| 摘要 |
An apparatus (10) for analysing geological features comprises a receiver (20) for measuring a magnetic field received from adjacent geological featur es (18) excited by a periodic transmitted electromagnetic signal, wherein th e measured magnetic field is a scalar amplitude of the magnetic field or a s calar amplitude of the magnetic field is derivable from the measured magneti c field, wherein the receiver generates a received signal from the measured magnetic field; and a processor (28) for filtering unwanted signal component s which are substantially synchronous with the periodic transmitted electrom agnetic signal from the scalar amplitude of the received signal or the scala r amplitude derived from the received signal, such that target geological fe atures are able to be analysed using the filtered scalar amplitude.
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