title: Frequency analysis of temperature-dependent interferometric signal for the measurement of the temperature coefficient of refractive index.
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.
authors.affiliation: Energy, Mining and Environment Portfolio, National Research Council of Canada, 4250 Wesbrook Mall, Vancouver, British Columbia V6T 1W5, Canada.
authors.forename: Jianqin
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Energy, Mining and Environment Portfolio, National Research Council of Canada, 4250 Wesbrook Mall, Vancouver, British Columbia V6T 1W5, Canada.
authors.forename: Jun
authors.initials: J
authors.lastname: Shen
authors.affiliation: Energy, Mining and Environment Portfolio, National Research Council of Canada, 1200 Montreal Rd., Ottawa, Ontario K1A 0R6, Canada.
authors.forename: W Stuart
authors.initials: WS
authors.lastname: Neill