Inductive pressure transducer

An inductive pressure transducer (1) includes a support structure (2, 3) in which are mounted

• a metal body (8) having a flat surface (8a) at one end and a cavity (8b) at the opposite end which is intended to be exposed to the fluid pressure to be transduced, and in which a thin wall (8c), resiliently deformable in the manner of a membrane under the effect of the pressure, is defined between the bottom of the cavity (8b) and the flat surface (8a);
• an inductor (10) comprising a body of ferromagnetic material (11) securely fixed to the metal body (8) and having a flat surface (11a) facing the said end surface (8a) of the metal body (8), and having an annular recess (12) defining a central core (13) with a winding (16) arranged therein and a surrounding sleeve (14);
• and
• a spacer ring (9) of paramagnetic or diamagnetic material, of calibrated thickness, interposed between the metal body (8) and the ferromagnetic body (11) in such a way that the distal end (13a) of the core (13) faces the central portion of the deformable wall (8c) of the metal body (8) at a calibrated distance therefrom to define an air gap;
• the arrangement being such that, as the pressure acting on the wall (8c) varies, the wall is deformed resiliently, varying the spacing of the air gap (17) between the wall (8c) and the core (13) and varying, correspondingly, the inductance measurable between the terminals of the inductor (10).