用于嵌入式复合结构应变测量的芯内光纤布拉格光栅

Intracore fiber bragg gratings for strain measurement in embedded composite structures.

作者信息

Murukeshan V M, Chan P Y, Ong L S, Asundi A

出版信息

Appl Opt. 2001 Jan 1;40(1):145-9. doi: 10.1364/ao.40.000145.

DOI:10.1364/ao.40.000145

Abstract

An intracore Bragg grating written on a photosensitive fiber core is used for strain measurement in composite specimens under load. The strain information is directly related to the absolute change in the Bragg-reflected wavelength. Fiber Bragg grating (FBG) sensors (fibers with intracore gratings) are thus sensitive to strain that is caused by changes in temperature as well as to load-induced changes. Thus these sensors can be made to be independent of source intensity variations and losses. FBG sensors used for load-induced strain sensing in composite structures and the effects of temperature on them are discussed. A detailed account of the use of such embedded structures as self-monitoring nondestructive testing devices is given.

摘要

写在光敏光纤纤芯上的纤芯内布拉格光栅用于测量复合材料试件在载荷作用下的应变。应变信息与布拉格反射波长的绝对变化直接相关。因此，光纤布拉格光栅（FBG）传感器（带有纤芯内光栅的光纤）对温度变化引起的应变以及载荷引起的变化都很敏感。这样，这些传感器可以做到不受光源强度变化和损耗的影响。讨论了用于复合结构中载荷引起的应变传感的FBG传感器及其温度效应。详细介绍了将这种嵌入式结构用作自监测无损检测装置的情况。