有关大功率LED亮度的计量方式
<div style="LAYOUT-GRID:15.6pt none" class="Section0"><p style="LINE-HEIGHT: 18pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt; BACKGROUND: rgb(255,255,255)" class="p0"><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> </span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">与传统光源一样，</span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><a href="http://www.runlite.cn/cn/product-default-21.html">大功率<font face="Tahoma">LED</font></a></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">光源的光学度量单位都是统一的。为了使各位读者瞭解和方便使用，下面将有关知识进行简要介绍：</span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">一、 光通量</span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> </span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">光通量是指光源在单位时间内发出的光量，即辐射功率能够被人眼所感受到的那部分辐射能量。它等于单位时间内某一波段的辐射能量和该波段的相对视见率的乘积。由于人眼对不同波长光的相对视见率不同，所以不同波长光的辐射功率相等时，光通量并不相等。光通量的符号为<font face="Times new=" Roman? New?>Φ</font><font face="宋体">，单位为流明（</font><font face="Tahoma">Lm</font><font face="宋体">）。</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> </span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">根据光谱辐射通量<font face="Times new=" Roman? New?>Φ</font><font face="宋体">（</font><font face="Times new=" Roman? New?>λ</font><font face="宋体">），因此可得出光通量公式：</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> Φ<font face="Tahoma">=Km</font><font face="Times new=" Roman? New?>■Φ</font><font face="宋体">（</font><font face="Times new=" Roman? New?>λ</font><font face="宋体">）</font><font face="Tahoma">gV</font><font face="宋体">（</font><font face="Times new=" Roman? New?>λ</font><font face="宋体">）</font><font face="Tahoma">d</font><font face="Times new=" Roman? New?>λ</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> </span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> </span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">式子中，Ｖ（<font face="Times new=" Roman? New?>λ</font><font face="宋体">）</font><font face="Times new=" Roman? New?>—</font><font face="宋体">相对光谱光视效率；</font><font face="Tahoma">Km</font><font face="Times new=" Roman? New?>—</font><font face="宋体">辐射的光谱光视效能的最大值，单位为</font><font face="Tahoma">Lm/W</font><font face="宋体">。</font><font face="Tahoma">1977</font><font face="宋体">年由国际计量委员会确定</font><font face="Tahoma">Km</font><font face="宋体">值为</font><font face="Tahoma">683Lm/W</font><font face="宋体">（</font><font face="Times new=" Roman? New?>λ</font><font face="Tahoma">m</font><font face="宋体">＝</font><font face="Tahoma">555nm</font><font face="宋体">）。</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">二、 光强度</span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> </span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">光强度是指在单位时间内单位面积上通过的光能量，能量与频率成正比，是他们的强度之和<font face="Tahoma">(</font><font face="宋体">即积分</font><font face="Tahoma">)</font><font face="宋体">，也可以理解为光源在给定方向上的发光强度</font><font face="Tahoma">I</font><font face="宋体">是该光源在该方向的立体角元内传输的光通量ｄ</font><font face="Times new=" Roman? New?>Φ</font><font face="宋体">除以该立体角元ｄ</font><font face="Times new=" Roman? New?>Ω</font><font face="宋体">之商</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">发光强度的单位是坎德拉（<font face="Tahoma">cd</font><font face="宋体">），</font><font face="Tahoma">1cd</font><font face="宋体">＝</font><font face="Tahoma">1Lm/1sr</font><font face="宋体">。空间各个方向的光强之和就是光通量。</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">三、光亮度</span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> </span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">我们在测试</span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">大功率<font face="Tahoma">LED</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">芯片的亮度和评价</span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">大功率<font face="Tahoma">LED</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">光辐射安全性的过程中，一般采用成像法，对于芯片的测试可以采用显微成像进行测量。光亮度是光源发光表面上某一处的亮度<font face="Tahoma">L</font><font face="宋体">，是该面元ｄＳ在给定方向上的发光强度除以该面元在垂直于给定方向平面上的正投影面积之商</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: '宋体'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"> </span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">光亮度的单位是坎德拉每平方米（<font face="Tahoma">cd/m2</font><font face="宋体">）。当发光表面与测量方向垂直时，则</font><font face="Tahoma">cos</font><font face="Times new=" Roman? New?>θ</font><font face="宋体">＝１</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">四、光照度</span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">光照度是指物体被照亮的程度，采用单位面积所接受的光通量来表示。光照度与照明光源、被照表面及光源在空间的位置有关，大小与光源的光强和光线的入射角的余玄成正比，而与光源至被照物体表面的距离的平方成反比。表面上一点的照度<font face="Tahoma">E</font><font face="宋体">是入射在包含该点面元上的光通量ｄ</font><font face="Times new=" Roman? New?>Φ</font><font face="宋体">除以该面元面积ｄＳ之商。</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">单位为勒克斯（<font face="Tahoma">LX</font><font face="宋体">），</font><font face="Tahoma">1LX</font><font face="宋体">＝</font><font face="Tahoma">1Lm/m2</font><font face="宋体">。</font></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><br/></span><span style="FONT-FAMILY: 'Tahoma'; BACKGROUND: rgb(255,255,255); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p>
<p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-FAMILY: 'Times new=" New? ?yes?? mso-spacerun: 10.5pt; FONT-SIZE: Roman?;><o:p></o:p></span></p></div><!--EndFragment-->
[此贴子已经被作者于2013/3/1 13:20:50编辑过]
学了
页:
[1]