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A method of frequency analysis for the measurement of the temperature coefficient of refractive index (dn/dT) using a Fabry\u2013Perot interferometer was developed and tested against ethanol and water. The temperature-dependent interferometric signal described by Airy\u2019s 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.Peer reviewed: YesNRC publication: Ye

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