended, and the feasibility of the process was verified by constructing an experimental platform. The experimental results show that under a laboratory simulated deep-sea noise environment, the wavelet threshold-based sound signal denoising method can effectively extract the target signal of buoyancy material fracture, and the spherical transducer with the denoised sound signal can accurately locate the damage position.

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Section: Design Of Spherical Transducer Based On Pvdf Flexible Filmmentioning

confidence: 99%

Research on detection and localization of buoyancy material damage in manned submarine vehicles based on PVDF spherical transducers and wavelet threshold denoising

Yin,

Liu,

2024

Third International Conference on Testing Technology and Automation Engineering (TTAE 2023)

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“…The acoustic field from a 2D phased-array ultrasound transducer (Figure 2) was measured with the self-made needle hydrophone described in [5]. Because the hydrophone was not calibrated, the measurements were normalized by the maximum amplitude of the field.…”

Section: Acoustic Field Measurementmentioning

confidence: 99%

“…The needle hydrophone can be made of a piezoelectric polymer, polyvinylidene fluoride (PVDF), which has a very large sensitivity and bandwidth compared to ceramics [4,5]. In [6], a sensor for measuring acoustic waves from a high-intensity focused ultrasound (HIFU) transducer also used a PVDF polymer.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Three Linear Digital Filters Applied to Improve the Quality of the Measured Acoustic Field

Rodrigues,

Santos,

Buiochi

2023

Eng

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The measurement of acoustic fields generated by ultrasonic transducers is important for determining the focal length, lateral resolution, and amplitudes of the lateral and grating lobes. The acoustic field is commonly characterized by a set of scans using a needle hydrophone. The output of the hydrophone can be connected to an analog filter to enhance the signal. However, the analog filter might not be sufficient to avoid the noises that distort the signals. Alternatively, linear digital filters can be advantageous to improving the acoustic-field characterization. In this work, three filters were investigated: moving average (MA), band-pass Hamming window (HW), and band-pass Blackman window (BW). The filters were implemented and evaluated in terms of the root-mean-square error (RMSE) of the measured sound field, which was filtered, in relation to the simulated acoustic field (gold standard). As a compromise between effective filtering and signal non-distortion, a method to model the MA kernel length was proposed. All the filters reduced the noise of the measured acoustic field. The HW and the BW filters were more effective (RMSE = 4.01%) than the MA filter (RMSE = 4.28%). In spite of the small quantitative difference, acoustic field comparisons showed qualitative improvements.

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Design and fabrication of novel sensor for high pressure measurement of acoustic wave

Aoxuan

Cao

Wang

et al. 2019

2019 14th IEEE International Conference on Electronic Measurement &Amp; Instruments (ICEMI)

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Development of a PVDF needle-type hydrophone for measuring ultrasonic fields

Cited by 4 publications

References 13 publications

Research on detection and localization of buoyancy material damage in manned submarine vehicles based on PVDF spherical transducers and wavelet threshold denoising

Research on detection and localization of buoyancy material damage in manned submarine vehicles based on PVDF spherical transducers and wavelet threshold denoising

Comparison of Three Linear Digital Filters Applied to Improve the Quality of the Measured Acoustic Field

Design and fabrication of novel sensor for high pressure measurement of acoustic wave

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