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能斯特發光體

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95V 0.5A 直流能斯特灯,现藏于德国曼海姆國家勞動和技術博物館

能斯特發光體(英語:Nernst glower)是一種舊式的白熾燈,它由瓦爾特·能斯特发明,可以提供光譜學所需的近紅外線連續光源。能斯特發光體的外型通常被製造成圓柱體棒狀或管狀,由二氧化鋯(ZrO2)、氧化釔(Y2O3)、氧化铒(Er2O3)三種化合物混合而成的氧化物混合物大概重量以90:7:3的比例製作。能斯特發光體須以電力加熱至2000 °C始得運作,且加熱過程剛開始需要外部熱源加熱,不能直接通電產生電流熱效應,因為在室溫下這種材料是絕緣體

能斯特發光體後來被一種稱為格羅棒英语Globar碳化矽(SiC)電熱棒取代,兩者運作原理類似。差別在於,格羅棒在1100 °C就能運作,而且不需要任何初始加熱器,因為它本身在各種溫度下都是導體。格羅棒也比能斯特發光體更適合用於疏散避難系統。

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能斯特發光體
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