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Static Fourier-transform ultraviolet spectrometer for gas detection.

J Courtial, B A Patterson, W Hirst

|May 1, 1997

Summary

A novel static Fourier-transform ultraviolet spectrometer using Wollaston prisms was developed for gas detection. It achieved a 0.2 ppm detection limit for hydrogen sulfide and sulfur dioxide over 5 meters.

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Area of Science:

Spectroscopy
Analytical Chemistry
Optical Engineering

Background:

Fourier-transform spectroscopy (FTS) is a powerful analytical technique.
Traditional FTS instruments often involve moving parts, increasing complexity and cost.
Developing static, compact spectrometers is desirable for field applications.

Purpose of the Study:

To design, construct, and evaluate a static Fourier-transform ultraviolet spectrometer.
To demonstrate its capability for sensitive gas detection.
To establish performance metrics such as detection limits.

Main Methods:

Utilized Wollaston prisms to create a spatially encoded interferogram.
Employed a detector array for interferogram acquisition.
Operated the spectrometer with a deuterium light source for ultraviolet measurements.
Evaluated performance using hydrogen sulfide and sulfur dioxide gas samples.

Main Results:

Successfully designed and constructed a static Fourier-transform ultraviolet spectrometer.
Demonstrated effective gas detection capabilities.
Achieved a detection limit of 0.2 parts per million (ppm) for hydrogen sulfide and sulfur dioxide.
The detection limit was measured over a 5-meter path length with a 1-second integration time.

Conclusions:

The static Fourier-transform ultraviolet spectrometer based on Wollaston prisms is a viable technology for gas sensing.
The instrument offers high sensitivity and a compact design.
Potential applications include environmental monitoring and industrial process control.