Abstract
In terahertz imaging systems based on Gaussian beam active illumination and focal plane array detectors, severe image distortion has been observed, which significantly reduces the resolving power of the imaging system. To solve this problem, a novel computational method, Light Field Imaging (LFI), has been introduced for terahertz imaging. A conventional transmission-type terahertz imaging system based on a gas-pumped terahertz source and terahertz Focal Plane Array Detectors (FPA) arrays is established to analyze the problem of image distortion. An experimental virtual camera array terahertz LFI system is also established. With the acquisition and reconstruction of synthetic aperture terahertz light fields, the improvement on resolving power and SNR performance have been validated.
Highlights
Terahertz imaging is a novel imaging method with promising application fields
To ensure an acceptable signal-to-noise ratio (SNR) and resolve the power for samples with a certain thickness, most terahertz imaging applications rely on a high-power, collimated source for illumination [3]
Withimproved the resultby of using the conventional method, the performance and resolving power areCompared significantly the synthetic aperture performance resolving power are significantly improved by using the synthetic aperture method, 2020, and9,and the 830 unrecognizable patterns as a result of the conventional method become 8fully of 11 method, and the unrecognizable patterns as a result of the conventional method become fully recognizable with the synthetic aperture method
Summary
Terahertz imaging is a novel imaging method with promising application fields. Terahertz waves are electromagnetic waves with a wavelength between 30 and 3000 μm or a frequency between. The LFI technique is utilized in multiple applications including dynamic refocusing [24], DoF extension [27], all-in-focus reconstruction [28], depth estimation [29,30], 3D reconstruction [31], super-resolution reconstruction [32,33], synthetic aperture imaging and high-speed photography [27]. The effects caused by the coherence of light sources and the aperture of the imaging system are not further discussed, which are important factors for practical imaging systems and objects. With the experiments of transmission-type imaging configuration, the effectiveness of the LFI method in removing the image distortion and improving the resolving power compared with a conventional setup is validated
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