后焦线 meaning in Chinese

posterior focal line

Its fundamental is that the ray emitted from a focus ( front ) of elliptical will flock together on the other focus ( back ) by the reflection on the elliptical surface . we set a scatter aperture on the back focus
椭圆柱面的前焦线上是射线源，晶体固定在一个椭圆基底上，其表面构成一椭圆柱面， x射线经晶体衍射后会聚于后焦线上。
Through the aperture the x - ray will shoot on the detector and goes on record . high resolving power . twin channels are utilized for simultaneous time - integrated photographic recording and for time - resolved x - ray streak camera recording
后焦线处置一狭缝，通过狭缝的射线投射到探测面上被记录下来；分辨率高；双通道同时完成x射线衍射的时间分辨和空间分辨；操作灵活，方便装卸。