A study on the optical diaphragm using magnetic fluid and a permanent magnet

被引：0

作者：

Sudo, Seiichi ^{[1
]}

Shinozaki, Michihiro ^{[1
]}

Nishiyama, Hideya ^{[2
]}

机构：

[1] Akita Prefectural Univ, Dept Machine Intelligence & Syst Engn, Yurihonjo 0150055, Japan

[2] Tohoku Univ, Inst Fluid Sci, Sendai, Miyagi 980, Japan

来源：

INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS | 2014年 / 46卷 / 04期

基金：

日本学术振兴会;

关键词：

Magnetic fluids; optical diaphragm; interfacial phenomena; alternating magnetic field; FIELD;

D O I：

10.3233/JAE-140101

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper is concerned with a novel optical diaphragm using magnetic fluid and a permanent magnet. The optical diaphragm consisting of a kerosene-based magnetic fluid and a small ring-shaped Nd2Fe14B permanent magnet was designed. The magnetic fluid diaphragm was driven by the external magnetic field. The experimental apparatus consists of the test magnetic fluid diaphragm system and the optical measurement system. Frequency characteristics of the magnetic fluid diaphragm in the alternating magnetic field were studied experimentally. The alternating magnetic field was generated by applying alternating current voltage to a Helmholtz coil. The alternating current signal was supplied from the frequency synthesizer. The dynamic responses of magnetic fluid diaphragm were analyzed with a high-speed video camera system. It was revealed that the amplitude of magnetic fluid hole oscillation depended on the frequency of magnetic field. The effect of the applied voltage on the amplitude of hole oscillation was also revealed.

引用

页码：943 / 949

页数：7

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