Share Email Print

Proceedings Paper

Estimation of vibration frequency of loudspeaker diaphragm by parallel phase-shifting digital holography
Author(s): T. Kakue; Y. Endo; T. Shimobaba; T. Ito
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

We report frequency estimation of loudspeaker diaphragm vibrating at high speed by parallel phase-shifting digital holography which is a technique of single-shot phase-shifting interferometry. This technique records multiple phaseshifted holograms required for phase-shifting interferometry by using space-division multiplexing. We constructed a parallel phase-shifting digital holography system consisting of a high-speed polarization-imaging camera. This camera has a micro-polarizer array which selects four linear polarization axes for 2 × 2 pixels. We set a loudspeaker as an object, and recorded vibration of diaphragm of the loudspeaker by the constructed system. By the constructed system, we demonstrated observation of vibration displacement of loudspeaker diaphragm. In this paper, we aim to estimate vibration frequency of the loudspeaker diaphragm by applying the experimental results to frequency analysis. Holograms consisting of 128 × 128 pixels were recorded at a frame rate of 262,500 frames per second by the camera. A sinusoidal wave was input to the loudspeaker via a phone connector. We observed displacement of the loudspeaker diaphragm vibrating by the system. We also succeeded in estimating vibration frequency of the loudspeaker diaphragm by applying frequency analysis to the experimental results.

Paper Details

Date Published: 13 November 2014
PDF: 6 pages
Proc. SPIE 9279, Real-time Photonic Measurements, Data Management, and Processing, 92790V (13 November 2014); doi: 10.1117/12.2073659
Show Author Affiliations
T. Kakue, Chiba Univ. (Japan)
Y. Endo, Chiba Univ. (Japan)
T. Shimobaba, Chiba Univ. (Japan)
T. Ito, Chiba Univ. (Japan)

Published in SPIE Proceedings Vol. 9279:
Real-time Photonic Measurements, Data Management, and Processing
Bahram Jalali; Ming Li; Keisuke Goda; Mohammad Hossein Asghari, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?