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<h2 class="title_entry">有关夜光粉的亮度问题</h2><div class="p_entry2" id="textboxContent"><p class="MsoNormal" style="margin:0cm 0cm 0pt"><font size="3"><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">关于夜光粉的亮度问题常常在新客户中产生疑惑</span><span lang="EN-US"><font face="Times New Roman">,</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">明明厂家说可以亮</span><span lang="EN-US"><font face="Times New Roman">10</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">小时怎么半小时就看不见了</span><span lang="EN-US"><font face="Times New Roman">,</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">马上联想到生产厂家骗人</span><span lang="EN-US"><font face="Times New Roman">,</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">引起一些不必要的误会.</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /><br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">通常发光材料的亮度的单位是 </span><span lang="EN-US"><font face="Times New Roman">cd/m2(</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">坎德拉每平方米</span><span lang="EN-US"><font face="Times New Roman">)</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,而夜光粉的亮度一般是</span><span lang="EN-US"><font face="Times New Roman">mcd/m2(</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">毫坎德拉每平方米</span><span lang="EN-US"><font face="Times New Roman">)</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,我们来看看常见的光源的亮度就会明白了,</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /><br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">正午的阳光下达到1~10万</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">白天一般室内只有1000~5000</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">而我们晚上的灯光一般在100~1000</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">应急灯的亮度要求大于50</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">新的电致发光标牌,亮度只有20~100</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">我们夜光粉制成的发光标牌最高亮度不会超过10</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,而且是在激发光源停止的瞬间,在2分钟后的亮度只有1~2</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,一小时后一般0.060~0.0990</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,十小时后一般0.006~0.010</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">.</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /><br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">所以在白天观察夜光粉的亮度,由于环境光的存在(即使是在较黑的暗室里下,也会超过1</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">),只是我们由于室外室内强烈的对比,眼睛觉得很暗了,这个环境中观察,夜光粉往往在一小时左右就观察不到发光了。如果用一个抽屉或纸筒什么避光观察,那么10多分钟就看不见夜光粉的发光了。</span></font><font size="3"><span lang="EN-US"><font face="Times New Roman"> <br /><br /></font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">那么我们夜光粉的生产厂家为什么说可以发光10个小时呢,原因在于人眼睛在全黑暗条件下可以观测到的光线非常的弱为0.00032</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,而通常夜光粉亮度衰减到这个亮度以下的时间可以达到10000分钟以上,也就是说可以持续发光10000分钟(166.67小时)理论上人的眼睛还可以看得见.而为了形象的说明夜光粉的亮度,在早期推广长余辉夜光粉的时候,说成可以发光8小时10小时等等,和通常只能持续发光1小时以内的硫化锌夜光粉区别开来。为了准确的表达以及测试仪器的普及应用,现在逐步为1小时数据所代替,由于</span><span lang="EN-US"><font face="Times New Roman">cd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">单位较大,所以夜光粉通常采用</span><span lang="EN-US"><font face="Times New Roman">mcd/m2(</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">毫坎德拉每平方米</span><span lang="EN-US"><font face="Times New Roman">)</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">,一般来说一小时亮度都在10~100</span><span lang="EN-US"><font face="Times New Roman">mcd/m2</font></span><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’">之间,不同的粒度及产品级别亮度都不一样,由于夜光粉粒度越大亮度越高,而大的颗粒度使用性能不好,所以在同样亮度条件下,粒度越小的产品越高档,当然价格也越贵,为了节省材料成本,一般都会在工艺条件允许的情况下选用较粗的产品达到较高的制品亮度。</span></font></p><p class="MsoNormal" style="margin:0cm 0cm 0pt"><font size="3"><span style="font-family:宋体;mso-ascii-font-family:’times new roman’;mso-hansi-font-family:’times new roman’"> 文章选自<a href="http://anyanjia.blog.bokee.net/bloggermodule/blog_viewblog.do?id=340488">http://anyanjia.blog.bokee.net/bloggermodule/blog_viewblog.do?id=340488</a></span></font></p></div>
有关夜光粉的亮度问题
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