A data selection-based terahertz compression imaging optimization method and system

Abstract

The invention relates to a data selection-based terahertz compression imaging optimization method and system. It includes: a terahertz emission source, a collimating lens, a mask plate, a converging lens and a terahertz detector, and the modulation matrix in the mask plate is a binary random matrix including [0,1]. The terahertz wave is emitted by the emission source, and after passing through the collimating lens, it becomes uniform parallel light and irradiates the mask and the imaging object to realize the amplitude modulation of the imaging object. The modulated transmitted light is focused to the focal point after the converging lens. The detector measures its intensity, and then the data is sorted and processed by an optimized selection algorithm, and the image is restored through the principle of compressed sensing. The present invention does not require expensive array terahertz detectors, and can obtain terahertz images through a small number of measurements. The imaging quality after data optimization and reorganization is better than that of traditional compressed sensing imaging methods, achieving better and more Fast terahertz compressed sensing imaging.

Description

technical field [0001] The invention relates to the field of terahertz imaging, in particular to a method and system for optimizing terahertz compression imaging based on data selection. Background technique [0002] Terahertz waves refer to electromagnetic wave radiation with a frequency in the 0.1-10THz frequency band. Due to its special position in the electromagnetic spectrum, terahertz waves endow it with a series of unique characteristics, and have been widely used in biomedical detection, material property detection, public safety and other fields. For example, terahertz photon energy is low, and its non-ionization characteristics will not damage the detection object, which can realize non-destructive testing; terahertz has penetrating ability to many non-metallic materials, and can be used as a way to detect concealed objects. With the maturity and application of terahertz imaging technology, the original point-by-point scanning imaging method has become a bottlenec...

AI Technical Summary

Problems solved by technology

However, the existing spatial light modulators are relatively expensive, and they all work in the visible light band; the latest silicon-based terahertz modulators are very complex in technology and require imaging objects to be etched on silicon wafers. limited

At the same time, due to the long wavelength of terahertz waves, when the imaging resolution is equal to the object size, diffraction and interference phenomena will inevitably occur in the imaging system, resulting in increased system noise, making it difficult to obtain images with high signal-to-noise ratio

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