An inductive pressure transducer

Details An inductive pressure transducer An inductive pressure transducer

G - Physics

01

L

G01L 7/08 (2006.01)

Patent

CA 2354262

The transducer (1) includes a support struc-ture (2, 3) in which a metal body (8) is mounted, having a flat surface (8a) and on the opposite side a cavity (8b) for exposure to a pressure to be trans-duced. A thin wall (8c), resiliently deformable like a membrane under the effect of the pressure, is de-fined between the bottom of the cavity (8b) and the said flat surface (8a). An inductor (10) comprising a body of ferromagnetic material (11) is securely fixed to the metal body (8) and has a flat surface (11a) facing the flat surface (8a) of the metal body (8) and an annular recess (12) which defines a cen-tral core (13) with a winding (16) arranged therein and a surrounding sleeve (14). A spacer ring (9) of paramagnetic or diamagnetic material, and of cal-ibrated thickness, is interposed between the metal body (8) and the ferromagnetic body (11).

Le capteur (1) comprend une structure de support (2, 3) dans laquelle est monté un corps métallique (8), qui comporte une surface plane (8a) et sur la face opposée une cavité (8b) destinée à être exposée à une pression à capter. Une paroi mince (8c), déformable par résilience comme une membrane sous l'effet de la pression, se trouve entre la partie inférieure de la cavité (8b) et ladite surface plane (8a). Un inducteur (10) comprenant un corps en matériau ferromagnétique (11) est fixé solidement au corps métallique (8), et a une surface plane (11a) opposée à la surface plane (8a) du corps métallique (8) ainsi qu'un évidement annulaire (12) qui représente un noyau central (13) comportant un enroulement (16) et une gaine isolante (14) extérieure. Une bague d'insertion (9) en matériau paramagnétique ou diamagnétique, et d'une épaisseur calibrée, est interposée entre le corps métallique (8) et le corps ferromagnétique (11).

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