Course detail

Spectroscopic methods for non-destructive diagnostics

FEKT-DFY2Acad. year: 2011/2012

The subject of the seminar are three methods, dealing with the description, experimental investigation and localisation of defects, namely noise non-destructive spectroscopy, partial discharges based diagnostics and dielectric relaxation spectroscopy. Main topics cover transport and stochastic processes, noise non-destructive spectroscopy, non-destructive diagnostics, reliability tests, mechanisms of of partial discharges and polarisation mechanisms at a microscopic level, mathematical and physical description of dielectric polarisation, dielectric relaxation spectroscopy.

Language of instruction

Czech

Number of ECTS credits

Mode of study

Not applicable.

Guarantor

doc. Ing. Karel Liedermann, CSc.

Department

Department of Physics (UFYZ)

Learning outcomes of the course unit

After the course, students should be able to distiguish between stationary and non-stationary processs, understand physical mechanisms of noise and excessive carrier transport and be able to determine the reliability indicators of a given circuit element. Furthermore, they should understand the microphysical nature of polarization processes and partial discharges, including their mathematical description. Based on these tools, the students should be able to design and to develop diagnostic methods for the individual particular applications.

Prerequisites

MEng/MSc degree or equivalent in Electrical Engineering, Materials, Physics or Chemistry.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.

Assesment methods and criteria linked to learning outcomes

Not applicable.

Course curriculum

Types of defects, surface and structural defects, methods of localisation, destructive and non-destructive defects and their identification
Identification of defects from transport characteristics, V-A characteristics v in forward and reverse direction, excess current, generation-recombination process, degradation
Fluctuation processes, noise spectral power density and its correlation with the type of defect, low-frequency noise as reliability and quality indicator, lambda parameter - mean time to failure and its quantification
Noise density in semiconductor devices, noise in homogenous structures and in thin-layer and thick-layer resistors
Partial discharges and noise in insulators and dielectrics, noise in capacitors
Noise in semiconductor lasers, alloy and FET transistors
RTS noise of semiconductor diodes with quantum holes and dots
Theory for the design of a concept of a non-destructive diagnostic test
Phenomenological description of the polarisation
Types of relaxation mechanisms in polymers, glasses and ceramic systems
Mathematical methods for the evaluation of dielectric data
Degradation processes and their observation and monitoring by dielectric methods

Work placements

Not applicable.

Aims

The objective of the course is the study, both theoretical and experimental, of transport, relaxation and stochastic processes in solids. Students will learn the basic methods in reliability analysis, degradation and noise and dielectric spectroscopy. The key objective of the seminar is, however, not so much a mere acquisition of theoretical and experimental finding but rather a deeper understanding of the physical nature of all three spectroscopic methods and the ability to use and develop these methods for practical applications.

Specification of controlled education, way of implementation and compensation for absences

Not applicable.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Not applicable.

Type of course unit

Seminar

39 hod., compulsory

Teacher / Lecturer

doc. Ing. Karel Liedermann, CSc.
doc. RNDr. Milada Bartlová, Ph.D.
prof. Ing. RNDr. Josef Šikula, DrSc.

VUT

Faculties

University Institutes

Parts

Spectroscopic methods for non-destructive diagnostics

Type of course unit