The paper describes the approach of 'stutter timing' that has been developed to improve the accur... more The paper describes the approach of 'stutter timing' that has been developed to improve the accuracy of measuring charge decay times in the presence of noise in compact and portable charge decay test instrumentation. The approach involves starting and stopping the timing clock as the noisy signal rises above and falls below the target threshold voltage level.
Propagating Brush Discharges are the most energetic electrostatic discharges encountered in indus... more Propagating Brush Discharges are the most energetic electrostatic discharges encountered in industrial situations. They arise when a thin insulator (
The paper describes practical aspects of instrumentation for long term monitoring of atmospheric ... more The paper describes practical aspects of instrumentation for long term monitoring of atmospheric electric fields. Particular features discussed include the separation gaps needed between sensing surface components, the use of charge sensitive amplifiers to minimise the influence of water over insulation surfaces, avoidance of the need for earthing of the rotating chopper and the use of continuous ‘operational health ’ monitoring to confirm continuity of measurement performance. Comments are included on features for simultaneous and separate observation of atmospheric and power line electric fields and on the use and interpretation of pole mounted fieldmeters. 1.
Abstract: It appears there is renewed interest in consideration of ways to assess the electrostat... more Abstract: It appears there is renewed interest in consideration of ways to assess the electrostatic suitability of materials. The present paper comments on a number of existing standard Test Methods and notes some of the features that need to be taken into account for more modern materials and applications. Corona charge decay measurement has been used for many years as a practical and justified approach to the assessment of a wide variety of materials- including fabrics, plastic films, papers, solid surfaces, powders and liquids. Experimental measurements will be shown to illustrate present approaches for corona charge decay assessment. This will include observations on capacitance loading measurement and opportunities to predict very long decay times from modest observation periods.
PURPOSE: To obtain a method adequate for preparation of colored paper of multiple colors used for... more PURPOSE: To obtain a method adequate for preparation of colored paper of multiple colors used for thermal transfer printing and a device therefor. CONSTITUTION: Liquid is supplied to many liquid spraying nozzles 32 and a high potential is impressed thereto to form plural nearly parallel liquid ligaments simultaneously drawn from these nozzles by powerful electrostatic force. A base material 12 is transferred relative to the nozzle, thereby, the substrate is subjected to coating. The coating is executed in two modes. One thereof is a mode to periodically shut off the supply of the liquid and another one is a mode to electrostatically deflect the belt-shaped liquid ligaments from the substrate to the separating direction. COPYRIGHT: (C)1993,JPO
1 Hazard Assessment of High Speed Rubber Dissolution in Toluene Using Computer Modelling of Elect... more 1 Hazard Assessment of High Speed Rubber Dissolution in Toluene Using Computer Modelling of Electric Fields and Potentials I D Pavey, Principal Electrostatics Specialist, DEKRA Insight, e-mail: ian.pavey@dekra.com. J M Butcher, Head of Process Safety Consultancy, DEKRA Insight, e-mail: john.butcher@dekra.com. W Azizi, Process Safety Specialist, DEKRA Insight, e-mail: wahid.azizi@dekra.com. S G Farnworth, General Manager, ITAC Limited, e-mail: SFarnworth@itac.uk.com.
