Automated Dual-Mode Contraband Detection With Flexible Sampling
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Solution Overview
Problem
Existing X-ray CT systems have limitations in detecting contrabands below a certain threshold and face high false alarm rates due to interference substances, while manual sampling processes are labor-intensive and time-consuming, leading to security risks and passenger delays.
Innovation Solution
A fully automatic detection system comprising a first detection device for physical scanning and a second detection device for chemical scanning, utilizing flexible sampling mechanisms for particle and gas sampling, controlled by an induction device, with integrated trace detectors and a display for simultaneous results analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray CT systems are used for detection, then automatic identification of contrabands can be achieved, but detection is limited to contrabands above a certain quality threshold (hundreds of grams level)
Solution Approach 1:
The detection system is divided into two independent detection paths: a first detection device for physical scanning (X-ray CT) and a second detection device for chemical scanning (trace detection). This segmentation allows each device to specialize in different detection ranges, with the trace detection device handling small quantities of contraband below the CT detection threshold.
Solution Approach 2:
A conveying device acts as an intermediary to automatically transport objects between the first and second detection devices. This intermediary mechanism enables seamless integration of the two detection systems, allowing objects to undergo both physical and chemical scanning without manual intervention.
2Reliability
If CT systems are used to ensure detection probability, then contrabands can be identified, but false alarm rate increases to 10%-30% due to interference substances with similar density and effective atom number
Solution Approach 1:
The system merges physical detection (X-ray CT scanning) with chemical detection (trace detection) into a unified detection framework. By combining the results from both detection devices, the system can cross-validate findings and reduce false alarms caused by interference substances that may appear similar in physical properties but have different chemical compositions.
Solution Approach 2:
The system implements feedback mechanisms where detection results from the first detection device guide the operation of the second detection device. When the CT scan identifies suspicious objects, the trace detection device performs chemical analysis to confirm or refute the suspicion, creating a feedback loop that improves overall detection accuracy and reduces false alarms.
3Measurement precision
If manual sampling operations are used for trace detection, then sample collection can be performed, but the process is time-consuming and labor-intensive, requiring at least 1 minute per detection
Solution Approach 1:
The system implements self-service automation where the conveying device automatically transports objects through the detection tunnel and positions them for scanning. The trace detection device automatically collects samples from objects passing through, eliminating the need for manual sampling operations and reducing detection time from over 1 minute to a much faster automated process.
Solution Approach 2:
Manual mechanical sampling operations are replaced with an automated conveying and sampling system. The conveying device uses mechanical automation to transport objects, and the trace detection device uses automated mechanisms to collect samples, replacing the manual mechanical actions of operators with programmed mechanical systems that operate continuously at high speed.
4Measurement precision
If manual sampling with consumable swabs is used, then detection can be performed, but as passenger traffic increases, the amount of consumables increases and requires additional operator training
Solution Approach 1:
The automated trace detection device performs sampling operations autonomously without requiring human operators to manually handle consumable swabs. The system self-manages the sampling process, reducing operational complexity and eliminating the need for operator training on manual sampling techniques while maintaining detection accuracy.
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
Enhances detection accuracy and speed by providing simultaneous chemical and physical scanning results, reducing false alarms and operational complexity, and enabling high-speed, real-time detection of prohibited substances.
Implementation Method 1
a first detection device configured to perform a physical scanning on an object to be inspected
Implementation Method 2
an ion mobility spectrometer
Data Source
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AI summary
Provided are a fully automatic detection system (100) and a fully automatic detection method. The fully automatic detection system (100) includes: a first detection device (101) configured to perform a physical scanning on an object to be inspected; a second detection device (102) provided on an upstream or a downstream of the first detection device (101), and configured to perform a chemical detection on the object to be inspected; and a conveying device (103) configured to convey the object to be inspected to the first detection device (101) and the second detection device (102). The second detection device (102) includes a flexible sampling mechanism. The flexible sampling mechanism includes: a first flexible sampling mechanism configured to collect particle sample on the object to be inspected; and a second flexible sampling mechanism configured to collect gas sample on the object to be inspected. The fully automatic detection system features high detection accuracy, fast detection speed and simple operation, and the detection may be completed automatically.