Zhou Jianqin, Shen Jun, Neill W Stuart
Energy, Mining and Environment Portfolio, National Research Council of Canada, 4250 Wesbrook Mall, Vancouver, British Columbia V6T 1W5, Canada.
Energy, Mining and Environment Portfolio, National Research Council of Canada, 1200 Montreal Rd., Ottawa, Ontario K1A 0R6, Canada.
Rev Sci Instrum. 2016 Jul;87(7):073104. doi: 10.1063/1.4958820.
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.
开发了一种使用法布里-珀罗干涉仪测量折射率温度系数（dn/dT）的频率分析方法，并针对乙醇和水进行了测试。对由艾里公式描述的与温度相关的干涉信号在温度域和频率域进行了分析。通过快速傅里叶变换，设计并采用了一个低通滤波器来消除叠加在信号上的噪声。通过峰值分析从去除噪声后的信号中准确确定dn/dT。此外，信号频率参数可用于材料热物理性质表征。该方法为监测化学过程的在线dn/dT仪器奠定了基础。
