Terahertz compression imaging optimization method and system based on data selection

Abstract

The invention relates to a terahertz compression imaging optimization method and system based on data selection. The terahertz imaging optimization device comprises a terahertz emission source, a collimating lens, a mask plate, a converging lens and a terahertz detector, wherein a modulation matrix in the mask plate is a binary random matrix containing [0, 1], terahertz waves are emitted by the emission source, the light is converted into uniform parallel light after passing through the collimating lens, the uniform parallel light is irradiated to the mask plate and an imaging object, amplitude modulation of the imaging object is achieved, the modulated transmission light is focused to a focus after passing through the converging lens, the intensity of the modulated transmission light is measured through a terahertz detector, then data is processed through sorting and optimization selection algorithms, and image restoration is conducted through the compressed sensing principle. The device is advantaged in that an expensive array type terahertz detector is not needed, the terahertz image can be obtained through a small number of measurement times, the imaging quality processed through the data optimization and recombination method is superior to that of a traditional compressed sensing imaging method, and better and faster terahertz compressed sensing imaging is achieved.

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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