Direct measurement of sound field

PAN Sun-qiang; CHEN Zhe-min; ZHANG Jian-feng

doi:10.3788/OPE.20152311.3077

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Direct measurement of sound field

更新时间：2020-08-13

- Direct measurement of sound field
- Optics and Precision Engineering Vol. 23, Issue 11, Pages: 3077-3082(2015)
- 作者机构：
  
  浙江省计量科学研究院,浙江杭州,310018
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152311.3077
  CLC： O422.2;TN247
- Received：11 August 2015，
  
  Revised：06 September 2015，
  
  Published：25 November 2015
- 稿件说明：
移动端阅览
潘孙强, 陈哲敏, 张建锋. 声场的直接测量[J]. 光学精密工程, 2015,23(11): 3077-3082

PAN Sun-qiang, CHEN Zhe-min, ZHANG Jian-feng. Direct measurement of sound field[J]. Editorial Office of Optics and Precision Engineering, 2015,23(11): 3077-3082
潘孙强, 陈哲敏, 张建锋. 声场的直接测量[J]. 光学精密工程, 2015,23(11): 3077-3082 DOI： 10.3788/OPE.20152311.3077.

PAN Sun-qiang, CHEN Zhe-min, ZHANG Jian-feng. Direct measurement of sound field[J]. Editorial Office of Optics and Precision Engineering, 2015,23(11): 3077-3082 DOI： 10.3788/OPE.20152311.3077.

摘要

为准确测量声场分布

研究了基于激光测振仪的声场直接测量技术。基于声音在空气中传播时会引起空气折射率周期性变化的原理

利用激光测振仪测量了激光通过声场时激光光程受空气折射率的调制发生周期性变化产生的振动速度。由于声场在激光方向上的投影即为激光测振仪测得的振动速度

测量了声场在不同投影方向上的振动速度

再由Radon逆变换重构声场复振幅分布

从而实现了对声场的直接测量。文中实验测量了2 kHz声场引起的振动速度振幅分布和相位分布

进而重构得到声压振幅分布和瞬时声压分布。测量得到空间分辨率为2 cm

声压振幅最大为0.026 Pa

对应的声压级为62.3 dB。实验结果表明

基于激光测振仪的声场分布直接测量方法是可行的

该方法解决了现有麦克风阵列接触式测量声场存在的问题。

Abstract

To measure the sound field distribution accurately

a direct sound field measurement method based on a laser vibrometer is researched. Based on the fact that the air refractive index is changed periodically when the sound wave propagates in the air

the vibration velocity caused by the periodically changed refractive index occurred in laser passed through a sound field can be measured by the laser vibrometer. As the projection of the sound field in the direction of the laser is the vibration velocity

the direct measurement of sound field can be completed by measuring the projection of the sound field in different directions and reconstructing the complex amplitude distribution of the sound field using inverse Radon transform. The amplitude distribution and phase distribution of the vibration velocity caused by a 2 kHz sound field are measured experimentally

and the sound pressure amplitude distribution and the instantaneous sound pressure distribution are reconstructed. The measurement shows that the spatial resolution is 2 cm

the measured maximum sound pressure amplitude is 0.026 Pa

and corresponding sound pressure level is 62.3 dB. Experimental results indicate that the direct sound field measurement based on the laser vibrometer is feasible

and it solves the problem existing in the sound field measurement by using microphone arrays.

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references

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