Department of Physics annual report 2000 - Fysiikan laitos - Helsinki.fi

mospheric particle formation, growth
have had close collaboration especially
ics and electronics combined. An in-
and hygroscopic properties.
with the Department of Forest Ecology
frared imaging system for the Techni-
The main output of our experimen-
and the Department of Chemistry, both
cal Research Centre of Finland (VTT)
tal laboratory work has been the devel-
in the University of Helsinki, and with
was completed and delivered as part of
opment of tools for investigating nuclea-
the Air Quality Department of the
an EU project which VTT is adminis-
tion phenomena and cloud condensa-
Finnish Meteorological Institute.
trating. With the IR camera system
tion nucleus activation. We have also
The international postgraduate
developed in our laboratory an infrared
carried out measurements of aerosol
training programme for aerosol and
image of wooden planks can be ob-
particle size distributions in a variety of
environmental physics (started at the
tained on-line from a moving conveyer.
laboratory systems as well as in atmos-
beginning of the autumn semester
On-line quality control of wooden
pheric conditions. Our special interest
1994) was continued during 2000.
planks has become more and more
has been targeted on the nanometer size
Financial support from the Acade-
important as better surface finish is
range using recently developed aerosol
my of Finland, the Environment and
demanded.
instrumentation such as electrical mo-
Climate Research Programme (The
We have completed the design of a
bility spectrometry and the diffusion
European Commission), the Nessling
prototype coherence microscope. The
battery technique, whereas for micron-
Foundation and Tekes is gratefully
coherence microscope utilizes the so-
sized particles optical counting of parti-
acknowledged.
called white-light interference phe-
cles is typically used.
nomenon. With the table-top prototype
8
International cooperation has had
a significant role in both the theoretical
and the experimental activities of
the group. During 2000 various projects
(including five EU projects) continued
▼ Electronics and Industrial
Physics Research Laboratory
(www.physics.helsinki.fi/~etlab/)
M a u r i L u u k k a l a
we can take high-resolution surface
profile microscopy pictures of various
samples such as micromechanical
parts, milled surfaces and even biological
samples, as the microscope can be
in cooperation with research groups
In our laboratory we continue develop-
scaled for different resolutions. The
from Austria, Canada, the Czech Re-
ing various novel measurement meth-
illumination for the coherence micro-
public, Estonia, Germany, Ireland,
ods and sensors using optics, ultrason-
scope can be created either with a
Italy, Japan, the Netherlands, Russia,
Sweden, the United Kingdom and the
United States. On the national level we
3D presentation of a profile of a wafer
sensor measured using white-light
interferometer