Terahertz Camera Dual-Signal Imaging for Concealed Articles and Contours
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Solution Overview
Problem
Existing camera systems using terahertz waves struggle to detect both concealed articles and the features of inspection targets like human bodies or clothes due to specular reflection, making it difficult to acquire information about concealed articles.
Innovation Solution
The camera system radiates terahertz waves, acquires a first signal during emission and a second signal during non-emission, calculates the difference between these signals, and generates separate images from each, allowing simultaneous detection of concealed articles and features of inspection targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terahertz waves are used for inspection, then concealed articles can be detected, but features of contours of inspection targets cannot be acquired due to specular reflection
Solution Approach 1:
The patent segments the imaging process into two distinct modes: a first image obtained when terahertz waves are radiated (showing concealed articles) and a second image obtained when terahertz waves are not radiated (showing contour features). This segmentation allows each image to capture different types of information that would otherwise be mutually exclusive in a single image
Solution Approach 2:
The patent employs periodic action by alternately radiating and not radiating terahertz waves to capture two different images. The radiation unit periodically switches between radiating terahertz waves and not radiating them, allowing the detection unit to acquire signals under different conditions. This periodic switching enables the system to obtain both concealed article information and contour feature information through time-division multiplexing
2Reliability
If terahertz waves are radiated continuously, then concealed articles are detected, but contour features of inspection targets are lost
Solution Approach 1:
The radiation unit periodically switches between radiating and not radiating terahertz waves, creating two distinct imaging modes. This periodic action allows the system to maintain high detection reliability during radiation phases while preserving contour imaging capability during non-radiation phases, making the overall system both reliable and easy to operate
Solution Approach 2:
The patent introduces dynamics by making the radiation state changeable - the radiation unit can dynamically switch between radiating and not radiating terahertz waves. This dynamic control allows the system to adapt between different imaging needs, maintaining both detection reliability and imaging quality without being locked into a single static mode
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 enhances the detection of concealed articles while preserving the ability to capture the features of inspection targets, improving the overall imaging capability of the system.
Implementation Method 1
a radiation unit that radiates terahertz waves is disposed to face a camera unit that detects the terahertz waves
Implementation Method 2
the terahertz waves are subject to specular reflection without being scattered on the surface of the subject
Data Source
AI summary
A camera system capable of simultaneously acquiring a feature of a subject while detecting a concealed article radiates terahertz waves, acquires a first signal at a timing at which the terahertz waves are radiated and acquires a second signal different from the first signal at a timing at which the terahertz waves are not radiated, acquires a difference between the first and second signals, and generates a first image from the difference between the first and second signals and generates a second image different from the first image from the second signal.