Parameter estimation in dielectrometry measurements

Mamishev, A.V.; Takahashi, Akihiro; Du, Yiqun; Lesieutre, Bernard C.; Zahn, M.

doi:10.1016/s0304-3886(02)00068-2

Cited by 21 publications

(7 citation statements)

References 28 publications

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“…Sensors with (PEI-Urease) 3 and (PEI-Urease) 2 -PEI layer assemblies were tested in the presence of urea in the test solution. Results are presented in Figure 2.…”

Section: Urease Modified Sensormentioning

confidence: 99%

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Three‐Dimensional Interdigitated Electrode Array as a Tool for Surface Reactions Registration

et al. 2011

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Possible applications of a new transducer based on a three dimensional interdigitated electrode array (3D-IDEA) with electrode digits separated by an insulating barrier are discussed. Due to the presence of insulating barriers that separate the adjacent digits of the electrodes the main portion of the probing electrical current goes close to the surface of the barrier. Chemical modification of the barrier surface with the probe molecules permits to realise direct detection of subsequent target analytes in solution. The functional mechanism of the device is based on registration of changes in conductivity at the surface of the barrier provoked by electrical charge redistribution caused by surface chemical reactions. Three-dimensional sensor shows considerable improvement in sensitivity compared with a standard planar IDEA design sensors. The potential of the developed device as a sensor transducer to detect various chemical and bio chemical reactions is demonstrated. Examples include enzyme immobilisation, polyelectrolytes layer-by-layer deposition, covalent chemical modification with molecules containing reactive thiol groups.

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“…Sensors with (PEI-Urease) 3 and (PEI-Urease) 2 -PEI layer assemblies were tested in the presence of urea in the test solution. Results are presented in Figure 2.…”

Section: Urease Modified Sensormentioning

confidence: 99%

“…dimensions and interspacing. It is generally accepted [3] that 80 % of the total signal is enclosed in a certain region close to the electrode surface. Electric field penetrates within the distance equal to the distance between centres of two adjacent electrodes.…”

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Interdigitated Electrode Array as a Tool for Surface Reactions Registration

et al. 2011

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“…Previous work has confirmed that the CI technique is useful in detecting both surface and hidden features in insulators and materials with very low conductivity such as composites and concrete [23,24], while this work is focussed on the detection of surface features on conductors. Related techniques using capacitive sensors have also been described, in which the capacitive sensors were used to characterise the properties of a specimen [25,26], to precisely define the edges of surface slots in conductors [27], to image buried object (e.g. landmine and unexploded ordnance) [28], etc.…”

Section: Introductionmentioning

confidence: 99%

Detecting surface features on conducting specimens through an insulation layer using a capacitive imaging technique

Yin

Hutchins

Chen

2012

NDT & E International

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“…As a first step, the dielectric permittivity and conductivity of the first layer (fluid layer) is determined from 1 mm wavelength admittance measurements together with precalculated solution spaces discussed in [13]. This method assumes that the material above the sensor is homogeneous and is of semi-infinite extent.…”

Section: B Estimation Agorithmmentioning

confidence: 99%

Uncertainty in multiple penetration depth fringing electric field sensor measurements

Mamishev

Cantrell

et al. 2002

IEEE Trans. Instrum. Meas.

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Abstract-Measurement of multilayer material properties with fringing electric field dielectrometry sensors requires the processing of terminal admittance data from multiple electrode pairs. The choice of the algorithmic approach for data analysis is critical because of a high sensitivity to small measurement uncertainties. While individual channel uncertainties are usually within a reasonable instrumentation range, measurement of properties of multiple material layers fails unless special techniques are used to prevent numerical instabilities. This paper demonstrates the mechanism of uncertainty in a successive stair-step property estimation in which the estimates of one layer's properties are used to estimate the subsequent layer's properties. Three-wavelength measurements of dielectric permittivity and conductivity illustrate the problem in two-layer experimental setups. Limitations of the stair-step approach and possible future improvements are discussed.

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Parameter estimation in dielectrometry measurements

Cited by 21 publications

References 28 publications

Three‐Dimensional Interdigitated Electrode Array as a Tool for Surface Reactions Registration

Three‐Dimensional Interdigitated Electrode Array as a Tool for Surface Reactions Registration

Detecting surface features on conducting specimens through an insulation layer using a capacitive imaging technique

Uncertainty in multiple penetration depth fringing electric field sensor measurements

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