Phase interrogation method can effectively avoid the operational spacing problems of fiber-optic Fabry-Perot (F-P)sensors. Based on the principles of F-P interference and low coherence interference, polarizers and birefringent crystals are applied to construct signals with quadrature relationship. A four-quadrant inverse tangent operation is employed to accurately calculate the phase values. We have performed rapid, high-speed measurements of dynamic pressure with aF-P sensor. Experimental results show that the method can achieve real-time pressure measurements up to 3 MPa with an interrogation rate of 5 kHz. This research holds much promise for the promotion of interferometric based fiber-optic sensors and applications of pressure measurements.
Indium tin oxide (In2O3-SnO2-90/10 wt%, ITO) is a semiconductor material with excellent electrical conductivity. In this paper, ITO was deposited on a multimode optical fiber by magnetron sputtering technique and characterized by using Scanning Electron Microscopy (SEM). It is subsequently used as a working electrode in a three-electrode system to study its electrochemical behavior in different solutions. In 0.1 M KCl containing such redox probes as 1 mMofK3[Fe(CN)6] were discussed by Cyclic voltammetry (CV) method at different scan rates. The observed electrochemical processes are quasi-reversible and diffusion-controlled. The results of the investigation inject new vitality to enhance the intersection of electrochemistry and optics disciplines, and also lay the foundation for dual-domain determination.
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