基于LabVIEW的声级计校准系统的设计与实现

发布时间：2018-01-12 05:07

本文关键词：基于LabVIEW的声级计校准系统的设计与实现　出处：《华南理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：声级计是评估噪声水平的仪器,也是声学测量中最常见的仪器之一。声级计广泛应用在环境保护、劳动卫生、科研教学和工业企业等领域,可见声级计关系着人们的日常工作和生活,所以确保声级计的量值准确可靠有着重要的意义。但目前在声级计的检定过程中,有大量的重复操作仪器的工作,且容易出现错误且效率比较低,所以对技术操作人员要求较高,因此对研究开发声级计的计量系统具有积极的意义。在深入研究声级计的工作原理和国家计量检定规程的要求的基础上,本文研究基于LabVIEW的声级计校准系统。这套系统通过计算机使用LabVIEW软件控制33220函数/任意波形发生器进行声级计自动检定。它能够完成基本声级计全部项目,而且成本代价小,对非计算机专业编程的人来说,LabVIEW的图形、流程图、术语、概念等等相比代码会感到更熟悉和易懂,并使编写程序的过程更简单方便和生动有趣,具有成本低,简单,易用,方便等特点。硬件方面,这套声级计校准系统使用了常用的33220函数/任意波形发生器进行替代了传统的声级计计量的主标准器,并且通过USB接口连接到计算机,所有的声级计检定操作都在计算机上完成,可见该系统对声级计检定所需要的仪器进行了简化,操作简便并保证了信号的准确可靠。软件方面,这套声级计校准系统的操作介面分为7个功能模块,分别对应声级计各个主要计量项目。其中系统采用的主体框架是生产者/消费者的设计模式,类似编程中的事件结构,这种结构让整个系统变得简单并降低CPU利用率,系统的操作介面中有29个可点击的输入控件,这29个输入控件就是系统中的29个事件,在操作介面选择一个事件发生后,程序会自动执行一系列的动作,然后继续等待,节省CPU资源,保证了软件系统的高效和稳定。本文提出的这套声级计校准系统可以完成声级计所有的检定项目,并且可以保证准确性和时效性,特别是对仪器的操作进行了简化,减少检定过程中出现的人为误差,极大提高了检定效率,而且这套声级计校准系统的检定结果与原标准装置的一致,可以在声级计的日常检定中使用。
[Abstract]:Sound level meter is one of the most common instruments in acoustic measurement. It is widely used in environmental protection, labor health, scientific research and teaching, industrial enterprises and other fields. It can be seen that the sound level meter is related to people's daily work and life, so it is of great significance to ensure the accuracy and reliability of the sound level meter. However, in the verification process of the sound level meter, there are a large number of repeated operation instruments. And prone to errors and low efficiency, so the technical operator requirements are high. Therefore, it is of positive significance to research and develop the measurement system of sound level meter. On the basis of in-depth study of the working principle of the sound level meter and the requirements of national metrological verification regulation. A sound level meter calibration system based on LabVIEW is studied in this paper. The system uses LabVIEW software to control 33220 function / arbitrary waveform generator for automatic verification of sound level meter. Be able to complete all basic level meter projects. And the costs are small, and LabVIEW's graphics, flowcharts, terminology, concepts and so on will be more familiar and understandable to non-computer programmers than code. And make the process of programming more simple, convenient and lively and interesting, with low cost, simple, easy to use, easy to use, and so on. Hardware aspects. The sound level gauge calibration system uses the commonly used 33220 function / arbitrary waveform generator to replace the main standard device of the traditional sound level meter measurement, and is connected to the computer through the USB interface. All the verification operations of the sound level meter are completed on the computer. It can be seen that the system simplifies the instrument needed for the verification of the sound level meter, and it is easy to operate and ensures the accuracy and reliability of the signal. The operating interface of the sound level gauge calibration system is divided into seven functional modules corresponding to each major measurement item of the sound level meter respectively. The main frame of the system is the design pattern of the producer / consumer. Similar to the event structure in programming, which makes the system simple and reduces CPU utilization, there are 29 clickable input controls in the operating interface of the system. These 29 input controls are 29 events in the system. After the operation interface selects an event, the program automatically performs a series of actions, and then continues to wait, saving CPU resources. The calibration system of the sound level meter presented in this paper can complete all the verification items of the sound level meter, and can ensure the accuracy and timeliness. In particular, the operation of the instrument is simplified, the artificial error in the verification process is reduced, and the verification efficiency is greatly improved, and the calibration results of the sound level gauge calibration system are consistent with those of the original standard device. It can be used in the daily verification of sound level meter.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH73

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