Extrinsic Fabry-Perot interferometer fiber-optic microphone

被引：30
|
作者：
Furstenau, N [1 ]
Horack, H [1 ]
Schmidt, W [1 ]
机构：
[1] German Aerosp Ctr DLR, Inst Flight Guidance, D-38022 Braunschweig, Germany
来源：
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 1998年 / 47卷 / 01期
关键词：
acoustic; classification; fiber-optics; interferometer; microphone; sensors;
D O I：
10.1109/19.728806
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：
In this paper we describe a new fiber-optic microphone developed as a passive acoustic sensor for traffic monitoring and vehicle classification, It is based on a fiber-optic extrinsic Fabry-Perot (FP) microinterferometer coupled to an external membrane for modulating the FP cavity length and a low coherent superluminescent diode as light source. The frequency characteristic as compared with a standard condenser microphone exhibits a sensitivity range of more than 80 dB between 100 Hz and 15 kHz. Initial results are presented demonstrating acoustic monitoring of aircraft via their characteristic noise spectra using downleads of km length.
引用
收藏
页码：138 / 142
页数：5
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