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Proceedings Paper

Autofocusing research on terahertz off-axis digital holography
Author(s): Qi Li; Jia-Qi Hu; Yun-Da Li; Kai Xue
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Paper Abstract

Terahertz (THz) digital holography is a combination of THz technology and digital holography which has drawn wide attention. Exact measurements of real recording distances in terahertz (THz) digital holography are important. Autofocusing experimental researches have been conducted based on the holograms in THz off-axis digital holography. Five criterion functions are utilized in this paper. Autofocusing performance of these criterion functions has been analyzed and compared by changing the numbers of the superposition frames of holograms. Experiment results show that five criterion functions all have preferable autofocusing performance with the 5-frame averaged holograms; standard deviation–based correlation criterion function has the worst autofocusing performance.

Paper Details

Date Published: 3 December 2014
PDF: 6 pages
Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 929708 (3 December 2014); doi: 10.1117/12.2069590
Show Author Affiliations
Qi Li, Harbin Institute of Technology (China)
Jia-Qi Hu, Harbin Institute of Technology (China)
Yun-Da Li, Harbin Institute of Technology (China)
Kai Xue, Harbin Institute of Technology (China)


Published in SPIE Proceedings Vol. 9297:
International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors
Jurgen Czarske; Shulian Zhang; David Sampson; Wei Wang; Yanbiao Liao, Editor(s)

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