公开(公告)号：US06417507B1

公开(公告)日：2002-07-09

申请号：US09460715

申请日：1999-12-14

申请人： Alan Malvern ,  Thomas Allsop ,  Ronald Neal

发明人： Alan Malvern ,  Thomas Allsop ,  Ronald Neal

IPC分类号： G01J142

CPC分类号： G01L1/246 ,  G01D5/35316

摘要： A modulated fibre Bragg grating strain gauge assembly for absolute gauging of strain including at least one sensor element (1) in the form of a length of optical fibre containing, along part its length, means for partially reflecting light (1a), means for generating and passing a beam of light (2a) with a spectral feature less than 0.1 nanometers in width into the at least one sensor element (1) where reflection takes place, which reflection is a substantially sinusoidal intensity variation in wavelength over a range of from 2 to 3 nanometers comprising at least two substantially sinusoidal periods such that as the at least one sensor element sustains a change in length resulting from a strain thereon, the reflected intensity varies substantially sinusoidally along the at least two sinusoidal periods, means for receiving and processing the reflected light (2b) to establish the light intensity values at one (1f) and two times (2f) a modulation frequency (1f) applied to the means for generating the beam of light (2a), and means to determine an absolute direction and magnitude of strain from a ratio of the intensity values 1f:2f.

摘要翻译： 一种用于绝对测量应变的调制光纤布拉格光栅应变计组件，包括至少一根光纤长度的传感器元件（1），其长度部分包含用于部分反射光（1a）的装置，用于产生 以及将具有小于0.1纳米宽度的光谱特征的光束（2a）传送到发生反射的至少一个传感器元件（1）中，该反射是在2范围内的波长上的基本正弦波强度变化 包括至少两个基本上正弦的周期，使得当至少一个传感器元件维持由其上的应变导致的长度变化时，反射强度沿着至少两个正弦周期基本上正弦地变化，用于接收和处理 反射光（2b），以在第一（1f）和二次（2f）处建立应用于基因装置的调制频率（1f）的光强度值 消除光束（2a），以及从强度值1f：2f的比率确定应变的绝对方向和大小的装置。