ND：中性密度

“中性密度”（Neutral Density）在学术与科研领域，特别是海洋科学研究中应用广泛。为了方便书写和使用，通常将其简写为“ND”。该术语主要用于描述水体或介质对光的衰减特性，是海洋光学和物理海洋学中不可或缺的重要参数。

The Development of a Real-time Transmittance Measuring System for Linear Variable Neutral Density(ND) Filters
线性渐变滤光片透过率实时测量系统过滤经过或通过滤器
Next is to set down the basic experiment configuration. The optical neutral density filters and the laser output power drove with two power sources are calibrated.
论文的下一个阶段是设计实验装置，对光学中性滤光片进行校正，同时对不同驱动电源下的激光输出功率进行标定。
The last part of the experiment is testing the three different photodetectors which measure the weak output light intensity transferring through the optical neutral density filters, this paper will compare the differences between them, show some of their characteristics respectively and look for their detection limits.
论文最后实验部分通过用三个不同的光探测器测量透过光学中性滤光片后的微弱光，来比较他们之间的区别，分析他们各自的一些特性，寻找他们的探测极限。
Fabricating and testing of neutral density plate
中性变密度盘的加工与检测
An absolute measurement of the neutral density in HT-6B tokamak plasma by resonance fluorescence on HA line
用于托卡马克装置的中性氢密度绝对测量的激光共振荧光散射仪

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