介绍了利用高灵敏度四象限硅光电管作为探测器的二维小角度测量系统，详细分析了其测试原理及实验装置。
This paper introduces the dual axis small Angle measuring system, which USES quadrant si-photoelectric cell as the detector, analyzes the measuring principle, experimental equipment.
如何测量回波的多普勒频移，实现测流速的目的。 文中从二维信号矢量的角度分析了多普勒频移调制和解调的过程，推导出提取速度信息的信号处理方法。
Using two-dimensional signal vectors, the process of Doppler shift modulation and demodulation is analyzed, and a signal processing method for extracting flow speed information is derived.
研究结果显示，本研究突破以往用二维影像的测量来代表三维空间的距离及角度，避免以往因单张影像测量所造成的误差。
The distances between the bony landmarks and joint line are also measured. The results of this study suggest that 3D conceptual measurement can reduce the errors from 2D images measurement.
研究结果显示，本研究突破以往用二维影像的测量来代表三维空间的距离及角度，避免以往因单张影像测量所造成的误差。
The distances between the bony landmarks and joint line are also measured. The results of this study suggest that 3D conceptual measurement can reduce the errors from 2D images measurement.
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