Design and fabrication of an ultraviolet-visible coded aperture snapshot spectral imager

We describe the design and performance of a coded aperture spectral imager with a wide spectral range of 320 to 700 nm over 87 channels and 1988-by-1988 pixels of spatial resolution. A custom-designed relay lens was designed and built for the system, including a dispersive prism element in the collimated space of the relay lens. The optical design process, prescription, and performance are reported for the entire system, including calibration and alignment. Simulations of high-resolution spectral images are conducted to verify the reconstruction algorithm and relative resolution of the instrument compared to ground truth data. Measured data were taken with the instrument using both a random coded aperture and standard slit for spatial resolution comparisons. Finally, reconstructed spectral images from the instrument are presented of a sunlight-illuminated flower from 360 to 700 nm.

[1]  Daniel W. Wilson,et al.  Snapshot hyperspectral imaging in ophthalmology. , 2007, Journal of biomedical optics.

[2]  Liang Gao,et al.  Snapshot Image Mapping Spectrometer (IMS) with high sampling density for hyperspectral microscopy , 2010, Optics express.

[3]  José M. Bioucas-Dias,et al.  A New TwIST: Two-Step Iterative Shrinkage/Thresholding Algorithms for Image Restoration , 2007, IEEE Transactions on Image Processing.

[4]  M. Descour,et al.  Computed tomography-based spectral imaging for fluorescence microscopy. , 2001, Biophysical journal.

[5]  Norman B. Nill.  Conversion Between Sine Wave and Square Wave Spatial Frequency Response of an Imaging System , 2001 .

[6]  Peter A. Mitchell,et al.  Hyperspectral digital imagery collection experiment (HYDICE) , 1995, Remote Sensing.

[7]  David J. Brady,et al.  Multiframe image estimation for coded aperture snapshot spectral imagers. , 2010, Applied optics.

[8]  Xiaobai Sun,et al.  Video rate spectral imaging using a coded aperture snapshot spectral imager. , 2009, Optics express.

[9]  Alistair Gorman,et al.  Generalization of the Lyot filter and its application to snapshot spectral imaging. , 2010, Optics express.

[10]  Xavier Otazu,et al.  A Wavelet-Based Method for the Determination of the Relative Resolution Between Remotely Sensed Images , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[11]  M. Descour,et al.  Large-image-format computed tomography imaging spectrometer for fluorescence microscopy. , 2001, Optics express.