Home
>
Journals & magazines
>
IEE Proceedings - Science, Measurement and Techno...
>
Volume 146
Issue 1
IEE Proceedings - Science, Measurement and Technology
Volume 146, Issue 1, January 1999
Volumes & issues:
Volume 146, Issue 1
January 1999
Editorial: Premium awards
- Author(s): G. Chantry and M. Cunningham
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, page: 1 –1
- DOI: 10.1049/ip-smt:19990032
- Type: Article
- + Show details - Hide details
-
p.
1
(1)
-
- Author(s): Y. Du and J. Burnett
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 2 –8
- DOI: 10.1049/ip-smt:19990090
- Type: Article
- + Show details - Hide details
-
p.
2
–8
(7)
Extremely low frequency (ELF) magnetic fields from large current-carrying conductors are causing concern in high rise office buildings because of the potential to cause interference with sensitive equipment. ELF fields produced by multi-core power distribution cables are discussed. A theoretical model for calculating the magnetic field produced by such cables is presented, which is validated by experiment. It is found that the magnitude of the field with distance decays at a rate greater than exponentially, and that the phase angle of the field changes spatially. Based on the model, simplified formulas are derived which can fully characterise the magnetic field produced by a multi-core power cable. The ELF fields predicted by the formulas are validated by measurements, and are found to be highly accurate at distances > 0.2 m. Other issues concerning the installation of power cables in buildings are also discussed. - Author(s): Z. Ren
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 9 –14
- DOI: 10.1049/ip-smt:19990005
- Type: Article
- + Show details - Hide details
-
p.
9
–14
(6)
The thin cracks in three-dimensional eddy current problems, frequently encountered in nondestructive testing applications, are modelled by surface domains of zero thickness. The double layer nodal and edge shell elements are employed in the dual eddy current formulations for the interpolation of scalar and vector potentials in the cracks. With the help of shell elements, the volume integrals corresponding to the magnetic energy and joule losses in the cracks are transformed to surface integrals. This modelling allows consideration of the field jump across the thin cracks provided that the field continuity on the edge of the crack is correctly taken into account. An eddy current problem in presence of thin cracks is solved using the model and results are compared with those of conventional finite element modelling. - Author(s): B.Z. Kaplan and G. Sarafian
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 15 –20
- DOI: 10.1049/ip-smt:19990002
- Type: Article
- + Show details - Hide details
-
p.
15
–20
(6)
Magnetic levitation by tuned circuits is a known method for freely suspending ferromagnetic objects. Though the method yields a relatively simple system which includes a surprisingly small number of components, it exhibits complicated dynamics. As a result, stabilisation of these levitators is a complex task. It is shown that, by employing chaos theory and by applying methods of control developed in association with chaotic systems, the stabilisation of the present levitator is made simpler, and can be achieved at lower source frequencies. This reduction of source frequency is shown to be of practical value. Furthermore, a measure known among chaos researchers (the correlation dimension) for assessing the complexity of chaotic systems has been found to be valuable for evaluating and developing the novel stabilisation method. - Author(s): G. Betta ; C. Liguori ; A. Pietrosanto
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 21 –26
- DOI: 10.1049/ip-smt:19990001
- Type: Article
- + Show details - Hide details
-
p.
21
–26
(6)
The problem of uncertainty analysis in digital signal processing algorithms is discussed, proposing a method based on a ‘white box’ approach. A theoretical uncertainty estimation is carried out first; its results are then confirmed by both simulation and experimental tests. The characteristics of the method are highlighted by means of a practical application to some common algorithms for measurements on periodic signals. - Author(s): P. Arpaia ; G. Betta ; A. Langella ; E. Sacco
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 27 –34
- DOI: 10.1049/ip-smt:19990006
- Type: Article
- + Show details - Hide details
-
p.
