Study Of Rapid Measurement For Corn Moisture Content By Using Acoustic Wave

Title: Study of Rapid Measurement for Corn Moisture Content by Using Acoustic WaveMajor: Food scienceSupervisor: Professor Yonghai Sun, Jilin UniversityIn appraising corn quality, the moisture content of corn is a basic item. Cornmoisture measurement has very important meaning for corn storage, production,purchase, selling and so on. Therefore people come to find new methods, whichcan fatly, accurately, cheaply measure corn moisture. Corn acoustics property wasused to measure corn moisture content in this paper. The main contents are asfollows:1. Bringing up the experiment project. The paper summarized the presentdomestic and international major methods of corn moisture measurement.According to their research results, the paper mentioned new rapid method by cornacoustic wave, designed the experiment project and analyzed the feasibility.2. Determining experiment parameters. In the corn kernel impactingexperiment, the paper made sure three parameters that directly influenced for theexperiment result. The parameters are the corn quality taken to use ( m ), thedistance between funnel and plate ( D₁), the distance between sound sensor andsound source ( D₂ ). The three parameters have consanguineous relation with cornkernel impacting acoustic power: the relation between the corn quality m and theacoustic power is binomial curve, the equation is y = -3.08m² + 20.79m -7.27 , theacoustic power increases as the corn quality m increases; the relation betweenD₁ and the acoustic power is linearity, the equation is y = 37.06D₁ -19.77, theacoustic power increases as D₁ increases; the relation between D₂ and theacoustic power is binomial curve, the equation is y = 4.01D₂² -14.24D₂ +18.63,the acoustic power decreases as D₂ increases. According to experiment experienceand actual requirement, the paper determined corn quality m for 15 g, thedistance between funnel and plate ( D₁) for 30 cm, the distance between soundsensor and sound source ( D₂ ) for 10 cm.3. Collecting and filtering sound signals. The experiments include two parts:the corn kernel impacting experiment and the corn kernel crashing experiment.Sound card, sound sensor and computer form signal collection system. Thecollection frequency is 16000 Hz. Because the sound signals contained plenty ofnoises, therefore the paper filtered noise from the sound signals. The paper adopted...