中国科技论文在线

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2011年06月20日

【期刊论文】Distributed optical fiber bi-directional strain sensor for gas trunk pipelines

刘铁根， Chuan Li *， Yi-mo Zhang， Tie-gen Liu， Xin Li， Xi-ming Cheng

Optics and Lasers in Engineering 36 (2001) 41-47，-0001，（）：

-1年11月30日

In this paper, we designed an optical fiber bidirectional strain gauge bonded on each single detecting point. Based on detecting single point ofmarkedly different value from the remainder ofthe fiber, the loss-modulation approach is appropriately applied to monitoring the strain=deflection ofpipelines in OTDR. It is worth noting that the distortion of pipelines can be measured partly by detecting the strain at the joint suitable to monitor gas trunk pipelines. The key technology for measuring both tensile strain and compressive strain is the pretreatment ofbending the optical fibers on the two pairs of bending points, which can be identified by optical time domain reflectometer (OTDR) ifinserting time delay optical fiber.

Optical fiber bidirectional strain gauge， Optical time domain reflectometer (， OTDR)，， Fiber bending loss， Tensile strain， Compressive strain

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2011年06月20日

【期刊论文】An effective method of ensuring the uniformity of laser intensity in a larger expanded angle

刘铁根， T.G. LIU， Y.J. LIN

Optics & Laser Technology, Vol. 29, No.5, p. 291, 1997，-0001，（）：

-1年11月30日

摘要

Generally it is difficult to ensure the uniformity of laser intensity in a larger expanded angle. This note describes a simple method to solve this problem.

large apertures,， shadow optical system,， uniformity.，

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2011年06月20日

【期刊论文】Photoelectric automatic focusing system based on interference

刘铁根， T.G. Liu *， H.Y. Cai， F.L. Zhang， R.A. Lessard， Y.M. Zhang

Optics and Lasers in Engineering 36 (2001) 345-353，-0001，（）：

-1年11月30日

摘要

The principle and the method of a new automatic focusing system are presented in this paper. The system is constructed relying on the relationship between laser wave interference patterns and defocusing displacement. ACCD linear arrayreceives interference patterns in the form of light intensity, which are converted into digital signals afterwards. Then the computer controls a stepping motor to complete auto-focusing process according to the digital results. The system has been applied in a kind of film resolution testing instrument and it shows that it has the advantage of high accuracy, high speed and wide applications.

Automatic focusing， Data sampling， Laser interference

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2011年06月20日

【期刊论文】DWDM系统的零色散光纤光栅滤波器设计**

刘铁根，刘铁根**，江俊峰，张以谟，孙杰，李川

光电子·激光：2004，15（1）：49～52，-0001，（）：

-1年11月30日

摘要

光纤光栅（FBG）的耦合模演化方程经过简单变换转化成Zakharov Shabat系统，该系统的位势参数q（z）与FBG折射率调制函数neff（z）成正比关系，从而对特定的散射量利用逆散射理论中的Gel fand Levitan Mar chenko（GLM）积分方程求得neff（z）。进而设计了50GHz零色散FBG方形滤波器，随后将得到的neff（z）代入耦合模演化方程进行正向求解。计算结果表明，设计的FBG滤波器在所要求的反射谱具有恒定的群时延，同时也具有较好的幅度响应，相邻通道之间的串扰可小于-20dB。

逆散射，耦合模方程，光纤光栅(， FBG)，滤波器，色散