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normal;">“</strong>準確<strong style="white-space: normal;">”</strong>？</strong></p><p> 在很多情況下，漢語(yǔ)中<strong style="white-space: normal;">“</strong>準確度<strong style="white-space: normal;">”</strong>和<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong>這兩個(gè)概念會(huì )合二為一，統稱(chēng)<strong style="white-space: normal;">“</strong>精準度<strong style="white-space: normal;">”</strong>。對應的英文是<strong style="white-space: normal;">“</strong>Accuracy<strong style="white-space: normal;">”</strong>和<strong style="white-space: normal;">“</strong>Precision<strong style="white-space: normal;">”</strong>。實(shí)際上，這是表征儀器性能的兩個(gè)截然不同的概念。<br/><strong>1.1</strong><strong>正確理解這兩個(gè)參數 </strong></p><table border="0" cellpadding="1" cellspacing="10" style="width:700px;"><tbody> <tr class="firstRow"> <td style="word-break: break-all;"> <p><br/> 從右圖可知，Accuracy<strong style="white-space: normal;">“</strong>準確度<strong style="white-space: normal;">”</strong>是反映測量值和真實(shí)值接近程度的一個(gè)指標，是儀器測量準確性的標尺；Precision<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong>反映的是測量的重復性好不好，即多次測量數據之間的離散程度。如圖2所示，靶心代表真實(shí)值，D的測量結果最優(yōu)，因為其<strong style="white-space: normal;">“</strong>準確度<strong style="white-space: normal;">”</strong>和<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong>都是最好，A最差；B和C相比較，B的 <strong style="white-space: normal;">“</strong>準確度<strong style="white-space: normal;">”</strong>高，而<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong>低，C正好相反，<strong style="white-space: normal;">“</strong>準確度<strong style="white-space: normal;">”</strong>低，而<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong>高。所以，我們在選儀器時(shí)，肯定希望選擇<strong style="white-space: normal;">“</strong>準確度<strong style="white-space: normal;">”</strong>和<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong>都高的儀器設備。</p> </td> <td> <p> </p> </td> <td> <p> </p> </td> <td> <p><img alt="精度準確度" src="http://www.juicygoddess.com/uploads/6f506bf154cdca0dab964f47402a6f06/uploadfile/2016/1124/20161124013919175.jpg" style="width: 200px; height: 205px;"/></p> </td> </tr></tbody></table><p><strong>1.2 </strong><strong>比較不同廠(chǎng)家儀器的技術(shù)參數時(shí)，要注意什么？</strong><br/><br/> 從上面的分析可知，<strong>Accuracy<strong style="white-space: normal;">“</strong>準確度<strong style="white-space: normal;">”</strong>和Precision<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong></strong>是兩個(gè)完全不同的技術(shù)參數，但是，并不是所有的儀器都會(huì )明確標注。秉承著(zhù)專(zhuān)業(yè)的態(tài)度，LI-COR給出了有關(guān)這兩個(gè)參數的詳盡說(shuō)明<span style="color: rgb(128, 128, 128);">(table 1)</span>。</p><p style="text-align: center;"><img alt="如何理解光合作用測量系統的性能指標" src="http://www.juicygoddess.com/uploads/6f506bf154cdca0dab964f47402a6f06/uploadfile/2016/1124/20161124022838931.png" style="width: 300px; height: 310px;"/></p><p><strong>2 Accuracy<strong style="white-space: normal;">“</strong></strong><strong>準確度<strong style="white-space: normal;">”</strong>和Precision<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong>的計算方法，很重要嗎？</strong><br/> <br/> 兩臺不同廠(chǎng)家的儀器，從技術(shù)參數看，其數值可能是一樣的。但是，如果參數的計算方法不同，即使最終的數值一樣，其儀器的實(shí)際性能也會(huì )存在較大差別。<br/><br/> 以Precision<strong style="white-space: normal;">“</strong>精度<strong style="white-space: normal;">”</strong>為例，LI-COR采用均方根RMS的形式來(lái)呈現。如<span style="color:#808080;">(table 2)</span>，CO<sub>2</sub>的分析器精度，是在標氣濃度為400μmol/mol的條件下，儀器使用1Hz的采集頻率，把4s采集的數據信號平均后獲得的。這樣0.1μmol/mol RMS的整個(gè)計算方式得以清晰、完整展現；而右側的RMS是怎么計算得到？</p><p style="text-align: center;"><img alt="如何理解光合作用測量系統的性能指標" src="http://www.juicygoddess.com/uploads/6f506bf154cdca0dab964f47402a6f06/uploadfile/2016/1124/20161124023121327.png" style="width: 300px; height: 170px;"/></p><p><strong>3 </strong><strong>相關(guān)數據怎樣參與了計算過(guò)程？</strong></p><p> 儀器以怎樣的頻率采集的數據？多長(cháng)時(shí)間的原始數據被用于計算均值？不同采集頻率獲取的數據以及之后的計算方法最終都會(huì )影響參數數值本身。<br/><br/> 如以信號平均時(shí)間為例。信號平均時(shí)間的長(cháng)短會(huì )直接影響一個(gè)參數的大小。如果信號平均的時(shí)間不同，即使是同一臺儀器，得到的精度值大小也是完全不同，如<span style="color:#808080;">(Figure 2;Table 3)</span>。</p><p style="text-align: center;"><img alt="如何理解光合作用測量系統的性能指標" src="http://www.juicygoddess.com/uploads/6f506bf154cdca0dab964f47402a6f06/uploadfile/2016/1124/20161124023439197.png" style="width: 300px; height: 394px;"/></p><p style="text-align: center;"><img alt="如何理解光合作用測量系統的性能指標" src="http://www.juicygoddess.com/uploads/6f506bf154cdca0dab964f47402a6f06/uploadfile/2016/1124/20161124023613829.png" style="width: 300px; height: 166px;"/></p><p><strong>4 </strong><strong>技術(shù)參數是用國際標準單位表示的嗎？</strong><br/><br/> 用不同單位表示的參數在進(jìn)行比較時(shí)需要進(jìn)行數據轉換。有時(shí)，如果沒(méi)有附加信息，單位之間的轉換是很困難的。</p><p> 以L(fǎng)I-6800的H<sub>2</sub>O測量精度參數為例，其單位為mmol·mol<sup>-1</sup>，與國際標準一致，其他儀器很方便與之比較。而右側的儀器參數，首先需要我們弄懂它是什么含義。</p><p style="text-align: center;"><img alt="如何理解光合作用測量系統的性能指標" src="http://www.juicygoddess.com/uploads/6f506bf154cdca0dab964f47402a6f06/uploadfile/2016/1124/20161124023843491.png" style="width: 400px; height: 171px;"/></p><p>寫(xiě)在最后：當我們今后再看到儀器的性能指標時(shí)，將不再只是看到數字表面的信息。對技術(shù)參數的理解越深刻，就越能幫助我們挑選出性能優(yōu)異的儀器產(chǎn)品。<br/><br/><br/></p><p> </p><p> </p> </article>   <div id="xn757vvl9bvt" class="info_back"><a href="http://www.juicygoddess.com/home/show/78/2/list_article" id="columnid">【返回列表】</a></div> <div id="xn757vvl9bvt" class="info_pn"> <span id="xn757vvl9bvt" class="dot"> <a href="http://www.juicygoddess.com/home/article_detail/682"> 上一篇：有對OJIP、電子傳遞、碳反應三個(gè)階段量化評估的一體機嗎？ </a> </span> <span id="xn757vvl9bvt" class="dot"> <a href="http://www.juicygoddess.com/home/article_detail/814"> 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