Application of optical interferometry in focused acoustic field measurement. (21st July 2018)

• Record Type: Journal Article
• Authors: Wang, Yuebing; Sun, Min; Cao, Yonggang; Zhu, Jiang
• Is Part Of: Journal of sound and vibration. Volume 426(2018)
• Page Start: 234
• Page End: 243
• Publication Date: 2018-07-21
• Subjects: Optical interferometry -- Focused field -- "Effective" refractive index; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2018.04.023
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: Optical interferometry has been successfully applied in measuring acoustic pressures in plane-wave fields and spherical-wave fields. In this paper, the "effective" refractive index for focused acoustic fields was developed, through numerical simulation and experiments, the feasibility of the optical method in measuring acoustic fields of focused transducers was proved. Compared with the results from a membrane hydrophone, it was concluded that the optical method has good spatial resolution and is suitable for detecting focused fields with fluctuant distributions. The influences of a few factors (the generated lamb wave, laser beam directivity, etc.) were analyzed, and corresponding suggestions were proposed for effective application of this technology.