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THz Imaging Compressive sensing Hadamard spectroscopy THz Laser DMD Hadamard matrices Experimental model v1.0 Experimental model v2.0 Experimental model v3.0
THz Imaging
THz and IR radiations are nowadays tools of high interest for the scientific world due to their capability to emphasize the molecular structure of matter by spectroscopic means. THz radiation, also known as sub-millimeter radiation, T-waves, T-rays or T-light, comprises electromagnetic waves in the 0.1 - 30 THz frequency range.
For imaging applications we decided to study Hadamard coding method. The Hadamard Transform (HT) imaging is one of the most important modulation techniques developed in the last century. Hadamard multiplexing is well suited to multiplexed imaging. It is performed by a Hadamard mask, which is a multi-slit array; the slits are made transparent or opaque.
The optical layout of imaging for our experiment is presented in the image bellow.
REFERENCES:
  1. C.Pradere et al. Thermal converter for quantitative, 2D and 3D real-time TeraHertz imaging, Proceeding of 10th International Conference on Quantitative Infrared Thermography, ISBN 978-2-9809199-1-6, pp. 993 (2010)
  2. Adrian Dobroiu, et al., Terahertz-wave sources and imaging applications, Measurement Science and Technology, Vol. 17 (11), pp. R161 (2006)
  3. Furxhi Orges et al., Image plane coded aperture detectors for THz imaging, Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International, pp. 1-3 (2012)
  4. Peter H. Siegel, Thz instruments for space, IEEE Transactions on Antennas and Propagation, Vol. 55 (11), pp. 2957-2965 (2007)
  5. Matthias Pospiech, Terahertz Technology - an Overview, University of Sheffield, TU Kaiserslautern (2003)
  6. Serge L. Shishkin, Fast and Robust Compressive Sensing Method Using Mixed Hadamard Sensing Matrix, IEEE Journal on Emerging and Selected Topics in Circuits and Systems, Vol. 2, Issue 3, pp. 353-361 (2012)
∴ Facts
Title: Compressive THz Imaging and Hadamard Spectroscopy for Space Applications
Project No: 17/19.11.2012
Project type: CDI STAR Project
Starting date: Nov 2012
Duration: 36 months
Partners: 2
INFLPR - Coordinator
CEO Space Tech - Partner
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