The Research And Application Of Fluorescence Measuring System Of Uranium

This paper designed and developed a set of detection system of uranium concentration through the research of fluorescence measurement of uranium.The system not only can be used for rapid analysis of trace uranium’s content in the liquid samples such as surface water and underground water,but also can be used for rapid analysis of solid samples handled in accordance with the specified sample preparation method.The system can get the uranium concentration in the samples directly under the condition of correct use according to operation steps and specification.The system has the characteristics of small volume,low power dissipation,high measurement precision,fast detection speed and easy operation.Fluorescence induction method is one of the classic methods of uranium concentration’s measurement. Thispaper put forward a set of design thought and implementation scheme by putting the method as theoretical basis.The design completed the development of the system of uranium’s fluorescent measurement by putting embedded processors of Nios II based on FPGA as control core and putting STM32 singlechip as auxiliary function peripherals.This paper analyses the development of system from the following five aspects:(1) System architecture design.Architecture design is based on a detailed analysis of fluorescence measurement theory of uranium.By means of structure design of the detector of uranium’s fluorescence measurement system,the dectector finished the wavelength filter of trigger fluorescence and excitation fluorescence, and improved the system response speed and system stability.(2)Nios II embedded processor based on FPGA.The design includes three aspects: the select of FPGA,the construction of the processor hardware platform,the design of functional logic.The system built a series of function modules,including fluorescent light sequential control by using Verilog HDL hardware description language and loaded the custom IP core which is encapsulated by modules into the system and finished data communication with the Nios II processor.The system not only realized complex sequence cooperation of fluorescence excitation and signal integral,but also distinguished interfering organic fluorescence and uranyl ion fluorescence successfully and improved the measurement precision.In the process of measurement,the design improved the system response speed and enhanced the system stability through the use of the time domain waveform compression algorithm and the moving average filtering algorithm.(3)STM32 singlechip.The system finished the driver control to peripherals,such as Keyboard and printer Through the hardware circuit design and software coding of STM32 singlechip.(4)PC control platform.The remote control platform of fluorescent measurement system of uranium is designed by MFC.The platform can finish all steps only through an USB cable.(5) System test and experiment.The test completed the measurement of high and low concentration by using this fluorescence measuring system of uranium.It shows that the technical indicators of fluorescence measurement system of uranium has reached Industry standard’s requirements.