Research On Temperature Compensation Techniques For Quartz Resonator Force Sensor And Infrared Device For Human Temperature Screening

The temperature compensation technique is a crucial technique for the R&D and applications of sensor. This thesis was devoted to the researches of the temperature characters of two types of sensors, the quartz resonator force sensor and the thermopile, and special compensation methods were studied.Among the present compensation solutions of quartz resonator force sensors, the compensation parameters are likely designed for individual compensation of the sensor. An individual calibration is needed and the productivity is low. To overcome it, a novel way was raised in this thesis based on careful studying of the main producing procedure of the sensors as well as the factors that affected the rule of temperature character. The main producing procedure of the sensors was carefully studied and the factors that affected the rule of temperature character were discovered. Then sensors that had the same temperature character were achieved by controlling the producing procedure and the individual calibration was avoided. The detail process of analysis and the experiments were introduced and the performance of the compensation was calculated.Based on a varactor and a new type of IC chip, a numerical temperature compensation method for the quartz resonator force sensor was introduced in the thesis. By using the DS1847, a new chip in which two variable resistors, a temperature sensor and EEPROM were integrated together, a compensation system was developed. A controllable voltage was generated from the system and was executed on a varactor to realize the compensation purpose. Only an initialization was needed and then it could function without the help of MCU. The system had a high precision and a low cost.In addition, to develop a portable infrared device for human temperature screening, a set of temperature compensation method on thermopiles was designed. The unique character of the thermopiles' output signal was utilized to simplify the calibrations from two-dimension to one-dimension. An applied arithmetic was established and a qualified precision was achieved according to the State Standard GB/T 19146—2003. A convenient improvement was raised in the end.