Research On Marine Salinity Sensing Technology With Diamond Thin-film Electrode

The ocean salinity sensor is an important tool for studying basic ocean fluid mechanics characteristics such as seawater temperature and salinity.In the surveillance of the marine environment,marine scientifical research,marine mitigation and disaster preventive,marine and national defense construction,ocean salinity senior plays an irreplaceable position.The high-performance salinity sensor has the prominent features of high accuracy and stability,which can be used in the intricate marine environment.In order to meet the urgent needs of contemporary marine research,a marine salinity sensor based on boron-doped diamond film electrode is proposed through theoretical analysis and research on the key technologies such as materials and devices involved in the temperature and salt measurement system,which can effectively improve the measurement accuracy and long-term stability of the marine temperature and salt sensor.In order to deepen the research of high-performance ocean temperature and salt sensors based on diamond thin film materials,the problems existing in the data of conventional electrode conductivity sensors are analyzed and studied.This material assesses the existing situation and gaps of development research at home and outside the country.It is discovered that the electrode content is easy to fall off,the structure is unsteady,the anti-biological attachment ability is poor,and the strength consumption of the sensor evaluation system is high.Therefore,in this dissertation,the overall structure of the sensor is first designed from the application of the measurement principles of both the temperature and polarity conductivity,and is then followed by the design of the temperature transducer according to the processing requisition of the temperature and salt sensor,and a probe-preservation course of the diamond film electrode electric conductivity sensor is elaborated with the combination of the polarized diamond film membrane profile,and the procedure of the fabrication of the polarization cell structure is over-viewed.Next,the circuit and program design has been completed in terms of hardware and software.The core processor is STM32 L series chip from STMicroelectronics(ST),which is an STM32 chip with ultra-low-power 32-bit ARM MCU+FPU.In addition,the selection of devices,the low power mode setting of the chip and the power supply system are optimized to achieve low power consumption.After calibration,date analysis and treatment of the temperature and salt sensor,and functional verification and reliability testing in the shoreside experiment and seakeeping test,the conductivity sensor prototype based on boron-doped diamond thin film and electrodes was delivered in this manuscript.The running test results and experimental data of the prototype of boron-doped diamond film electrode temperature and salt sensor designed in this thesis show that the sensor has excellent characteristics such as low power consumption,high precision,stability and reliability,and has achieved the expected goal.