An absolute distance heterodyne interferometer using a dual longitudinal mode He Ne laser is proposed. 提出了一種采用雙縱模穩頻激光器的新型絕對距離測量外差干涉儀。
Focusing on finite dimensional Hilbert spaces, they discuss the statistical distance measures and entropies used in quantum theory. 集中于有限維希爾伯特空間，他們討論統計距離測量和熵在量子理論內使用。
The errors of the stand-off measurement and measurement errors made by pitch diameter gauge and ovality gauge are analyzed and compared. 分析比較了緊密距測量以及中徑和橢圓度量規測量的誤差。
