Surface acoustic wave device and method with integrated function of radio frequency identification and wireless sensing

Abstract

The invention discloses a surface acoustic wave device with the integrated function of radio frequency identification and wireless sensing and its working method. , two of the channels realize the integrated function of radio frequency identification and temperature sensing, and the other two channels realize the function of parallel sensing of two gases, which can be used for cold chain foods such as refrigeration and freezing or foods with clear temperature requirements. It can also be further used in modified atmosphere packaging food. Among multiple reflective gratings of the SAW device, the reference reflective grating is used to eliminate the influence of distance on the phase measurement results, and the temperature compensation reflective grating is used to compensate the influence of temperature on the phase measurement results. The present invention is characterized in that information traceability and quality inspection in the field of food safety can be realized simultaneously by only one passive device, and the function is easy to realize and has high cost performance.

Description

Technical field: [0001] The invention relates to a surface acoustic wave device with an integrated function of radio frequency identification and wireless sensing and a working method thereof, belonging to the fields of radio frequency identification and wireless sensing. Background technique: [0002] Information traceability and quality inspection are two indispensable aspects of food safety. The core of food information traceability is to emphasize the unique code of food. On the basis of the unique code, a series of information about food from the production base to the dining table is transformed into specific data and stored in the central database, and can be called, viewed, and retrieved in real time through the unique code. Aggregate and analyze all food data from farm to fork to realize traceability function. However, it is impossible to solve food safety problems only through traceability and accountability after the accident. More importantly, combined with sens...

AI Technical Summary

Problems solved by technology

[0006] (1) The existing food information traceability mainly uses barcode technology, which has problems such as short recognition distance, low recognition efficiency, and poor environmental adaptability

[0007] (2) The existing food quality inspection mainly adopts sampling inspection method, which cannot realize all-round real-time inspection of all foods, and some methods are destructive inspection, such as headspace gas used to detect gas concentration in modified atmosphere packaged food Analyzer, etc.

[0008] (3) In recent years, although the advanced smart packaging (Smart Packaging) technology can realize food information traceability and quality inspection at the same time, at present, the two technologies of radio frequency identification and wireless sensing are independent and perform their own duties. , system integration is more difficult and costly

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