Method for nondestructive test of aliphatic acid content in wheat by using terahertz imaging

• Main Authors: LI JINLONG, LIAN FEIYU, GE HONGYI, JIANG YUYING, XU DEGANG, REN FANGTAO
• Format: Patent
• Language: Chinese; English
• Published: 14.08.2018
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for nondestructive test of aliphatic acid content in wheat by using terahertz imaging. The method comprises the following steps: wheat samples with storage time for 1year, 2 years, 3 years, 3.5 years and 4 years are subjected to reflection imaging measurement to obtain an terahertz image; the terahertz spectrums can be extracted from each pixel point in the terahertz image, the frequency points are averaged, an average spectrum signal is obtained, and SG convolution smoothing is employed for processing an average frequency domain power spectrum curve; the average frequency domain power spectrum curve employs a first-order derivative to enhance the characteristic difference of the spectrum data to obtain the characteristic wave band of wheat aliphatic acidcontent change; a multiple regression analysis method is used for establishing a wheat aliphatic acid quantitative determination multivariate linear regression model based on a full waveband and an extracted characteristic wav