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Fast and Accurate Exhaled Breath Ammonia Measurement

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Published on: June 11, 2014

Air-gap fiber-optic ammonia gas sensor.

S Kar¹, M A Arnold

¹Department of Chemistry, University of Iowa, Iowa city, IA 52242, U.S.A.

|May 1, 1993

Summary

This study introduces a novel air-gap fiber-optic gas sensor for ammonia detection. Optimal sensor design prioritizes internal solution thickness and indicator dye concentration for effective ammonia sensing.

Area of Science:

Optoelectronics
Chemical Sensing
Analytical Chemistry

Background:

Fiber-optic sensors offer sensitive detection methods.
Air-gap designs can enhance sensor performance by isolating components.
Ammonia sensing is crucial for environmental and industrial monitoring.

Purpose of the Study:

To evaluate a novel fiber-optic gas sensing arrangement utilizing an air-gap design.
To investigate the impact of critical design parameters on sensor performance for ammonia detection.

Main Methods:

A fiber-optic gas sensor with two air-gaps was designed and fabricated.
The sensor measures the fluorescence of an internal solution exposed to ammonia.
Various air-gap lengths, internal solution thickness, and indicator dye concentrations were tested.

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Main Results:

The air-gap length between the internal solution and the fiber-optic probe significantly influences response magnitude.
The air-gap length between the internal solution and the sample has minimal impact on sensor performance.
Internal solution thickness and indicator dye concentration are key parameters for optimizing sensor design.

Conclusions:

The novel air-gap fiber-optic sensor design shows promise for ammonia detection.
Sensor optimization requires careful consideration of internal solution properties and probe-to-solution gap.
Further research can refine this design for improved gas sensing applications.