Design And Experimental Study Of Thermopile - Type Heat Flux Sensor

With the rapid development of modern science and technology, many industrial manufacturing processes require tight temperature control of material throughout processing to establish the desired properties and quality. Maximizing or minimizing the thermal energy transfer in many systems is crucial to their optimum performance. Heat flux is a critical parameter in many engineering systems. Moreover, heat flux is a derived quantity that is not easily sensed. According to the requirements of scientific research and industry production, a kind of heat flux sensor, with small volume, light weight, high precision, is presented to meet these requirements.Firstly, the present situation of heat flux measurement technology at home and abroad is detailed investigation. Combined with the indicator of the overall design and according to the comparative research of the principle and characteristics of heat flux measurement technology, the design plan and the desired objectives of heat flux sensor is determined. Secondly, it is derived that heat flux sensor linear relationship between heat flux input and voltage output followed by a detailed analysis of the working principle of heat flux sensor. According to the actual structure of heat flux sensor, it is to study the factors that influence the performance of the sensor. Combined with the research of radiation theory, it is proposed that a kind of sensor surface treatment solution. According to the thermodynamic simulation and analysis of the factors influencing the performance of the sensor by ANSYS finite element analysis software, the specific requirements of materials and structures is proposed. Based on the characteristics of the radiative heat flux measurement, this paper designs a basic structure of the sensor. Since then, it is introduced that the selection of principle of the thermal resistance, thermoelectric materials and production methods. The assembly solution of sensor is determined by comparative analysis of various methods. This paper designs a filter amplifier circuit for the sensor and Lab VIEW display panels. It realizes display function of the amplified voltage of sensor based on MSP430 and LCD. Finally, according to the heat flux measurement standards, the sensor calibration platform is built to calibrate the design heat flux sensor by Black-body furnace as standard radiation sources. At last, the calibration experiments showed that the measuring range of the designed thermopile-type heat flux sensor is 0～20kW/m2, relative error is 3.3%,meeting the design requirements.