Tilt sensor based on intermodal photonic crystal fiber interferometer

Abstract

A tilt sensor based on an intermodal photonic crystal fiber (PCF) interferometer is demonstrated. The sensor consists of a tubular filled with NaCl aqueous solutions and an intermodal PCF interferometer, which is formed by using a short PCF with two single-mode fibers (SMFs) spliced at both ends, and the air-holes in the splice regions are fully collapsed. The intermodal PCF interferometer is fixed in a rigid glass tubular with a slant orientation, and a half of the PCF is immersed in the NaCl aqueous solutions, while the other half is exposed in air. When tilting the tubular, the length of the PCF immersed changes so that the transmission spectrum moves. Therefore, by monitoring the wavelength shift, the tilt angle can be achieved. In the experiment, a 0.8-cm-length intermodal PCF interferometer was adopted. The sensitivity of the proposed sensor was obtained from -1.5461 nm/° to -30.1244 nm/° when measuring from -35.1° to 37.05°.

An Omni-Azimuth Angle Sensor for Tilt Measuring Based on FBG Array

“…Optical fiber angle sensor [16]- [19] not only has the unique advantages of optical fiber sensor [20]- [22], such as against electromagnetic interference, but also has the measurement accuracy and sensitivity no lower than the first two [23]- [24]. For example, Xiaotong Zhang et al [25] proposed an angle sensor based on the multi-mode photonic crystal fiber interference principle. A multi-mode photonic crystal fiber was fused between two single-mode fibers and placed in a glass tube containing NaCl solution.…”