频率测量新原理的研究

电子机电论文编号:JD594 论文字数:35473,页数:61
频率测量新原理的研究
目  录
摘要 I
Abstract II
第1章  绪论 1
1.1 频率及其测量的重要性 1
1.2 现阶段频率测量的常用方法 1
1.3 频率测量的发展 2
第2章  常用频率测量方法的研究 5
2.1 直读测频法 5
2.1.1 电桥法测频 5
2.1.2 谐振法测频 6
2.2 波形推算法 6
2.3 多周期同步法 9
2.4 常用高精度测频方法 11
2.4.1 高精度定闸门测频方法 11
2.4.2 模拟内插法 16
2.4.3 游标法 18
2.5 频率标准的测量方法 20
2.5.1 频率误差倍增法 20
2.5.2 频差倍增—多周期法 21
第3章  基于相位差的高精度测频原理的研究 23
3.1 一般意义上的相位测频法的研究 23
3.2 具有倍数关系的相位差法测高频的原理 28
3.3 具有大倍数比的频率测量的实验验证 32
第4章  光频测量新方法的探索和研究 34
4.1 概述 34
4.2 光的基本原理的认识 35
4.2.1 单色性 35
4.2.2 方向性 36
4.2.3 高亮度 36
4.2.4 相干性 36
4.3 传统的光频测量方法 36
4.3.1 光的混频链测频法 37
4.3.2 基于锁模飞秒脉冲激光技术的光频测量方法 41
4.4 相位差法在光频测量中的研究和探讨 43
结束语 50
致 谢 51
参考文献 52
附 录 53

摘要：本课题是目前科学技术发展的需要，在对以往频率测量的研究基础上，提出了一种高精度的频率测量方法，这与以往的频率测量方法有很大的不同，具有简单、易行、精度高的特点。该频率测量方法是利用互成倍数的频率信号周期间的相对关系，对频率的直接测量，转化为能够反映频率信息的相位关系的测量，将频率的快速变化转化为相位之间相对的非常缓慢的变化，根据两频率源间相位差的变化，来反映两频率源间的平均频率偏差。通过大量的实验证明了针对射频到微波，甚至更高的频率之间，存在大频率差异的情况下，完全可以采用相位比对的方法，基于相对低的频率信号实现比其大105以上的较高频率的频率测量。这种利用相位关系直接比对测频是探索光频等超高频率准确测量的一种重要的新方法。
关键词: 频率测量；相位比对；相位差；频率差

Frequency measurement new principle research
Abstract: The thesis presents a frequency measurement method with high precision on the basis of the study on the former frequency measurement according to the requirement of the development of the present science technology, which is different from the former methods. It is easy in practice and accurate in measurement. The method of frequency measurement uses the relative relationship of the periods of the frequency signal that they are multiple each other. The direct measurement of the frequency is transformed into the measurement of the phase relation that can reflect the frequency information, the rapid change is transformed into the slow change between the phases, and the average frequency diference between the frequency sources can be shown by the change of the phase diference between the two frequency sources. It has proved by a lot of experiments that the lower frequency signal can realize the frequency measurement of the higher frequency that is 105 higher than the lower one. This measurement frequency using direct comparison of the phase relation is a new important method to probe into the accurate measurement of the ultrahigh frequency like the optical frequency.
Keywords: frequency measurement; phase comparison; phase difference; frequency difference