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matengfei
攻人之過(guò)勿太嚴，要思其堪受;教人以善勿過(guò)高，要令其可從。
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樓主  發(fā)表于: 2013-02-17 17:10
圖片：
用玩具激光燈發(fā)射光束，光敏電阻接受。此實(shí)驗是在室內有照明燈時(shí)進(jìn)行。當激光燈發(fā)射光束照在光敏電阻上時(shí)，光敏電阻的阻值為幾百歐姆或更��；當沒(méi)有激光燈發(fā)射光束照在光敏電阻上，但有室內照明燈光時(shí)（非直射），光敏電阻的阻值為十K左右；當用手捂住光敏電阻時(shí)，光敏電阻的阻值為幾十K或上百K。由于室內范圍有限，測試距離為10米。
[ 此帖被matengfei在2013-02-18 08:54重新編輯 ]
yl_pan
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1樓  發(fā)表于: 2013-02-19 11:30
用紅外就行啦

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