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

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 t...

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Bibliographic Details
Published in:Review of scientific instruments 2016-07, Vol.87 (7), p.073104-073104
Main Authors: Zhou, Jianqin, Shen, Jun, Neill, W. Stuart
Format: Article
Language:English
Subjects:
Chemical reactions
Ethanol
Fast Fourier transformations
Fourier transforms
Interferometry
Low pass filters
Organic chemistry
Refractivity
Scientific apparatus & instruments
Temperature
Temperature dependence
Thermophysical properties
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Summary: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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4958820