| 1. | Design of numeral type phase difference measurement instrument
数字式工频电压相位差测量仪的设计 |
| 2. | Results of experiment show that the two algorithms put forward in this paper are effective in phase difference measurements of high speed and precision
相位差检测实验结果表明，提出的方法能快速准确地实现相位差的检测。 |
| 3. | Algorithms concerning phase difference measurement , viz , the zero passage method and the relevant function method are brought forward
摘要针对相位差检测的过零法和相关分析法，阐述了算法的检测原理，讨论了影响相位差检测精度和快速性的因素。 |
| 4. | Developing the phase introduction logging faces two key problems namely calibration and phase difference measurement . this paper has researched that two problems deeply and has obtained many important results
相位感应测井仪的研发不可避免地面临两大关键问题,即仪器刻度和相位差检测。 |
| 5. | Simulations show that this method is effective . observability analysis and error analysis are also given . in chapter three , ambiguity elimination for phase difference measurement data is discussed
本章还针对该无源定位问题进行了可观测性分析和单次定位随机误差分析，给出了分析结果。 |
| 6. | A virtual phase difference meter is developed based on the principle of phase difference measurement of phase - locked loop , and the main requirements for data acquisition device are given
发了一种基于锁相环的相位测量原理而设计的虚拟相位差测量仪，并给出了该系统对数据采集设备的主要要求。 |
| 7. | The purpose of subject is to achieve the phase difference measurement of two 50 hz sine signals . based on the further analysis about all kinds of phase measurement system , the research of phase measurement system for 50 hz sine signals is made in the paper
本课题是以实现两路工频正弦信号的相位测量为目的，在对国内外的各种相位测量系统进行了深入分析的基础上，针对相位测量系统的各个环节进行了研究。 |
| 8. | The main contents as follows : 1 . studied the ideal second class calibration system , having studied kinds of parameters of the calibration system and environment ’ s influence on the phase difference measurement and have obtained many important results . put forward an engineering calibration system , and obtained the phase difference - - electric conductivity rate curve and analyze the system ’ s error margin etc . important
本文就这两大关键问题做了深入的研究,主要内容为如下: 1 .研究了相位感应测井理想二级刻度器模型中各种参数和环境对测量精度的影响,得到了许多重要的结论;同时提出了一种工程上切实可行的刻度系统方案,给出了相位差-电导率曲线以及系统误差等重要参数。 |
| 9. | Measurement accuracy of phase - shift laser range finders is up to millimeter level in large range through multi - frequency modulation and high precision phase difference measurement . however , laser range finders existing is not suitable for large range high speed tracing measurement for their complex multi - frequency modulation circuit and conflict between precision and speed in phase - shift measurement . in order to improve the large range measurement speed and accuracy , key technologies on multi - frequency modulation and high precision phase - shift measurement are deeply researched in this paper
相位法激光测距采用多频调制和高精度的相差测量技术可以在大范围内实现毫米甚至更高精度的测量,但现有的测量装置由于存在多频调制电路复杂和没有很好的解决相差测量的高精度和快速测量之间的矛盾问题,使得相位法激光测距很难应用于大范围目标快速的跟踪测量。 |
