The inductive sensor (1) emits a signal intended to trigger the ignition device of an internal combustion engine. The sensor consists of a stator (8) incorporating tooth-like pole pieces (9) distributed around its edge, and a rotor (10) concentric with the stator also incorporating tooth-like pole pieces (11) which move past those of the stator when the rotor is driven in rotation. The rotor and stator belong to a magnetic circuit and the rotation of the rotor causes a variation of the flux in a coil which, by induction, creates signals at the terminals of the coil. The sensor (1) includes means (C), preferably in the form of teeth (9, 11), for compensating the variation in the reluctance of the substantially circumferential air gap (16) between the teeth (9, 11) resulting from the relative movement of these teeth along a direction ( DELTA ) substantially parallel to the axis of rotation. IMAGE
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