Method for the interrogation of FBG thermo-hygrometer through full analog circuit

Vincenzo Romano Marrazzo; Francesco Fienga; Alfredo Zenga; Michele Riccio; Salvatore Buontempo; Andrea Irace; Giovanni Breglio

doi:10.1117/12.2678305

23 May 2023 Method for the interrogation of FBG thermo-hygrometer through full analog circuit

Vincenzo Romano Marrazzo, Francesco Fienga, Alfredo Zenga, Michele Riccio, Salvatore Buontempo, Andrea Irace, Giovanni Breglio

Author Affiliations +

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 1264332 (2023) https://doi.org/10.1117/12.2678305
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

The proposed work has the aim to investigate a full analog electrical circuitry to convert the wavelength-encoded signal coming from a pair of Fiber Bragg Grating (FBG) sensors into a single monotonic electrical signal. The latter can be used either to be read from a PLC system (or directly by a switch) if a 4-20 mA signal is needed (e.g. for safety application) or to have an instantly conversion without employing the classical interrogation system with a post-processing by means of a digital unit. Since its peculiarities (robust, reliable and completely free from any digital processing section) the proposed system has the aim to overcome the classical interrogator, with the aim to pave the way to a wider employment of FGB sensor in that environment where the reliability given by the interrogator based on multiple digital processing unit, handled by an operative system, may be subjected to failure. In the proposed manuscript, the system was studied analytically and numerically, taking advantage of its characteristic to behaves linearly in a range of 200pm Bragg wavelength shifting, due to the Arrayed Waveguide Grating (AWG) device, used as optical filter. As results, the capability to perform compensated measurement, by means of 2 FBG subjected to different physical quantities, was investigated. The obtained formula comprises FBGs linear coefficient in function of the physical phenomenon to measure and the system output.

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Vincenzo Romano Marrazzo, Francesco Fienga, Alfredo Zenga, Michele Riccio, Salvatore Buontempo, Andrea Irace, and Giovanni Breglio "Method for the interrogation of FBG thermo-hygrometer through full analog circuit", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 1264332 (23 May 2023); https://doi.org/10.1117/12.2678305

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KEYWORDS

Fiber Bragg gratings

Arrayed waveguide gratings

Sensors

Bragg wavelengths

Humidity

Temperature metrology

Analog electronics

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