ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A miniaturized microstrip ring resonator (MRR) 1 in.×1 in. resonating at fro=10.27 GHz was used as a nondestructive moisture sensor for chickpea kernels (Cicer arietinum L.) for ease in loading and unloading. The change in the resonant frequency (Δfr) of the MRR is a measure of the amount of moisture in the overlaid kernel. The percentage of moisture (M) was varied from 0% (dry) to ∼50% (fully soaked) calculated on a wet weight basis. Δfr increased with M, although not linearly. Three regions were observed in the sensitivity curve. The first region extended from 0%–12%, the central region from 12%–43%, and the saturation region from 43%–50% in moisture content. In the central region the observed Δfr was 574 MHz, whereas in the first and third regions it was 44 and 55 MHz, respectively. The regions in the sensitivity curves indicate different dominant phenomena. A small scatter was observed in the first region, which increased with the increasing percent of moisture content. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1149877
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