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Passive millimeter wave three-dimensional imaging system and imaging method thereof

A three-dimensional imaging and millimeter wave technology, applied in the field of three-dimensional imaging, can solve the problems of poor ability to detect bullying objects on the surface, small imaging depth of field, and reduced resolution, and achieve the effect of fast and convenient security inspection imaging

Pending Publication Date: 2021-12-10
HARBIN INST OF TECH
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Problems solved by technology

Therefore, the traditional focal plane array passive millimeter-wave imaging system with a fixed focal depth has the problem of a small imaging depth of field, which leads to a decrease in the resolution of the imaging system when scanning rotating or moving targets, especially when moving axially, and the detection of surface bullying Object ability is poor

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  • Passive millimeter wave three-dimensional imaging system and imaging method thereof
  • Passive millimeter wave three-dimensional imaging system and imaging method thereof
  • Passive millimeter wave three-dimensional imaging system and imaging method thereof

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[0044] according to Figure 2 to Figure 7 As shown, the specific optimization technical scheme that the present invention takes to solve the above-mentioned technical problems is: the three-dimensional structure diagram of the system is as follows Figure 4. The millimeter-wave three-dimensional radiation field measurement system includes a main dielectric lens 1, a sub-dielectric lens array 2, a radiometer receiver array 3, a digital acquisition circuit 4 and a computer 5. Electromagnetic waves radiated by objects in the system’s field of view converge to the plane of the sub-lens array 2 through the main dielectric lens 1, and then focus to the plane of the radiometer receiver array 3 through different sub-lenses. The receiving antenna 3-1 on the radiometer receiver receives the electromagnetic waves , output the signal to the millimeter wave band low noise amplifier 3-2 in sequence, the high sensitivity square law detector 3-3, the low pass filter 3-4, the low frequency am...

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Abstract

The invention relates to a passive millimeter wave three-dimensional imaging system and an imaging method thereof. The system comprises a main dielectric lens, a sub dielectric lens array, a radiometer receiver array, a digital acquisition circuit and a computer; electromagnetic waves radiated by an object in a field are converged to a sub-lens array plane through the main dielectric lens and then are focused to a radiometer receiver array plane through different sub-lenses, a receiving antenna on a radiometer receiver array receives the electromagnetic waves, signals are sequentially output to a millimeter wave band low noise amplifier, a high-sensitivity square law detector, a low-pass filter, and alow-frequency amplifier; and the output end of the low-frequency amplifier is connected with the input end of the digital acquisition circuit, and the digital acquisition circuit transmits sampling signals to the computer for data processing.

Description

technical field [0001] The invention relates to the technical field of three-dimensional imaging, and relates to a passive millimeter-wave three-dimensional imaging system and an imaging method thereof. Background technique [0002] Millimeter wave is an electromagnetic wave with a frequency range from 30GHz to 300GHz. The millimeter wave band covers multiple atmospheric windows (35GHz, 94GHz, 140GHz, 220GHz, etc.), can penetrate clouds, fog, smoke, and radiation measurements are not affected by weather and the environment; therefore, Millimeter wave radiation field measurement technology has important applications in military defense, remote sensing detection and other fields. In addition, due to the good penetration characteristics of millimeter waves to clothing, millimeter wave radiation field detection also has important applications in the field of human body security imaging for detecting concealed dangerous goods. In the millimeter wave band, especially the W wave b...

Claims

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 王鹏程王楠楠邱景辉马翰驰
Owner HARBIN INST OF TECH
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