Study on rapid detection method for fresh corn moisture content based on principle of SWR
LI Su-le · Transducer and Microsystem Technologies · 2014
Taking fresh corn as research object,research a kind of method for rapid detection of corn moisture content based on principle of standing wave ratio( SWR),use 100 MHz sine wave as test signal,the sensing probe is designed to have two parallel needles with 8 mm spacing that are 10 mm in length,0. 7 mm in diameter,and the length of transmission line is 37 cm long. Through fitting of voltages difference measured by repeated experiment and the corresponding actual corn moisture contents,better linear curve is obtained,whose correlation coefficient is 0. 906 2,and non-linearity error is ± 1. 519 %,and the stability of the obtained linear model is verified through further experiments. The results show that average error of this linear model is about- 1. 15 %,and the maximum error is no more than ± 3 %. So the conclusion can be drawn that the method model for rapid detection of corn moisture content based on SWR is feasible,and its linearity and error is within reasonable scope.