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 OPTICAL FIBER SENSING
(Fabry Pérot method)
 Manufactured by ROCTEST Ltd. Canada

Measuring principle of Fabry Pérot method

Light from a light source that passes though optical fiber is repeatedly reflected between two half reflectors that form the detector part to generate Fabry Perot interference waves. These interference waves pass through the optical fiber, return to the conversion section, are again interfered with by the Fizeau interferometer set inside the conversion section, and the signal is transformed into electrical signals by linear photo diodes. At this time, the peak value is taken, converted into physical volume, and outputted. Since the space between the half reflectors in the detector section and the space of the Fizeau interferometer inside the conversion section is 1 to 1, the change in space at the time of detection of physical change in the detector section is reflected in the Fizeau interferometer and the interference wave peak value shifts.


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