照相透镜重镀增透膜及使用情况

介结了云南天文台太阳光谱仪１９８８年进行的重镀１１块照相透镜增透膜以及镀膜后的使用情况。重镀增透膜前照相透镜的透过率已降低到７７％～８４％，重镀后提高到９２％～９８％。相对于镀膜之前的透过率数值提高１４％～２６％，照相露光时间缩短１倍左右。

Recoating of Reflection Reducing Film and the Exploitation for the Photographic Lenses

In order to prepare the solar observation during the solar maximum of the 22nd cycle, the reflection reducing flim was recoated for the eleven photographic lenses of the solar spectrograph at Yunnan Observatory in 1988. The status of exploitation is given for the spectrograph after the recoating. The transmissivity of these lenses is only 77%-84% before and 92%-98% after recoating,i.e. the transmissivity of the lenese is increased 14%-26%. The exposure time of the photograph of the spectrograph is only half of that before the recoating. Thses lenses have been used for about 8 years since they were recoated.