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Short millimeter wave alternating current radiation imaging method and device

A radiation imaging and millimeter wave technology, applied in the field of radiometer imaging, can solve the problems of image DC energy loss, low imaging sensitivity, etc., and achieve the effects of good integration and consistency, short integration time, and moderate spatial resolution

Active Publication Date: 2014-02-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After using a high-speed scanning AC radiometer, the DC energy of the image will be partially lost, and the imaging sensitivity will be low

Method used

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  • Short millimeter wave alternating current radiation imaging method and device
  • Short millimeter wave alternating current radiation imaging method and device
  • Short millimeter wave alternating current radiation imaging method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Test experiment of millimeter wave radiation characteristics of contraband items:

[0045] Use PC and single-chip microcomputer for scanning control and imaging. During the imaging scanning process controlled by single-chip microcomputer, use the 3mm band antenna to receive the natural radiation information of human clothing (and hidden objects) within an interrupt period, and amplify it through the RF low-noise amplifier module. Then enter the detection module, and then generate a voltage signal through the gating function of the low-amplification module. This voltage signal becomes a digital signal after being sampled by A / D. The corresponding gray level is determined according to the amplitude of the voltage signal to generate a The original image, the original image is geometrically corrected (such as hiding the shape of the ring), and then subjected to DC energy compensation, such as a large area of ​​​​different colors in the image to represent the area,...

Embodiment 2

[0046] Example 2: Test experiment of millimeter wave radiation characteristics of the scene:

[0047] Use PC and single-chip microcomputer for scanning control and imaging. During the imaging scanning process controlled by single-chip microcomputer, use the 3mm band antenna to receive the natural radiation information of the scene (ground object) within an interrupt period, and amplify it through the RF low-noise amplifier module Enter the detection module, and then generate a voltage signal through the gating function of the low-level module. This voltage signal becomes a digital signal after being sampled by A / D. The corresponding gray level is determined according to the amplitude of the voltage signal to generate an original Image, the original image is geometrically corrected (such as rectangular and circular targets), and then subjected to DC energy compensation, such as a large area of ​​different colors in the image to represent the region, and finally use the Matlab sy...

Embodiment 3

[0050] Embodiment 3: as image 3 As shown, the main dimensions and technical parameters of the millimeter-wave radiation imaging device in the AC energy system are as follows: height 1.8m, weight less than 50kg, floor area 0.2m 2 ;The imaging range is 180oX90o (horizontal rotation can be extended to 360o according to actual needs), except for the power base and SMA signal base, the whole system has no open lines, and all imaging function modules are located in the integrated structure. The system design and connection structure are as follows: the vertical stepper motor 1 that controls the vertical direction and its counterweight metal block 2 are located on the left and right sides of the horizontal rotating frame 5, and the Kaseg that is compatible with the caliber within 600mm is placed on the vertical rotating frame 16 The antenna 3 and the radiometer 4, the signal line and power line of the radiometer 4 and the phase line of the stepping motor pass through the inner wall ...

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Abstract

The invention discloses a short millimeter wave alternating current radiation imaging method and device. The short millimeter wave alternating current radiation imaging method includes the steps of enabling an antenna to receive information, amplifying the signal radio frequency of the information, conducting signal detection, low-frequency signal amplification and gating, A / D sampling, voltage-gray level imaging, image geometric correction and image energy compensation, displaying a pseudo-color image, and the like. The short millimeter wave alternating current radiation imaging device comprises an antenna module, a radio frequency low-noise amplifier module, a detection module, a gating low-noise amplifier module, an A / D sampling module, a scanning control module, an alternating current imaging module, a geometric correction module, an energy compensation module and an image display module. The short millimeter wave alternating current radiation imaging method and device are simple in structure, low in use cost and good in use effect.

Description

technical field [0001] The invention belongs to the field of radiometer imaging, in particular to a short millimeter wave AC radiation imaging method and an imaging device. Background technique [0002] Compared with the imaging detection of various existing active and passive systems, the main difficulty of millimeter wave and submillimeter wave passive imaging is that the energy of millimeter wave and submillimeter wave radiated by various objects in nature is too weak, usually only pico The watt level is even lower, and various interferences in nature and the noise of the receiver itself are much higher than the energy of the useful signal. Therefore, how to detect useful information from signals submerged by noise is a big challenge. Since the natural intrinsic radiation of natural objects cannot be changed, the fundamental method is to improve the sensitivity of the receiver, such as performing pre-low noise amplification on the signal as much as possible, minimizing t...

Claims

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Application Information

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IPC IPC(8): G01S13/89
CPCG01V8/005
Inventor 张光锋娄国伟李跃华李兴国朱莉王虹王琪
Owner NANJING UNIV OF SCI & TECH
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