基于光栅投影的扬声器纸盆振动测量研究

发布时间：2018-03-30 20:11

本文选题：光学三维测量　切入点：扬声器振动模态测量　出处：《浙江师范大学》2015年硕士论文

【摘要】：我国虽然扬声器产量较大,但是扬声器的质量普遍偏低,与一些发达国家的产品相比存在巨大差距,因此提高扬声器质量是一个亟需解决的问题。由于扬声器纸盆的振动和辐射特性对扬声器声音质量影响较大,所以测量扬声器纸盆振动模态、分析扬声器非线性失真的原因对扬声器的设计生产有较大的实际意义。随着静态光学三维测量技术的发展成熟,以及电子技术、光电子技术、光学等技术的发展,动态光学三维测量逐渐成为研究热点。基于动态光学三维测量方法全场测量、高分辨率、高速和高精度等特点,本文提出了基于光栅投影的扬声器振动测量系统。论文包含以下几个部分：1)介绍了目前扬声器纸盆振动测量的典型方法,分析了其优缺点；2)讨论了光栅投影三维测量技术基本原理；3)研究了采用低速相机的扬声器振动测量,包括测量系统结构、工作流程、相机外触发时序分析、外触发电路设计；4)对系统进行实验验证,分别利用低速相机及高速相机搭建测量系统对扬声器振动测量,并对两个系统的测量结果进行对比分析,证明论文所提方法是完全可行的。最后分析了实验结果的误差；5)总结和展望。本文创新点包括：使用光栅投影技术,不但可以实现全场的扬声器纸盆振动模态测量,而且可以实时全场测量纸盆振动的幅度、相位；利用低速相机完成动态测量,节约了成本；设计了相机外触发控制电路,实现图像的实时自动采集。
[Abstract]:Although the output of loudspeakers in China is large, the quality of loudspeakers is generally low, and there is a huge gap compared with the products of some developed countries. Therefore, improving the quality of loudspeakers is an urgent problem to be solved.Since the vibration and radiation characteristics of loudspeaker paper basin have a great influence on the sound quality of loudspeaker, it is of great practical significance to measure the vibration mode of loudspeaker paper basin and analyze the reasons of loudspeaker nonlinear distortion for the design and production of loudspeaker.With the development of static optical 3D measurement technology, as well as the development of electronic technology, optoelectronic technology and optical technology, dynamic optical 3D measurement has gradually become a research hotspot.Based on the characteristics of full-field measurement, high resolution, high speed and high precision, a loudspeaker vibration measurement system based on grating projection is proposed in this paper.This paper includes the following parts: (1) this paper introduces the typical methods of measuring the vibration of loudspeaker paper basin, and analyzes its advantages and disadvantages. (2) the basic principle of 3D measurement technology of grating projection is discussed. (3) the vibration measurement of loudspeaker using low speed camera is studied.Including the structure of measurement system, workflow, timing analysis of external trigger of camera, external trigger circuit design 4) to verify the system, using low-speed camera and high-speed camera to set up measurement system to measure loudspeaker vibration.The measurement results of the two systems are compared and analyzed, which proves that the method proposed in this paper is completely feasible.Finally, the error of the experimental results is analyzed.The innovations of this paper include: using grating projection technology, not only can realize the full-field vibration mode measurement of loudspeaker paper basin, but also can measure the amplitude and phase of paper basin vibration in real time, and use low-speed camera to complete the dynamic measurement.The external trigger control circuit is designed to realize the real-time automatic image acquisition.
【学位授予单位】：浙江师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN643

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