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type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_192030"> <P>光纤监测技术是国际上七十年代后期才迅速发展起来的一种现代化监测技术，在航空、航天领域中已<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>了其有效性。在土木、交通、地质工程领域的应用才刚刚开始，并受到了各发达国家研究机构的普遍重视，发展前景十分良好。 <P></P></P> <P >??本项目选择国际尖端监测技术布里渊散射光时域光纤网监测技术 (BOTDR)作为重点研究。它是利用了光纤的背向布里渊散射频率对光纤所受应力、应变和温度十分敏感，而且有较好线性关系的特性，对被测建筑物进行分布式实时监控。由于背向布里渊散射光的灵敏性，因而它的<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>精度很高，应变的测量精度可达10 <V:SHAPETYPE><V:STROKE joinstyle="miter"></V:STROKE><V:FORMULAS><V:F eqn="if lineDrawn pixelLineWidth 0"></V:F><V:F eqn="sum @0 1 0"></V:F><V:F eqn="sum 0 0 @1"></V:F><V:F eqn="prod @2 1 2"></V:F><V:F eqn="prod @3 21600 pixelWidth"></V:F><V:F eqn="prod @3 21600 pixelHeight"></V:F><V:F eqn="sum @0 0 1"></V:F><V:F eqn="prod @6 1 2"></V:F><V:F eqn="prod @7 21600 pixelWidth"></V:F><V:F eqn="sum @8 21600 0"></V:F><V:F eqn="prod @7 21600 pixelHeight"></V:F><V:F eqn="sum @10 21600 0"></V:F></V:FORMULAS><V<img src="static/image/smiley/default/tongue.gif" smilieid="7" border="0" alt="" />ATH connecttype="rect" gradientshapeok="t" extrusionok="f"></V<img src="static/image/smiley/default/tongue.gif" smilieid="7" border="0" alt="" />ATH><LOCK aspectratio="t" v:ext="edit"></LOCK></V:SHAPETYPE><V:SHAPE><V:IMAGEDATA></V:IMAGEDATA></V:SHAPE><IMG src="http://www.nju.edu.cn/cps/site/dhjgy/images/botdr.1.gif"> 数量级；与传统的监测技术相比，其特点主要有分布式、长距离、高精度、耐久性好等；与通常采用的光纤<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">传感</a>技术相比，其突出的优点在于它不需对光纤进行<a href="http://optics.oecr.com" target="_blank" class="relatedlink">加工</a>，传输与传感于一体，<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>费用低，不需要像光栅检测技术那样需对光栅作特别保护，它只需对光纤沿线返回的布里渊散射光信号进行专门处理即可，可长距离分布式测量。 <IMG src="http://www.nju.edu.cn/cps/site/dhjgy/images/botdr.2.jpg"></P> <P >??在多方支持下，研究所特别购进了日本NTT公司生产的AQ8602光纤应变/损失分析仪，将在光纤网监测和遥感远程测试系统的建立，特种光纤传感器的研制，光纤线路埋设方法，测试装置开发，工程学光纤测试原理的解析等方面进行开拓性研究。以期利用这一国际上十分尖端的高新技术创建大型工程设施建设及防灾的新型监测技术，为后继进一步将这一技术引入我国并投入使用，做好技术准备。<P> </P><P></P></P> <P> <V:SHAPETYPE><V:STROKE joinstyle="miter"></V:STROKE><V:FORMULAS><V:F eqn="if lineDrawn pixelLineWidth 0"></V:F><V:F eqn="sum @0 1 0"></V:F><V:F eqn="sum 0 0 @1"></V:F><V:F eqn="prod @2 1 2"></V:F><V:F eqn="prod @3 21600 pixelWidth"></V:F><V:F eqn="prod @3 21600 pixelHeight"></V:F><V:F eqn="sum @0 0 1"></V:F><V:F eqn="prod @6 1 2"></V:F><V:F eqn="prod @7 21600 pixelWidth"></V:F><V:F eqn="sum @8 21600 0"></V:F><V:F eqn="prod @7 21600 pixelHeight"></V:F><V:F eqn="sum @10 21600 0"></V:F></V:FORMULAS><V<img src="static/image/smiley/default/tongue.gif" smilieid="7" border="0" alt="" />ATH connecttype="rect" gradientshapeok="t" extrusionok="f"></V<img src="static/image/smiley/default/tongue.gif" smilieid="7" border="0" alt="" />ATH><LOCK aspectratio="t" 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