Frequency analysis of temperature-dependent interferometric signal for the measurement of the temperature coefficient of refractive index

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DOIResolve DOI: https://doi.org/10.1063/1.4958820
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Name affiliation
  1. National Research Council of Canada. Energy, Mining and Environment
FormatText, Article
Journal titleReview of Scientific Instruments
ISSN0034-6748
1089-7623
Volume87
Issue7
Article number073104
Subjecttemperature coefficient of refractive index; peak analysis; frequency analysis; noise reduction
Abstract
A method of frequency analysis for the measurement of the temperature coefficient of refractive index (dn/dT) using a Fabry–Perot interferometer was developed and tested against ethanol and water. The temperature-dependent interferometric signal described by Airy’s formula was analyzed in both the temperature and frequency domains. By fast Fourier transform, a low-pass filter was designed and employed to eliminate the noise superimposed on the signal. dn/dT was determined accurately from the noise-removed signal by peak analysis. Furthermore, the signal frequency parameters may be utilized for the material thermophysical property characterization. This method lays the foundation for an online dn/dT instrument for monitoring chemical processes.
Publication date
LanguageEnglish
Peer reviewedYes
NRC numberNRC-EME_55777
NPARC number23001053
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