By Topic

# IEE Proceedings A - Physical Science, Measurement and Instrumentation, Management and Education - Reviews

## Filter Results

Displaying Results 1 - 10 of 10
• ### Piezoelectric devices

Publication Year: 1982, Page(s):285 - 307
Cited by:  Papers (3)
| | PDF (3127 KB)

The history of the discovery of piezoelectricity and its application in practical devices is traced from the late 19th century. The origin of the piezoelectric effect is outlined in terms of the symmetry of the materials, and Tables are given in which the electroelastic properties are listed for single crystals, ferroelectric ceramics and polymers which show the phenomenon. The applications of bot... View full abstract»

• ### Air-cored solenoid with a very small temperature coefficient of magnetic field

Publication Year: 1982, Page(s):308 - 311
| | PDF (409 KB)

The design is given for a solenoid which produces a uniform magnetic field, the magnitude of which is almost independent of temperature changes. The results of measurements of the temperature coefficient of magnetic field produced by such a solenoid are given. It is shown that by adjusting the dimensions of the solenoid, the temperature coefficient can be made very small. View full abstract»

• ### Effects of phase-controlled switching on metering

Publication Year: 1982, Page(s):312 - 315
| | PDF (293 KB)

In the common thyristor-controlled power ciicuit, the thyristor also functions as a convertor of power from the supply frequency to a very broad frequency spectrum. In general, a resistive load which is thyristor controlled has a inductive power factor, which approaches zero at large firing angles. Some of the harmonic power which is generated will be fed back to and redistributed by the supply ne... View full abstract»

• ### Digital method of wavelength control in a feedback velocimeter

Publication Year: 1982, Page(s):316 - 321
| | PDF (805 KB)

A digital method of wavelength control is described for a feedback velocimeter designed to measure the speed of steel strip. The measurement system, which has been described in an earlier paper, utilises the property of hysteresis of the steel strip and employs a wavelength-selective magnetic detector and a writing head upstream of the detector. Feedback causes a constant-wavelength magnetic patte... View full abstract»

• ### Method for the absolute calibration of current transformers

Publication Year: 1982, Page(s):322 - 327
Cited by:  Papers (4)
| | PDF (657 KB)

The paper describes an absolute method for calibrating current transformers. The method, described as a build-up technique, involves calibrating a standard transformer first on its 5/5 ratio by comparing its primary and secondary currents directly in a differential circuit, and then on its 10/5 ratio by comparing it with two auxiliary 5/5 transformers with their primaries in quasiparallel and thei... View full abstract»

• ### Life expectancy and failure mechanisms of lapped synthetic tape impregnated with supercritical helium

Publication Year: 1982, Page(s):328 - 331
Cited by:  Papers (6)
| | PDF (673 KB)

Investigations into the life expectancy and failure mechanisms of cable models comprising layers of wrapped polymer tape impregnated with supercritical helium are described. Over the limited times of the tests the life law Ertt = constant is seen to apply, and, for the materials comprehensively tested, i.e high-density polythene, Valeron, polypropylene and polysulphone, n was found to be in the ra... View full abstract»

• ### Effect of a symmetrically placed dielectric tube on the capacitance of a cylindrical cross-capacitor

Publication Year: 1982, Page(s):332 - 336
| | PDF (440 KB)

The change in the cross-capacitance of a cylindrical cross-capacitor of circular cross-section when a dielectric tube is coaxially placed inside it is analysed. It is further shown that the analysis can be adapted to estimate a similar change in the case of a cylindrical cross-capacitor of the Thompson type. View full abstract»

• ### Use of the computer code PE2D in the electrostatic modelling of an electron-beam-generator/vacuum-diode interface

Publication Year: 1982, Page(s):337 - 339
Cited by:  Papers (1)
| | PDF (520 KB)

The computer code PE2D has been used to optimise the design of a compact, 500 kV, low-inductance vacuum-diode interface assembly for SPRITE, a sophisticated electron beam pumped exciplex laser system under construction at Rutherford Appleton Laboratory (RAL). Electrostatic modelling of various dielectric interfaces has been achieved in cylindrical symmetry under conditions not amenable to more tra... View full abstract»

• ### Electrocardiomultigraphimeter as a basic instrument for developing effective personal computing in cardiology

Publication Year: 1982, Page(s):340 - 351
Cited by:  Papers (1)
| | PDF (1220 KB)

The question is posed as to whether personal medical computing can help significantly and efficiently in the development of new¿¿ instruments. The scientific and economic criteria for considering an instrument as new¿¿ are given; certain conditions are set out which, when confirmed, could lead to `new¿¿ instrumentation being developed from the personal computer, with better results than those pr... View full abstract»

• ### General Assembly of the International Union of Radio Science

Publication Year: 1982, Page(s):352 - 355
| PDF (702 KB)