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    • 2. 发明授权
    • Optical lens and method of preventing clouding thereof at high
temperatures
    • 光学透镜及其在高温下防止其混浊的方法
    • US6014263A
    • 2000-01-11
    • US71109
    • 1998-05-04
    • Jon C. SchaefferNripendra N. DasBrian F. MickleChing-Ho WangMatthew S. TomaszewskiKevin G. McAllister
    • Jon C. SchaefferNripendra N. DasBrian F. MickleChing-Ho WangMatthew S. TomaszewskiKevin G. McAllister
    • G02B1/10G02B27/00G02B3/00
    • G02B27/0006G02B1/105
    • A method for preventing clouding of a lens employed in a high-temperature oxidizing environment, an example of which is a lens of a pyrometer used to sense exhaust gas temperature (EGT) of a gas turbine engine. Clouding is prevented by inhibiting the generation of volatile oxide species that react with high-temperature lens materials, forming deposits including oxides of chromium, molybdenum and other elements having volatile oxide species. The method is particularly directed to a pyrometer whose lens is formed of sapphire (alumina) or silica, and is mounted within a structure formed of a material containing chromium and/or molybdenum, such as a superalloy or stainless steel. The method entails forming an alumina scale-forming barrier coating such as a diffusion aluminide on surfaces of the structure that are subject to oxidation and high temperatures. According to the invention, the alumina scale formed by the barrier coating inhibits the generation of other oxides at the coated surfaces, which would otherwise form volatile oxides that react with and form deposit on the lens. By inhibiting the formation of oxides other than alumina on surfaces surrounding the lens, lens clouding caused from volatile oxides is avoided. As a result, the optical performance of the lens is not degraded, and the precision of a pyrometer employing the lens to sense temperatures is maintained during operation of the engine.
    • 一种用于防止在高温氧化环境中使用的透镜的混浊的方法,其实例是用于感测燃气涡轮发动机的排气温度(EGT)的高温计的透镜。 通过抑制与高温透镜材料反应的挥发性氧化物物质的产生,形成含有铬,钼和其它具有挥发性氧化物的元素的沉积物来防止云层。 该方法特别涉及其透镜由蓝宝石(氧化铝)或二氧化硅形成的高温计,并且安装在由含有铬和/或钼的材料(例如超级合金或不锈钢)形成的结构内。 该方法需要在经受氧化和高温的结构的表面上形成氧化铝垢形成阻挡涂层,例如扩散铝化物。 根据本发明,通过阻挡涂层形成的氧化铝垢阻止了在涂覆表面产生其它氧化物,否则其将形成与透镜反应并形成沉积在透镜上的挥发性氧化物。 通过抑制在透镜周围的表面上形成氧化铝以外的氧化物,避免了由挥发性氧化物引起的透镜混浊。 结果,透镜的光学性能不降低,并且在发动机的操作期间保持采用透镜感测温度的高温计的精度。