Optics and Photonics Seminar Series: Snapshot Hyperspectral Imaging Fourier Transform (SHIFT) Spectrometer
Wednesday, February 13, 2013
1:15 pm - 2:15 pm
Hudson Hall 125
Michael W. Kudenov, Ph.D., Assistant Professor, North Carolina State University
The design and implementation of a Snapshot Hyperspectral Imaging Fourier Transform (SHIFT) spectrometer is presented. The sensor is based on a multiple-image Fourier transform spectrometer (FTS), originally developed by A. Hirai; however, the presented device offers significant advantages over her original implementation. Namely, its birefringent nature creates a common-path interferometer that is ultra-compact, insensitive to vibration, and offers greater radiometric throughput. The addition of polarization grating technology also enables, for the first time, a spatial heterodyning capability within a polarization FTS. To this end, the theory of the birefringent FTS is provided, followed by details of its specific embodiment and a description of our laboratory prototype. Spectral measurements of gas discharge lamps are provided and these spectra are subsequently verified against a calibrated Ocean Optics USB2000 spectrometer. Additional data were collected both outdoors and of a rat esophagus ex vivo, demonstrating the sensor¿s ability to resolve spectral signatures both outdoors and in fluorescence imaging.