Sapphire has excellent optical and mechanical properties that allow it to be used from the UV to IR ranges giving it an advantage over other optical materials. Sapphire is used for its durability and erosion/corrosion resistance, often in combination with the ability to withstand high heat. 

Some of the devices in aeronautical applications that use synthetic ruby jewels include:

Gyroscopes: Synthetic rubies are commonly used as bearings in gyroscopes. Gyroscopes are used in aircraft to measure angular velocity and orientation.

Typical Applications: 

Viewports 

FLIR (Forward Looking Infrared) Systems 

Infrared Countermeasure Lamps 

Salt Sand Blowing Environments 

Fire Flame Sensors for Aircraft 

Vibration Sensors 

Instrumentation Aircraft Gauges

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