Single-pixel terahertz holographic imaging device and method

Abstract

The invention discloses a single-pixel terahertz holographic imaging device and method. Monochromatic terahertz light emitted by a terahertz laser source is transformed into parallel light with larger beamwidth by a beam expander device, and then divided into object light and reference light through a beam splitter; the object light is encoded by a modulation device in airspace after irradiating an object; the reference light passes through an adjustable phase shifter on the light path after being reflected by a plane mirror; the object light is converged with the reference light on a second beam splitter after being reflected by the plane mirror, enters a single-pixel detector at the focus point of a condenser lens after being converged by the condenser lens; a signal output by the single-pixel detector is fed to a control module to carry out image reconstruction; and terahertz holographic compression sensing imaging of the object is achieved by changing combination of a space code on the modulation device and a phase on the adjustable phase shifter for a plurality of times. The single-pixel terahertz holographic imaging device and method have the advantages that real three-dimensional imaging of the tested object is achieved by combining phase-shifting digital holography with a compression sensing principle, and the single-pixel terahertz holographic imaging device and method are pioneering inventions in the field of terahertz imaging.

Description

[0001] Technical field [0002] The invention relates to a single-pixel terahertz holographic imaging device and method, belonging to the technical field of terahertz imaging. Background technique [0003] Terahertz radiation can penetrate a variety of insulating materials and is a kind of non-ionizing radiation, which can realize non-destructive and harmless detection of human body or objects. These advantages make terahertz imaging technology have many application requirements, such as security, security, chemicals Identification, medical imaging, quality control, etc. Most of the existing terahertz imaging technologies only have two-dimensional imaging capabilities. Through the analysis of photon flight time or tomography technology, terahertz imaging systems can also achieve the ability to form two-dimensional images on different sections of the system. However, in these imaging technologies, the collected signals often only contain item information on a few sections, and do n...

AI Technical Summary

Problems solved by technology

However, in the terahertz band, the cost of the detector array is high, and the detection performance of the array element is far below the level of a single detector. If a single-detector mechanical scanning method is used, fast imaging cannot be achieved. Therefore, the terahertz digital holography system does not The design method of visible light digital holography system cannot be directly adopted

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