Fourier Transform Spectroscopy in Atmospheric Analysis
Summary
Fourier transform spectroscopy (FTS) has become an indispensable tool for the quantification and monitoring of atmospheric constituents. By measuring the interference pattern—known as an interferogram—produced when light beams experience varying optical path differences, FTS applications recover detailed absorption spectra across wide spectral bands using a mathematical Fourier transform. In atmospheric science, this approach enables high‐resolution detection of trace gases such as carbon dioxide, methane and ozone, whose absorption features in the near- and mid-infrared contain critical information on concentration, temperature and pressure profiles. FTS instruments span ground-based observatories, airborne platforms and spaceborne sensors, offering broad spatial and temporal coverage for global change studies. Recent advances in compact, static interferometer designs have reduced moving parts, improving instrument stability and permitting real-time measurements. Enhanced spectral reconstruction algorithms and micro-optical components deliver resolving powers exceeding 50 000 while maintaining signal-to-noise ratios sufficient for detecting minute gas perturbations. These capabilities support applications ranging from urban emission mapping to stratospheric chemistry and diurnal boundary-layer dynamics. The modularity of modern FTS systems also facilitates integration with radiometric and lidar sensors, fostering multiparameter assessments of aerosol loading, greenhouse-gas fluxes and air-quality trends on regional to planetary scales.
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Fourier Transform Spectroscopy in Atmospheric Analysis publication trend
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Technical terms
Fourier transform spectroscopy: A technique that derives spectral information by measuring the interference pattern of light and applying a mathematical Fourier transform to recover the spectrum.
Interferogram: The recorded signal produced by the superposition of two or more light beams with varying optical path differences, containing information on spectral content.
Spectral resolution: The ability of a spectroscopic system to distinguish between closely spaced wavelengths, typically defined as the smallest difference in wavenumber that can be separated.
Resolving power: The ratio of a spectrometer’s operating wavelength to its minimum resolvable wavelength difference, indicating its capacity to discriminate fine spectral features.
Etendue: A property of an optical system that describes how spread out light is in area and angle, influencing throughput and sensitivity.
References
- Performance-Enhanced Static Modulated Fourier Transform Spectrometer with a Spectral Reconstruction. Sensors (2023).
- Optical Design and Investigation of a Dual-Interference Channels and Bispectrum Static Fourier-Transform Imaging Spectrometer Based on Stepped Micro-Mirror. IEEE Access (2021).
- Medium-Wave Infrared Static Fourier Transform Spectrometer Based on Micro-Optical Elements. IEEE Access (2021).
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