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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 28 — Oct. 1, 2010
  • pp: 5262–5270

Absolute distance measurement of optically rough objects using asynchronous-optical-sampling terahertz impulse ranging

Takeshi Yasui, Yasuhiro Kabetani, Yoshiyuki Ohgi, Shuko Yokoyama, and Tsutomu Araki  »View Author Affiliations

Applied Optics, Vol. 49, Issue 28, pp. 5262-5270 (2010)

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We report on a real-time terahertz (THz) impulse ranging (IPR) system based on a combination of time-of-flight measurement of pulsed THz radiation and the asynchronous-optical-sampling (ASOPS) tech nique. The insensitivity of THz radiation to optical scattering enables the detection of various objects having optically rough surfaces. The temporal magnification capability unique to ASOPS achieves precise distance measurements of a stationary target at an accuracy of 551 μm and a resolution of 113 μm . Furthermore, ASOPS THz IPR is effectively applied to real-time distance measurements of a moving target at a scan rate of 10 Hz . Finally, we demonstrate the application of ASOPS THz IPR to a shape measurement of an optically rough surface and a thickness measurement of a paint film, showing the promise of further expanding the application scope of ASOPS THz IPR. The reported method will become a powerful tool for nondestructive inspection of large-scale structures.

© 2010 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(280.3400) Remote sensing and sensors : Laser range finder
(280.5600) Remote sensing and sensors : Radar
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Remote Sensing and Sensors

Original Manuscript: June 23, 2010
Revised Manuscript: August 21, 2010
Manuscript Accepted: August 23, 2010
Published: September 22, 2010

Takeshi Yasui, Yasuhiro Kabetani, Yoshiyuki Ohgi, Shuko Yokoyama, and Tsutomu Araki, "Absolute distance measurement of optically rough objects using asynchronous-optical-sampling terahertz impulse ranging," Appl. Opt. 49, 5262-5270 (2010)

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