Optical fiber sensors measurement system and special fibers improvement
2017
We present method for the improvement of the measurement accuracy in the optical frequency spectra
measurements based on tunable optical filters. The optical filter was used during the design and realization of the
measurement system for the inspection of the fiber Bragg gratings. The system incorporates a reference block for the
compensation of environmental influences, an interferometric verification subsystem and a PC - based control software
implemented in LabView. The preliminary experimental verification of the measurement principle and the measurement
system functionality were carried out on a testing rig with a specially prepared concrete console in the UJV Řež. The
presented system is the laboratory version of the special nuclear power plant containment shape deformation
measurement system which was installed in the power plant Temelin during last year.
On the base of this research we started with preparation other optical fiber sensors to nuclear power plants
measurement. These sensors will be based on the microstructured and polarization maintaining optical fibers. We started
with development of new methods and techniques of the splicing and shaping optical fibers. We are able to made optical
tapers from ultra-short called adiabatic with length around 400 um up to long tapers with length up to 6 millimeters.
We developed new techniques of splicing standard Single Mode (SM) and Multimode (MM) optical fibers and
splicing of optical fibers with different diameters in the wavelength range from 532 to 1550 nm. Together with
development these techniques we prepared other techniques to splicing and shaping special optical fibers like as
Polarization-Maintaining (PM) or hollow core Photonic Crystal Fiber (PCF) and theirs cross splicing methods with focus
to minimalize backreflection and attenuation. The splicing special optical fibers especially PCF fibers with standard
telecommunication and other SM fibers can be done by our developed techniques. Adjustment of the splicing process has
to be prepared for any new optical fibers and new fibers combinations. The splicing of the same types of fibers from
different manufacturers can be adjusted by several tested changes in the splicing process. We are able to splice PCF with
standard telecommunication fiber with attenuation up to 2 dB. The method is also presented.
Development of these new techniques and methods of the optical fibers splicing are made with respect to using
these fibers to another research and development in the field of optical fibers sensors, laser frequency stabilization and
laser interferometry based on optical fibers. Especially for the field of laser frequency stabilization we developed and
present new techniques to closing microstructured fibers with gases inside.
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