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蓝宝石(单晶氧化铝)具有高达2050℃的熔点,而且在接近其熔点时仍能在可见光和近红外光区保持透明和不辐射.1984年,R.R.Dils研制的黑体式蓝宝石光纤高温计适用
Sapphire (single crystal alumina) has a melting point of up to 2050 ° C and remains transparent and non-radiative in the visible and near-infrared regions near its melting point. In 1984, the black body sapphire optical pyrometer developed by R.R. Dils was used