HIGH-FREQUENCY INTERROGATION DEVICE FOR FPI-BASED FIBER SENSORS
M.P. Gaskov, V.A. Simonov, V.S. Terentyev, I.A. Lobach
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: interrogator, FPI-based sensor, phase algorithm, arrayed waveguide grating
Abstract
The paper describes the operation of a device for interrogating fiber sensors based on a Fabry-Perot interferometer (FPI) with a frame update rate of up to 70 kHz. The high performance is achieved due to the combination of a passive optical scheme based on a multichannel arrayed waveguide grating (AWG) and a phase algorithm for data processing. The possibility of high-rate interrogation of the sensor with accuracy of ~ 1% (~50 pm) of the measurement range is experimentally demonstrated.
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