Fiber Optic Interrogation Systems for Hypervelocity and Low Velocity Impact Studies  

作　　者：D. A. JACKSON M. J. COLE 

机构地区：[1]Applied Optics Group, School of Physical Sciences, University of Kent, Canterbury, Kent, CT2 7NH, UK.

出　　处：《Photonic Sensors》2012年第1期50-59,共10页光子传感器（英文版）

摘　　要：The aim of this project was to develop non-contact fiber optic based displacement sensors to operate in the harsh environment of a ＂light gas gun＂ （LGG）, which can ＂fire＂ small particles at velocities ranging from 1 km/s-8.4km/s. The LGG is used extensively for research in aerospace to analyze the effects of high speed impacts on materials. Ideally the measurement should be made close to the center of the impact to minimize corruption of the data from edge effects and survive the impact. We chose to develop a non-contact ＂pseudo＂ confocal intensity sensor, which demonstrated resolution comparable with conventional polyvinylidene fluoride （PVDF） sensors combined with high survivability and low cost. A second sensor was developed based on ＂fiber Bragg gratings＂ （FBG） to enable a more detailed analysis of the effects of the impact, although requiring contact with the target the low weight and very small contact area of the FBG had minimal effect on the dynamics of the target. The FBG was mounted either on the surface of the target or tangentially between a fixed location. The output signals from the FBG were interrogated in time by a new method. Measurements were made on carbon fiber composite plates in the LGG and on low velocity impact tests. The particle momentum for the low velocity impact tests was chosen to be similar to that of the particles used in the LGG.

关 键 词：Intensity sensor FBG hypervelocity impacts composite high speed processing 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业] TP212[自动化与计算机技术—检测技术与自动化装置]