Essentially thickness independent single layer photoelastic...

Details Essentially thickness independent single layer photoelastic... Essentially thickness independent single layer photoelastic...

G - Physics

01

B

G01B 11/16 (2006.01) G01L 1/24 (2006.01)

Patent

CA 2599175

An essentially thickness independent luminescent photoelastic coating consists of a single layer of a photoelastic material in which a polarizing preserving luminescent dye, (1), and an excitation absorption dye, (2), are contained therein. The absorption dye limits a penetration depth, (3), of incident radiation, (4). The thickness of the coating is greater than a penetration depth of the excitation radiation. The coating is used to determine strain on an underlying substrate, (5), on which the coating is adhered by measurement and analysis of the emission intensities and patterns from the luminescent dye in the coating upon irradiation at a distinct excitation radiation.

L'invention concerne un revêtement photoélastique luminescent essentiellement indépendant de l'épaisseur, comprenant une couche unique d'un matériau photoélastique qui renferme une teinture conservant sa luminescence sous polarisation (1), et une couche d'absorption de signal d'excitation (2). La teinture d'absorption limite la profondeur de pénétration (3) d'un rayonnement incident (4). L'épaisseur du revêtement est supérieure à la profondeur de pénétration du rayonnement d'excitation. Le revêtement sert à déterminer la contrainte imposée à un substrat (5) sur lequel il est collé. A cette fin, on mesure et on analyse les intensités et les schémas d'émission provenant de la teinture luminescente par suite d'un rayonnement d'excitation distinct.

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