A double-cladding fiber curvature sensor based on the extrinsic Fabry-Perot interferometer

Based on the principle of Fabry-Perot (F-P) interference, a new type of optical fiber curvature sensor is presented, which is fabricated by single-mode fiber (SMF), ceramic tube and double-cladding fiber (DCF). And the curvature sensing properties are analyzed, and the double-peak method is used to demodulate the cavity length. The experimental results show that the F-P interference spectrum shifts toward long wavelengths with increasing the curvature. And the sensors are placed in different positions on the cantilever to get their different curvature sensitivities. Smaller initial cavity length gives greater sensor sensitivity. The best curvature sensitivity is achieved as 2 554.53 pm/m-1 in 0.71—1.18 m-1. By demodulating the length of the F-P cavity, the cavity length of sensor 4 is changed by 0.08 mm. Therefore, the sensor has some potential for measure the small displacement.     

嵌入式舞台控制系统远程监控的研究与设计

本文采用一种新的嵌入式系统RCM2100对舞台控制进行设计的一种方案。与其他舞台控制系统相比,该系统实时性好,并且可以基于TCP/IP协议通过Internet网络(或以太网)传输控制数据,实现对系统的远程监控与维护,带来了很大的方便。