The contents of this volume reflect to a large extent the efforts made
by a group of Institutes at the ETH Zürich to develop new techniques for
measurements of flows in fluids in the last decade. The motivation came
from the study of tr sport and mixing processes in natural and
industrial systems. One of the characteristic properties of turbulence
is its high mixing efficiency. The techniques developed are therefore
suitable, although not exclusively, for turbulence measurements. They
can be subdivided into point-measurements and field-measurements. The
aim of the point-measurements developed is to determine the three
components of the velocity and all their first derivatives with good
temporal resolution and accuracy in turbulent flows. The old and weIl
established method of hot-wire anemometry was used for this purpose. One
of the main achievements in this context is the construction of
miniature multi-wire probes. This technique was introduced to the
Institute of Hydromechanics and Water Resources Management of ETH Zürich
by Profs. A. Tsinober and E. Kit from Tel-Aviv University. This was made
possible by the generous financial support by ETH, for which I would
like to express my gratitude on this occasion. In addition, Dr. F.E.
Joergensen from DANTEC contributed an example of recent developments in
the hardware ofConstant Temperature Anemometry (CTA), for which I am
very thankful.
