3D terahertz point cloud imaging at 100 GHz frequency in active reflection mode based on the disparity method

Document Type : Original Article

Authors

1 Master's degree, Imam Hossein University (AS), Tehran, Iran

2 Researcher, Imam Hossein University, Tehran, Iran

Abstract

This article presents terahertz imaging at a frequency of 100 GHz in reflective mode, at a distance of 4 m, and under different angles from the target. The terahertz signal source is an Impatt diode that produces a signal at a frequency of 100 GHz. One of the challenges in terahertz imaging is to obtain a three-dimensional geometry or volume image of the target under the terahertz signal radiation so that more information can be obtained from the target, especially when the target is embedded in a way that cannot be understood under an angle. From that, the importance of this issue is doubled, especially at the entrance of security places or military sites, when it is used to inspect people or equipment. The proposed imaging method irradiates the terahertz signal to the target through a lens. The target is placed on a rotating tripod and starts rotating for unequal steps. The return signal from the target under different angles within the field of view of the optical system is focused by a Cassegrain parabolic reflector and forms a two-dimensional image on a 32x32 pixel array camera. The camera captures a set of 2D terahertz images with transformed intensity patterns from the target at different angles. By using the semi-global matching algorithm, two images from the set of recorded images are compared pixel by pixel, and a 3D point cloud is retrieved from the target.

Keywords

References

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Radar
Volume 11, Issue 2
Autumn and Winter
January 2024
Pages 101-112

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History

  • Receive Date: 15 August 2023
  • Revise Date: 19 November 2023
  • Accept Date: 11 December 2023
  • Publish Date: 22 December 2023

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