Physics – Optics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..899..689y&link_type=abstract
SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP Conference Proceedings, Volume 899, pp. 689-689 (2007).
Physics
Optics
Interferometers, Optical Elements, Devices, And Systems, Fiber Optics
Scientific paper
Optic tables may be an obstacle for the interferometric studies when they are exposed to mechanical vibrations in the particular frequency range. To reduce the mechanical noise, a moveable mirror of the FTIR spectrometer was used as an interferometer mirror. The vibration response of this mirror was investigated with a fiber optic Fabry-Perot interferometer that was built in our laboratory. The moveable mirror is mounted on a coil that is located between the permanent magnets. When the proper current is applied to the coil, the mirror becomes magnetically suspended and resistant to the mechanical vibrations. This work presents a non-contact vibration-monitoring technique with the extrinsic Fabry-Perot interferometric displacement sensor implemented using 4/125 μm single-mode fiber with 3 dB fiber optic coupler. This device is based on a low finesse Fabry-Perot cavity which is formed by the end of a sensing optical fiber (fiber probe) and the magnetically-suspended mirror. The incoming light is emitted by a 660 nm laser diode. During the vibration test an ADC (NI 6070E) and a Labview software program were used. This technique helps to reduce the mechanical noise and to improve the stability of the interferometer.
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