Abstract
In this paper, we propose a phaseless terahertz coded-aperture imaging (PTCAI) method by using a single incoherent detector or an incoherent detection array. We at first analyze and model the system architecture, derive the matrix imaging equation, and then study the phase retrieval techniques to reconstruct the original target with high resolution. Numerical experiments are performed and the results show that the proposed method can significantly reduce the system complexity in the receiving process while maintaining high resolution imaging capability. Furthermore, the approach of using incoherent detection array instead of single detector is capable of decreasing the encoding and sampling times, and therefore helps to improve the imaging frame rate. In our future research, the method proposed in this paper will be experimentally tested and validated, and high-speed PTCAI at nearly real-time frame rates will be the main work.
Highlights
Terahertz imaging technologies have attracted increasing attention in areas such as security checks, terminal guidance, and battlefield reconnaissance [1]
We propose a phaseless terahertz coded-aperture imaging (PTCAI) method based on incoherent detection techniques
We propose a PTCAI method that can achieve high resolution, high frame rate and is forward looking based on detecting the intensity information incoherently
Summary
Terahertz imaging technologies have attracted increasing attention in areas such as security checks, terminal guidance, and battlefield reconnaissance [1]. For a traditional coherent detection TCAI system, high frequency and large bandwidth are beneficial to high-resolution imaging in azimuth and range dimensions. We propose a phaseless terahertz coded-aperture imaging (PTCAI) method based on incoherent detection techniques. The proposed method utilizes a single incoherent detector [17] or an incoherent detection array [18] to record directly the intensity responses of the echo signal, and it does not require any down-conversion or bandwidth reducing components. The TCAI method with a single detector requires large amount of sampling and encoding times to obtain enough information for reconstructing the target.
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