Method for detecting discontinuities in a medium, this method being implemented using a probe comprising a plurality of transducers forming an active surface and able to transmit and receive an ultrasonic wave in the medium, and the method comprising the steps of: - defining a transmission sequence wherein: a plurality of transmit transducers are chosen among the transducers of the probe, each transmit transducer of the plurality of transmit transducers having a determined spatial position such that the spatial positions of the plurality of transmit transducers are uniformly and randomly distributed over the active surface of the probe, and a time offset is defined for each transmit transducer of the plurality of transmit transducers, such that the time offsets of the plurality of transmit transducers are uniformly and randomly distributed over a predetermined transmission duration, - transmitting the transmission sequence in the medium, by the plurality of transmit transducers, - receiving and recording reception signals, by the plurality of transducers, in response to the transmission sequence transmitted in the medium, - processing the reception signals according to the following process, wherein: for each transmit transducer, a focusing delay corresponding to a determined focal law for the transmit transducer is calculated, for a desired target point to be probed in the medium, and taking into account the time offset of the transmit transducer considered, a focused signal is calculated for each transmit transducer, which is the sum of the reception signals of the plurality of transducers of the probe, realigned by the focusing delay, a synthetic signal is calculated which is the sum of the focused signals from all the transmit transducers, and the synthetic signal is analyzed in order to thus derive a level of detection in the medium at the target point, and detection of a discontinuity is thus derived. - defining a transmission sequence wherein: a plurality of transmit transducers are chosen among the transducers of the probe, each transmit transducer of the plurality of transmit transducers having a determined spatial position such that the spatial positions of the plurality of transmit transducers are uniformly and randomly distributed over the active surface of the probe, and a time offset is defined for each transmit transducer of the plurality of transmit transducers, such that the time offsets of the plurality of transmit transducers are uniformly and randomly distributed over a predetermined transmission duration, a plurality of transmit transducers are chosen among the transducers of the probe, each transmit transducer of the plurality of transmit transducers having a determined spatial position such that the spatial positions of the plurality of transmit transducers are uniformly and randomly distributed over the active surface of the probe, and a time offset is defined for each transmit transducer of the plurality of transmit transducers, such that the time offsets of the plurality of transmit transducers are uniformly and randomly distributed over a predetermined transmission duration, - transmitting the transmission sequence in the medium, by the plurality of transmit transducers, - receiving and recording reception signals, by the plurality of transducers, in response to the transmission sequence transmitted in the medium, - processing the reception signals according to the following process, wherein: for each transmit transducer, a focusing delay corresponding to a determined focal law for the transmit transducer is calculated, for a desired target point to be probed in the medium, and taking into account the time offset of the transmit transducer considered, a focused signal is calculated for each transmit transducer, which is the sum of the reception signals of the plurality of transducers of the probe, realigned by the focusing delay, a synthetic signal is calculated which is the sum of the focused signals from all the transmit transducers, and the synthetic signal is analyzed in order to thus derive a level of detection in the medium at the target point, and detection of a discontinuity is thus derived. for each transmit transducer, a focusing delay corresponding to a determined focal law for the transmit transducer is calculated, for a desired target point to be probed in the medium, and taking into account the time offset of the transmit transducer considered, a focused signal is calculated for each transmit transducer, which is the sum of the reception signals of the plurality of transducers of the probe, realigned by the focusing delay, a synthetic signal is calculated which is the sum of the focused signals from all the transmit transducers, and the synthetic signal is analyzed in order to thus derive a level of detection in the medium at the target point, and detection of a discontinuity is thus derived.