用于海洋化学参数探测的多通道数据采集器的研发
发布时间：2018-10-25 10:21
【摘要】：本文描述了一种能够实时原位监测的水下多通道数据采集器的研发。该数据采集器能够同时处理离子选择性电极和电流型传感器的信号,具有高输入阻抗、在线通讯、低功耗、小型化和高可靠性的特点。它可以连接各种各样的化学传感器,包括pH电极、钙离子电极、硫化氢传感器等。该数据采集器由处理传感器信号的前置放大电路、控制电路的微控制器、用于数据存储的Flash存储器、RS-485通讯接口和电源模块组成。本文对这些子模块分别设计,然后集成为一整套系统。 本文采用德州仪器公司的MSP430F149作为数据采集器的微控制器。MSP430F149有丰富的片内外设,还具有超低功耗、低供电电压的特点,这些特性使得其适用于系统小型化和低功耗设计。根据计算,该数据采集器可在2Hz采样频率下连续运行283天。离子选择性电极信号采集通道采用了具有高输入阻抗的运算放大器进行电压跟随,使得数据采集器能够准确地测量离子选择性电极产生的信号；电流型传感器信号采集通道采用三电极放大系统；温度信号采集通道采用三线制测温电路,能够消除接线电阻对测量结果的影响,提高测量的准确性。电源管理模块由一个低压差线性稳压器和两节锂电池组成,存储部分采用内存为1GB的Flash存储器,通讯部分采用RS-485协议。本文然后对系统的软件部分进行了数据格式定义、通讯协议的制定和状态机设置等。 本文对数据采集器的采样、数据存储和通讯功能进行验证实验,重点是对离子选择性电极信号采集通道、电流型传感器信号采集通道和温度传感器信号采集通道进行测试。实验结果都达到了预期目标,系统各个功能模块性能良好。本文还做了与pH电极和溶解氧电极连接起来的综合实验。实验结果证明该数据采集器能够很好的获得传感器的信号。
[Abstract]:This paper describes the development of a multi-channel underwater data acquisition system which can be used for real-time in-situ monitoring. The data collector can process the signal of ion selective electrode and current sensor at the same time. It has the characteristics of high input impedance, online communication, low power consumption, miniaturization and high reliability. It can connect a variety of chemical sensors, including pH electrode, calcium electrode, hydrogen sulfide sensor and so on. The data collector consists of a preamplifier circuit for processing the sensor signal, a microcontroller for the control circuit, a Flash memory for data storage, a RS-485 communication interface and a power supply module. These sub-modules are designed and integrated into a whole system. In this paper, the MSP430F149 of Texas Instruments is used as the microcontroller of the data collector. The MSP430F149 has abundant peripheral devices, ultra-low power consumption and low power supply voltage. These characteristics make it suitable for the miniaturization and low-power design of the system. According to the calculation, the data collector can run continuously for 283 days at 2Hz sampling frequency. The Ion-selective electrode signal acquisition channel uses an operational amplifier with high input impedance to follow the voltage, so that the data collector can accurately measure the signal generated by the ion-selective electrode. The current sensor signal acquisition channel adopts a three-electrode amplification system and the temperature signal acquisition channel adopts a three-wire temperature measuring circuit which can eliminate the influence of the wiring resistance on the measurement results and improve the accuracy of the measurement. The power management module is composed of a low-voltage differential linear voltage regulator and two lithium batteries. The memory part is Flash memory with 1GB memory, and the communication part is RS-485 protocol. Then, the data format, communication protocol and state machine are defined in the software part of the system. In this paper, the data acquisition, data storage and communication functions of the data collector are verified. The emphasis is on the measurement of the ion selective electrode signal acquisition channel, the current sensor signal acquisition channel and the temperature sensor signal acquisition channel. The experimental results reach the expected goal, and the performance of each functional module of the system is good. A comprehensive experiment with pH electrode and dissolved oxygen electrode is also carried out in this paper. The experimental results show that the data collector can get the signal of the sensor well.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P716.5
本文编号：2293425
[Abstract]:This paper describes the development of a multi-channel underwater data acquisition system which can be used for real-time in-situ monitoring. The data collector can process the signal of ion selective electrode and current sensor at the same time. It has the characteristics of high input impedance, online communication, low power consumption, miniaturization and high reliability. It can connect a variety of chemical sensors, including pH electrode, calcium electrode, hydrogen sulfide sensor and so on. The data collector consists of a preamplifier circuit for processing the sensor signal, a microcontroller for the control circuit, a Flash memory for data storage, a RS-485 communication interface and a power supply module. These sub-modules are designed and integrated into a whole system. In this paper, the MSP430F149 of Texas Instruments is used as the microcontroller of the data collector. The MSP430F149 has abundant peripheral devices, ultra-low power consumption and low power supply voltage. These characteristics make it suitable for the miniaturization and low-power design of the system. According to the calculation, the data collector can run continuously for 283 days at 2Hz sampling frequency. The Ion-selective electrode signal acquisition channel uses an operational amplifier with high input impedance to follow the voltage, so that the data collector can accurately measure the signal generated by the ion-selective electrode. The current sensor signal acquisition channel adopts a three-electrode amplification system and the temperature signal acquisition channel adopts a three-wire temperature measuring circuit which can eliminate the influence of the wiring resistance on the measurement results and improve the accuracy of the measurement. The power management module is composed of a low-voltage differential linear voltage regulator and two lithium batteries. The memory part is Flash memory with 1GB memory, and the communication part is RS-485 protocol. Then, the data format, communication protocol and state machine are defined in the software part of the system. In this paper, the data acquisition, data storage and communication functions of the data collector are verified. The emphasis is on the measurement of the ion selective electrode signal acquisition channel, the current sensor signal acquisition channel and the temperature sensor signal acquisition channel. The experimental results reach the expected goal, and the performance of each functional module of the system is good. A comprehensive experiment with pH electrode and dissolved oxygen electrode is also carried out in this paper. The experimental results show that the data collector can get the signal of the sensor well.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P716.5
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