综合研究性实验题A：基于傅里叶变换的频谱测量与应用  

Comprehensive test A:Frequency spectrum measurement and its application based on Fourier transform

作　　者：刘东奇 朱江[1,2] 李强[1,2] 刘丽飒[1,2] 姚江宏[1,2,3] 孔勇发[1,2,3] LIU Dong-qi;ZHU Jiang;LI Qiang;LIU Li-sa;YAO Jiang-hong;KONG Yong-fa(School of Physics,Nankai University,Tianjin 300071,China;National Demonstration Center for Experimental Physics Education,Nankai University,Tianjin 300071,China;TEDA Institute of Applied Physics,Nankai University,Tianjin 300071,China)

机构地区：[1]南开大学物理科学学院,天津300071 [2]南开大学基础物理国家级实验教学示范中心,天津300071 [3]南开大学泰达应用物理研究院,天津300071

出　　处：《物理实验》2019年第11期31-35,共5页Physics Experimentation

基　　金：教育部基础学科拔尖学生培养试验计划(No.20170111,20180302,20180802);国家基础科学人才培养基金项目(No.J1210027);南开大学物理基地能力提高项目(No.J1103208)

摘　　要：介绍了第5届全国大学生物理实验竞赛综合研究性实验题A的实验内容,并给出参考解答以及竞赛结果分析.综合研究性实验题A为基于傅里叶变换的频谱测量与应用.基于标量衍射理论,设计了傅里叶变换频谱测量实验,主要包含以坐标纸完成光栅常量的测定和成像透镜焦距的测量,以光强仪与示波器联用完成网格字条纹密度的测量和频谱缩放方法的展现.竞赛结果表明:考生对教学大纲中的基本实验内容掌握较好,但是综合使用常规的探测器和数据采集仪器还存在不足,自主设计和搭建实验装置完成综合性实验的能力欠缺.The experiment content,solution and result analysis of the comprehensive test A of the 5 th Chinese Undergraduate Physics Experiment Competition were given.The title of test A was“Frequency spectrum measurement and its application based on Fourier transform”.Comprehensive test A was designed based on scalar diffraction theory.The experiment included the measurement of grating constant and focal length of imaging lens on a coordinate paper,and the test of the fringe density of grid word and the frequency spectrum scaling by light intensity meter and oscilloscope.The competition results indicated that the examinee mastered the basic experimental content in the syllabus,but there were still shortcomings in the comprehensive application of conventional detectors and data acquisition instruments,and the ability to design and set up experimental devices independently.

关 键 词：傅里叶变换 频谱测量 频谱缩放 焦距 

分 类 号：O438.2[机械工程—光学工程]