Fiber ring resonator using a cavity ring‐down interrogation technique for curvature sensing

Abstract

In this work, it is demonstrated a fiber ring resonator connected to an interrogation system usually implemented on a cavity ring‐down technique. A long‐period grating (LPG) was inserted in the resonant cavity, being operated as a curvature sensor. The experimental results demonstrate that using this setup, different sensitivities can be achieved in terms of analyzing decay time over the radius of the curvature and over curvature. The LPG sensor presented higher sensitivity with larger radius of curvature, namely 6.91 μs/m. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:267–270, 2016

Real-time processing system for cavity ring down signal based on ZYNQ chip

“…It is very meaningful when applied to the cavity ring-down spectroscopy to detect trace gases, and can more accurately reflect the change of the measured gas concentration in the ring-down cavity [12,13,14,15,16]. In the measurement of the resonant cavity loss, the resonant cavity can be adjusted in real-time, which can reduce the loss of the resonant cavity and improve the yield and excellent rate of the resonant cavity efficiently [17,18,19]. The traditional measurement system consists of a DAC(Data Acquisition Card) and a computer which obviously has the disadvantages of large size, complex operation, and poor scalability.…”

Analysis of signal saturation in a fiber ring resonator integrating an intensity sensor

“…The incorporation of ring resonators is very wide, particularly in the sensors field [1][2][3]. The implementation of conventional interrogation systems, such as Optical Time Domain Reflectometers (OTDRs) in particular, allows the user to interrogate ring resonators in reflection [4][5]. Other techniques also integrate OTDRs in their interrogation systems, such as Cavity ring-down ones [6].…”