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Title: Compact spatial heterodyne SWIR spectrometer for atmospheric CO2 monitoring
Author: Ikpaya, Ikpaya O.
Awarding Body: University of Surrey
Current Institution: University of Surrey
Date of Award: 2013
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With the global concern over climate change in recent years, there has been an increased interest in characterizing the sources, sinks and transport of greenhouse gases through the use of satellite data. Effective mapping of an atmospheric trace gas such ..a s carbon dioxide (C02) requires high precision (0.3% to 0.5%) measurements of gas concentration. This is usually achieved through identifying CO2 by its spectral absorption bands at 1.56 Ilm - 1.62 Ilm and 1.92 Ilm - 2.06 Ilm wavelength (Le. in the Short-Wave Infrared - SWIR) and distinguishing this from other greenhouse gases e.g. water vapour by using high resolution spectrometers (e.g. 0.27 cm-1 resolution at Full Width at Half Maximum (FWHM) at a relative signal-to-noise ratio (SNR) of300:1). These requirements impose severe design and technical challenges in terms of size, weight, power consumption and cost of instrument needed. Existing spaceborne instruments that meet required specifications are generally too large and expensive to consider flying on a microsatellite constellation, which if possible, would enable a much greater temporal resolution to be achieved. This thesis contributes to the state-of-the-art instrument design by developing a compact spatial heterodyne SWIR (COMSSWIR) Fourier Transform Spectrometer (FTS) that utilises the Spatial Heterodyne Spectrometer (SHS) technique for atmospheric CO2 monitoring. The SHS is similar to a conventional FTS but has the mirrors replaced with fixed reflection gratings. This novel compact instrument uses a standard SHS in an echelle-mode SHS configuration to record interferogram on 2-dimensions of the detector for broadband applications. It is designed to cover the wavelength range of 1599 nm to 2060 nm at an appropriate spectral resolution.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available