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Design of microstrip moisture sensor for determination of moisture content in rice with improved mean relative error
Author(s) -
Jain Sweety,
Mishra Pankaj Kumar,
Thakare Vandana Vikas,
Mishra Jyoti
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31763
Subject(s) - water content , microstrip , materials science , relative permittivity , microwave , approximation error , bulk density , permittivity , correlation coefficient , composite material , mathematics , dielectric , optoelectronics , optics , environmental science , soil science , telecommunications , physics , statistics , engineering , geotechnical engineering , soil water
Abstract Microstrip patch sensor was designed for resonant frequency ( f r ) 8.1 GHz, printed on FR4 material thickness of 1.676 mm, and relative permittivity was 4.4. For simulation, CST Microwave Studio was used. The aim was to measure the moisture content (MC) of basmati rice whose various properties were longest average rice length (L) 7.2 mm, average width (W) 1.61 mm, L/W ratio 4.47, and bulk density was varied from 554.3 to 591 kg/m 3 (bulk density was increase with increase of MC). For checking the working performance of design sensor, predicted moisture content (PMC) and actual moisture content (AMC) were compared. In the former case, reflection coefficient of overlaid rice was measured from vector network analyzer; PMC obtained was varied from 10.53% to 21.67%. In latter case, AMC was varied from 10.71% to 21.87%. Therefore, the lowest mean relative error (MRE) was 1.86% at 8.1 GHz. Hence, the proposed sensor was found to be more accurate than previous designs.