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Focal plane scanning-based passive terahertz imaging system

A terahertz imaging and focal plane technology, used in optics, optical device exploration, instruments, etc., can solve the problems of slow imaging speed, complex control process, large imaging equipment, etc., to achieve reduced length, high imaging frame rate, scanning fast effect

Inactive Publication Date: 2018-02-23
芜湖华创光电科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Terahertz imaging equipment used for short-distance security checks has a long optical path, which makes the imaging equipment bulky and inconvenient to use in some occasions; many imaging equipment use stepping motors to control mirrors to scan and scan. The control process is complex and the imaging speed is slow

Method used

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  • Focal plane scanning-based passive terahertz imaging system
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  • Focal plane scanning-based passive terahertz imaging system

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Embodiment example 1

[0033] It is used for imaging and detection of hidden objects 3m away from the human body, with a detection resolution of 3cm, a horizontal coverage of 0.6m, and a vertical coverage of 2m. The system works in the 3mm band with a center frequency of 90GHz and a bandwidth of 10GHz. Therefore, 20 feed antennas are needed in the horizontal direction to form a one-dimensional linear array, covering a width of 0.6m, and the scanning speed in the vertical direction is 10Hz, so the accumulation time of each pixel is:

[0034]

[0035] Where T is the scan period, and N is the number of pixels in the vertical direction. The noise figure of the receiving channel is 5dB, the equivalent noise temperature is 627K, and the antenna noise temperature is 300K, then the sensitivity of the system is:

[0036]

[0037] In the above formula, T sys is the system noise temperature, T a is the antenna temperature, T ris the receiver noise temperature, B is the RF bandwidth, and τ is the accu...

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Abstract

The invention discloses a focal plane scanning-based passive terahertz imaging system, which comprises an antenna sub-system, a receiving sub-system, a collecting and preprocessing sub-system, a servosub-system, a system power supply, and a display and control part. The antenna sub-system is connected with the receiving sub-system. The receiving sub-system is connected with the collecting and preprocessing sub-system. The collecting and preprocessing sub-system is respectively connected with the servo sub-system and the display and control part. According to the invention, a stationary reflector further reduces the length of an optical path in the vertical direction, and reduces the height of equipment by more than 10 cm. The stepping control for a scanning swing mirror of a scanning mechanism is not required, while the starting time and the stopping time of the scanning swing mirror are not needed. Therefore, the scanning speed is high, and the imaging frame rate is high. Meanwhile,the frame rate can reach 10 frames when near-distance human body hidden articles are detected.

Description

technical field [0001] The invention relates to the field of terahertz imaging detection of hidden human objects in the field of civil security, in particular to a passive terahertz imaging system based on focal plane scanning. Background technique [0002] The passive terahertz imaging technology used for the detection of hidden dangerous goods in the human body has a good market application prospect because it does not radiate any signal and is completely safe for the inspected personnel. [0003] In the passive terahertz imaging detection technology, the focal plane imaging technology is widely used. The focal plane imaging technology is to arrange multiple antenna feeds in a certain way to form a feed array, and place them on the focal plane of the lens antenna or reflector antenna to receive the terahertz signals generated by the objects and scenes in the field of view and form an image. Each feed of the focal plane feed array corresponds to the corresponding pixel uni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V8/10G02B26/10
CPCG01V8/10G02B26/105
Inventor 吴双
Owner 芜湖华创光电科技有限公司
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