Terahertz wave three-dimensional computed tomography based on injection-seeded terahertz wave parametric emitter and...

Area of Science:

• Physics
• Engineering
• Materials Science

Background:

• Terahertz (THz) wave technology offers unique capabilities for material characterization.
• Existing THz imaging systems often face limitations in dynamic range and resolution.
• Advanced computed tomography (CT) is crucial for non-destructive testing (NDT).

Purpose of the Study:

• To demonstrate a novel 3D THz computed tomography system with high dynamic range.
• To achieve high-resolution imaging of samples with significant THz absorption.
• To showcase the system's potential for industrial non-destructive testing and evaluation.

Main Methods:

• Utilized a frequency-tunable, high-power THz wave source via an injection-seeded parametric source.
• Implemented ultrasensitive THz wave detection using heterodyne detection.
• Developed a 3D computed tomography system covering the 0.95 to 2.7 THz frequency range.

Main Results:

• Achieved a maximum dynamic range exceeding nine orders of magnitude.
• Acquired high-resolution 3D tomographic images of various samples.
• Successfully imaged internal defects in a plastic product and a pencil.

Conclusions:

• The developed 3D THz CT system offers unprecedented dynamic range and resolution.
• The system is highly effective for imaging materials with strong THz absorption.
• Demonstrated significant potential for non-destructive testing and evaluation in industrial applications.