Strain-measuring device

G - Physics – 01 – B

Patent

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Details

G01B 7/16 (2006.01) G01L 1/22 (2006.01)

Patent

CA 2478960

The invention relates to a miniature, integrated strain-measuring device with a simple and economical design which can be mass produced at least cost and comprising reliable, reproducible and tamperproof settings. The inventive device can be quickly installed on the structure to be measured without the need for a specialist technician and without altering said structure. The device comprises a deformable element (20) which is mounted between two mounting posts (30, 40) which are intended to be fixed to a structure (1) to be measured, said deformable element (20) bearing strain gauges (61) which are connected to an electronic signal-conditioning circuit (70). The invention is characterised in that it comprises means of prestressing (80) the deformable element (20), said means being provided with at least one prestressing rod (81) which extends between the two mounting posts (30, 40). The aforementioned rod is designed to move the two mounting posts (30, 40) closer together in translation and to impose a prestressing curve on said deformable element (20). The above-mentioned prestressing means (80) also comprise a compensation member (85) which allows the two mounting posts (30, 40) to move in translation in relation to one another when the deformable element (20) is prestressed, such that measurements can be taken on the structure (1). The invention is suitable for any application requiring the measurement, inspection, detection or monitoring of deformation in structures, engineering works and mechanical parts, etc. which are subjected to stresses.

La présente invention concerne un dispositif de mesure extensométrique miniature et intégré, de conception simple et économique, pouvant être produit en série à moindre coût, dont les réglages sont fiables, reproductibles et indéréglables, pouvant être mis en place rapidement sur la structure à mesurer sans technicien spécialisé et sans modifier cette structure. Il comporte un élément déformable (20) monté entre deux plots de montage (30, 40) destinés à être fixés sur une structure (1) à mesurer, l'élément déformable (20) portant des jauges de contrainte (61) reliées à un circuit électronique de conditionnement (70) des signaux. Il est caractérisé en ce qu'il comporte des moyens de mise en précontrainte (80) de l'élément déformable (20) pourvus d'au moins une tige de précontrainte (81) s'étendant entre les deux plots de montage (30, 40) et agencée pour rapprocher ces deux plots de montage (30, 40) en translation et imposer une courbure de précontrainte audit élément déformable (20). Les moyens de mise en précontrainte (80) comportent également un organe de compensation (85) agencé pour autoriser un déplacement relatif en translation de ces deux plots de montage (30, 40) lorsque l'élément déformable (20) est précontraint, de manière à pouvoir réaliser des mesures sur ladite structure (1). Applications : Toute application nécessitant une mesure, un contrôle, une détection, une surveillance des déformations de structures, d'ouvrages, des pièces mécaniques, etc. soumis à des contraintes.

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