method for locating an edge disposed at the intersection of two planar surfaces together.characterized in that it comprises the following steps: (a) broadcast from at least one emitter (e), (b) receiving the at least two receivers (r1)echo waves (r2) issued by the issuer (e), and (c) determined by the analysis of the energy of the signal received by each receiver (r1, r2), the value of the angle of inclination (. alpha..alpha.1.(2) (d) the calculation of the position of the main points of impact (s)(v) along the two surfaces by measuring the transit time of the signal emitted by the emitter (e) and received by a receiver (r1, r2).- (e) location of the edge of the calculation of (n) corresponding to the intersection of the straight lines passing through the two points of impact (s, v) and.alpha.1 respectively an angle (. alpha.(2) with the principal axis of emission of the emitter (e).
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