4 . a 8 - cascaded wavelength - division - multiplexed fiber bragg grating sensor system was interrogated by changing voltage acting on a employed tunable fabry - perot filter , and a feedback loop was introduced to make filter track the shifted wavelength of the sensor . at the same time an unbalanced scanning michelson interferometer was introduced to demodulate sensor signal 同时为克服查询某一光栅时，应变引起波长漂移导致反射波长偏离f - p透过波长，利用一反馈控制装置，使得滤波器的透过波长自动追踪查询光栅的布一拉格波长，利用非平衡扫描michelson干涉仪对传感信号进行了高分辨率的解调。
Lastly , according to correlation theoretics of advanced education and application theoretics of computer multimedia technology , the paper researched and empoldered college physical experiments " multimedia textbook . on the base of abundant investigation and practice in practical work , some research and development principles about multimedia textbook were concluded , and the basic frame of college physical experiments " multimedia textbook was constructed . and thereinto , five multimedia experiments such as measuring electrostatic field with simulation method , michelson interferometer , measuring the tensility of liquid surface , air cushion navigation experiment , and drawing lissajous figures were empoldered 最后，论文根据高等教育的相关理论和计算机多媒体技术的应用理论，开展了“大学物理实验”多媒体教材的研究与开发工作，并在大量调查研究和研发实践的基础上，归纳出多媒体教材的研发原则，构建起“大学物理实验”多媒体教材的基本框架，同时研发了“模拟法测静电场” 、 “迈克尔逊干涉仪” 、 “气垫导轨” 、 “液体表面张力的测定”以及“李萨如图形”等五个实验内容的多媒体教材。
