TRIBOLUMINESCENT MATERIALS FOR OPTICAL DAMAGE SENSORS.
Triboluminescent materials possess the property of fracture induced light emission. A triboluminescent material embedded in, or attached on a composite structure could act as a real time optical damage sensor. The occurrence and severity of the damage is given by the intensity of the resulting triboluminescent light. An array of triboluminescent sensors may allow real time damage location monitoring simply by determining the wavelength of the emitted light. In this paper we have successfully synthesized a triboluminescent material europium tetrakis (Dibenzoylmethide)-triethylammonium. A solution of 2 mmoles of anhydrous europium chloride in 10 ml of ethyl alcohol is added to a hot solution of 8 mmoles of dibenzoylmethane and 8 mmoles of triethylamine in 60 ml of absolute ethyl alcohol. The mixture is allowed to cool and crystals are collected by filtration under suction. This material shows intense triboluminescent properties and showed an emission peak at 620 nm using a slit width of 250 [micro]m. This mater ial can possibly be used in designing smart optical damage sensors for defense applications.
(*.) Work was supported under NASA grants NAG8-l708 and NAG8-1623
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|Author:||Gebre, T.; Bhat, K.; Owens, C.; Aggarwal, M.D.|
|Publication:||Journal of the Alabama Academy of Science|
|Article Type:||Brief Article|
|Date:||Apr 1, 2001|
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