Research On Quartz Tuning Fork Temperature Sensor Test System Based On SOPC

With the rapid development of science and technology, the demand for the market is getting higher and higher to the high-performance low-power sensing system and also to the high-precision temperature measurement. So the precise temperature measurement has already become an important component in the modern observation and control technology system.Traditional temperature sensors (thermal resistance, thermocouple, semiconductor integrated temperature sensors) are all analog sensors. Their output signals must pass through A/D converters, and their shortcomings are low conversion efficiency, big power loss, complex conversion, bad anti-electromagnetic interference ability and inconvenient for digital signal processing. While the quartz crystal temperature sensor is a digital sensor whose output signal is frequency. The quartz crystal temperature sensor has the characteristics of high sensitivity, good long-term stability, wide dynamic range and easy to compatible with digital systems and so on. And the frequency output signal can connect with computer, not having to pass through A/D converter, and can compose high-precision measurement and control system. So the quartz crystal temperature sensor has already become an important study object in the micro-sensor field.Traditional temperature sensors measurement and control systems are designed using the single-chip microcomputer as the core. The systems have many shortcomings that the frequency measurement speed is slow, the systems are susceptible to external conditions, the reliability is bad and the power loss is high. In this regard, this paper introduced SOPC technology. Then combined it with quartz tuning fork temperature sensor, and designed a new type of high-performance digital and intelligent sensor system as a purpose. In the design, the functional modules which the system requires are all integrated into an FPGA chip, and then a programmable system-on-chip has been built. This design improves the process speed, and has flexible design way that the system can be reduced, extended and upgradeable. The system is also has online programmable function of the software and hardware.First, the paper analyzes the development actuality and trends at home and abroad of the quartz tuning fork temperature sensor and SOPC technology. It also analyzes the quartz tuning fork temperature sensor's work principle in detail, simultaneously introduces SOPC and the related technologies. Second, the paper introduces the test system's software and hardware design in detail. The hardware design includes the frequency measurement module's design and the entire hardware system's build. It uses Verilog HDL language to realize the frequency measurement module design, and uses SOPC Builder and Quartus II development kit to integrate NIOS II processor and the frequency measurement module into the FPGA chip. Thus, the hardware system's construction is completed. The software design includes the user application procedure compilation and the debugging. Uses C language to program and uses NIOS II IDE development kit to debug and run the entire test system. Finally, the designed system is tested. Through the obtained experiment data, the paper analyzes the static and dynamic characteristics of the quartz tuning fork temperature sensor. Uses the least squares method to fit the third polynomial and uses the Matlab to simulate the characteristic curve of the quartz tuning fork temperature sensor.