This paper introduces a microwave measurement setup, using
three microstrip antennas integrated with a microwave oscillator, and
Schottky-diode detectors used as bistatic microwave sensors.
We have measured the microwave attenuation (water content)
and the bistatic radar cross section (dimensions) of eggs having different
storage times (Fig. 1). The measured attenuation (A) for fresh egg, at a frequency of 14.2 GHz is A=8–10 dB; the variation with time
is dA [dB]=−0.033T (days), thus
nearly −1 dB/30 days.
Our next project is to create a microwave device for the
automatic selection of old eggs. The basic experimental design and the results
of our measurements are discussed.
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