Abstract

KHOMENKO, A.V.; TAPIA-MERCADO, J.  and  GARCIA-ZARATE, M.A.. Fiber optic sensing of relative humidity using a twin low coherence interferometer. Rev. mex. fis. [online]. 2010, vol.56, n.3, pp.208-210. ISSN 0035-001X.

A fiber-optic implementation of psychrometer is reported. It consists of two Sagnac interferometers with twisted highly birefringent fiber that is used as a temperature sensitive element. One interferometer is used for dry-bulb temperature measurement and the other is for wet-bulb temperature monitoring. The interrogation technique for low coherence interferometric sensor with signal processing in spectral domain is described. The measurement uncertainties for temperature and relative humidity measurements no worse than 0.01°C and 4%, respectively, have been achieved experimentally.

Keywords : Fiber-optics sensors; sagnac interferometer; low-coherence interferometry; birefringent fiber; relative humidity.

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