日本碼控美MGL-50L-B先買先得

選型原則

要進(jìn)行—個(gè)具體的測量工作，首先要考慮采用何種原理的傳感器，這需要分析多方面的因素之后才能確定。因?yàn)椋词故菧y量同一物理量，也有多種原理的傳感器可供選用，哪一種原理的傳感器更為合適，則需要根據(jù)被測量的特點(diǎn)和傳感器的使用條件考慮以下一些具體問題：量程的大小；被測位置對傳感器體積的要求；測量方式為接觸式還是非接觸式；信號的引出方法，有線或是非接觸測量；傳感器的來源，國產(chǎn)還是進(jìn)口，價(jià)格能否承受，還是自行研制。 [6] 
在考慮上述問題之后就能確定選用何種類型的傳感器，然后再考慮傳感器的具體性能指標(biāo)。
靈敏度的選擇
通常，在傳感器的線性范圍內(nèi)，希望傳感器的靈敏度越高越好。因?yàn)橹挥徐`敏度高時(shí)，與被測量變化對應(yīng)的輸出信號的值才比較大，有利于信號處理。但要注意的是，傳感器的靈敏度高，與被測量無關(guān)的外界噪聲也容易混入，也會被放大系統(tǒng)放大，影響測量精度。因此，要求傳感器本身應(yīng)具有較高的信噪比，盡量減少從外界引入的干擾信號。
傳感器的靈敏度是有方向性的。當(dāng)被測量是單向量，而且對其方向性要求較高，則應(yīng)選擇其它方向靈敏度小的傳感器；如果被測量是多維向量，則要求傳感器的交叉靈敏度越小越好。
頻率響應(yīng)特性
傳感器的頻率響應(yīng)特性決定了被測量的頻率范圍，必須在允許頻率范圍內(nèi)保持不失真。實(shí)際上傳感器的響應(yīng)總有—定延遲，希望延遲時(shí)間越短越好。
傳感器的頻率響應(yīng)越高，可測的信號頻率范圍就越寬。
在動態(tài)測量中，應(yīng)根據(jù)信號的特點(diǎn)(穩(wěn)態(tài)、瞬態(tài)、隨機(jī)等)響應(yīng)特性，以免產(chǎn)生過大的誤差。
線性范圍
傳感器的線形范圍是指輸出與輸入成正比的范圍。以理論上講，在此范圍內(nèi)，靈敏度保持定值。傳感器的線性范圍越寬，則其量程越大，并且能保證一定的測量精度。在選擇傳感器時(shí)，當(dāng)傳感器的種類確定以后首先要看其量程是否滿足要求。
但實(shí)際上，任何傳感器都不能保證絕對的線性，其線性度也是相對的。當(dāng)所要求測量精度比較低時(shí)，在一定的范圍內(nèi)，可將非線性誤差較小的傳感器近似看作線性的，這會給測量帶來極大的方便。
穩(wěn)定性
傳感器使用一段時(shí)間后，其性能保持不變的能力稱為穩(wěn)定性。影響傳感器長期穩(wěn)定性的因素除傳感器本身結(jié)構(gòu)外，主要是傳感器的使用環(huán)境。因此，要使傳感器具有良好的穩(wěn)定性，傳感器必須要有較強(qiáng)的環(huán)境適應(yīng)能力。
在選擇傳感器之前，應(yīng)對其使用環(huán)境進(jìn)行調(diào)查，并根據(jù)具體的使用環(huán)境選擇合適的傳感器，或采取適當(dāng)?shù)拇胧�，減小環(huán)境的影響。
傳感器的穩(wěn)定性有定量指標(biāo)，在超過使用期后，在使用前應(yīng)重新進(jìn)行標(biāo)定，以確定傳感器的性能是否發(fā)生變化。
在某些要求傳感器能長期使用而又不能輕易更換或標(biāo)定的場合，所選用的傳感器穩(wěn)定性要求更嚴(yán)格，要能夠經(jīng)受住長時(shí)間的考驗(yàn)。
精度
精度是傳感器的一個(gè)重要的性能指標(biāo)，它是關(guān)系到整個(gè)測量系統(tǒng)測量精度的一個(gè)重要環(huán)節(jié)。傳感器的精度越高，其價(jià)格越昂貴，因此，傳感器的精度只要滿足整個(gè)測量系統(tǒng)的精度要求就可以，不必選得過高。這樣就可以在滿足同一測量目的的諸多傳感器中選擇比較便宜和簡單的傳感器阿特拉斯空壓機(jī)配件。
如果測量目的是定性分析的，選用重復(fù)精度高的傳感器即可，不宜選用絕對量值精度高的；如果是為了定量分析，必須獲得精確的測量值，就需選用精度等級能滿足要求的傳感器。
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