Imaging electrostatic fingerprints with implications for a forensic timeline

Watson, P.K.; Prance, R. J.; Beardsmore-Rust, S T; Prance, H.

doi:10.1016/j.forsciint.2011.02.024

Cited by 38 publications

(36 citation statements)

References 19 publications

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“…Results were obtained over a range of frequencies from 10 kHz to 11 MHz, with a spatial resolution of the order of 50 µm. In other applications we have already demonstrated the capability of achieving 1 µm resolution which also sets the limit for detection resolution of surface defects in dielectric materials [4], microscopic surface charge imaging [6] and the use of arrays of sensors to speed up the acquisition of images [7].Clearly, the detection resolution is essentially proportional to the spatial resolution and scales down with it making it possible to detect the sample defects of widths comparable to the dimension of the sense electrode. …”

Section: Discussionmentioning

confidence: 99%

Microscopic resolution broadband dielectric spectroscopy

Mukherjee

Watson

Prance

2011

J. Phys.: Conf. Ser.

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Article (Published Version) http://sro.sussex.ac.uk Mukherjee, S, Watson, P and Prance, R J (2011) Microscopic resolution broadband dielectric spectroscopy. Journal of Physics: Conference Series, 310 (1). 012003. ISSN 1742-6588 This version is available from Sussex Research Online: http://sro.sussex.ac.uk/45370/ This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the URL above for details on accessing the published version. Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Abstract. Results are presented for a non-contact measurement system capable of micron level spatial resolution. It utilises the novel electric potential sensor (EPS) technology, invented at Sussex, to image the electric field above a simple composite dielectric material. EP sensors may be regarded as analogous to a magnetometer and require no adjustments or offsets during either setup or use. The sample consists of a standard glass/epoxy FR4 circuit board, with linear defects machined into the surface by a PCB milling machine. The sample is excited with an a.c. signal over a range of frequencies from 10 kHz to 10 MHz, from the reverse side, by placing it on a conducting sheet connected to the source. The single sensor is raster scanned over the surface at a constant working distance, consistent with the spatial resolution, in order to build up an image of the electric field, with respect to the reference potential. The results demonstrate that both the surface defects and the internal dielectric variations within the composite may be imaged in this way, with good contrast being observed between the glass mat and the epoxy resin. Microscopic resolution broadband dielectric spectroscopy

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Section: Discussionmentioning

confidence: 99%

Microscopic resolution broadband dielectric spectroscopy

Mukherjee

Watson

Prance

2011

J. Phys.: Conf. Ser.

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“…The potential of the EPS for use in high density arrays, for example for EMG detection, is illustrated by work done for materials and semiconductor sensing applications. This demonstrates that the sensors are highly scaleable, with spatial resolutions demonstrated down to 6 m (Watson et al, 2010a(Watson et al, , 2010c. In addition, the high input impedance and lack of a conducting interface to the source ensures that adjacent sensors in an array do not cross-couple to each other and can therefore be closely packed.…”

Section: High Density and Flexible Electrode Arraysmentioning

confidence: 97%

“…This performance was given a boost over a decade ago by the introduction of the Electric Potential Sensor (EPS) (Clippingdale et al, 1991(Clippingdale et al, , 1994a(Clippingdale et al, , 1994b; R.J. Prance et al, 1998). This is a generic electric field measurement technology which has a wide range of applications beyond electrophysiology, including materials testing and characterisation (Gebrial et al, 2006a), imaging of static charge distributions for forensic applications (Watson et al, 2010c), detection of pressure induced voltages in rocks ) and electric field detection of nuclear magnetic resonance signals (R.J. Prance & Aydin, 2007). As an insulated, active electrode sensor, it requires no resistive contact with the source and relies on the displacement current through a capacitively coupled, thin, dielectric electrode coating.…”

Section: The Electric Potential Sensormentioning

confidence: 99%

Sensor Developments for Electrophysiological Monitoring in Healthcare

Prance¹

2011

Applied Biomedical Engineering

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“…Its electric potential sensing capability has been demonstrated in several applications such as body electrophysiology: characterizing human electro-cardiogram (ECG) in situ [9] and remotely [10], electroencephalogram (EEG) [11] human hydration assessment [12], non-destructive testing of composite materials [13], imaging electrical activity of integrated circuits [14], following the propagation of pulses in saline solutions [15], novel nuclear magnetic resonance (NMR or MRI) sensing probes real-time array imaging [16], and imaging electrostatic fingerprints [17].…”

Section: Electric Potential Sensorsmentioning

confidence: 99%

“…The EPS sensor falls in the capacitive sensor category, used to noninvasively sense the displacement currents induced by timevarying electric fields. The development of the electronics required for these sensors has been discussed in detail in previous publications [17,18].…”

Section: Electric Potential Sensorsmentioning

confidence: 99%

Functional characterization of developing heart in embryos using Electric Potential Sensors

Rendon-Morales

Prance

et al. 2016

2016 IEEE Sensors Applications Symposium (SAS)

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Abstract-The characterization of the electrocardiographic activity of the living zebrafish heart during early developmental stages is a challenging task. Most of the available techniques are limited to heartbeat rate quantification being this inaccurate. Other invasive methodologies require the insertion of electrodes noise isolated environments and advanced amplification stages making these techniques very expensive. In this paper, we present a novel and non-invasive sensor development to characterize the functional activity of the developing heart of in vivo zebrafish embryos. The design is based on the Electric Potential Sensing technology patented at Sussex which has been developed to achieve reproducibility and continuous detection. We present preliminary functional characterization data of the developing zebrafish heart starting at 3 days-post-fertilization. Results show that using the proposed system for mapping the electrocardiographic activity of the zebrafish heart at early developmental stages is successfully accomplished. This is the first time that such a sensitive sensor has been developed for measuring the electrical changes occurring on micron sized (< 100 µm) living samples such as the zebrafish heart Keywords-Biomedical sensors, cardiology, embryionic heart, Electric Potential Sensors, electrophysiology and electrocardiogram.

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Imaging electrostatic fingerprints with implications for a forensic timeline

Cited by 38 publications

References 19 publications

Microscopic resolution broadband dielectric spectroscopy

Microscopic resolution broadband dielectric spectroscopy

Sensor Developments for Electrophysiological Monitoring in Healthcare

Functional characterization of developing heart in embryos using Electric Potential Sensors

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