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机构地区:[1]深圳大学机电与控制工程学院自动化科学系,广东深圳518060
出 处:《仪表技术与传感器》2007年第6期16-18,共3页Instrument Technique and Sensor
基 金:国家自然科学基金(60204013);广东省自然科学基金(5010497;000845);深圳市科技局基金
摘 要:在常规的噪声测量中普遍采用声级计,传统的声级计一般是利用硬件计权网络实现对噪声信号的计权,利用硬件的滤波网络实现噪声的倍频程分析以及给出平均声级等。设计了一种基于LabView的虚拟式声级计,介绍了该虚拟声级计的硬件结构、软件设计流程、频率计权和统计分析模块。采用TES-1356音压校准器对所设计的系统进行了校准,通过和TES-1357精密声级计的比较实验,验证了所设计声级计的正确性,性能达到了Ⅰ型声级计指标。所开发的多功能虚拟声级计程序模块化、灵活,很容易和其它设备集成,可应用于工业过程需要噪声或声级测量的众多场合。Conventional sound level meters generally use precision ceramic microphones and discrete solid state circuitry or integrated circuit operational amplifiers, and a set of standardized frequency weighting filters, standardized exponential time weighting circuits, logarithmic amplitude detector, and a display in decibels capable of measuring the RMS averaged sound level and other specifications, Described the design of a virtual sound level meter in labvlew. The developed meter or instrument consists of a microphone, preamplifier, an A/D card,and a computer with software LabView, The software design flow was presented. The weighting network module,statistic analysis were discussed in details, The meter was calibrated by using TES- 1356 sound level calibrator and the correctness was verified by comparative experiment with TES- 1357 exact sound level meter. The complete virtual instrument is capable of meeting the type 1, requirements of GB/T3785. The instrument has a modularity structure and could be easily used in conjunction with the device in any industrial application for noise or sound level measurements.
分 类 号:TH7[机械工程—仪器科学与技术] TB5[机械工程—精密仪器及机械]
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