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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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Longwave infrared (LWIR) coded aperture dispersive spectrometer.

C Fernandez, B D Guenther, M E Gehm

|June 18, 2009

Summary

We developed a novel longwave infrared spectrometer using a coded aperture for improved spectral analysis. This new design offers a mathematically defined pattern for precise source information mapping and spectral estimation.

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Area of Science:

Optics and Photonics
Spectroscopy
Infrared Technology

Background:

Traditional spectrometers often face limitations in resolution and complexity.
Longwave infrared (LWIR) spectroscopy requires specialized instrumentation for accurate analysis.
Aperture coding offers a potential method to enhance spectral information acquisition.

Purpose of the Study:

To introduce a static aperture-coded, dispersive longwave infrared (LWIR) spectrometer.
To demonstrate the effectiveness of a Hadamard mask for spatial and spectral mapping.
To compare the performance of a coded aperture with a traditional slit design.

Main Methods:

Utilized a static aperture-coded, dispersive LWIR spectrometer.
Employed a row-doubled Hadamard mask with transmissive and opaque openings.
Applied post-processing techniques for spectral estimation.
Conducted comparative experiments using a CO(2) laser source.

Main Results:

The coded aperture provides a mathematically well-defined pattern for mapping source information.
Post-processing successfully yielded spectral estimates of the source.
Demonstrated comparative experimental results showing the performance of the coded aperture versus a slit.

Conclusions:

The developed aperture-coded LWIR spectrometer is effective for spectral analysis.
Hadamard mask coding offers a robust method for spatial and spectral information encoding.
This technique shows promise for advanced emission spectroscopy applications.