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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 9, Iss. 5 — Apr. 29, 2014

High-speed terahertz imaging toward food quality inspection

Gyeongsik Ok, Kisang Park, Hyun Jung Kim, Hyang Sook Chun, and Sung-Wook Choi  »View Author Affiliations

Applied Optics, Vol. 53, Issue 7, pp. 1406-1412 (2014)

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In contrast to conventional x-ray food inspection systems that have difficulty in detecting low-density materials, a terahertz imaging system can even identify insects and plastics embedded in a food matrix. A reflection-mode continuous-wave terahertz imaging system was therefore developed for application to food quality inspection, which requires fast, compact, and low-cost detection. High-speed operation of the terahertz imaging system was achieved through the use of a beam-steering tool. A reasonable compromise between the spatial resolution and the scan length of an aspheric f -theta scanning lens could be achieved by optimizing the lens parameters.

© 2014 Optical Society of America

OCIS Codes
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Imaging Systems

Original Manuscript: December 6, 2013
Revised Manuscript: January 23, 2014
Manuscript Accepted: January 27, 2014
Published: February 27, 2014

Virtual Issues
Vol. 9, Iss. 5 Virtual Journal for Biomedical Optics

Gyeongsik Ok, Kisang Park, Hyun Jung Kim, Hyang Sook Chun, and Sung-Wook Choi, "High-speed terahertz imaging toward food quality inspection," Appl. Opt. 53, 1406-1412 (2014)

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  1. Y. Lee, S. Choi, S. Han, D. H. Woo, and H. S. Chun, “Detection of foreign bodies in foods using continuous wave terahertz imaging,” J. Food Prot. 75, 179–183 (2012). [CrossRef]
  2. M. Edwards, ed. Detecting Foreign Bodies in Food (Woodhead, 2004).
  3. M. C. Edwards and M. F. Stringer, and the Breakdowns in Food Safety Group, “Observations on patterns in foreign material investigations,” Food Control 18, 773–782 (2007).
  4. M. S. Nielsen, T. Lauridsen, L. B. Christensen, and R. Feidenhans’l, “X-ray dark-field imaging for detection of foreign bodies in food,” Food Control 30, 531–535 (2013).
  5. P. Y. Han, G. C. Cho, and X. C. Zhang, “Time-domain transillumination of biological tissues with terahertz pulses,” Opt. Lett. 25, 242–244 (2000). [CrossRef]
  6. M. C. Kemp, “Millimetre wave and terahertz technology for the detection of concealed threats–a review,” Proc. SPIE 6402, 64020D (2006). [CrossRef]
  7. C. Jördens and M. Koch, “Detection of foreign bodies in chocolate with pulsed terahertz spectroscopy,” Opt. Eng. 47, 037003 (2008). [CrossRef]
  8. N. Karpowicz, H. Zhong, C. Zhang, K. Lin, J. S. Hwang, J. Xu, and X. C. Zhang, “Compact continuous-wave sub-terahertz system for inspection applications,” Appl. Phys. Lett. 86, 054105 (2005). [CrossRef]
  9. M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics 1, 97–105 (2007). [CrossRef]
  10. A. A. Gowen, C. O’Sullivan, and C. P. O’Donnell, “Terahertz time domain spectroscopy and imaging: emerging techniques for food process monitoring and quality control,” Trends Food Sci. Technol. 25, 40–46 (2012). [CrossRef]
  11. B. B. Hu and M. C. Nuss, “Imaging with terahertz waves,” Opt. Lett. 20, 1716–1718 (1995). [CrossRef]
  12. W. L. Chan, J. Deibel, and D. M. Mittleman, “Imaging with terahertz radiation,” Rept. Progr. Phys. 70, 1325–1379 (2007). [CrossRef]
  13. G. Ok, S. W. Choi, K. H. Park, and H. S. Chun, “Foreign object detection by sub-terahertz quasi-Bessel beam imaging,” Sensors 13, 71–85 (2013).
  14. T. M. Goyette, J. C. Dickinson, K. J. Linden, W. R. Neal, C. S. Joseph, W. J. Gorveatt, J. Waldman, R. Giles, and W. E. Nixon, “1.56  terahertz 2-frames per second standoff imaging,” Proc. SPIE 6893, 68930J (2008). [CrossRef]
  15. Q. Song, Y. J. Zhao, A. R. Sanchez, C. L. Zhang, and X. H. Liu, “Fast continuous terahertz wave imaging system for security,” Opt. Commun. 282, 2019–2022 (2009). [CrossRef]
  16. S. Katletz, M. Pfleger, H. Pühringer, N. Vieweg, B. Scherger, B. Heinen, M. Koch, and K. Wiesauer, “Efficient terahertz en-face imaging,” Opt. Express 19, 23042–23053 (2011). [CrossRef]
  17. N. Karpowicz, H. Zhong, J. Xu, K. I. Lin, J. S. Hwang, and X. C. Zhang, “Comparison between pulsed terahertz time-domain imaging and continuous wave terahertz imaging,” Semicond. Sci. Technol. 20, S293–S299 (2005). [CrossRef]
  18. L. Thrane, R. H. Jacobsen, P. Uhd Jepsen, and S. R. Keiding, “THz reflection spectroscopy of liquid water,” Chem. Phys. Lett. 240, 330–333 (1995). [CrossRef]
  19. L. F. Marshall, ed. Handbook of Optical and Laser Scanning (Marcel Dekker, 2004).

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