Dual-pixel-based device for improving compressed sensing imaging quality of terahertz waves

Abstract

The invention discloses a dual-pixel-based device for improving compressed sensing imaging quality of terahertz waves. The device comprises a mask plate capable of achieving transmission and reflection at the same time, and the type of a first terahertz wave detector and the type of a second terahertz wave detector are identical. The terahertz waves carrying imaging object information are modulated through the mask plate, and the mask plate and an imaging object are placed in a light path in parallel; the first terahertz wave detector and the second terahertz wave detector receive terahertz wave radiation transmitted and reflected by the mask plate; radiation intensity arrays received by the first terahertz wave detector and the second terahertz wave detector are correspondingly added and processed, and normalized transmission and reflection radiation intensity arrays are obtained; the normalized transmission and reflection radiation intensity arrays are correspondingly subtracted and processed, and test data for restraining output fluctuation and external disturbance is obtained; a reconstructed image can be obtained by inputting the test data in a compressed sensing recovery program. The influences of external conditions are reduced to the maximum degree at the sampling stage of terahertz wave compressed sensing imaging, and imaging quality is improved.

Description

technical field [0001] The invention relates to the field of terahertz wave detection, in particular to a dual-pixel-based device for improving the imaging quality of terahertz wave compression sensing. Background technique [0002] Terahertz (Terahertz, referred to as THz, 1THz = 10 12 Hz) radiation refers to the frequency range from 0.1THz to 10THz, the corresponding wavelength is from 3 mm to 30 microns, and the electromagnetic spectrum range is quite wide between millimeter wave and infrared light. The special position of terahertz radiation in the electromagnetic spectrum endows it with a series of special properties, which makes terahertz technology applicable to biomedical detection, material property research, security inspection and other directions. Terahertz wave-related technologies have developed rapidly in the past two decades, and terahertz wave imaging, as one of its research hotspots, has achieved a series of results. With the continuous maturity of terahe...

AI Technical Summary

Problems solved by technology

There is a shortage of homogenizing devices in the terahertz band. Although the beam expansion will lead to relatively uniform radiation distribution, it still cannot meet the requirements of radiation homogenization.

If imaging with unevenly distributed terahertz radiation, it is equivalent to adding a radiation distribution matrix to the imaging object, and the Gaussian distribution is not easy to be sparse, so the imaging result will not be a simple superposition of the imaging object and the radiation distribution, but There will be reconstruction errors or even errors

[0005] In addition, the stability of the current terahertz radiation source needs to be further improved, and it is difficult to meet the requirements of long-term measurement, while the fluctuation of the terahertz radiation source and the temperature drift of the terahertz thermal radiation detector affected by the external environment will cause The possibility of causing an error in the imaging result increases sharply or directly produces a large error

[0006] At present, the method of restoring the original signal from the incomplete or noise-contaminated sampling signal by improving the restoration algorithm has also achieved certain results. However, this approach can only restore the original signal with a certain probability when the interference is small enough Signal

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