Micro-tip Cantilever as Low Frequency Microphone

被引：18

作者：

Dass, Sumit ^{[1
]}

Jha, Rajan ^{[1
]}

机构：

[1] Indian Inst Technol Bhubaneswar, Sch Basic Sci, Nanophoton & Plasmon Lab, Khurja 752050, India

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

关键词：

SENSOR; HYDROPHONE;

D O I：

10.1038/s41598-018-31062-9

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We propose a very compact diaphragm free optical microphone consisting a tapered micro-tip in cantilever configuration for detection of low frequency acoustic signals. The change in the light coupling between the micro-tip and the source fiber caused by the acoustic pressure is utilized to detect the external acoustic signal. The sensitivity and working range of the sensor depend on three key factors, the length of the micro-tip cantilever, the distance between the micro-tip and SMF, and the offset between the micro-tip central axis and SMF central axis. Hence, by changing any of these parameters, the performance of the sensor can be easily tuned. Experimental results show that for a cantilever length of 15 mm, the probe has a maximum acoustic sensitivity of 10.63 mV/Pa or - 159.5 dB re 1 V/mu Pa, noise-limited minimum detectable pressure of 19.1 mPa/root Hz and the linear frequency range is 0-400 Hz. The SMF only structure along with photodetector-based interrogation makes this acoustic sensor economical.

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