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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">电容式传感器的工作原理、应用和对测量结果的影响 </h1> <p class="xg1"> 时间：2022-3-7 09:32<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1956)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=9450&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a>来自: OFWEEK</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>电容式传感器是以各种类型的电容器作为传感元件，将被测物理量或机械量转换成为电容变化量变化的一种转换装置，实际上就是一个具有可变参数的电容器。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><p> 电容式<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">传感</a>器是以各种类型的电容器作为传感元件，将被测<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>量或<a href="http://machine.oecr.com" target="_blank" class="relatedlink">机械</a>量转换成为电容变化量变化的一种转换装置，实际上就是一个具有可变参数的电容器。</p><p> 电容式传感器的工作原理</p><p> 电容式传感器也常常被人们称为电容式物位计，电容式物位计的电容检测元件是根据圆筒形电容器原理进行工作的，电容器由两个绝缘的同轴圆柱极板内电极和外电极组成，在两筒之间充以介电常数为ε的电解质时，两圆筒间的电容量为式中L为两筒相互重合部分的长度；D为外筒电极的直径；d为内筒电极的直径；e为中间介质的电介常数。在实际<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>中D、d、e是基本不变的，故测得C即可知道液位的高低，这也是电容式传感器具有使用方便，结构简单和灵敏度高，价格便宜等特点的原因之一。</p><p> 电容式传感器是以各种类型的电容器作为传感元件，由于被测量变化将导致电容器电容量变化，通过测量<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电路</a>，可把电容量的变化转换为电信号输出。测知电信号的大小，可判断被测量的大小。这就是电容式传感器的基本工作原理。</p><p> 电容式传感器的应用</p><p> 电容式传感器具有结构简单、耐高温、耐辐射、分辨率高、动态响应特性好等优点，广泛用于压力、位移、加速度、厚度、振动、液位等测量中。但在使用中要注意以下几个方面对测量结果的影响：</p><p> 1、减小环境温度、湿度变化(可能引起某些介质的介电常数或极板的几何尺寸、相对位置发生变化)；</p><p> 2、减小边缘效应；</p><p> 3、减少寄生电容；</p><p> 4、使用屏蔽电极并接地(对敏感电极的电场起保护作用，与外电场隔离)；</p><p> 5、注意漏电阻、激励频率和极板支架<a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>的绝缘性。</p><p><br></p><p><font face="微软雅黑"> 免责声明：编写或转载此文是为了传递更多的信息，为光电行业尽一些绵薄之力。若文字或图片侵犯了您的合法权益或有不当之处，请作者在20个工作日之内与我们联系，我们将协调给予处理。</font></p><p style="margin: 0px; padding: 0px; color: rgb(143, 143, 143); overflow-wrap: normal;" 255,="" rgb(255,="" yahei",="" start;"="" normal;="" 14px;="" microsoft="" simsun;="" 255);"=""><font style="overflow-wrap: normal;"><font 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