A Flow Velocity Measurement Method Based on a PVDF Piezoelectric Sensor

Li, Qi; Xing, Junhua; Shang, Dajing; Wang, Yilin

doi:10.3390/s19071657

Cited by 35 publications

(28 citation statements)

References 16 publications

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“…Flow velocity measurement sensors. With the knowledge of turbulent boundary layers and piezoelectric effect, Li et al proposed a design of making flow velocity sensors using PVDF films ( Figure 20 ) [ 135 ]. The positive correlation between the square of output voltage and the sixth power of flow speed was found during testing.…”

Section: Applications Of Piezoelectric Electrospun Pvdf Filmsmentioning

confidence: 99%

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

Kalimuldina

Turdakyn

Abay

et al. 2020

Sensors

253

124

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With the increase of interest in the application of piezoelectric polyvinylidene fluoride (PVDF) in nanogenerators (NGs), sensors, and microdevices, the most efficient and suitable methods of their synthesis are being pursued. Electrospinning is an effective method to prepare higher content β-phase PVDF nanofiber films without additional high voltage poling or mechanical stretching, and thus, it is considered an economically viable and relatively simple method. This work discusses the parameters affecting the preparation of the desired phase of the PVDF film with a higher electrical output. The design and selection of optimum preparation conditions such as solution concentration, solvents, the molecular weight of PVDF, and others lead to electrical properties and performance enhancement in the NG, sensor, and other applications. Additionally, the effect of the nanoparticle additives that showed efficient improvements in the PVDF films was discussed as well. For instance, additives of BaTiO3, carbon nanotubes, graphene, nanoclays, and others are summarized to show their contributions to the higher piezo response in the electrospun PVDF. The recently reported applications of electrospun PVDF films are also analyzed in this review paper.

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Section: Applications Of Piezoelectric Electrospun Pvdf Filmsmentioning

confidence: 99%

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

Kalimuldina

Turdakyn

Abay

et al. 2020

Sensors

253

124

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“…In reference [26], measurement of volumetric velocity i.e., 3D velocity for the characterization of turbulent swirling flow is reported. In reference [27], a method for measurement of flow velocity using a polyvinylidene fluoride as a piezoelectric film is stated. Estimation of fluid flow through pump was discussed in reference [28] through modeling of pump.…”

Section: Referencesmentioning

confidence: 99%

A Soft Sensor for Estimation of In-Flow Rate in a Flow Process Using Pole Placement and Kalman Filter Methods

2019

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This article reports the design of a soft sensor for estimation of in-flow to the control valve in a flow process. The objective of the proposed work is to design and compare the performance of pole placement and Kalman filter-based observers. The observer is designed to estimate the in-flow from the measured out-flow. A mathematical model is derived for the considered physical plant using the system identification technique. An observer is designed using Pole Placement and Kalman Filter methods from the derived plant model. The obtained observer is implemented on a real-life setup for estimation of the in-flow rate. Results obtained from the designed observers are then analyzed to select the better observer. Comparison of performance based on results from Kalman Filter and Pole Placement method of observers shows that the former is more accurate, whereas the computation time is smaller in the latter. Results achieved from the designed soft sensor are verified using an electromagnetic flowmeter, and the results have a root-mean-square percentage error of 0.79%.

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“…The second, associated with heavy rainfall, is highly correlated with the rainfall rate, and is nearly white [3]. The study of rainfall noise is important to marine physics not only to study wind and rainfall over the ocean [4] but also for the use of sonars [5][6][7]. This is also important for biologists when studying the impact of artificially generated sound on marine mammals [8].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Underwater Acoustic Energy Radiated by Single Raindrops

Liu

Shang

et al. 2021

Sensors

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Underwater noise produced by rainfall is an important component of underwater ambient noise. For example, the existence of rainfall noise causes strong disturbances to sonar performance. The underwater noise produced by a single raindrop is the basis of rainfall noise. Therefore, it is necessary to study the associated underwater noise when drops strike the water surface. Previous research focused primarily on the sound pressure and frequency spectrum of underwater noise from single raindrops, but the study on its sound energy is insufficient. The purpose of this paper is to propose a method for predicting the acoustic energy generated by raindrops of any diameter. Here, a formula was derived to calculate the underwater sound energy radiated by single raindrops based on a dipole radiation pattern. A series of experiments were conducted to measure the underwater sound energy in a 15 m × 9 m × 6 m reverberation tank filled with tap water. The analysis of the acoustic energy characteristics and conversion efficiency from kinetic to acoustic energy helped develop the model to predict the average underwater sound energy radiated by single raindrops. Using this model, the total underwater sound energy of all raindrops during a rainfall event can be predicted based on the drop size distribution.

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A Flow Velocity Measurement Method Based on a PVDF Piezoelectric Sensor

Cited by 35 publications

References 16 publications

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

A Soft Sensor for Estimation of In-Flow Rate in a Flow Process Using Pole Placement and Kalman Filter Methods

Measurement of Underwater Acoustic Energy Radiated by Single Raindrops

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