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Optical fiber pH sensor based on a multimode interference device with polymer overlay.

P M Velasco-Bolom, J L Camas-Anzueto, D Lopez-Cortes

|September 14, 2023

Summary

This summary is machine-generated.

This study presents a novel optical fiber pH sensor using multimode interference. Chemical etching enhances sensitivity, offering a rapid and linear response for accurate pH monitoring.

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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Area of Science:

Optoelectronics
Chemical Sensing
Materials Science

Background:

Accurate pH monitoring is crucial in various scientific and industrial applications.
Existing pH sensors may face limitations in response time, sensitivity, or reusability.
Optical fiber sensors offer advantages like remote sensing and immunity to electromagnetic interference.

Purpose of the Study:

To develop and characterize a highly sensitive optical fiber pH sensor.
To investigate the effect of structural modification on sensor performance.
To demonstrate a rapid and linear response for practical pH measurements.

Main Methods:

Fabrication of a multimode interference (MMI) optical fiber sensor.
Coating the no-core fiber (NCF) with polyallylamine hydrochloride and polyacrylic acid using a layer-by-layer (LbL) self-assembly method.
Chemical etching to reduce the NCF diameter and enhance sensitivity.

Main Results:

The optical fiber pH sensor demonstrated increased sensitivity from -0.31 nm/pH to -2 nm/pH after chemical etching.
A high linear response (R² = 0.997) was achieved over a broad pH range (5 to 11.3).
The sensor exhibited a rapid response time of less than 1 second.

Conclusions:

The developed optical fiber pH sensor shows significant potential for high-performance pH monitoring.
Chemical etching is an effective method for enhancing the sensitivity of NCF-based MMI sensors.
The sensor's rapid and linear response makes it suitable for real-time pH detection applications.