Graphene/Bpoxy Flexible Temperature Sensing Film And Measurement For Temperature Field

In the field of civil engineering,the temperature stress caused by temperature field changes often affects the structural stability,and the serious damage is caused by damage.In the field of energy application,it is of great significance to study the change of temperature field of medium heat exchange surface and to explore the law of heat transfer.Therefore,the realization of effective temperature field detection is of great significance to solve many engineering problems.The traditional temperature sensor cannot meet the requirement of dynamic response and spatial distribution measurement,and the radiation method is not enough to measure temperature in low precision and can only measure the temperature field of the target plane,and it is difficult to meet the demand in many situations.In this paper,a flexible resistive temperature sensing film is proposed based on the composite conductive materials of resin matrix composites filled with several carbon materials.Using screen printing technology to graphene,carbon nanotubes and carbon black filled epoxy resin compound conductive material for heat dielectric,polymer conductive silver pulp for flexible circuits electrodes,polyimide and polyurethane membrane for flexible substrate,light solid insulating interlayer,UV ink do constitute array distributed temperature sensing film.This paper is based on the previous research of the research group.In this paper,the influence factors,static characteristics and dynamic response characteristics of graphene and carbon nanotubes filled with epoxy resin composite conductive materials are studied.A linear temperature sensing film was developed by using its temperaturesensitive properties.The test results of one-dimensional unsteady heat conduction show that linear temperature sensing film based on graphene,carbon nanotubes filling compound conductive material can realize good awareness of temperature gradient,and it provides a possibility for the distributed temperature sensing film test temperature field.In this paper,the flexible temperature sensing film of array is designed and the crosstalk of array units is analyzed.A distributed array signal acquisition system based on STM32 microcontroller is developed.The hardware system is divided into two parts: signal detection,conditioning circuit and circuit control.The system can effectively avoid cross-crosstalk problem between sensors.C language is used to write temperature sensing film signal processing and display software to realize real-time processing,interpolation and image display,etc.In order to explore the feasibility and reliability of temperature sensing film and array signal scanning test system.The temperature distribution of the surface temperature and the surface temperature of the cylindrical axis are tested.The test results verify the feasibility of the temperature field test system developed in this paper,and show a good sensitivity to the resolution of temperature anomalies and the change of temperature field.This system can realize dynamic and real-time measurement of temperature field.