Contribution to improving the spatial resolution of a pulsed electro acoustic cell measurement: An analysis of acoustics waves propagation

Pulsed electroacoustic (PEA) method is a very popular method for measurement of charge in dielectrics. In this method, an acoustic wave proportional to charge is generated by a pulsed HV. The acoustic wave traverses several material layers before being sensed and converted to electrical signal by a piezoelectric transducer. Due to multiple reflections in its path, a direct analysis of traveling acoustic wave would be complex. In this paper, we have proposed simulation of the physical model of the PEA method consisting of electrical and acoustic circuits. Using PSpice model of the method, authors have tried to address some design-related issues, which appear to have not been reported in earlier works. The acoustic circuit has been realized using analogy between acoustic wave and wave propagation in electric transmission line. The piezoelectric transducer is also modeled as a transmission line as in modified Leach's transducer model, except that, in the present case the transducer absorbs acoustic signal instead of generating. Approximate theoretical equations have been used to compare with simulations, wherever a comparison is possible, and found to match well in those cases.Index Terms-Charge measurement, PSpice model, pulsed electroacoustic (PEA) method.

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“…2, will have three components p 0 (t), p d (t), and p λ (t) [12]- [16], [25]- [30] and may be described as follows.…”

Section: Pea Measurement Methodsmentioning

confidence: 99%

Modeling and Simulation of Pulsed Electroacoustic Measurement Method

Chahal

Reddy

2014

IEEE Systems Journal

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“…Pulsed Electro-Acoustic (PEA) measurement techniques are nondestructive and, arguably, one of the most promising methods to provide the desired information on internal charge distributions related to spacecraft charging issues [1,2].…”

Section: Approachmentioning

confidence: 99%

“…It also gives insight into modifications to the PEA method that can be used to improve or better understand the method. Two models are presented: i) a ray-tracing model similar to many published models [1,[5][6][7][8][9][10][11][12][13][14][15], and ii) a full-wave model based on computing fields by satisfying boundary conditions at each interface [16,17].…”

Section: Pea Waveform Modelingmentioning

confidence: 99%

PEA System Modeling and Signal Processing for Measurement of Volume Charge Distributions in Thin Dielectric Films

Pearson¹,

Dennison

Griffiths³

et al. 2017

IEEE Trans. Plasma Sci.

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This paper discusses our effort to develop advanced pulsed electroacoustic (PEA) measurement system capabilities that incorporate (1) improved signal processing tools for increased signal/noise ratios; and (2) integrated PEA modeling tools. In addition, we emphasize state-of-the-art system electronic components, integrated environmental controls, and sensor improvements required to achieve high spatial resolution while maintaining reasonable temporal resolution for both ambient and in vacuo measurements of thin dielectrics charged using electron beam injection, which is most applicable for spacecraft charging tests. PEA measurement systems provide an important tool to investigate the spatial extent and dynamic evolution of embedded charge distributions in thin dielectric materials. This knowledge has important applications in spacecraft industries, as well as for semiconductors, high-power electronic devices, high-voltage DC power cable insulation, and high-energy and plasma physics apparatus. The emphasis of this paper is on improved signal processing methods and integrated PEA modeling tools.

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“…They also have widespread applications, including microelectronics, high-power electronic devices, high-voltage DC power cable insulation, high-energy accelerators, plasma physics facilities and deposition systems, and microwave generators [1]. Advantages of PEA method include nondestructive measurements, low cost, simplified modeling, and high spatial resolution typically on the order of 10 μm [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effects of Sample Adhesives Acoustic Properties on Spatial Resolution of Pulsed Electroacoustic Measurements

Gibson

Dennison

Pearson³

et al. 2018

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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The media chosen to couple the PEA stack (electrode/sample/sensor/backing) can affect the spatial resolution and shape of the response from a Pulsed Electroacoustic (PEA) system significantly. The PEA stack layers must be electrically and acoustically coupled to optimize the amplitude, quality, and spatial resolution of the PEA measurements. Various coupling layer materials were used with 250 µm thick polymethylmethacrylate (PMMA) samples and a standard ~10 μm thick PVDF sensor. Coupling layers tested in this study include no media (with substantial pressure applied), light machine oil, silicone oil, and cyanoacrylate (super glue). Pulse amplitudes of 2000 V and 5 ns width were used. Static 8 kV DC bias was applied to the sample in order to detect a signal, as the samples were initially free of charge, and to see the interfaces more clearly and showcase the differences in response from the various coupling media. The best option was found to be a single layer of cyanoacrylate at the ground electrodesample interface; this is the only viable option for in vacuo PEA measurements of the media tested.

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Contribution to improving the spatial resolution of a pulsed electro acoustic cell measurement: An analysis of acoustics waves propagation

Cited by 12 publications

References 7 publications

Modeling and Simulation of Pulsed Electroacoustic Measurement Method

Modeling and Simulation of Pulsed Electroacoustic Measurement Method

PEA System Modeling and Signal Processing for Measurement of Volume Charge Distributions in Thin Dielectric Films

Effects of Sample Adhesives Acoustic Properties on Spatial Resolution of Pulsed Electroacoustic Measurements

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