Design of a slab waveguide multiaperture spectrometer for field observations

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Journal titleCanadian Aeronautics and Space Journal
Pages5358; # of pages: 6
SubjectData processing algorithms; Detector arrays; Fabrication errors; Field observations; In-phase; Limb-viewing; Multi aperture; Multi-aperture spectrometer; Multi-mode interference; Non-uniformities; Output couplers; Performance assessment; Prototype instrument; Retrieval algorithms; Slab waveguides; Stress induced birefringence; Wavebands; Waveguide device; Waveguide spectrometers; Algorithms; Data handling; Design; Instruments; Remote sensing; Spectrometry; Waveguides; Spectrometers
AbstractThe concept and design of a new type of waveguide device, a multiaperture Fourier-transform planar waveguide spectrometer, implemented as a prototype instrument is presented. The spectrometer's objective is to demonstrate the ability of the new slab waveguide technology for application in remote-sensing instruments. The spectrometer will use a limb-viewing configuration to detect the 1.36μm waveband allowing the concentrations of water vapor in Earth's atmosphere to be measured. The most challenging aspects of the design, assembly, and calibration are presented. Focus will be given to the effects of packaging the spectrometer and interfacing to the detector array. Stress-induced birefringence will affect the performance of the waveguides, therefore, the design of a stress-free mounting over a range of temperatures is important. Spectral retrieval algorithms will have to correct for expected fabrication errors in the waveguides. Data-processing algorithms will also be developed to correct for nonuniformities of input brightness through the array, making use of multimode interference output couplers to capture both the in-phase and anti-phase interferometer outputs. A performance assessment of an existing breadboard spectrometer will demonstrate the capability of the instrument. © 2011 CASI.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences
Peer reviewedYes
NPARC number21271151
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Record identifier6fa1c54d-7dcf-4b98-908a-7399c15434d0
Record created2014-03-24
Record modified2016-05-09
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