J. Phys. IV France 129 (2005) 97-103
DOI: 10.1051/jp4:2005129021
The repeatability and reproducibility of calibrating signals generated by Hsu-Nielsen method
T. Boczar and M. LorencTechnical University of Opole, Faculty of Electrical Engineering and Automatics, Institute of Electric Power Engineering, ul. Sosnkowskiego 31, 45-272 Opole, Poland
Abstract
During the measurements of the acoustic emission signals
taken both in the laboratory and industrial conditions it is necessary to
carry out calibration of the measurement paths used. One of the basic
calibration methods is the one invented by Hsu-Nielsen, which consists in
generating an acoustic signal during breaking a scriber placed in a special
head put on an automatic pencil. The paper presents the measurement results
of acoustic signals taken at various structural parameters of calibrating
heads, which was done to determine their influence on the repeatability of
the results obtained. Moreover, the measurements were taken for ten
identical, in relation to their geometrical measurements, heads in order to
test the repeatability of the results obtained using the methods of
statistical inference. The paper characterizes the procedure methodology
during formulating statistical hypotheses and describes tests of goodness of
fit used for their verification. In Summing-up, based on the results
obtained, the usefulness of the Hsu-Nielsen method in calibrating
measurement paths used in the acoustic emission (AE) method of evaluating
the hazard degree by partial discharges (PD) of insulation systems of power
appliances was determined.
© EDP Sciences 2005