Open-Space NQR Material Detection Using Intermediary Antenna
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Solution Overview
Problem
Existing material detection systems struggle to scan items 'in the open' without RF shielded containers, suffer from long scan times, and are susceptible to RF interference.
Innovation Solution
The system uses nuclear quadrupole resonance (NQR) spectrometry to transmit and receive RF signals through open space, employing a transmit chain and a receive chain with probes positioned above a table to detect materials like explosives and narcotics without the need for shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If items are scanned in the open without RF shielded containers, then ease of operation is improved, but reliability deteriorates due to RF interference
Solution Approach 1:
The patent introduces a dedicated receive antenna as an intermediary component that is optimally positioned and configured to selectively receive NQR signals from target materials while rejecting RF interference from the environment. This intermediary element mediates between the transmitted RF signals and the detected material signatures, enabling reliable detection in open environments without RF shielded containers.
2Measurement precision
If conventional scanning methods are used, then detection capability is achieved, but loss of time increases due to long scan times
Solution Approach 1:
The patent employs periodic pulsed RF transmission followed by timed signal reception windows to detect NQR signals from target materials. By using periodic action with optimized pulse durations and reception timing, the system achieves rapid detection within seconds while maintaining high detection capability through repeated measurement cycles that accumulate signal information.
3Reliability
If RF shielded containers are used, then reliability is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent extracts and removes the RF shielded container requirement from the detection system by using a receive antenna configuration that inherently rejects RF interference through directional sensitivity and frequency-selective reception. This extraction eliminates the need for complex shielding structures while maintaining reliable detection capability in open environments.
4Reliability
If RF shielded containers are used, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent introduces a dedicated receive antenna as an intermediary component that is optimally positioned and configured to selectively receive NQR signals from target materials while rejecting RF interference from the environment. This intermediary element mediates between the transmitted RF signals and the detected material signatures, enabling reliable detection in open environments without RF shielded containers.
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 enables rapid, non-contact, and unambiguous detection of target materials, reducing scan times to about one second and suppressing RF interference, allowing for safe and efficient scanning in various environments.
Implementation Method 1
processing the second RF signals to identify the one or more materials within the item using nuclear quadrupole resonance 'NQR' spectrometry
Implementation Method 2
receiving second RF signals from the item through open space, the second RF signals having one or more characteristics indicative of one or more materials within the item
Data Source
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AI summary
A system includes a table (418) and a material detection system (100). The material detection system includes a transmit chain (108) configured to generate first radio frequency (RF) signals and a transmit probe (120) configured to transmit the first RF signals towards an item through open space. The material detection system also includes a receive probe (122) configured to receive second RF signals from the item through open space, where the second RF signals have one or more characteristics indicative of one or more materials within the item. The material detection system further includes a receive chain (114) configured to process the second RF signals and at least one processing device (102, 202) configured to identify the one or more materials within the item using nuclear quadrupole resonance (NQR) spectrometry based on the processed second RF signals. The transmit and receive probes are positioned in an upper portion of the table.