Hybrid sampling approach for imaging Fourier-transform spectrometry

Area of Science:

• Spectroscopy
• Optical Engineering
• Data Acquisition

Background:

• Fourier-transform spectrometry (FTS) traditionally uses time- or position-sampling techniques.
• Existing methods can lead to high data loads or sampling errors, particularly in imaging spectrometers.
• Integrating detectors, like CCD cameras, introduce delays that complicate traditional sampling.

Purpose of the Study:

• To introduce a new hybrid interferogram sampling technique for Fourier-transform spectrometry.
• To minimize data load and enable postcorrection of sampling errors.
• To adapt FTS for imaging spectrometers and integrating detectors.

Main Methods:

• A hybrid sampling approach combining equidistant optical path difference triggering with high-resolution digital clock time-referencing.
• Implementation of a postcorrection scheme to address sampling errors.
• Application to imaging spectrometers and systems with integrating detectors.

Main Results:

• Demonstration of a new interferogram sampling method for FTS.
• Significant reduction in dataload compared to traditional methods.
• Successful postcorrection of sampling errors, enhancing data accuracy.
• Adaptability to imaging spectrometers and integrating detectors like CCD cameras.

Conclusions:

• The hybrid sampling technique offers an efficient and accurate method for Fourier-transform spectrometry.
• This approach is particularly beneficial for advanced applications like massively parallel spatial sampling in imaging spectrometers.
• The technique effectively manages challenges posed by integrating detectors, improving spectral data quality.