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HeNe
Laser
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Contast
Coherence Length
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Two
Beam Interference
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Homodyne
Interferometer
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Technical
Interferometer
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Fringe
Dedection, Count. & Interp.
-
Definition
of Length
-
Calibration
of mashines
- Download
PDF data sheet ...
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The
history of interferometers began in 1881 with a
set up created by A.A. Michelson which later results
in the definition of the basic meter in units of
light wave-lengths. This educational kit contains
in the basic version a Michelson interferometer
set up to teach the students in handling, alignment
and measurement of this basic interferometer system.
The basics like properties of Gaussian beams, wave
fronts and interference patterns are discussed.
The spectral emission bandwidth of the laser source
is introduced and the influence to the inter-ferometer
contrast is dicussed. The measurement of coherence
length of a HeNe laser shows the students additional
parameters of interferometry. The next step of
in interferometry can be done with the optional
extension to a technical interferometer where the
Michelson set-up is expanded with additional com-ponents
and optics and electronics to do real length measurements
(Option CA-1301). The given set-up corresponds
to the homodyne laser interferometer set up used
in industrial measurements. All necessary opti-cal
signals like +sin, -sin & +cos and -cos are
genera-ted, processed and measured (optional 100
MHz Oscilloscope). The detection of fringes including
coun-ting and direction recognition is shown. At
the third step the system is extended with a motori-zed
translation stage and a controller to reproduce
an common application of the industry, the calibration
of an unknown length with a known one (Option CA-1302).
Within this kit an unstabilized HeNe laser in combina-tion
with the technical interferometer above shows the
students how such a calibration measurement e.g.
for CNC machines is working and which parameters
must be observed. The influence of environment
will be discussed and calculated with the 'Edlen'
formula. The included software visualizes the results
on an optional IBM compatible PC.
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