27
–34
(8)
The real-time verification of the correct functioning of a measurement system is not only seldom performed, but also done using fairly ineffective statistical tools such as traditional Shewhart control charts. By considering measurement results reported in a control chart as a digital image, two digital-image-processing algorithms are proposed for the early fault diagnosis (detection and identification) of measurement processes. The first algorithm exploits a uniform-approximation technique to face mainly problems of the measurement process and/or instrument drifts. The second is based on the Hough transform to approach cyclic phenomena also for low signal-to-noise ratios. Results of the numerical characterisation and experimental validation demonstrate the practical applicability and the effectiveness of the proposed algorithms. - Author(s): R. Aouli ; M. Akroune ; M.A. Dami ; A. Mouillet
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 35 –39
- DOI: 10.1049/ip-smt:19990004
- Type: Article
- + Show details - Hide details
-
p.
35
–39
(5)
The authors deal with measurement of iron losses under a rotating magnetic field for electrical steel alloys used in the building of rotating electrical machines. The authors note the main characteristics needed by such devices. They then describe the realisation and the use of a machine built in the laboratory. Test results obtained for two kinds of magnetic sheet show the conjunct influences of the classical electromagnetic parameters (fundamental frequency, average flux density) and the machine design parameters closely linked to the sheet anisotropy (wavelength, radial width of the yoke). Finally, the consequences for machine design are highlighted. - Author(s): R. Blue ; D. Uttamchandani ; C.G. Wilson
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 41 –46
- DOI: 10.1049/ip-smt:19990009
- Type: Article
- + Show details - Hide details
-
p.
41
–46
(6)
The determination of the concentration of drugs and other compounds within the anterior chamber of the eye is a measurement of great interest in ophthalmic science. A minimally invasive optoelectronic technique to identify and measure various compounds using absorption and fluorescence spectroscopy, and involving fibre optics, is described. These experiments demonstrate the technical feasibility of an optoelectronic instrument for drug concentration estimation in the anterior chamber by employing absorption measurements. Both model and real animal eyes were used in the experiments. Compounds such as fluorescein and tetracycline, the latter a commonly used antibiotic for ophthalmic applications, have been detected in the anterior chamber of perfused animal eyes using this technique. - Author(s): W.Q. Yang and T.A. York
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 47 –53
- DOI: 10.1049/ip-smt:19990008
- Type: Article
- + Show details - Hide details
-
p.
47
–53
(7)
Electrical capacitance tomography (ECT) is a new technology that is used to visualise the internal behaviour of industrial processes comprising dielectric components. A particular difficulty with capacitance measurement for tomography is that the stray capacitance to earth of an ECT sensor is large (~150 pF) compared with the interelectrode capacitance to be measured (usually <0.5 pF), and the measurement range is wide (0.01–2 pF). The authors present a highly sensitive AC-based capacitance measuring circuit, which has been specially designed for this purpose, and a PC-based ECT system with this circuit. Experimental results show that this ECT system can measure as small as 0.01 pF capacitance with 0.0002 pF error, and could collect tomographic image data at more than 100 frames per second. - Author(s): J.R. Wait
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, page: 54 –54
- DOI: 10.1049/ip-smt:19990007
- Type: Article
- + Show details - Hide details
-
p.
54
(1)
- Author(s): S. Sali and F. Han
- Source: IEE Proceedings - Science, Measurement and Technology, Volume 146, Issue 1, p. 54 –55
- DOI: 10.1049/ip-smt:19990089
- Type: Article
- + Show details - Hide details
-
p.
54
–55
(2)
ELF magnetic fields from nonarmoured multi-core power cables
Solving 3-D eddy current problem containing thin cracks using dual formulations and shell elements
Employing chaos tools and methods in magnetic levitation
Structured approach to estimate the measurement uncertainty in digital signal elaboration algorithms
Measurement process control by means of algorithms based on digital image processing
Iron loss measurement device under rotating magnetic field
Minimally invasive optoelectronic sensing technique for chemical analysis of aqueous humour
New AC-based capacitance tomography system
Comment: Response of underground multiconductor cable systems to external fields illumination
Reply: Response of underground multiconductor cable systems to external fields illumination
Most viewed content for this Journal
Article
content/journals/ip-smt
Journal
5
Most cited content for this Journal
We currently have no most cited data available for this content.