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| 1 | 结合平滑时窗-最小二乘法的光泵磁力仪快速高精度频率测量方法显示文摘为了提高光泵磁力仪频率测量的精度和速度,提出了一种结合平滑时窗-最小二乘法的光泵磁力仪快速高精度频率测量方法。首先,根据光泵磁力仪频率信号的特点,分析了该方法的测量原理和实现方法。然后,推导了频率测量的公式,分析了影响频率测量精度的因素。最后,设计频率测量实验和室外磁场测量实验对提出的方法进行验证。实验结果证明,该方法明显优于多周期同步测频法,在80~350 kHz频率段内均方差均小于2.2×10^(-3)Hz,在磁场测量实验中,采样频率为200 Hz时,噪声功率谱密度为0.001 nT√Hz@1Hz。 | 谭超 辛亮 翟晶晶 杨隆 孙其浩 | 2023 | 计量学报2023，44，10： | 1 |
| 2 | Different Frequency Synchronization Theory and Its Frequency Measurement Practice Teaching Innovation Based on Lissajous Figure Method显示文摘According to the requirement of multi-parameter time and frequency measurement without frequency normalization,a different frequency synchronization theory is proposed based on Lissajous figure method and the variation lawof Lissajous figure which are used in practice teaching of frequency measurement. The theory can achieve high-precision transmission and comparison of time and frequency and precise locking and tracking of phase and frequency,improve the level of scientific research on time and frequency for postgraduate,and promote practice teaching innovation of time frequency measurement for undergraduate. Utilizing the ratio of horizontal and vertical inflection point of the Lissajous figure,the nominal frequency of the measured signal is precisely calculated.The frequency deviation between the measured frequency and its nominal frequency can be obtained by combining the turning cycle of the Lissajous figure. By observing the phase relationship between the frequency standard signal and the measured signal,the accurate measurement of the frequency is implemented. Experimental results showthat the direct measurement and comparison better than the 10-11 order of magnitude with common frequency source can be finished between any signal frequencies.The frequency measurement method based on the theory has the advantage of simple operation,quick measurement speed,small error,lownoise and high measurement precision. It plays an important role in time synchronization,communications,metrology,scientific research,educational technology practice and equipment and other fields. | Xin Geng Songlin Li Guangming Huang Baoqiang Du Jianhua Chen | 2018 | Journal of Beijing Institute of Technology2018，27，2： | 1 |
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