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onclick="setCopy('http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=7614', '链接已经复制到剪贴板');" type="submit"> <em>复制链接推荐给好友</em></button> <input type="text" class="px vm" onclick="this.select();setCopy(this.value, '链接已经复制到剪贴板');" value="http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=7614" size="50" /></p> </div> <div class="bm"> <div class="bm_c xld"> <b>乱了:</b><div class="postmsg"><p>I'm sorry, I want to delete all my words.</p><br /> <div align="right"><font color="#000066">[此贴子已经被作者于2006-7-5 20:53:41编辑过]</font></div><br /> </div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>如果真是这样的话的确看起来比较怪。不知道不同的机器这个Ig/Iw能相差多少？这个比值的平均值是多少？</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>我能想到的有几个原因：<BR>1、红色滤片漏光，直接把LED的光传播到光电二极管上去了。<BR>2、仪器漏光，外界光直接进入到光电二极管。以上这两个很容易看出来，黑天关灯后让房间很黑，则光电二极管的电流应为0。<BR>3、纸的位置不同。看设计图，LED用了凸透镜，可能把红色光会聚了，造成对纸的位置很敏感。这个可以很容易用移动白纸的位置来看是否Iw有变化来确定。我感觉该凸透镜应该取消。<BR>4、由于纸透光，因此有可能外界的光（比如窗口、灯）进入仪器，而不同的仪器进入量不同。<BR>5、光电二极管的放大电路不是线性的，有死区，而不同仪器的死区不同。</P></div> <div class="postmsg"><p>I'm sorry, I want to delete all my words.</p><br /> <div align="right"><font color="#000066">[此贴子已经被作者于2006-7-5 20:55:19编辑过]</font></div><br /> </div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>重新问一句：同的机器这个Ig/Iw能相差多少？这个比值的平均值是多少？</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>我感觉与LED极其波长没关系，可以把LED互换来证实。。</P></div> <div class="postmsg"><p>I'm sorry, I want to delete all my words.</p><br /> <div align="right"><font color="#000066">[此贴子已经被作者于2006-7-5 20:59:57编辑过]</font></div><br /> </div> <div class="postmsg">感觉还是差别大了些，Iw大约有多少？</div> <div class="postmsg"><p>I'm sorry, I want to delete all my words.</p><br /> <div align="right"><font color="#000066">[此贴子已经被作者于2006-7-5 21:00:49编辑过]</font></div><br /> </div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" /> 0cm 0cm 0pt">你的第二台比第一台均高<FONT face="Times New Roman">2%</FONT>，我看可能是由于两台发光管光功率分布曲线和光电二极管响应曲线不同造成的。如果第一台的电压比第二台的稍高，按照韦恩定律色温向短波位移，短波曲线部分台高，长波部分由于硅光二极管峰值在<FONT face="Times New Roman">0.9</FONT>μm所以升高不明显，这样第一台的曲线不是第二台曲线普遍向上的位移，而象头上顶一个锅，曲线形状是两头都不成比例的升高。用白纸反射值做分母，某一波长（绿色）做分子，第一台分母大的倍率多于其分子，所以第一台的比值小于比第二台。从用红色发光管测蓝色纸上有反射光说明红色发光管和蓝色二者的单色性不强，所以存在反射光谱的问题，并不是仅有红光。如果红色的单色性强、半宽窄，蓝色的反射值应当是零，但纸的质地本身有一个漫反射值。若假定同样颜色的纸，但表面十分光亮，色纸的反射值比较大。因此要想测准就要选与被测同波长的单色光，比如用窄带滤光片，不用单色性很强的光测不准某波长的反射率。另外照在被测物上的面积尽量大些，避开纸色均匀性的影响；反射角小于<FONT face="Times New Roman">15</FONT>度：不要有外界光；打在光电池上的光要均匀，避开光电池效应均匀性的影响。建议你查一下测量该色物的国标，按国标要求制造仪器，符合计量法。</P></div> <div class="postmsg"><p>I'm sorry, I want to delete all my words.</p><br /> <div align="right"><font color="#000066">[此贴子已经被作者于2006-7-5 21:02:54编辑过]</font></div><br /> </div> <div class="postmsg">如果Iw特别小，有可能是第一级放大的输入偏流不够小引起的。用的是运放吗？什么型号？电压多少？</div> <div class="postmsg"><p>I'm sorry, I want to delete all my words.</p><br /> <div align="right"><font color="#000066">[此贴子已经被作者于2006-7-5 20:59:11编辑过]</font></div><br /> </div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>SGM324看来还是不错的，不知道哪里能买到？我正找这种低压、低偏、轨轨运放呢。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>10pA的典型值不算大，看来Ib引起的可能性也不大。但好象厂家没给出最大值，这可能比典型值大很多。要是光电流比较小，那么其2%就可能与漏电流相比了。程序上做减法可能引起不稳定，因为你不知道该减多少。另外，这个Ib是变化的，而且变化可能很大。</P></div> <div class="postmsg"><p>I'm sorry, I want to delete all my words.</p><br /> <div align="right"><font color="#000066">[此贴子已经被作者于2006-7-5 20:58:28编辑过]</font></div><br /> </div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>这个方法应该可以，Ib也不会变化那么快，所以看来还不是Ib引起的。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>我在大连，需要SGM424和类似的几种运放，感谢！</P></div> <div style="height200px;"></div> </div> </div> </div> </div></div> </div> <!--autocomment filter by maxnum--> <div class="ft_wp"> <div id="ft" class=" cl"> <div id="flk" > <p> <a href="http://wpa.qq.com/msgrd?V=3&Uin=20600600&Site=光电工程师社区&Menu=yes&from=discuz" target="_blank" title="QQ"><img src="static/image/common/site_qq.jpg" alt="QQ" /></a><span class="pipe">|</span><a href="http://m.oecr.com" >手机版</a><span class="pipe">|</span><a href="http://so.oecr.com" title="站内搜索" target="_blank" >搜索</a><span class="pipe">|</span><a href="http://www.focaloptics.com" title="主办单位：武汉焦点光学技术有限公司" target="_blank" >焦点光学</a><span class="pipe">|</span><a href="http://www.oecr.com" target="_blank">光电工程师社区</a> ( <a href="http://beian.miit.gov.cn/" target="_blank">鄂ICP备17021725号-1</a> <a href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=42011102000821" 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