IR micro-imaging technology is a new kind of analytical technology, which combines direct-visualizing image and infrared spectroscopy analysis. Each pixel in the IR micro-image is a whole IR spectrum, therefore, IR micro-image contains not only the information of spatial distribution but also the information of spectrum with hundreds of wavelength points. In this study, the feasibility of using IR micro-imaging to detect cypermethrin on the surface of apple skin was discussed, both cypermethrin single substance powder and the apple skin that was sprayed with cypermethrin single substance solution were used as research objects, IR micro-image and infrared spectrum were all analyzed. The results showed that IR micro-image of cypermethrin single substance powder could effectively reflect the information of spatial distribution, and the characteristic peak corresponding to molecular structure of cypermethrin could also be observed in the IR spectrum which extracted from IR micro-image of cypermethrin single substance powder. In the infrared spectrum of the apple skin that sprayed with cypermethrin single substance solution, four characteristic absorption peaks corresponding to cypermethrin which were located at 1591 cm-1, 1489 cm-1, 1290 cm-1and 801 cm-1were observed, which confirmed that there was cypermethrin existed on the apple skin. The present study indicated that the detection of cypermethrin on the surface of apply by IR micro-imaging technology was feasible, which provided a good foundation for the detection of fruit and vegetable pesticide residues by IR micro-imaging technology.

MIR/NIR micro-imaging can supply not only the spectra information but also the spacial distribution information, which is superior to the traditional MIR/NIR spectroscopy analysis. The definition of near/min-infrared micro-imaging is one of the important factors which will influence the correctness of imaging result. In this thesis, two kinds of plastic film which were similar to each other in appearance were regarded as the research object, of which the MIR and NIR micro-images were collected. The raw compare correlation images, 2ndderivative compare correlation images, raw chemimap images and 2ndderivative chemimap images of the MIR/NIR micro-images of the two materials were studied respectively. The result indicated that not only can the preprocessing of 2ndderivative enhance the discrimination of the spectra so as to enhance the image feature but also eliminate the nonuniformity of the compare correlation images. Both the MIR and NIR chemimap images will be inverted after the preprocessing of 2ndderivative. This study will, to some extent, provide some reference to the manufacturing process quality inspection and control and rapid discrimination of the safety of agricultural products and food packaging and the imaging methods of MIR/NIR micro-image.