Acta Optica Sinica, Volume. 31, Issue S1, 100104(2011)
Experimental Study of Tip-Coating Fiber-Optic Humidity Sensor
A Fabry-Pérot fiber-optic humidity sensor with porous silicon film as sensitive element is proposed. The volume of liquid water in porous silicon film tends to dynamic equilibrium due to capillary effect. Water content in porous silicon film increases with the increase of the relative humidity, which results in the change of effective refractive index of porous silicon, and therefore shifts the reflected spectrum. Based on theoretical study, the experimental results demonstrate the feasibility of use of porous silicon thin film as humidity sensor. The characteristic wavelength shifts 9.6 nm as the relative humidity changes from 11% to 97%. By data fitting of the experimental results; the effective refractive index changes under different humidity conditions can be reckoned. A red-shift of interference spectrum fringe is monitored, which is consistent with the theoretical calculation.
Get Citation
Copy Citation Text
Li Xiaobing, Yang Minghong, Liao Zhaolong. Experimental Study of Tip-Coating Fiber-Optic Humidity Sensor[J]. Acta Optica Sinica, 2011, 31(S1): 100104
Category: Materials
Received: Aug. 8, 2010
Accepted: --
Published Online: Jan. 14, 2011
The Author Email: Xiaobing Li (lxb87@whut.edu.cn)