21

■■ Robust design with long-term stability■■ User-friendly operator and analysis inter-

face

■■ Simple adaptation to measuring task■■ Radiation harmless to health

The system

■■ Contact-free: the specimen does not

come into contact with any coupling

medium■■ Simple integration of compact measure-

ment modules into existing production

and quality systems

■■ Specimens with internal cavities can be

analyzed■■ Inspection of green ceramics and sin-

tered ceramics ■■ Measurement in transmission and reflec-

tion configuration

The benefits

Non-destructive testing using terahertz measurement techniques

The testing of ceramic materials makes high demands on the selected test procedure.

Terahertz measurement techniques allow measurements on the surface and in the interior

space of ceramic specimens. Terahertz measurements are contact-free and do not require

any additional coupling medium, thus avoiding the not uncommon problem of residue re-

moval. In contrast to contactless X-ray techniques, terahertz measurement techniques

present no health risks.

Thickness, defects, cavities and pores can be reliably and clearly detected using this mea-

surement technology.

Technical ceramics

© Fraunhofer ITWM 2017mc_flyer_technische-keramiken_EN

Fraunhofer-Institut für Techno- und

Wirtschaftsmathematik ITWM

Fraunhofer-Platz 1

67663 Kaiserslautern

Germany

Kontakt

Dr. Joachim Jonuscheit

Phone +49 631 31600-49 11

joachim.jonuscheit@itwm.fraunhofer.de

www.TeraTec.org

www.itwm.fraunhofer.de/en

1 + 2 Ceramic compo-

nents such as aircraft en-

gines or insulators can be

tested non-destructively

and in a contact-free man-

ner using terahertz mea-

surement techniques

F R A U N H O F E R I N S T I T U T E F O R I N d U S T R I A l M A T H E M A T I c S I T W M

3 4

1

2

3

180 µm

30 mm

151 µm

143 µm

30 m

m

0 5 10 15 20 25 30 35

0

5

10

15

20

25

30

35

Y / m

m

X / mm

laye

r th

ickn

ess /

μm

200

150

175

125

Mechanical measure

Laye

r th

ickn

ess

/µm

point of measurement0 1 2 3 4 5 6 7 8 9 10 11

Terahertz backTerahertz front

135

90

95

100

105

110

115

120

125

130

The chart shows the thickness distribution from measurements at a certain height level. Turbine blade: Thickness measure-

ment of ceramic thermal barrier coating.

■■ Consultation – on technology and appli-

cation aspects■■ Initial tests – measurements in our appli-

cation lab■■ Feasibility studies – technically and eco-

nomically■■ Equipment rent – for limited-period tasks

■■ Contract measurement – for industry and

research■■ Development – from single components

to individual complete systems■■ Measurements on customer‘s site –with

mobile systems on any large objects

Our offer

■■ Detection of

· Inhomogeneities

· Cracks

· Inclusions

· Cavities and defects on the inside

of the specimen

■■ Measurement of green ceramics and

sintered ceramics■■ Thickness measurement of ceramic layers■■ Real-time measurements in coating

processes

Inspection of ceramics3 Ceramic layer on a steel

plate: Thickness fluctua-

tions can be measured.

Left: Specified measure-

ments determined with the

eddy current method

4 Thickness distribution

quantitatively displayed