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Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Published on: September 7, 2019

Calibration algorithm for Fourier transform spectrometer with thermal instabilities.

Simon Turbide¹, Tracy Smithson

¹Defence Research and Development Canada, 2459 Pie-XI Nord, Val-Belair, Quebec, Canada. simon.turbide@drdc-rddc.gc.ca

|June 12, 2010

Summary

This summary is machine-generated.

A new algorithm corrects Fourier transform spectrometer data affected by zero path difference shifts, improving spectral accuracy for systems with thermal instability. This method ensures reliable calibration even with minor shifts.

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Area of Science:

Spectroscopy
Optical Engineering
Signal Processing

Background:

Complex domain calibration is vital for correcting Fourier transform spectrometer (FTS) data, specifically amplitude and phase spectra.
Standard calibration methods fail when a zero path difference (ZPD) shift occurs between scene and blackbody interferograms, often due to thermal instabilities.
Even sub-sampling point ZPD shifts can lead to significant spectral discrepancies between forward and reverse interferometer sweeps.

Purpose of the Study:

To develop a novel algorithm for complex calibration that effectively handles zero path difference (ZPD) shifts.
To ensure accurate spectral data correction in Fourier transform spectroscopy systems prone to thermal variations.
To maintain real-time processing capabilities despite the introduction of ZPD shift correction.

Main Methods:

Developed a new algorithm specifically designed for complex calibration in the presence of ZPD shifts.
Algorithm accounts for spectral differences arising from ZPD shifts between scene and calibration interferograms.
Ensured the algorithm's suitability for real-time applications, considering computational constraints.

Main Results:

The developed algorithm successfully corrects spectra even with ZPD shifts.
Demonstrated that the algorithm mitigates large disagreements in spectra evaluated from different interferometer sweep directions caused by ZPD shifts.
Validated the algorithm's effectiveness while adhering to real-time processing requirements.

Conclusions:

The new complex calibration algorithm effectively addresses ZPD shift issues in Fourier transform spectroscopy.
This advancement improves the accuracy and reliability of spectral data from systems experiencing thermal instabilities.
The algorithm offers a practical solution for real-time spectral calibration in challenging environments.