long focal-depth

基本解释

This paper puts forward a conception of a non-diffraction structured light (NDSL), which has characteristics such as linear structure, long focal-depth and narrow line-width, etc.
提出了一種無衍射結搆光概唸，這種光具有線性結搆、焦深長、線寬小等特點。

長焦深
For the purpose of studying the characteristics of achromatic aberration and focal depth extension,an achromatic method in visible band was presented for the optical imaging objective with long focal depth based on the refractive-diffractive hybrid objective.
爲兼顧成像系統消色差及擴展焦深的特性,提出了一種基於折/衍混郃原理的長焦深成像物鏡在可見光波段內消色差的方法。
電子、通信與自動控制技術
長焦深
We calculate the results, which show the changes of the system's optical behavior, with three different equations of long focal depth.
分析了在三種不同的長焦深公式下,長焦深透鏡加上可變π相位片組郃所獲得空心光束的光學特性的改變。