B超探头六部曲之探头的常见故障

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                    <section data-role="outer" label="Powered by gulangu"><section><p><p><img src="image/20200927/43d68624d482821c5ce04e4f6e65e1c4_1.png" /></p></p><p><p><img src="image/20200927/9bb515bc6ac8054868eeaaa67306b207_2.png" /></p></p><p><br  /></p></section><section data-tools="gulangu" data-id="86534"><section data-width="95%"><section><section><section><section><span data-brushtype="text">B超探头的常见故障</span></section></section></section><section><section></section><section data-width="60%"></section></section><section><section><section><br  /></section></section></section></section><p><span><span>1</span></span></p></section></section><p><br  /></p><p><p><img src="image/20200927/af2887083a9a1566f55e8e9c06809366_3.png" /></p></p><p><br  /></p><section data-tools="gulangu" data-id="89889"><section data-id="us514149"><section><section><p><img src="image/20200927/e655d4f7de87112becb99524a447e7ed_4.jpg" /></p></section><section data-brushtype="text">1、外观不良（直接观察有无破损）</section><section><p><img src="image/20200927/39be927f5bc8977473c77afb9c44e584_5.jpg" /></p></section></section><section data-width="100%"></section></section></section><p><span><br  /></span></p><p><span>⑴、最外声透镜破损，会导致耦合剂进入探头内</span><span>部，从而影响探测范围，甚至测不出图像。</span></p><p><br  /></p><p><span>⑵、声透镜声透镜起泡造成凸凹不平时，则会导</span><span>致使用时必须用力往下按才能测到图像。</span></p><p><br  /></p><p><span>⑶、探头最前端声透镜是会聚或发散声波的声学</span><span>元件，当声透镜脱落时，肯定导致不能探测。</span></p><p><br  /></p><section data-tools="gulangu" data-id="89889"><section data-id="us514149"><section data-width="100%"><section><section><p><img src="image/20200927/e655d4f7de87112becb99524a447e7ed_4.jpg" /></p></section><section data-brushtype="text">2、B超显示区有暗道</section><section><p><img src="image/20200927/39be927f5bc8977473c77afb9c44e584_5.jpg" /></p></section></section></section><section data-width="100%"></section></section></section><p><p><img src="image/20200927/883e9a219199e05112a68c45469b43a1_8.png" /></p></p><p><br  /></p><p><span>B超探头里信号没有输入输出，会导致显示区有暗道，可能有以下原因：</span></p><p><br  /></p><p><span>探头的晶片中的某一个振片坏掉。</span></p><p><br  /></p><p><span>传送信号的电缆线断掉。</span></p><p><br  /></p><p><span>信号板铜皮线路或过孔由于某种原因不通。</span></p><p><br  /></p><p><span>信号板芯片虚焊或烧坏等等。</span></p><p><br  /></p><section data-tools="gulangu" data-id="89889"><section data-id="us514149"><section data-width="100%"><section><section><p><img src="image/20200927/e655d4f7de87112becb99524a447e7ed_4.jpg" /></p></section><section data-brushtype="text">3、显示图像模糊</section><section><p><img src="image/20200927/39be927f5bc8977473c77afb9c44e584_5.jpg" /></p></section></section></section><section data-width="100%"></section></section></section><p><br  /></p><p><p><img src="image/20200927/2169b2d763ba739a031a49981d375fc7_11.png" /></p></p><p><span><br  /></span></p><p><span>探头本身的自然损耗。是因为探头都有一定的使用期限，超过使用期限后，就可能发生衰老、变质、绝缘降低和机械磨损等现象，严重的甚至完全失效、漏电等，造成故障。</span></p><p><br  /></p><p><span>探头的使用环境较差。主要是环境温度、湿度，空气中含腐蚀性气体和灰尘，探头受到强烈振动，电源电压波动过大，这些都可能引发仪器故障。</span></p><p><span><br  /></span></p><p><p><img src="image/20200927/c442cf89f96a494cb112fd800c04bed9_12.png" /></p></p><p><span>探头屏蔽线及地线没接地或断了，导致机器受干扰。B超探头所采用的电缆是质量要求很高的多芯高屏蔽电缆，做工十分精细，电缆内导线严密，多的有上百根，似发丝粗细。由于探头多方位的使用，电缆的弯曲、扭转使得电缆的外保护区绝缘层会破皮、断裂、露出了里面的信号线，屏蔽层的破坏、断线，图像就会产生干扰的波纹和缺损，继而导致图像显示模糊。