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Updated: Dec 27, 2025
08:44
Fabrication and Testing of Photonic Thermometers
Published on: October 24, 2018
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A photonic pH sensor based on photothermal spectroscopy
Matthew R Hartings1, Nathan J Castro2,3, Kathryn Gill2
1Department of Chemistry, American University, Washington, DC, USA.
Sensors and Actuators. B, Chemical
|March 3, 2020
Summary
A new fiber optic pH sensor uses anthocyanins and fiber Bragg gratings (FBG) to measure pH in biological samples. This innovative platform shows promise for advanced bio-industrial and tissue engineering applications.
Area of Science:
- Biomedical Engineering
- Optical Sensing Technologies
- Analytical Chemistry
Background:
- Accurate pH determination is crucial for bio-industrial processing, tissue engineering, and intracellular measurements.
- Traditional pH probes face limitations in specialized environments.
- Development of novel pH sensing platforms is essential for technological advancement.
Purpose of the Study:
- To introduce a novel fiber optic-based platform for pH measurement.
- To utilize anthocyanins as pH-sensitive chromophores and fiber Bragg gratings (FBG) for signal transduction.
- To assess the platform's viability for biological sample analysis.
Main Methods:
- A fiber optic platform was developed, incorporating fiber Bragg gratings (FBG) sensitive to temperature changes.
- Anthocyanins were used as pH-sensitive chromophores, correlating light absorption to heat release.
- The platform was tested by coating optical fibers with anthocyanin-loaded polyethylene glycol diacrylate (PEG-DA) and measuring FBG signal shifts across a pH range of 2.5 to 10.
Main Results:
- The platform demonstrated a correlation between anthocyanin light absorption, heat release, and FBG signal shifts across a pH range of 2.5 to 10.
- Coating the fiber with anthocyanin-loaded PEG-DA enhanced the sensor's signal magnitude compared to solution-based measurements.
- The FBG peak redshifted with increasing temperature, indicating successful heat detection.
Conclusions:
- The developed fiber optic platform is a viable tool for assessing pH in biological samples.
- Incorporating anthocyanins within a PEG-DA matrix improves sensor performance.
- Further optimization of this platform can lead to advanced pH sensing capabilities for various applications.
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