Summarizing the development statement of monitoring technology for bridge , based on principle of pulse laser ranger detection and fiber - optic strain measurement , in view of the problem affected by single - chip inherent feature , integrating the goodness of cpld device and single - chip , using a / d converter to measure the count quantization error , a strain measurement system is worked out . the above system chiefly consists of light source , optic fiber sensor , photo detector and signal processing circuit 本文综述了国内外桥梁监测技术的发展概况，在深入研究脉冲激光测距和光纤应变测试原理的基础上，针对单片机固有计数频率低、计数量化误差大和延时不固定等不足，结合cpld计数频率高、延时小而固定和单片机控制功能强的优势，并采用模数转换技术设计计数量化误差测量电路，提出了基于激光脉冲时间测量法的光纤应变测量的方案。
Thirdly , features about the output interface method of strain gauge have also been discussed . after discussing the principle of dsp system , the feature and structure of dsp pin and the software development environment like cc , the whole structure of one new strain gauge integrated with dsp was proposed , and the key problems of realizing this gauge were discussed 通过分析现有光纤应变测量仪的输出接口特点与方式，在论述了dsp系统的原理、特点、基本框架以及dsp软件开发环境的基础上提出了基于dsp的一体化光纤法珀应变测量仪的实现思路及关键问题。