with a BSc in Chemical Engineering. After acquiring practical experience of electrostatic hazards... more with a BSc in Chemical Engineering. After acquiring practical experience of electrostatic hazards while working as a process development engineer, he gained an M.Phil. in Applied Electrostatics at the University of Southampton. Thereafter he specialised in electrostatic applications, problems and hazards. Ian worked for ICI for 11 years on projects involving electrostatic applications research and development. Now Ian is Principal Electrostatics Specialist at DEKRA Process Safety (formerly Chilworth Technology). Whilst at DEKRA Insight, Ian has been responsible for a variety of problem solving and research projects where electrostatics is involved. These have included powder and liquid handling problems and applications. Ian has led multinational research projects under EC Framework programmes, including one investigating powder handling and processing problems caused by static electricity in industrial processes, and one aimed at developing new tests for anti-static footwear. In addition Ian has more than 20 years' experience of fire and explosion hazard assessment, investigation and training. Many companies are talking about safety, but at DEKRA we're doing something about it! During his career spanning more than 30 years Ian has published numerous articles covering subjects from new electrostatic applications to powder handling problems to fundamental research leading to new understanding of hazardous situations. In addition, he is a named inventor on a number of patents in areas from electrostatic sprays for agricultural purposes to electrostatic fibre production for liquid crystal displays. Ian is a member of: the Institute of Physics' Electrostatics Group (and a committee member); the Institution of Chemical Engineers' Safety and Loss Prevention Group; British Standards GEL 101 committee (the UK shadow for the International Electrotechnical Commission's Technical Committee on electrostatics); the Electrostatics Society of America and; the Electrostatic Discharge Association. Welcome to DEKRA. We offer made-to-measure consulting services including laboratory analyses, classification of dangerous substances, and preparation of Safety Data Sheets. In addition, for ensuring on-site compliance with the legislation, our experienced specialists are available to visit your company's site, acting as Dangerous Goods Safety Advisors or assisting in hazard assessments.
IEE Colloquium on ESD (Electrostatic Discharge) and ESD Counter Measures, 1995
... Ian Pavey and Jason Kerr are with Chilwoth Technology Ltd, Southampton, who specialise in tec... more ... Ian Pavey and Jason Kerr are with Chilwoth Technology Ltd, Southampton, who specialise in technical safety and electrostatic applications and problems. 0 1995 The Institution of Electrical Engineers. Printed and published by the IEE. Savoy Place, London WCPR OBL. UK. ...
The paper describes the approach of 'stutter timing' that has been developed to improve the accur... more The paper describes the approach of 'stutter timing' that has been developed to improve the accuracy of measuring charge decay times in the presence of noise in compact and portable charge decay test instrumentation. The approach involves starting and stopping the timing clock as the noisy signal rises above and falls below the target threshold voltage level.
The paper describes the approach of 'stutter timing' that has been developed to improve the accur... more The paper describes the approach of 'stutter timing' that has been developed to improve the accuracy of measuring charge decay times in the presence of noise in compact and portable charge decay test instrumentation. The approach involves starting and stopping the timing clock as the noisy signal rises above and falls below the target threshold voltage level.
Propagating Brush Discharges are the most energetic electrostatic discharges encountered in indus... more Propagating Brush Discharges are the most energetic electrostatic discharges encountered in industrial situations. They arise when a thin insulator (
The paper describes practical aspects of instrumentation for long term monitoring of atmospheric ... more The paper describes practical aspects of instrumentation for long term monitoring of atmospheric electric fields. Particular features discussed include the separation gaps needed between sensing surface components, the use of charge sensitive amplifiers to minimise the influence of water over insulation surfaces, avoidance of the need for earthing of the rotating chopper and the use of continuous ‘operational health ’ monitoring to confirm continuity of measurement performance. Comments are included on features for simultaneous and separate observation of atmospheric and power line electric fields and on the use and interpretation of pole mounted fieldmeters. 1.
Abstract: It appears there is renewed interest in consideration of ways to assess the electrostat... more Abstract: It appears there is renewed interest in consideration of ways to assess the electrostatic suitability of materials. The present paper comments on a number of existing standard Test Methods and notes some of the features that need to be taken into account for more modern materials and applications. Corona charge decay measurement has been used for many years as a practical and justified approach to the assessment of a wide variety of materials- including fabrics, plastic films, papers, solid surfaces, powders and liquids. Experimental measurements will be shown to illustrate present approaches for corona charge decay assessment. This will include observations on capacitance loading measurement and opportunities to predict very long decay times from modest observation periods.
