Terahertz Image Collection via Swinging Reflection Plate
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Solution Overview
Problem
The existing terahertz signal-based image collection systems face issues with mutual imaging between two terahertz devices, leading to low contrast in the images formed, as the terahertz wave signals reflected by one device can incident on the other, causing interference.
Innovation Solution
The method involves adjusting the posture of the swinging reflection plate of each terahertz device to prevent terahertz wave signals from being incident on the other device. This is achieved by rotating the swinging reflection plates around parallel rotation shafts and controlling the phase difference between them to be outside a specific threshold range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two terahertz devices are arranged at front and rear positions to simultaneously image both sides of pedestrians, then inspection efficiency is improved, but mutual imaging occurs causing low image contrast
Solution Approach 1:
The patent applies the dynamics principle by making the reflection plates movable rather than fixed. Each terahertz device is equipped with a reflection plate that can dynamically adjust its posture through rotation around a rotation shaft. This dynamic adjustment allows the system to change the reflection direction in real-time, preventing mutually reflected terahertz waves from entering the receiving antenna, thereby solving the mutual imaging problem while maintaining high inspection efficiency
Solution Approach 2:
The patent implements parameter changes by controlling the phase difference between the two reflection plates. By adjusting the rotation angle of each reflection plate and maintaining a phase difference outside a specific threshold range, the system changes the spatial parameters of wave reflection. This parameter control ensures that reflected waves from one device do not incident on the other device's reflection plate, thus preventing mutual imaging and maintaining high image contrast
2Manufacturing precision
If the phase difference between swinging reflection plates is controlled to prevent mutual imaging, then image contrast is improved, but device complexity increases due to phase control mechanisms
Solution Approach 1:
The patent applies mechanics substitution by replacing complex electronic phase control mechanisms with a simpler mechanical rotation system. Instead of using electronic phase shifters or complex control circuits to manage the phase difference, the system uses mechanically rotated reflection plates. The rotation shaft and reflection plate structure provide a straightforward mechanical means to control wave reflection direction, reducing device complexity while achieving the same goal of preventing mutual imaging and maintaining high image contrast
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents mutual imaging between the terahertz devices, enhancing the contrast of the images formed by ensuring that the terahertz wave signals are not affected by each other's reflection plates.
Implementation Method 1
adjusting a posture of a swinging reflection plate of each terahertz device to reflect terahertz wave signals emitted by a target to be inspected
Data Source
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AI summary
The present disclosure discloses a terahertz signal-based image collection method and system. The image collection method includes: providing two terahertz devices respectively on two sides of an inspection region; adjusting a posture of a swinging reflection plate of each terahertz device to reflect terahertz wave signals emitted by a target to be inspected in the inspection region, and preventing the terahertz wave signals of the target to be inspected reflected by the swinging reflection plate of one of the two terahertz devices from being incident on the swinging reflection plate of the other one of the two terahertz devices; and generating terahertz images of different sides of the target to be inspected based on terahertz signals reflected from the swinging reflection plates of the two terahertz devices.