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Microwave imaging device

A technology of microwave imaging and electromagnetic waves, which is applied in measuring devices, electromagnetic wave detection, radio wave measurement systems, etc., can solve the problems of inability to carry out large-scale commercial applications, low flexibility of equipment, low sampling efficiency, etc., and achieve easy production and business Application, high theoretical scanning speed, simple structure effect

Active Publication Date: 2021-07-23
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a microwave imaging device with simple structure and easy mass production for the problems of high hardware cost, low sampling efficiency, low equipment flexibility and inability to carry out large-scale commercial application in the prior art, which can be used in Minimizes hardware cost while retaining the highest sampling speed, i.e. ESC speed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this implementation, the test signal is set as a broadband signal with a center frequency of 60 GHz and a sampling rate of 5 MHz.

[0064] Such as figure 2 As shown, the number of basic transmission units in this embodiment is 400*400, arranged in a uniform grid, and the horizontal and vertical intervals are quarter wavelength Δx=1.2 mm. The emission source is located in the middle of the transmission screen, 250mm away from the transmission screen. The object to be measured is an ideal corner reflector (that is, an ideal reflection point), and the object is located at the same position on the other side, and the distance from the transmission screen z'=150mm. The electric control switch controls only one transmission unit to be in the passing state at the same time, and it is pushed backward in turn.

[0065] After the electromagnetic wave is emitted from the emission source, it passes through the basic transmission unit T 1,1 Arrives at the surface of the corne...

Embodiment 2

[0069] In this implementation, the test signal is set to a broadband signal with a center frequency of 72GHz, a bandwidth of 4GHz, and a linear change in frequency with a change rate of 63×10 12 Hz / s, sampling rate is 5MHz.

[0070] Such as image 3 As shown, the number of transmission units in this embodiment is 400*400, arranged in a uniform grid, and the horizontal and vertical intervals adopt the theoretical minimum value of quarter wavelength Δx=1 mm. The emission source is located in the middle of the transmission screen, 250mm away from the transmission screen. The object to be measured is a plane composed of multiple ideal corner reflectors (i.e., ideal reflection points), presenting the style of the letter C. The entire plane of the object to be measured is located at the same position on the other side, and the distance from the transmission screen z'=150mm. The electric control switch controls only one transmission unit to be in the passing state at the same time,...

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Abstract

The invention discloses a microwave imaging device which comprises an emission source, a guide cavity and a transmission screen. The emission source emits electromagnetic waves from the front end of the system and receives reflected electromagnetic waves; and the transmission screen is composed of transmission units, each transmission unit comprises a transmitting antenna, a receiving antenna, a switch and an isolation resistor, the transmitting antenna forms a transmission screen transmitting surface, the receiving antenna forms a transmission screen receiving surface, and the electric control switch is used for controlling the on-off state of the transmission units and determining that electromagnetic waves are radiated outwards or absorbed by the isolation resistor. The guide cavity is connected with the emission source and the transmission screen so that the emission source and the transmission screen are located in a closed space. According to the invention, the transmission screen is equivalent to the radar array, so that the hardware cost and the data collection difficulty are greatly reduced, an electric control scanning mode is reserved, and the extremely high scanning speed is ensured.

Description

technical field [0001] The invention relates to the technical field of space imaging, in particular to a microwave imaging device. Background technique [0002] The existing main security inspection methods are manual inspection, metal detection equipment and X-ray security inspection machine. There is a problem of low efficiency in the manual inspection method using metal detectors, and X-rays have a certain degree of damage to the human body due to the ionization characteristics. Millimeter wave security inspection technology has inherent advantages such as strong penetrating ability, low radiation to the human body and high resolution, and has become an important means of modern human security inspection. Millimeter wave imaging technology is a new and effective human body security inspection solution, and has broad application prospects and commercial value. [0003] Currently, active imaging and passive imaging technologies are mainly used for near-field millimeter-wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89G01S7/02G01V3/12
CPCG01S13/89G01S7/02G01V3/12
Inventor 邵文渊郭稼逸金秀华黄晓东
Owner NANJING UNIV OF POSTS & TELECOMM