</span></p><p><br  /></p><section data-tools="gulangu" data-id="86534"><section data-width="95%"><section><section><section><section><span data-brushtype="text">B超探头问题的常见判定方法</span></section></section></section><section><section></section><section data-width="60%"></section></section><section><section><section><br  /></section></section></section></section><p><span data-original-title="" title="">1</span></p></section></section><p><br  /></p><p><p><img src="image/20200927/0ac0a84b1c892542f46a0b711e4a49bd_13.png" /></p></p><p><br  /></p><p><br  /></p><section data-tools="gulangu" data-id="89889"><section data-id="us514149"><section data-width="100%"><section><section><p><img src="image/20200927/e655d4f7de87112becb99524a447e7ed_4.jpg" /></p></section><section data-brushtype="text">1、上机人体实测法</section><section><p><img src="image/20200927/39be927f5bc8977473c77afb9c44e584_5.jpg" /></p></section></section></section><section data-width="100%"></section></section></section><p><br  /></p><p><br  /></p><p><span>开机前将B超探头组件与B超诊断仪连接并固定（探头与诊断仪的连接及拆卸必须在关机状态下进行），运行机器，把探头放置在观察区，观看显示器上显示区图像的情况，再进行相应的处理方案。</span></p><p><br  /></p><section data-tools="gulangu" data-id="89889"><section data-id="us514149"><section data-width="100%"><section><section><p><img src="image/20200927/e655d4f7de87112becb99524a447e7ed_4.jpg" /></p></section><section data-brushtype="text">2、电容表法</section><section><p><img src="image/20200927/39be927f5bc8977473c77afb9c44e584_5.jpg" /></p></section></section></section><section data-width="100%"></section></section></section><p><br  /></p><p><br  /></p><p><span>根据不同厂家机型的探头定义图，测量各个振元插针引脚对地的电容值，看其是否在规定的容值内。</span></p><p><br  /></p><section data-tools="gulangu" data-id="89889"><section data-id="us514149"><section data-width="100%"><section><section><p><img src="image/20200927/e655d4f7de87112becb99524a447e7ed_4.jpg" /></p></section><section data-brushtype="text">3、幅值观察法</section><section><p><img src="image/20200927/39be927f5bc8977473c77afb9c44e584_5.jpg" /></p></section></section></section><section data-width="100%"></section></section></section><p><br  /></p><p><br  /></p><p><span>这种测试方法是利用专门的设计工装。</span></p><p><br  /></p><p><span>这种工装在测试时，将探头接在该专用测试工装上，而其连于PC机，打开其测试的相关配套软件，可直观地根据显示的电容值区域，来判定探头的故障原因。</span></p><p><br  /></p><p><span>如下图，就是利用专门的工装，从电脑上形象直观的可以看出电容的幅值大小。</span></p><p><span><br  /></span></p><p><p><img src="image/20200927/52a94956a3517b5642c472572c890012_20.png" /></p></p><p><span>图中为109损坏，138、139因老化而容值过大。</span></p><p><br  /></p><section data-tools="gulangu" data-id="89889"><section data-id="us514149"><section data-width="100%"><section><section><p><img src="image/20200927/e655d4f7de87112becb99524a447e7ed_4.jpg" /></p></section><section data-brushtype="text">4、示波器测量法</section><section><p><img src="image/20200927/39be927f5bc8977473c77afb9c44e584_5.jpg" /></p></section></section></section><section data-width="100%"></section></section></section><p><br  /></p><p><p><img src="image/20200927/ca8a5d1dad42548c4cd1f592e6a5008c_23.png" /></p></p><p><span><br  /></span></p><p><span>利用示波器的测量方法同电容表法测试原理一样，也是根据示波器来测量各振元插针对地的电容值，再根据相应正常值得对比表判定。</span></p><p><br  /></p><section data-role="paragraph"><p><br  /></p></section><section><p><br  /></p><p><span><strong><span>【版权声明】：</span><span>本文由整理发布，资料源自网络，版权归原作者所有，转载请注明来源！</span></strong><br  /><br  /></span></p><section><p><img src="image/20200927/6b4a4843a9a50c23239def17d3ff5794_24.jpg" 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