focal-ratio degradation

Aiming at the application of the telescope, the main performance of the fiber are the spectral-transmission efficiency and the focal-ratio degradation.
針對(duì)此望遠(yuǎn)鏡的應(yīng)用，對(duì)光纖的要求主要集中在對(duì)星光的傳輸性能和焦比蛻化性能上。