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

Takeshi Yasui1, Yasuhiro Kabetani, Yoshiyuki Ohgi

  • 1Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan. yasui@me.tokushima-u.ac.jp

Applied Optics
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PubMed
Summary

We developed a real-time terahertz impulse ranging system using asynchronous optical sampling. This technique precisely measures distances of stationary and moving objects, even with rough surfaces, for nondestructive inspection.

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Area of Science:

  • Terahertz (THz) technology
  • Non-destructive testing
  • Metrology

Background:

  • Terahertz (THz) radiation offers unique properties for material interaction.
  • Optical scattering limits traditional ranging methods for rough surfaces.
  • Accurate distance measurement is crucial for industrial inspection.

Purpose of the Study:

  • To develop a real-time terahertz impulse ranging (THz IPR) system.
  • To leverage asynchronous optical sampling (ASOPS) for enhanced measurement precision.
  • To demonstrate THz IPR for inspecting optically rough surfaces and moving targets.

Main Methods:

  • Combined time-of-flight measurement with pulsed THz radiation.
  • Utilized asynchronous optical sampling (ASOPS) for temporal magnification.
  • Applied the system to stationary and moving targets, including shape and thickness measurements.

Main Results:

  • Achieved high accuracy (-551 μm) and resolution (113 μm) for stationary targets.
  • Enabled real-time distance measurements of moving targets at 10 Hz.
  • Successfully demonstrated shape and paint film thickness measurements on optically rough surfaces.

Conclusions:

  • ASOPS THz IPR provides precise, real-time distance measurements for challenging surfaces.
  • The system shows significant potential for nondestructive inspection of large structures.
  • This technology expands the application scope of THz-based metrology.