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Related Experiment Video

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Design and Fabrication of an Optical Fiber Made of Water

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Frustrated-total-internal-reflection multimode fiber-optic hydrophone.

W B Spillman, D H McMahon

|March 11, 2010

Summary

This summary is machine-generated.

A novel multimode fiber-optic hydrophone utilizing frustrated total internal reflection was developed. This acoustic sensor demonstrates high sensitivity, detecting minimal pressure and static displacements, and is compatible with existing fiber-optic systems.

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Area of Science:

Optoelectronics
Acoustic Sensing
Fiber Optics

Background:

Fiber-optic hydrophones offer advantages in harsh environments.
Frustrated total internal reflection (FTIR) is a viable principle for optical sensing.

Purpose of the Study:

To construct and evaluate a multimode fiber-optic hydrophone.
To assess the hydrophone's sensitivity to acoustic waves and static displacements.
To determine the minimum detectable pressure and displacement.

Main Methods:

Fabrication of a multimode fiber-optic hydrophone based on FTIR.
Testing the device's response to acoustic waves in water.
Measuring sensitivity to applied static displacements in air.
Comparing experimental results with theoretical predictions.

Main Results:

The hydrophone's sensitivity to acoustic waves aligns with predictions from static displacement tests.
The minimum detectable pressure was measured at 62 dB re 1 µPa at 500 Hz.
The sensor can detect static displacements as small as 4.8 x 10⁻³ Å.
The device exhibits compatibility with standard multimode fiber-optic components.

Conclusions:

The developed multimode fiber-optic hydrophone is a sensitive acoustic sensor.
The FTIR principle is effective for fiber-optic hydrophone design.
The sensor's performance is well-characterized and suitable for practical applications.