PURPOSE: To obtain a method adequate for preparation of colored paper of multiple colors used for... more PURPOSE: To obtain a method adequate for preparation of colored paper of multiple colors used for thermal transfer printing and a device therefor. CONSTITUTION: Liquid is supplied to many liquid spraying nozzles 32 and a high potential is impressed thereto to form plural nearly parallel liquid ligaments simultaneously drawn from these nozzles by powerful electrostatic force. A base material 12 is transferred relative to the nozzle, thereby, the substrate is subjected to coating. The coating is executed in two modes. One thereof is a mode to periodically shut off the supply of the liquid and another one is a mode to electrostatically deflect the belt-shaped liquid ligaments from the substrate to the separating direction. COPYRIGHT: (C)1993,JPO
1 Hazard Assessment of High Speed Rubber Dissolution in Toluene Using Computer Modelling of Elect... more 1 Hazard Assessment of High Speed Rubber Dissolution in Toluene Using Computer Modelling of Electric Fields and Potentials I D Pavey, Principal Electrostatics Specialist, DEKRA Insight, e-mail: ian.pavey@dekra.com. J M Butcher, Head of Process Safety Consultancy, DEKRA Insight, e-mail: john.butcher@dekra.com. W Azizi, Process Safety Specialist, DEKRA Insight, e-mail: wahid.azizi@dekra.com. S G Farnworth, General Manager, ITAC Limited, e-mail: SFarnworth@itac.uk.com.
with a BSc in Chemical Engineering. After acquiring practical experience of electrostatic hazards... more with a BSc in Chemical Engineering. After acquiring practical experience of electrostatic hazards while working as a process development engineer, he gained an M.Phil. in Applied Electrostatics at the University of Southampton. Thereafter he specialised in electrostatic applications, problems and hazards. Ian worked for ICI for 11 years on projects involving electrostatic applications research and development. Now Ian is Principal Electrostatics Specialist at DEKRA Process Safety (formerly Chilworth Technology). Whilst at DEKRA Insight, Ian has been responsible for a variety of problem solving and research projects where electrostatics is involved. These have included powder and liquid handling problems and applications. Ian has led multinational research projects under EC Framework programmes, including one investigating powder handling and processing problems caused by static electricity in industrial processes, and one aimed at developing new tests for anti-static footwear. In addition Ian has more than 20 years' experience of fire and explosion hazard assessment, investigation and training. Many companies are talking about safety, but at DEKRA we're doing something about it! During his career spanning more than 30 years Ian has published numerous articles covering subjects from new electrostatic applications to powder handling problems to fundamental research leading to new understanding of hazardous situations. In addition, he is a named inventor on a number of patents in areas from electrostatic sprays for agricultural purposes to electrostatic fibre production for liquid crystal displays. Ian is a member of: the Institute of Physics' Electrostatics Group (and a committee member); the Institution of Chemical Engineers' Safety and Loss Prevention Group; British Standards GEL 101 committee (the UK shadow for the International Electrotechnical Commission's Technical Committee on electrostatics); the Electrostatics Society of America and; the Electrostatic Discharge Association. Welcome to DEKRA. We offer made-to-measure consulting services including laboratory analyses, classification of dangerous substances, and preparation of Safety Data Sheets. In addition, for ensuring on-site compliance with the legislation, our experienced specialists are available to visit your company's site, acting as Dangerous Goods Safety Advisors or assisting in hazard assessments.
IEE Colloquium on ESD (Electrostatic Discharge) and ESD Counter Measures, 1995
... Ian Pavey and Jason Kerr are with Chilwoth Technology Ltd, Southampton, who specialise in tec... more ... Ian Pavey and Jason Kerr are with Chilwoth Technology Ltd, Southampton, who specialise in technical safety and electrostatic applications and problems. 0 1995 The Institution of Electrical Engineers. Printed and published by the IEE. Savoy Place, London WCPR OBL. UK. ...
The paper describes the approach of 'stutter timing' that has been developed to improve the accur... more The paper describes the approach of 'stutter timing' that has been developed to improve the accuracy of measuring charge decay times in the presence of noise in compact and portable charge decay test instrumentation. The approach involves starting and stopping the timing clock as the noisy signal rises above and falls below the target threshold voltage level.
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