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A fiber optic ammonia sensor using a universal pH indicator.

Adolfo J Rodríguez1, Carlos R Zamarreño2, Ignacio R Matías3

  • 1Fiber and Integrated Optics Laboratory, Electronics Engineering Department, UAM Reynosa Rodhe, Universidad Autónoma de Tamaulipas, Carr. Reynosa-San Fernando S/N, Reynosa, Tamaulipas 88779, Mexico. arodriguez@uat.edu.mx.

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Summary

A novel fiber optic ammonia sensor utilizes a universal pH indicator for sensitive detection. Ratiometric measurements enhance signal stability against environmental fluctuations, ensuring reliable ammonia sensing.

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Area of Science:

  • Chemical Sensors
  • Optical Sensing
  • Materials Science

Background:

  • Ammonia sensors are crucial for environmental monitoring and industrial safety.
  • Existing sensors often face challenges with stability and accuracy in varying conditions.
  • Developing robust and reliable ammonia detection methods is an ongoing research area.

Purpose of the Study:

  • To fabricate a reliable and robust fiber optic ammonia sensor.
  • To leverage a universal pH indicator for broad-range ammonia sensitivity.
  • To enhance sensor performance through ratiometric measurements and a protective film.

Main Methods:

  • Fabrication of a fiber optic sensor using a universal pH indicator.
  • Embedding the indicator within a hydrophobic, gas-permeable Tecoflex® polyurethane film.
  • Utilizing ratiometric measurements based on the indicator's differential spectral response (peak at 650 nm, valley at 500 nm).

Main Results:

  • The universal pH indicator demonstrated sensitivity to ammonia across a wide wavelength range.
  • Ratiometric measurements effectively compensated for external disturbances like humidity and temperature.
  • The Tecoflex® film ensured sensor operation in dry conditions and prevented indicator leakage.

Conclusions:

  • The developed fiber optic ammonia sensor is reliable and robust.
  • The combination of a universal pH indicator and Tecoflex® film offers significant advantages for ammonia sensing.
  • This approach provides enhanced signal and stability for accurate ammonia detection.