| 摘要 |
A method of determining a relative permittivity (epsir) of concrete including providing a radar apparatus to be positioned on a concrete mass and having a transmitting antenna (2) for emitting a radar wave into the concrete mass and a receiving antenna (3) for detecting a cross-signal generated by the radar wave emitted into the concrete mass by the transmitting antenna, electronically processing the cross-signal, and determining the relative permittivity (epsir) by determining, with an algorithm, a frequency-dependent amplitude shifting in a spectrum of a signal section with in a predetermined time slot (t1); and using the so determined permittivitiy for depth scaling and determining presence of foreign bodies.
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