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Two-dimensional oscillating mirror scanned terahertz passive imaging system

A terahertz imaging, two-dimensional swing mirror technology, applied in the field of terahertz imaging, can solve the problems of high cost and complex structure, and achieve the effect of simple structure, simple and compact structure, and convenient system imaging time

Inactive Publication Date: 2012-07-18
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] Aiming at the shortcomings of the current terahertz active imaging system that requires a local terahertz oscillating light source, complex structure, and high cost, the present invention proposes a passive two-dimensional swing mirror scanning terahertz imaging system, which uses a simpler scanning imaging system and a simple The three-dimensional translation stage realizes the adjustable object distance, imaging time and detector position of the system imaging, and realizes the passive terahertz imaging of the sample

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Embodiment Construction

[0026] The present invention is described in further detail below in conjunction with accompanying drawing:

[0027] attached figure 1 This is a schematic diagram of the system structure of this patent, and the system is composed as follows: condenser lens 1, off-axis parabolic mirror 2, two-dimensional scanning pendulum mirror 3, light-through aperture 3-1, plane mirror 4, terahertz imaging detector 5, Pre-signal amplifier 6, control system 7. The specific implementation process is as follows: the terahertz electromagnetic wave radiated by the imaging sample 1 is collected by the condenser lens 1 and the off-axis parabolic mirror 2, and the imaging sample is scanned by the imaging scanning system composed of the two-dimensional scanning pendulum mirror 3 and the plane mirror 4. Carry out two-dimensional progressive scanning back and forth, and then the terahertz electromagnetic wave is detected by the terahertz detector through the light hole 3-1, and then the amplified sign...

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Abstract

The invention discloses a two-dimensional oscillating mirror scanned terahertz passive imaging system. The system realizes terahertz waveband imaging of an imaging sample by scanning gradually point by point by using a two-dimensional oscillating mirror and can adjust scanning speed, imaging time and optimum object distance of system imaging. The imaging system has the characteristics of high imaging space resolution ratio, high signal to noise ratio, high temperature resolution ratio and the like. Compared with the active type transmission and reflection terahertz imaging system, the system has the advantages of simple and compact structure, needs no local terahertz oscillating source and area-array detector, and merely needs unit detector.

Description

technical field [0001] The invention relates to the field of terahertz imaging, in particular to a terahertz passive imaging system scanned by a two-dimensional swing mirror. Background technique [0002] The terahertz band is an electromagnetic band between microwave and millimeter waves and infrared rays, and its frequency range and wavelength range are 0.1THz-10THz and 3mm-30μm, respectively. Previously, there was little research on the terahertz band, which has been called THz Gap. In recent years, due to the continuous discovery of terahertz waves in materials, communications, biochemistry, safety detection, space remote sensing and other fields. The potential has greatly increased the research enthusiasm of researchers at home and abroad. In terms of terahertz technology, terahertz imaging technology is one of the most promising development directions in terahertz science and technology. Due to the small photon energy of terahertz waves, the strong absorption of the ...

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Application Information

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IPC IPC(8): G01N21/17G02B26/10
Inventor 黄志明童劲超侯云陆金星黄敬国张雷博周炜郁启华沈学民褚君浩
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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