At this time, the gravitational potential energy of the Phone Number List iron ball was about 0.4 J. It was assumed that all the kinetic energy converted from Phone Number List the gravitational potential energy of the iron ball was absorbed by sample. Hence, the free fall of the iron ball striking the surface of the yellow peach caused mild damage to it (Li et Phone Number List al. 2021a). The bruise’s yellow peaches were stored at the room with the temperature of 24 °C and the relative humidity of 65%.
Then the hyperspectral images of Phone Number List samples were collected at 2 h, 8 h, 24 h and 48 h. Acquisition and correction of hyperspectral images The experimental data were collected by the Gaia hyperspectral sorter, whose composition Phone Number List structure schematic and collected 3D data cubes are shown in Fig. 1. The system hardware Phone Number List consists of an imaging spectrometer, four halogen lamps (20 W), displacement Phone Number List tages, and stepper motors. The software of Spectral View is used to obtain data. Fig. 1 figure 1 Schematic diagram of the hyperspectral imaging system Full size image Before image acquisition, the hyperspectral system needs to be turned on and it is preheated for 0.5 h to prevent extraneous Phone Number List factors from interfering with experimental results.
The parameters are: camera exposure Phone Number List time is 6 ms; the spectral resolution is 3.5 nm; the spectral range is 397.5–1014 nm; displacement platform movement speed is 2.5 m/s. Operation steps: 1. The sample is placed on the moving Phone Number List platform; 2. The moving platform is opened until the moving platform’s motion is finished, and Phone Number List then the save button is clicked; 3. A 3D data cube containing image information and spectral information is recorded by computer software.