Passive Wireless Wearable Body Temperature Monitoring System Based On NFC

Body temperature monitoring,especially long-term body temperature monitoring,is attracting more and more attention.In the fields of personal health care,patient body condition assessment,and major epidemic prevention and control,body temperature monitoring has become an important means.However,there is still a lot of room for improvements in current temperature monitoring methods.For example,traditional mercury thermometers have low measurement efficiency;infrared thermometers are difficult to measure for a long time and can only obtain bare skin temperature,which is susceptible to ambient temperature;bluetooth body temperature patches are needed to be improved in comfort and power supply method.Research on personal health care equipments never stops at home and abroad.Flexibility,daily measurement and cost are the focus of attention.This research focuses on these concerns to design a passive wireless,overall flexible,bendable and stretchable patch.The body temperature measurement patch can be conformally incontact with the skin,miniaturized,and comfortable to wear for a long time.At the same time,by using Near-Field Communication technology,the patch can be connected to the reading device to collect,analyze and process the body temperature data.The main research contents are as follows:In this research,the overall design of the system is in the first place: the patch part of the body temperature measurement system is designed into a hollow sandwich structure,including an upper waterproof layer,an intermediate circuit layer,and a lower adhesive layer,to ensure the comfort and conformal contact during use;The circuit part is flexibly designed without using a printed circuit board to ensure the overall flexibility of the patch;the data reading function is designed to make the function of the system more abundant,including ID acquisition,data reading,storage and alarm functions.After the design is completed,the system is simulated,and the simulation scenario is used to carry out simulation analysis from the thermal and mechanical perspectives to verify the rationality and usability of the patch design.Then,the thermal conductivity improvement scheme is simulated,and the simulation results verify the feasibility of the scheme,actual experiments can be carried out.In actual experiments,graphene nanosheets and diamond nanoparticles were mixed with flexible materials separately to form a composite material with improved thermal conductivity.Using this composite material with improved thermal conductivity to encapsulate circuits and perform characterization and performance tests,it was found that the distribution of the composite material after adding graphene was uniform,the thermal conductivity is uniform,the body temperature monitoring patch thermal performance and repeatability are excellent.Finally,the data reading system was developed,and the body temperature monitoring system was used for actual measurement work,covering the following four parts: biological clock,post-exercise burning effect,diet and unconventional work and rest.The test data is plotted in the order of clock,and the relationship between body temperature and circadian clock,diet,exercise,and work and rest is analyzed,which verifies the availability of the subject's passive wireless wearable body temperature monitoring system based on NFC and the significance of long-term body temperature monitoring.The main meaning of this study is: using graphene nanosheets to improve the thermal conductivity of PDMS materials,the thermal conductivity of composite materials is increased by 27.1%,which helps to improve the thermal performance of the system and the measure can be finished in a shorter time;the overall temperature measurement patch is in a flexible state and can conform to the skin,at the same time,the hollow sandwich structure is used to reduce the area of contact with the skin and can ensure long-term wearing comfort;a NFC-enabled mobile phone is used as a reading device to achieve more functions and meet most body temperature measurement scenarios.