An absolute distance heterodyne interferometer using a dual longitudinal mode He Ne laser is proposed. 提出了一种采用双纵模稳频激光器的新型绝对距离测量外差干涉仪。
Focusing on finite dimensional Hilbert spaces, they discuss the statistical distance measures and entropies used in quantum theory. 集中于有限维希尔伯特空间，他们讨论统计距离测量和熵在量子理论内使用。
The errors of the stand-off measurement and measurement errors made by pitch diameter gauge and ovality gauge are analyzed and compared. 分析比较了紧密距测量以及中径和椭圆度量规测量的误差。
