140ARI03010C

140ARI03010C

140ARI03010C

　式中，T為被測物體的真實溫度；T_F被測物體的輻射溫度；ε_T為被測物體的全發(fā)射率。

　　由于0<ε_T<1，所以，輻射溫度ε_T總要低于物體的真實溫度，現(xiàn)將一些常用材料在給定溫度范圍內(nèi)的全發(fā)射率列于表1中，供參考。

 

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　　值得注意的是，ε_T與光譜發(fā)射率ε_λ一樣，涉及的因素很多，它隨物體的化學(xué)成分、表面狀態(tài)、溫度及輻射條件的不同而改變。例如金屬鎳，在1000～1 400℃范圍內(nèi)，<ε_T＝0.056～0.069；在類似溫度范圍內(nèi)氧化鎳的<ε_T卻為0．54～0.87，大致相差一個數(shù)量級。又如磨光的鉑在260～538℃范圍內(nèi)，<ε_T＝0.06～0.10；而在完全相同的溫度范圍內(nèi)，鉑黑的
高達0.96～0.97。由此可見，被測物體的化學(xué)成分或表面狀態(tài)的差異，均可能造成<ε_T的很大變化。

　　輻射溫度計的敏感元件，分光電型與熱敏型兩大類

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