Abstract
In view of an extended programme on the evaluation of properties and defects of stainless-steel and Zircaloy thin-walled tubes, a basic study has been made of the optimum test conditions for applying eddy-current test rnethods.
An electronic apparatus has been built to define these conditions for a
great variety of test problems. Therefore, it was necessary to have the possibility
of changing the frequence over a wide range and to measure the two components of the complex impedance of the test coil separately. This has the
advantage over a measurement of the absolute value of the Impedance change
since this value has little meaning in view of the change of the properties
of the test object. The actual apparatus allows the precise and sensitive
measurement of the real and imaginary components of any test coil in a frequency range from 0,1 - 5OO kHz. A special type of modulation device has
been developed. The apparatus is not considered as an actual testing apparatus
; by determining optimum conditions for each case, it enables a reIatively simple and specific apparatus to be built.
Up to now, a detailed study of relationships between physical and electrical
properties of a specimen and the test-coil impedance has been performed
for tubular fueI-cIadding materials. Frequency and coiI configurations
are established for wall-thickness measurements and a particular apparatus
has been constructed ; the accuracy is better than 1 % and changes between
inner and outer diameter variations can be discriminated. Other specific
apparatus are studied and proposed.
An electronic apparatus has been built to define these conditions for a
great variety of test problems. Therefore, it was necessary to have the possibility
of changing the frequence over a wide range and to measure the two components of the complex impedance of the test coil separately. This has the
advantage over a measurement of the absolute value of the Impedance change
since this value has little meaning in view of the change of the properties
of the test object. The actual apparatus allows the precise and sensitive
measurement of the real and imaginary components of any test coil in a frequency range from 0,1 - 5OO kHz. A special type of modulation device has
been developed. The apparatus is not considered as an actual testing apparatus
; by determining optimum conditions for each case, it enables a reIatively simple and specific apparatus to be built.
Up to now, a detailed study of relationships between physical and electrical
properties of a specimen and the test-coil impedance has been performed
for tubular fueI-cIadding materials. Frequency and coiI configurations
are established for wall-thickness measurements and a particular apparatus
has been constructed ; the accuracy is better than 1 % and changes between
inner and outer diameter variations can be discriminated. Other specific
apparatus are studied and proposed.
| Original language | English |
|---|---|
| Publisher | SCK CEN |
| Number of pages | 21 |
| State | Published - May 1965 |
Publication series
| Name | SCK CEN Reports |
|---|---|
| Publisher | SCK CEN |
| No. | BLG-382 |