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聲級計的工作原理和分類(lèi)</div></div> <h1 class="tittle">聲級計的工作原理和分類(lèi)</h1> <div id="f9rdfrffl7j" class="wz_time">更新日期：2023-07-17 瀏覽次數：827 </div> <div id="f9rdfrffl7j" class="nr"><div><strong>聲級計</strong>是基本的噪聲測量?jì)x器，它是一種電子儀器，但又不同于電壓表等客觀(guān)電子儀表。在把聲信號轉換成電信號時(shí)，可以模擬人耳對聲波反應速度的時(shí)間特性；有不同靈敏度的特性以及不同響度時(shí)改變特性的強度特性。</div><div> </div><div>工作原理：由傳聲器將聲音轉換成電信號，再由前置放大器變換阻抗，使傳聲器與衰減器匹配。放大器將輸出信號加到計權網(wǎng)絡(luò )，對信號進(jìn)行頻率計權（或外接濾波器），然后再經(jīng)衰減器及放大器將信號放大到一定的幅值，送到有效值檢波器（或外按電平記錄儀），在指示表頭上給出噪聲聲級的數值。</div><div> </div><div>聲級計的分類(lèi)：</div><div>1、按精度可分為精密聲級計和普通聲級計。精密聲級計的測量誤差約為土 1dB，普通聲級計約為土 3dB 。</div><div>2、按用途可分為兩類(lèi)：一類(lèi)用于測量穩態(tài)噪聲，一類(lèi)則用于測量不穩態(tài)噪聲和脈沖噪聲。</div><div>3、積分式聲級計是用來(lái)測量一段時(shí)間內不穩態(tài)噪聲的等效聲級的。噪聲劑量計也是一種積分式聲級計，主要用來(lái)測量噪聲暴露量。</div><div>4、脈沖式聲級計是用于測量脈沖噪聲的，這種聲級計符合人耳對脈沖聲的響應及人耳對脈沖聲反應的平均時(shí)間。</div></div> <div id="f9rdfrffl7j" class="dcont"></div> <div class="f9rdfrffl7j" id="news_sx"> <li id="f9rdfrffl7j" class="sx_left">上一篇：<a 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