A continuous wave metal object detection system comprising a transmitter assembly and a receiver assembly, wherein: - the transmitter assembly comprises at least one transmitter coil (Tx1,..., Txm) housed in a first column, a first clock configured to transmit a first electrical signal at a given first frequency F1, at least one first frequency generator configured to transmit to a corresponding transmitter coil (Tx1,..., Txm) an electrical signal having a frequency that is synchronized to the first frequency F1; and...,Txm) an electrical signal having a frequency that is synchronised to the first frequency F1 so that the transmitter coil (Tx1,...,Txm) emits a magnetic field; and - the receiver assembly comprises: * at least one receiver coil (Rx1,...,Rxn) housed in a second column, distinct from the first column, said receiver coil (R×1,...,R×n) being configured to produce an electric signal as a function of the magnetic field emitted by the transmitter coil (Tx1,...,Txm), a second clock configured to transmit a second signal at a second given frequency F2, and at least one second frequency generator configured to determine an electric signal having a frequency that is different from the first frequency.Txm), a second clock configured to transmit a second signal at a given second frequency F2, and at least one second frequency generator configured to determine an electrical signal having a frequency that is synchronised with the second frequency F2; and * a unit for comparing the electrical signal produced by the receiver winding (R×1,...,R×n) with the electrical signal determined by the second frequency generator; the detection system being characterised in that it further comprises: - a detector configured to detect a zero-crossing time of all electrical signals transmitted by the at least one first frequency generator or the at least one second frequency generator; - a signal generator configured to generate a phase realignment signal synchronised to the zero crossing time detected by the detector; and - transmission means comprising a wireless communication interface (41, 42) configured to transmit to the transmitter assembly or receiver assembly the phase realignment signal to realign the phase of the first clock and the second clock. - the transmitter assembly comprises at least one transmitter coil (Tx1,..., Txm) housed in a first column, a first clock configured to transmit a first electrical signal at a given first frequency F1, at least one first frequency generator configured to transmit to a corresponding transmitter coil (Tx1,..., Txm) an electrical signal having a frequency that is synchronized to the first frequency F1; and...,Txm) an electrical signal having a frequency that is synchronised to the first frequency F1 so that the transmitter coil (Tx1,...,Txm) emits a magnetic field; and - the receiver assembly comprises: * at least one receiver coil (Rx1,...,Rxn) housed in a second column, distinct from the first column, said receiver coil (R×1,...,R×n) being configured to produce an electric signal as a function of the magnetic field emitted by the transmitter coil (Tx1,...,Txm), a second clock configured to transmit a second signal at a second given frequency F2, and at least one second frequency generator configured to determine an electric signal having a frequency that is different from the first frequency.Txm), a second clock configured to transmit a second signal at a given second frequency F2, and at least one second frequency generator configured to determine an electrical signal having a frequency that is synchronised with the second frequency F2; and * a unit for comparing the electrical signal produced by the receiver winding (R×1,...,R×n) with the electrical signal determined by the second frequency generator; * at least one receiver coil (Rx1,...,Rxn) housed in a second column, distinct from the first column, said receiver coil (R×1,...,R×n) being configured to produce an electric signal as a function of the magnetic field emitted by the transmitter coil (Tx1,...,Txm), a second clock configured to transmit a second signal at a second given frequency F2, and at least one second frequency generator configured to determine an electric signal having a frequency that is different from the first frequency.Txm), a second clock configured to transmit a second signal at a given second frequency F2, and at least one second frequency generator configured to determine an electrical signal having a frequency that is synchronised with the second frequency F2; and * a unit for comparing the electrical signal produced by the receiver winding (R×1,...,R×n) with the electrical signal determined by the second frequency generator; - a detector configured to detect a zero-crossing time of all electrical signals transmitted by the at least one first frequency generator or the at least one second frequency generator; - a signal generator configured to generate a phase realignment signal synchronised to the zero crossing time detected by the detector; and - transmission means comprising a wireless communication interface (41, 42) configured to transmit to the transmitter assembly or receiver assembly the phase realignment signal to realign the phase of the first clock and the second clock.