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Related Experiment Video

Updated: May 16, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy

Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 3, 2011

Compact acoustic sensor based on air-backed mandrel coiled with optical microfiber.

George Y Chen¹, Gilberto Brambilla, Trevor P Newson

¹Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK. gyc1g09@orc.soton.ac.uk

|November 21, 2012

Summary

We developed a compact acoustic sensor using an optical microfiber coiled around a mandrel. This sensor detects acoustic waves by measuring changes in light path length, offering high sensitivity in a small package.

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Area of Science:

Photonics
Acoustics
Sensor Technology

Background:

Optical microfibers offer unique properties for sensing applications.
Acoustic sensors are crucial for various monitoring and detection tasks.
Miniaturization of sensors is a key trend in modern technology.

Purpose of the Study:

To propose and demonstrate a novel compact acoustic sensor.
To leverage optical microfiber properties for acoustic wave detection.
To achieve high acoustic responsivity in a miniaturized sensor design.

Main Methods:

A 2 μm diameter, 35 mm length optical microfiber was coiled around a 3 mm diameter air-backed mandrel.
Acoustic waves were detected by measuring pressure-induced changes in the mandrel's diameter.
Phase modulation of light propagating in the microfiber was analyzed using a single-fiber polarimetric interferometer.

Main Results:

The sensor successfully detected acoustic waves through induced pressure variations.
Changes in mandrel diameter directly correlated with acoustic wave-induced pressure.
The compact microfiber-based sensor demonstrated high acoustic responsivity.

Conclusions:

The proposed compact acoustic sensor utilizing an optical microfiber is effective.
The sensor design allows for miniaturization without sacrificing acoustic detection performance.
This technology holds promise for advanced acoustic sensing applications.