All-optical low noise fiber Bragg grating microphone
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Bandutunga, Chathura P; Fleddermann, Roland; Gray, Malcolm B; Close, John D; Chow, Jong H
Description
We present an all-fiber design for a microphone using a fiber Bragg grating Fabry-Perot resonator attached to a diaphragm transducer. We analytically model and verify the fiber-diaphragm mechanical interaction, using the Hänsch-Couillaud readout technique to provide necessary sensitivity. We achieved a noise-equivalent strain sensitivity of 7.1×10<sup>-12</sup> ϵ/Hz, which corresponds to a sound pressure of 74 μPa/Hz at 1 kHz limited by laser frequency noise and yielding a signal-to-noise...[Show more]
Collections | ANU Research Publications |
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Date published: | 2016-07-13 |
Type: | Journal article |
URI: | http://hdl.handle.net/1885/107330 |
Source: | Applied optics |
DOI: | 10.1364/AO.55.005570 |
Access Rights: | Open Access |
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