Method for rapidly predicting freezer storage time of frozen pork based on reflectance ratio of two near-infrared bands

A method for rapidly predicting freezer storage time of frozen pork based on reflectance ratio of two near-infrared bands, characterized in that, it comprises the steps of:

• (1) scanning frozen pork and calibrating to obtain near-infrared spectrum of the frozen pork;
• (2) calculating a center value Rm1350 of a band centered on a 1350 nm characteristic peak, a center value Rm1980 of a band centered on a 1890 nm characteristic peak and a center value Rm1500 of a band centered on a 1500 nm reference peak in the near-infrared spectrum of the frozen pork:
• Rm1350=R1348×0.1+R1349×0.2+R1350×0.4+R1351×0.2+R1352×0.1
• Rm1890=R1888×0.1+R1889×0.2+R1890×0.4+R1891×0.2+R1892×0.1
• Rm1500=R1498×0.1+R1499×0.2+R1500×0.4+R1551×0.2+R1552×0.1
• wherein R1348, R1349, R1350, R1351, R1352, R1888, R1889, R1890, R1891, R1892, R1498, R1499, R1500, R1551, R1552 are reflectance of the frozen pork at 1348 nm, 1349 nm, 1350 nm, 1351 nm, 1352 nm, 1888 nm, 1889 nm, 1890 nm, 1891 nm, 1892 nm, 1498 nm, 1499 nm, 1500 nm, 1501 nm, 1502 nm, respectively;
• (3) calculating a standard center value Sm1890 of the characteristic band centered on 1890 nm:
• Sm1890=Rm1890/Rm1500
• (4) treating the ratio of Rm1350 to Sm1890 as an eigenvector I, wherein I=Rm1350/Sm1890;
• (5) substituting the eigenvector I into a characteristic exponential function t=1E+07e−97.34I which is based on the eigenvector I and freezer storage time t, so as to predict the freezer storage time of the frozen pork.