LabVIEW环境下的声波测距系统设计

Design of an Sonic Wave Distance Measurement System in LabVIEW Environment

虚拟仪器因具有突出的便捷性,高效性以及精确性,正被广泛地应用到科学测量的各个领域,普通高校实验室也应引进这一技术以适应未来仪器技术的发展。介绍了一种可在普通PC机上开发并用于短距离精确测量的非接触声波测距系统,引进LabVIEW虚拟仪器开发软件并设计出用于该系统的虚拟信号发生器和虚拟数字示波器。系统在短距离测距时具有较高的稳定性和精确度,操作简单且成本低廉,对学生初步认知虚拟仪器技术能够发挥重要作用。

The virtual intruements are used in every fields of scien ce more and more , because of its characteris-tics of convenience,high efficiency and accuracy .The laboratories of ordinary universities should introduce this technology to adapt the development of the future instrument.A non-contact sonic wave distance measurement system is introduced,which can be developed on PC and used for short-distance precision measurement.The o-verall design scheme and the realization of each system are expatiated.In the soltware design ,LabVIEW virtual instrument development soltware is used for designing virtual signal generator and virtual digital oscilloscope to reduce the development costs, if the speed of sound is known ,the distance can be calculated by counting the phase dillerence of two columns of waves which input virtual digital oscilloscope.In the actual test, it’s lound that the system has the characteristics of high stability and accuracy , low cost, and it will play an important role for the students to learn the virtual instrument preliminarily.