| 摘要 |
The present invention provides an investigation device for investigating a sample of a solid, liquid or gaseous medium. The device has a transmission mechanism capable of sending several transmitted signals of different frequencies and a receiving mechanism for receiving received signals corresponding to the various transmitted signals. The device further includes a processing mechanism for determining the phase shi ft of each pair of transmitted and received signals and computationally determining a qualifying value for the sample. The processing mechanism determines the qualifying val ue based on a comparison of the determined phase shift values with comparison phase shift values from a comparison sample intended for the respective transmitter frequencies . By using the frequency-specific scanning of the sample at multiple frequencies, the resulting determination of the frequency-specific phase angle shifts provides a substantially more accurate investigation of the sample, including when a change in the sample can result in different effects on the respective frequency-specific transmitted signals.< /SDOAB>
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