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class="title21">影響超聲波物位計的幾個主要指標</div> <div id="62vf72am6" class="contentinfo pc_show">作者：<a>ryadmin</a> 添加時間：2018-12-05 16:35:17 瀏覽：<script src="/index.php?case=archive&act=view_js&aid=66"></script></div> <div class="62vf72am6" id="content" class="clear"> <!-- 正文 --> <p>主要指標介紹：</p><p>1、量程。代表超聲波物位計所能測量的范圍，反映的是換能器的靈敏度。量程越大，靈敏度越高。超聲波物位計可以配置4、6、8、10、20、30m等不同量程的換能器。當超聲波衰減快，界面反射差時，為避免超聲波探頭接收到的超聲波信號過弱，而無法與噪音信號區分，就需要增大換能器的發射功率。</p><p>2、盲區。也叫死區，就是超聲波物位計測量不到的一段距離。超聲波物位計在發射超聲波脈沖時，不能同時檢測反射回波。由于發射的超聲波脈沖具有一定的時間寬度，同時發射完超聲波后傳感器還有余振，期間不能檢測反射回波，因此從探頭表面向下開始的一小段距離無法正常檢測，這段距離稱為盲區。相同量程的產品，盲區越小，就說明這個換能器的設計越好。</p><p>3、溫度。正常范圍是-10~60攝氏度。雖然壓電陶瓷的極限工作溫度一般是150攝氏度，但超聲波物位計在制造過程中的大多數材料都不能在100攝氏度以上的溫度長期工作。</p><p>4、精度。主要受溫度變化影響較大，為保證測量精度，大多數超聲波物位計都帶有溫度補償功能。另外在氣體成分的變化也會對超聲波物位計的精度產生影響，比如一些揮發性的液體，揮發后導致空氣成分變化，導致氣體的聲速變化，引起測量誤差。在常溫常壓以及不受外部環境干擾情況下，大部分廠家可以將精度控制在0.5%以內。</p><p>5、兩線制與三線制。兩線制超聲波物位計其供電(DC24v)與信號輸出(DC4-20mA)共用一個回路，也就是僅使用兩條線即可，不足之處是發射功率相對略微微弱一些。三線制超聲波物位計實際上為四線制，其供電(DC24v)與信號輸出(DC4-20mA)回路分離，各使用兩條線，當它們負端共地相連時，通常使用三條線即可，其優勢是發射功率較大。 </p><p><br/></p><div id="62vf72am6" class="clear"></div> <div id="62vf72am6" class="blank30"></div> <div id="62vf72am6" class="blank30"></div> <!--自動調用自定義字段--> <!-- 自定義表單開始 --> <!-- 自定義表單結束 --> <!-- 投票 --> <script 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