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<div id="favatar149143" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-10349.html" target="_blank" class="xw1" style="color: #FF9900">刘武青</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo149143" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo149143_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-10349.html" target="_blank" class="xi2" style="color: #FF9900">刘武青</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=10349&do=profile" target="_blank" class="xi2">12199</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=10349&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=%C1%F5%CE%E4%C7%E0" id="a_showip_li_149143" 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class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_149143"> <P>==================================== 建议用刘启新先生的仪器<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>光压力的变化 作者:刘武青(xxx.xxx.xxx.xxx) 2004/05/12 21:23 字节:187 点击:0次 帖号:46858 当前<a href="http://bbs.oecr.com" target="_blank" class="relatedlink">论坛</a>: [挑战相对论]讨论区 [hongbin.xilubbs.com] </P> <P>当光通过旋转透明介质与此透明介质静止时,光压力的变化.</P> <P>谢谢</P> <P>刘武青,三个效应, <a href="http://cqfyl.nease.net" target="_blank" >http://cqfyl.nease.net</A></P> <P>------------------------------------- 刘启新单臂水平扭秤 [senpy] 4K 05.12 16:54 11 建议用刘启新先生的仪器测量光压力的变化 [刘武青] 187 05.12 21:23 0 设计很巧妙，不知效果如何 [jiuguang] 156 05.12 18:12 5 灵敏度可调节 [senpy] 387 05.12 21:06 3 =================================== 刘启新单臂水平扭秤 作者:senpy(xxx.xxx.xxx.xxx) 2004/05/12 16:54 字节:4K 点击:11次 帖号:46835 当前论坛: [挑战相对论]讨论区 [hongbin.xilubbs.com] 为区别外国人的卡文迪许水平扭秤, 我想定名为刘启新单臂水平扭秤, 这按清华小猪的建议改的, 当时设计制作,都是刘启新先生一人完成的, 我只是观测记录,从1986~1988年,运行了二年多, 测出了太阳黑子群的变化, 日蚀引力异常等等.还测出了两个分币之间的引力, 当时的参数: 1芦杆长80cm, 一芦苇杆长140cm, 底版玻璃4cm×5cm×0.6cm , 上贴坐标纸, 离底10cm处用大头针连接1和一, 摆垂在另一端,铜质3克, 置于140cm端处, 插入黑色猪综作为指针,在139cm处, 捆上细线155cm, 另一端捆在1的上端, 以资负重, 因为芦杆只能承受径向压力, 而不能承受摆垂向下的弯曲, 所以用细线连于直杆1的上端, 使一杆微微上翘, 有一次制作竞上翘60cm, 以上是基本参数, 细线要用桃胶上浆, 被免伸缩, 其他细节各人自行设计该可, 刘老师是用四条玻璃长条连接1的上下, 用环氧树脂胶合,整个装置悬空, 置于双人床内, 用透明膜密封.</P> <P>卡文迪许扭秤的水平臂上有两个球体,是对称的, 不好?只取其中一半, 这就会失去平衡, 水平摆克服了这一缺点, 它象一个直立的人, 将左臂平伸成一字, 人身象1字, 这1一接在一起, 一的外端设置重物, 铜或铅都行, 不能用铁, 因为铁会受磁力的影响, 1 的上下两端中心插入钢针, 固定. 下端钢针放在玻璃上, 为防止滑动, 可在玻璃上贴一张纸, 1 的上端钢针放在人字形两张刀片的中间, 可以转动, 其摩擦力→0, 下端针尖在玻璃上转动, 其摩擦力也是→0, 如果1 长50cm, 上端可向左倾斜0.3~0.8cm , 倾斜越小, 灵敏度越高, 摆动的幅度越大, 就象高灵敏度天平不易平衡,总是两边摆动一样, 高灵敏度仪器都有这样的缺点, 当年我将五分镍币接近摆垂0.5cm, 水平摆开始摆动, 要5~8分钟之后才能吸在一起, 放在地上, 水平摆有周日变化, 这是因为太阳位置变化引起的, 把整个装置吊起来, 可消除环境变化的影响, 可测到g的负9~负10次方的量级. 1和一两条杆子要轻, 我是用芦杆做的共重不超过10g </P> <P>作者:清华小猪(xxx.xxx.xxx.xxx) 2004/05/12 09:45 字节:362 点击:8次 帖号:46768 </P> <P>当前论坛: [挑战相对论]讨论区 [hongbin.xilubbs.com] </P> <P>非也非也！ </P> <P>大山实验中大山的引力比铁球强，但梯度小，所以扭秤不可用。但水平摆（我觉得“单臂水平扭秤”是更恰当的名字）用的是单臂，测的就不是引力梯度而是绝对引力，所以也可用。</P> <P>哈哈，谢谢LQX，竟然有这么简单有效的实验仪器。也可用在卡氏实验中。不过单臂要靠其它物体支撑，会有磨擦，在这一点上不如扭秤。 ============================================ 设计很巧妙，不知效果如何 作者:jiuguang(xxx.xxx.xxx.xxx) 2004/05/12 18:12 字节:156 点击:5次 帖号:46837 当前论坛: [挑战相对论]讨论区 [hongbin.xilubbs.com] </P> <P> 仪器处于不稳定的平衡状态，而摆动频率似乎是仪器本身决定的。外部的引力作用如何测出来呢，破坏脆弱的平衡？但要测出引力的大小恐怕难度就大了。 ============================================= 灵敏度可调节 作者:senpy(xxx.xxx.xxx.xxx) 2004/05/12 21:06 字节:387 点击:3次 帖号:46855 当前论坛: [挑战相对论]讨论区 [hongbin.xilubbs.com] </P> <P> 以上设计是高灵敏度的,可测到g的负9~负10次方的量级, 是测量太阳引力的微弱变化用的, 比美国萨克斯青铜扭摆的灵敏度高出4~5个数量级, 摆幅最大值可达12度, 也有只摆动三五格(坐标纸的小格子), 有时一停好几天不摆动的情况也有, 这正是测量两个小物体引力大小的好时机, 其实测量引力大小用不作这样悬空, 就放在地上都行, 1一杆长各30cm, 用 匚 型架支撑, 1杆偏离铅垂0.5cm都行, 这时摆处于平衡不动状态, 正好测量引力, </P> <P>============================================= </P></td></tr></table> </div> <div id="comment_149143" class="cm"> </div> <div 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