FIELD: measurement equipment.
SUBSTANCE: use: to detect condition of underground part of reinforced concrete supports of a contact network. Substance consists in the fact that internal support oscillations are excited, acting at the support by an impact pulse in the zone of separation of underground and surface parts, and about condition of the underground part of the support they decide on dependence of frequencies and energies of oscillations on time from the produced spectrogram, comparing the spectrogram with reference spectrograms for critical defective, defective and normal supports of this type.
EFFECT: increased reliability and validity of controlling condition of underground part of supports.
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