Performance comparison of aperture codes for multimodal, multiplex spectroscopy.
We experimentally evaluate diverse static independent column codes in a coded aperture spectrometer. The performance of each code is evaluated based on the signal-to-noise ratio (SNR), defined as the peak value in the spectrum to the standard deviation of the background noise, as a function of subpixel vertical misalignments. Among the code families tested, an S-matrix-based code produces spectral reconstructions with the highest SNR. The SNR is least sensitive to vertical subpixel misalignments on the detector with a Hadamard-matrix-based code. Finally, the increased sensitivity of a spectrometer using a coded aperture instead of a slit is demonstrated.
Duke University Fitzpatrick Institute for Photonics, Box 90291, Durham, North Carolina 27708, USA.
Ashwin A
AA
Wagadarikar
Michael E
ME
Gehm
David J
DJ
Brady
D000465:Algorithms; D004867:Equipment Design; D007089:Image Enhancement; D007090:Image Interpretation, Computer-Assisted; D015233:Models, Statistical; D008962:Models, Theoretical; D012031:Refractometry; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D012984:Software; D013053:Spectrophotometry / Q000295:instrumentation* / Q000379:methods*; D013057:Spectrum Analysis