Design of Meat Product Safety Information Chain Traceability System Based on UHF RFID.

As a result of the current imperfection of the meat traceability system, there have been numerous food safety events with serious consequences. In this paper, a meat product information traceability system is designed to efficiently prevent such problems. This system develops an identification tag information reader based on ultra-high frequency (UHF) Radio Frequency Identification (RFID). It is compatible with LoRa wireless, USB serial port, RS485, and RJ45 Ethernet connection. Among them, the efficiency analysis of the Q-value algorithm finds that the recognition rate of the system reaches a maximum of about 0.367 when the number of tags n is about the frame length. The multi-tag anti-collision algorithm design based on the algorithm improves the efficiency of information collection in production and distribution links. The traceability code identification scheme is designed to effectively match various links, and the platform of system is built using LabVIEW2014 software, which has five sub-modules including user management, farm management, slaughter management, logistics management, and sales management. The system uses MySQL databases to store traceability information so that users can complete their queries by entering the traceability code on the system platform. The system not only has a low cost and a broad range of applications, but it also realizes the tracking record of meat product traceability information from breeding to selling, completes the function from information collection to information inquiry, and solves the problem of the incomplete traceability information chain. In addition, the system not only enhances the informational transparency of meat products in the product supply chain but also provides information for the regulatory authorities to effectively monitor safety.

[Based on Moire interference accurate detection of the laser center wavelength].

To improve spectrum resolution of the traditional Fourier interferometer with the same size lens, was proposed based on orthogonal wedge Fourier interferometer system. The interferometer system gets the optical path difference by the prism of two mutually perpendicular, which can make the laser Interferences on the CCD Array. The detector use the area array CCD linear array CCD, and the system collected the interference fringes on the two-dimensional plane. On the basis of the spectrum distribution of orthogonal inclination Moire interferometer by calculating optical path difference function, the system made the splicing of interference fringes on the area array CCD and Moire transform, finally got the spectrum resolution. The results from the MATLAB simulation software shows that the Maximum optical path difference of the orthogonal inclination Moire interferometer can be generated up to 234 microm, which is higher than the traditional Fourier interferometer about one order of magnitude, so the spectrum resolution also increased by nearly 10 times theoretical. Experimental calibration of the spectrometer with a selection of LAB SPAKR 750A-type spectrometer, measurements for the center wavelength of 635 nm semiconductor laser, the results show basically the same center wavelength position. However, the spectrum detected by orthogonal inclination Moire interferometer system near the center wavelength is better than the traditional interferometer system.