国产一级a毛一级a看免费视频,久久久久久国产一级AV片,免费一级做a爰片久久毛片潮,国产精品女人精品久久久天天,99久久久无码国产精品免费了

您好, 歡迎來到化工儀器網

| 注冊| 產品展廳| 收藏該商鋪

18861759551

technology

首頁   >>   技術文章   >>   了解中性密度濾鏡

江陰韻翔光電技術有限公司

立即詢價

您提交后,專屬客服將第一時間為您服務

了解中性密度濾鏡

閱讀:2133      發布時間:2017-7-24
分享:

Understanding Neutral Density Filters

Neutral Density (ND) filters are designed to reduce transmission evenly across a portion of a specific spectrum. ND filters are typically defined by their Optical Density (OD) which describes the amount of energy blocked by the filter. A high optical density value indicates very low transmission, and low optical density indicates high transmission (Equations 1 – 2). ND filters can be stacked to achieve a custom optical density. To calculate the final system OD, simply add the OD of each filter together.

 

 

Example 1: What is the transmission if OD 0.3 and OD 1.5 filters are stacked?

 

Example 2: How can I build a filter with 0.5% Transmission?

 

ODtotal of 2.3 could be created by stacking OD 0.3 + OD 2.0 or OD 1.0 + OD 1.3.

 

Types of Neutral Density Filters

There are two types of ND filters: reflective and absorptive. Reflective ND filters consist of thin film optical coatings, typically metallic, that have been applied to a glass substrate. The coating can be optimized for specific wavelength ranges such as UV-VIS or NIR. The thin film coating primarily reflects light back toward the source. Special care should be taken to ensure the reflected light does not interfere with the system setup. Absorptive ND filters utilize a glass substrate to absorb light by a specific percentage.

會員登錄

請輸入賬號

請輸入密碼

=

請輸驗證碼

收藏該商鋪

標簽:
保存成功

(空格分隔,最多3個,單個標簽最多10個字符)

常用:

提示

您的留言已提交成功!我們將在第一時間回復您~
在線留言
主站蜘蛛池模板: 靖安县| 松潘县| 即墨市| 星子县| 壤塘县| 荣成市| 尉犁县| 威远县| 布拖县| 吴旗县| 尉氏县| 曲靖市| 长白| 安丘市| 股票| 江口县| 安陆市| 从化市| 保德县| 湟源县| 崇信县| 湘潭市| 洛川县| 朝阳区| 保山市| 蒲城县| 武邑县| 蚌埠市| 留坝县| 卓资县| 白城市| 鄂伦春自治旗| 瑞丽市| 汝州市| 丰都县| 伽师县| 雷州市| 始兴县| 黄山市| 丹江口市| 铜山县|