Compressive sensing is a method for efficiently acquiring and reconstructing sparsely supported system. Fourier transform hyperspectral imaging spectrometers require significant quantities of data and long sampling times to produce high spectral resolution images. However, by utilizing compressive sensing techniques, the number of samples required to reproduce a high-resolution spectrum can be vastly decreased. These hyperspectral imagers can be miniaturized and used for a variety of applications including biomedical imaging, personal diagnostics, endoscopic diagnostics, and handheld materials identification. Specialized multi-axis voice coil and piezoelectric actuators with custom hybrid control systems were used for high speed mirror positioning. In addition, high precision custom tip, tilt, and translation measurement systems were designed. With these hyperspectral imagers, non-uniform sampling, adaptive under-sampling, and recursive sampling methods can be implemented to further decrease sampling times for real-time hyperspectral videos.
Recently, our work has focused on developing high precision interferometric methods for measuring the index of refraction in challenging, high-enthalpy gaseous environments above 6000 K.
Selected Publications
- (*) G. T. Wang and Y. C. Mazumdar, “Quadrature Fringe Imaging Interferometer for Index of Refraction Measurements,” OSA Imaging and Applied Optics Conference: Laser Applications to Chemical, Security and Environmental Analysis, 2020. [In Press]
- Y. Chen and I. W. Hunter, “Design of a Miniature Hyperspectral Imaging Fourier Transform Spectrometer For Endoscopy,” OSA Imaging and Applied Optics Conference: Imaging Systems and Applications, paper IW1E.2, 2016. [http://dx.doi.org/10.1364/ISA.2016.IW1E.2]
- Y. Chen, “Miniature, high-speed imaging transform spectrometers and advanced sampling algorithms,” Ph.D. Thesis, Massachusetts Institute of Technology, 2015. [https://dspace.mit.edu/handle/1721.1/97835]
- Y. Chen and I. W. Hunter, “Systems, Apparatus, and Methods for Spectral Imaging,” U.S. Patent 10,444,007 B2, Provisional Patent Application No. 62/192,824. [http://www.freepatentsonline.com/10444007.html]
- I. W. Hunter and Y. Chen, “Methods, systems, and apparatus for imaging spectroscopy,” U.S. Patent US9681798 B2. WO Patent Application WO/2014/190027. [https://www.google.com/patents/US9681798] [http://www.freepatentsonline.com/9681798.html] [http://patentscope.wipo.int/search/en/WO2014190027]. U. S. Patent Application US20160066775 A1 [https://www.google.com/patents/US20160066775].