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1、太原理工大学硕士学位论文数字式明渠污水流量计数据采集处理系统研究姓名：姜乐申请学位级别：硕士专业：检测技术与自动化装置指导教师：马福昌20090401 太原理工大学工程硕士研究生学位论文 III数据库，保证就地显示、上位机实时调用、分析流量数据等功能的实现。 最后，选取了较常用的一种流量槽巴歇尔槽进行实验。并将系统与目前污水计量领域中唯一能够应用的超声波明渠流量计进行了对照实验。结果证明：本系统的直接数字取样特点，从根本上避免了模拟信号或“准数字化”取样中存在的各类问题，如：在非数字取样电路中，变换电路漂移对信号真实性的影响很大，系统受外界的干扰较严重等问题。本系统设计有效提高了传感器的容错能
2、力和流量计量的准确性、稳定性、可靠性，为实现远距离、无人值守、智能化、通用化明渠流量检测设备的应用提供了技术储备。 关键字：明渠，流量计，MSP430F149，数字式，智能化 太原理工大学工程硕士研究生学位论文 IV RESEARCH ON THE DATA ACUQUISITION AND PROCESSING SYSTEM OF DIGITAL FLOW-METER FOR OPEN CHANNAL SEWAGE ABSTRACT This project take one of the “863” plan topic projects “the digit position senso
3、r and the digital system equipment” as the research foundation, and subordinates to the doctoral thesis “the matrix digital detection theory and the trough body intelligence flowmeters research”. This paper is mainly about the data acquisition and processing system of trough body intelligence flowme
4、ter,Aiming to achieve the goal of digital, intelligence, general for flowmeter data acquisition and processing system, and provide technical support for the development of open channel sewage flowmeter. The major content and job finished of this article is following: (1)The intelligent, general-purp
5、ose data acquisition and processing system analysis The main detection method of open channel flow is weir and trough. The principle of this method is to detect the liquid level of liquid in weir trough firstly, and then to chang liquid level to flow value through a single-valued function. As there
6、are many kinds of weirs and troughs, we need to develop one kind of intelligent, general open channel flowmeter to be able to cope with more kinds of weirs and troughs. This is inevitable trend in this area,which is also the main purpose of this paper. (2) Proposing and Applying a dot matrix Detecti
7、ve theory We proposed a new method, that is making the continuous physical volume separated, in other words, separating the continuous level signal by many points. The separation points are reflected as 0 and 1 digital signal, then will be samped, and weighted point-by-point statistics. This can rea
8、lly achieve digital of 太原理工大学工程硕士研究生学位论文 Vsewage flow measurement device. (3) Low-power MSP430 microprocessor design and experiment The core processor of data acquisition and processing system was MSP430 singlechip, which is used to complete acquisition and processing of the digital signal, displayi
9、ng and control of external storage components. (4) Design about the external components of the system After a lot of research and testing at the area of sewage detective, we added LCD, clock, storage componentsin and set up the real-time history database in accordance with the requirements of the pe
10、ripherals in the system. These can ensure the data showed, epistatic machine called in time, flow data analysis achieved. Finally, we choosed one kind of commonly used flow trough-pashall trough to make experiment, and compared with Ultrasonic open channel flowmeter, which is currently only epuipmen
11、t at sewage area in china. Experimental proof that: the direct digital sampling method in the system solved the problems that existed in the analog signal or quasi-digital sampling. For example, in a non-digital sampling circuit, the drift of the signal transform circuit had great influence on the a
12、uthenticity of the system signal, and outside interference had great influence to the system and more serious problem. This system design effectively improved the fault tolerance of sensor and flow easurement accuracy, stability, reliability. provide the technical reserves for realize long-range, unmanned, intelligence, general open channel flow monitoring equipment. KEY WORDS: open channel, flowmeter, msp430f149, digital, intellgent 太原理工大学工程硕士研究生学位论文 VIII图表索引 图1-1 模拟量检测简化框图.2 图1-2 数字式检测简化框图.3 图2-1 文丘里水槽示意图.7 表2-1 堰槽流量计量公式.10 图2-2 系统结构图.12 图2-3 感应触点排列图.
