SAW (surface acoustic wave)-based passive temperature tag and SAW-based passive temperature tag reader

Abstract

The invention discloses a SAW (surface acoustic wave)-based passive temperature tag which comprises a substrate, an interdigital transducer, a tag antenna, a temperature reflecting grating and an ID (identification)-tag reflecting grating. The ID tag reflecting grating is used for identifying the detected objects by the SAW on the reflecting substrate, and the substrate is provided with the interdigital transducer used for take charging to the electro-acoustic conversion of signals. According to the SAW-based passive temperature tag, a transmitting and receiving antenna is used for transmitting and receiving radio-frequency signals, the ID-tag reflecting grating is used for identifying the detected objects by the SAW on the reflecting substrate, and the temperature reflecting grating is used for measuring temperature by the SAW on the reflecting substrate. A reader is used for reading the ID information and the temperature data which are stored in the passive temperature tag, and the data is processed in an intermediate-frequency signal processing plate. With regard to the determination of the position of the echo baseband pulse signals, the centroid position replaces the peak position, therefore, the amount of computation is reduced, and the precision is improved.

Description

technical field [0001] The invention relates to a detection device in a cold chain logistics management system, in particular to a SAW-based passive temperature electronic tag and a reader thereof. Background technique [0002] In recent years, with the improvement of people's material living standards, people's consumption demand for cold chain food has also increased year by year, and related cold chain logistics operations have attracted more and more attention. Cold chain logistics generally follow the 3T principle, that is, the final quality of products depends on the storage and circulation time (Time), temperature (Temperature) and product storage resistance (Tolerance) in the cold chain chain. Therefore, temperature is a very important factor related to food safety. Important parameters, the internal temperature of the food and the continuity of the temperature during the transportation process must be strictly checked when the raw material is purchased and accepted....

AI Technical Summary

Problems solved by technology

Atlanta HotHead Sports and Identec have strengthened their cooperation with general GE Sensing and Cavist to launch an RFID football helmet that can transmit body temperature information to trainers or other staff; however, the temperature measured by these methods is not accurate and cannot Measure the temperature in real time

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