Analysis of spatial distribution of charges and dipoles in electrets by a transient heating technique

Collins, Richard

doi:10.1063/1.322521

Cited by 171 publications

(36 citation statements)

References 7 publications

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“…For many years, thermal pulses generated by flashlamps or pulsed lasers have been used to probe electric field/ polarization profiles [1][2][3][4][5][6][7][8] or thermal properties [9][10][11][12][13][14] of electrically insulating materials. The flash method 9 is widely used to determine the thermal diffusivity of planar samples from the transient temperature rise of the back surface after flashheating the front surface.…”

Section: Introductionmentioning

confidence: 99%

“…The flash method 9 is widely used to determine the thermal diffusivity of planar samples from the transient temperature rise of the back surface after flashheating the front surface. The thermal pulse ͑TP͒ method [2][3][4][5] is used to determine electric-field profiles in charged or polarized dielectrics from the transient pyroelectric response stimulated by pulse-heating a metal electrode coating the incident surface. This response, referred to as the TP response, is taken as the charge q(t) flowing from one electrode to the other in an external short circuit.…”

Section: Introductionmentioning

confidence: 99%

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Electric-field profile and thermal properties in substrate-supported dielectric films

2000

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The transient pyroelectric response of a dielectric film on a substrate is used to determine both the electricfield profile across the film and its thermal properties. The response is a convolution of the field and temperature profile. A closed-form expression for the transient temperature profile is obtained for a generic model in terms of thermal parameters. This expression allows analysis of the pyroelectric response using an iterative procedure consisting of deconvolution and variation of thermal parameters. Tikhonov regularization is used in the deconvolution with a Honerkamp-Weese self-consistent regularization parameter. Simulations show that, at least in the cases tested, the electric-field profile, the thermal diffusivity and conductivity ͑and thus the heat capacity, which is their ratio͒, and the thermal resistance of the dielectric/substrate interface can be determined. Experiments on polyimide films adhered to substrates unambiguously reveal bound negative charge within a small depth of the free surface of virgin samples and also weaker, broader charge distributions injected from the substrate in samples under an applied voltage. The analysis resolves both sharp and broad features and gives thermal properties characteristic of the near-surface region, suggesting that the heat capacity may be significantly higher in this region than in the bulk.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electric-field profile and thermal properties in substrate-supported dielectric films

2000

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“…The TPM has been introduced in 1976 by Collins,26,27 and its principle of operation is represented in Figure 2. This method is based on a thermal pulse generated by a flash of light (8 µs of duration), which acts on one of the double-metalized surfaces of the sample.…”

Section: A the Thermal Pulse Methodsmentioning

confidence: 99%

Contributed Review: Review of thermal methods for space charge measurement

Imburgia

Romano

Caruso

et al. 2016

Review of Scientific Instruments

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Decay of space charge in conjugated polymers measured using pyroelectric current transients J. Appl. Phys. 93, 2884 (2003) The space charge accumulation phenomenon has garnered great interest over the last two decades because of the increased use of direct current in high voltage electrical systems. In this context, a significant relevance has been achieved by the thermal methods, used for solid dielectrics. This paper presents a review of this non-destructive measurement system used for the measurement of space charge. The thermal pulse method, the thermal step method, and the laser intensity modulation method are described. For each configuration, the principle of operation, the thicknesses analyzed, and the spatial resolution are described, reporting also the main related applications. Published by AIP Publishing. [http://dx

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“…These changes in turn give rise to a short-circuit current between the metal electrodes at the front and rear surfaces which contain information on the depth-profile of the internal electric field. Thermal profiling has been implemented both in the frequency domain (commonly referred to as the laser intensity modulation method (LIMM) [5]), and in the time domain (thermal pulse (TP) [6] and thermal step [7] methods). It is related to photopyroelectric measurements with pulsed lasers [8,9].…”

Section: Introductionmentioning

confidence: 99%

Thermal-Pulse Tomography of Space-charge and Polarization Distributions in Electret Polymers

et al. 2008

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A new, non-destructive technique for the analysis of electret materials is presented. Thermal-pulse tomography produces three-dimensional images of spacecharge and polarization distributions with a lateral resolution of better than 50 µm and a depth resolution of less than 0.5 µm. A focused-pulsed laser heats a circular spot on the opaque upper electrode. While diffusing through the sample, the thermal pulse causes local changes in the sample geometry or dielectric properties, resulting in a short-circuit current in the presence of space charge or electric dipoles. From the transient current, the distribution of the internal electric field can be reconstructed by means of scale transformation or regularization methods.

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Analysis of spatial distribution of charges and dipoles in electrets by a transient heating technique

Cited by 171 publications

References 7 publications

Electric-field profile and thermal properties in substrate-supported dielectric films

Electric-field profile and thermal properties in substrate-supported dielectric films

Contributed Review: Review of thermal methods for space charge measurement

Thermal-Pulse Tomography of Space-charge and Polarization Distributions in Electret Polymers

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