Terahertz bistatic three-dimensional computational imaging of hidden objects through random media

Area of Science:

• Optics and Photonics
• Electromagnetism
• Imaging Science

Background:

• Random media significantly limit photoelectric detection and imaging capabilities.
• Existing imaging techniques through random media are confined to the laser wavelength range.
• The imaging potential of terahertz waves in such scenarios remains largely unexplored.

Purpose of the Study:

• To develop a novel approach for terahertz bistatic three-dimensional imaging (TBTCI) of hidden objects concealed by random media.
• To explore the application of terahertz waves for imaging beyond the limitations of laser-based methods.
• To demonstrate the feasibility of TBTCI through scattering environments.

Main Methods:

• Deduction of the field distribution within a bistatic terahertz time-domain spectroscopy system.
• Proposal of an explicit point spread function to characterize the effects of random media.
• Implementation of 3D imaging algorithms based on the derived system parameters.

Main Results:

• Successful three-dimensional imaging of objects hidden behind random media was achieved.
• The proposed TBTCI method effectively overcomes the scattering limitations of random media.
• The point spread function accurately models the wave propagation through the random medium.

Conclusions:

• The developed terahertz bistatic three-dimensional imaging approach provides a viable solution for imaging through random media.
• This technique opens new avenues for terahertz wave applications in challenging imaging environments.
• Potential applications include non-invasive testing and biological imaging, particularly in conjunction with millimeter-wave radar systems.