Zhang Jian, Tang Xiling, Dong Junhang, Wei Tao, Xiao Hai
Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA.
Opt Express. 2008 May 26;16(11):8317-23. doi: 10.1364/oe.16.008317.
This paper reports the development of a new zeolite thin film-coated long period fiber grating (LPFG) sensor for direct measurement of trace organic vapors. The sensor was fabricated by growing pure silica MFI-type zeolite thin film on the optical fiber grating by in situ hydrothermal crystallization. The sensor measures chemical vapor concentration by monitoring the molecular adsorption-induced shift of LPFG resonant wavelength (lambda(R)) in near infrared (IR) region. Upon loading analyte molecules, the zeolite's refractive index changes in the close vicinity of the fiber index where the LPFG has a large response to achieve high sensitivity.
本文报道了一种新型的沸石薄膜包覆长周期光纤光栅（LPFG）传感器的研制，用于直接测量痕量有机蒸汽。该传感器是通过原位水热结晶法在光纤光栅上生长纯硅MFI型沸石薄膜制成的。该传感器通过监测长周期光纤光栅在近红外（IR）区域的共振波长（λ(R)）因分子吸附引起的位移来测量化学蒸汽浓度。当加载分析物分子时，沸石的折射率在光纤折射率附近发生变化，而长周期光纤光栅对此处有较大响应，从而实现高灵敏度。
