Terahertz wave imaging device

Abstract

The invention belongs to the technical field of terahertz wave imaging, and provides a terahertz wave imaging device. The device comprises a sample stage for supporting samples needing to be detected, a terahertz wave radiation source, a lens for focusing terahertz lights to a focal point, a first off axis paraboloidal mirror for transforming terahertz lights into parallel terahertz lights, a reflector for reflecting parallel terahertz lights, a second off axis paraboloidal mirror for focusing reflected parallel terahertz lights to a sample needing to be detected, a chopper for carrying out a chopping modulation process on terahertz lights, a detector for inducting energy changes of all detecting points of terahertz lights and then producing corresponding electrical signals of the detecting points, a signal processing unit for amplifying electrical signals of detecting points to carry out analogue-to-digital conversion processing to produce multiple resulting values, and a display terminus for carrying out imaging and display processes on samples needing to be detected through scanning and imaging software. The terahertz wave imaging device can realize a long-distance detection and is suitable especially for the situation that a suspicious object is carried out a safety inspection.

Description

technical field [0001] The invention belongs to the technical field of terahertz wave imaging, and in particular relates to a terahertz wave imaging device. Background technique [0002] Terahertz wave (THz wave) refers to electromagnetic waves with a frequency in the range of 0.1THz to 10THz (wavelength 30um-3mm), which is between microwave and infrared light, and is in the crossover region of electronics and photonics. Compared with traditional light sources, terahertz waves have many unique properties. For example, the photon energy of terahertz waves is low, and the loss when penetrating non-polar substances and dielectric materials is small. Many macromolecules have "fingerprints" in the terahertz wave band. Spectrum", so it can be applied in the field of safety inspection and quality monitoring technology. [0003] However, the terahertz wave imaging device provided by the prior art does not consider the distance requirement between the object to be detected and the i...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a terahertz wave imaging device, which aims to solve the problem that the terahertz wave imaging device provided by the prior art does not consider the distance requirements between the object to be detected and the inspector, cannot realize long-distance detection, and has a narrow application range The problem

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