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Fiber optical interferometers belong to highly sensitive equipments that are able to measure slight changes like distortion
of shape, temperature and electric field variation and etc. Their great advantage is that they are insensitive on ageing
component, from which they are composed of. It is in virtue of herewith, that there are evaluated no changes in optical
signal intensity but number interference fringes. To monitor the movement of persons, eventually to analyze the changes
in state of motion we developed method based on analysis the dynamic changes in interferometric pattern. We have used
Mach- Zehnder interferometer with conventional SM fibers excited with the DFB laser at wavelength of 1550 nm. It was
terminated with optical receiver containing InGaAs PIN photodiode. Its output was brought into measuring card module
that performs on FFT of the received interferometer signal. The signal rises with the composition of two waves passing
through single interferometer arm. The optical fiber SMF 28e in one arm is referential; the second one is positioned on
measuring slab at dimensions of 1x2m. A movement of persons around the slab was monitored, signal processed with
FFT and frequency spectra were evaluated. They rose owing to dynamic changes of interferometric pattern. The results
reflect that the individual subjects passing through slab embody characteristic frequency spectra, which are individual for
particular persons. The scope of measuring frequencies proceeded from zero to 10 kHz. It was also displayed in
experiments that the experimental subjects, who walked around the slab and at the same time they have had changed
their state of motion (knee joint fixation), embodied characteristic changes in their frequency spectra. At experiments the
stability of interferometric patterns was evaluated as from time aspects, so from the view of repeated identical
experiments. Two kinds of balls (tennis and ping-pong) were used to plot the repeatability measurements and the gained
spectra at repeated drops of balls were compared. Those stroked upon the same place and from the same elevation and
dispersion of the obtained frequency spectra was evaluated. These experiments were performed on the series of 20
repeated drops from highs of 0,5 and 1m. The evaluation of experiments displayed that the dispersion of measured
values is lower than 4%. Frequency response has been verified with the loudspeaker connected to signal generator and
amplifier. Various slabs have been measured and frequency ranges were compared for particular slab designs.
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