Detection Gate Airflow Design for Substance Signal Strength
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Solution Overview
Problem
Existing detection gates for substances like drugs and explosives have limitations in detection efficiency due to the isolated emission of air jets, which can lead to insufficient signal detection, allowing individuals carrying substances to evade detection.
Innovation Solution
A detection gate design featuring blowing and exhaust means that create a continuous air flow through a passage, allowing the same volume of air to pass twice, enhancing the capture and detection of substances by a downstream detection device, along with a transfer pipe and optional sterilization and holding mechanisms to optimize detection and prevent exit until the process is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If isolated air jets are emitted by nozzles to detach and entrain particles, then particles can be pulled away and conducted to detector, but detection signal may be insufficient and individuals may defeat the detection gate
Solution Approach 1:
The patent implements continuous air circulation through blowing means and exhaust means that create a sustained air flow through the passage, replacing isolated air jet emission. The air flow circulates continuously, passing through the passage multiple times to repeatedly interact with particles on individuals, thereby maintaining persistent detection capability and preventing evasion.
Solution Approach 2:
The patent employs detection means that monitor the air flow in real-time and provide feedback to control the blowing and exhaust means. When particles are detected or to optimize detection, the system adjusts air flow parameters dynamically, creating a closed-loop control system that enhances detection reliability and signal strength adaptively.
2Speed
If air flow speed is increased to improve particle entrainment, then particles are moved faster to detector, but detection time window decreases and detection efficiency may drop
Solution Approach 1:
The patent employs periodic modulation of air flow velocity through controlled cycles of blowing and exhaust phases. The air flow alternates between higher speed phases for particle entrainment and lower speed phases for detection, creating periodic action that optimizes both particle transport and detection efficiency across multiple cycles.
Solution Approach 2:
The patent applies preliminary air flow acceleration before the detection zone to entrain particles onto individual clothing surfaces, then reduces speed in the detection zone to allow adequate interaction time. This staged approach separates particle acquisition from particle detection, optimizing both processes without compromising overall efficiency.
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
The continuous air flow doubles the concentration of detectable molecules, improving detection efficiency and allowing for real-time analysis without stopping individuals, while the sterilization and holding mechanisms ensure thoroughness and safety.
Implementation Method 1
blowing means installed in a blowing chamber that one of the uprights has, and which are adapted to blow the air contained in the said blowing chamber towards the other upright
Implementation Method 2
exhaust means installed in an exhaust chamber that the other upright has, and which are able to suck in the air thus blown
Implementation Method 3
the blowing means and the exhaust means being such that the same volume of air has the time to travel across the passage at least twice
Implementation Method 4
a detection device disposed downstream from the passage and able to detect the presence of the said substances in the air thus blown
Data Source
AI summary
A detection gate for detecting substances carried by an individual or an object, has two lateral uprights facing one another and defining a passage there between for the individual or the object, a blowing device installed in a blowing chamber in one of the uprights which are adapted to exhaust the air contained in the blowing chamber towards the other upright, an exhaust device installed in an exhaust chamber in the other upright, which are suitable for exhausting the air thus blown, a detection device arranged upstream from the passage and adapted to detect the presence of the substances in the air thus blown, and a transfer line which, via one of the ends thereof, leads into the blowing chamber and, via the other end thereof, into the exhaust chamber, the blowing device and the exhaust device being such that a single volume of air has time to pass through the passage at least twice during the time that individual or the object is present in the passage.