The invention concerns a multimode optical fiber (2) impact sensor (1) extending along a path and having a sensitive portion (6) operating in accordance with the principle of coupling between the modes guided by the optical fiber (2), said sensor (1) comprising an optical source (14) arranged at a first end of the fiber (2) to inject a light signal therein, and an optical detection and processing circuit (10) for receiving and analyzing the light signal emitted by the optical source (14) and passing through the optical fiber (2), said circuit (10) being arranged at a second end of the fiber (2). Said sensor is characterized in that the optical fiber (2) has a diameter constriction (4) downstream of its sensitive portion (6).
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