Embedded RFID Bolt Carrier for Reliable Firearm Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing RFID systems for detecting firearms in secure areas face limitations such as removable and interchangeable RFID tags, limited detection range due to radio frequency exposure regulations, and poor performance on metal surfaces.
Innovation Solution
A system using RFID tags embedded within the bolt carrier of firearms, coupled in a tamper-resistant manner, and utilizing microwave frequencies with a half wavelength antenna aperture to achieve enhanced detection range. Multiple RFID interrogators are used to sequentially transmit interrogating signals, minimizing RF exposure and improving detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If RFID tags are affixed to removable components such as the grip, then the detection system can be easily installed, but the tags become easily removable and interchangeable, allowing for detection nullification
Solution Approach 1:
The RFID tag is extracted from removable components and embedded directly into the bolt carrier, a critical internal component that cannot be easily removed or replaced. This extraction from vulnerable locations to a protected location ensures the tag remains securely attached to the firearm throughout its operational life.
Solution Approach 2:
The RFID tag is nested within the bolt carrier assembly, specifically embedded in the carrier body. This nesting approach places the tag inside the firearm's internal structure, making it inaccessible for removal or replacement while maintaining the firearm's functionality.
2Device complexity
If a single RFID interrogator is used, then the device complexity is low, but the detection range is limited due to radio frequency exposure regulations
Solution Approach 1:
The detection system is segmented into multiple interrogators positioned at different locations around the secure area. Each interrogator covers a specific zone, and collectively they provide comprehensive coverage of the entire area, overcoming the limited range of individual interrogators.
Solution Approach 2:
Multiple interrogators transmit interrogating signals in a sequential, periodic manner rather than simultaneously. This staggered transmission approach allows each interrogator to operate within regulatory RF exposure limits while collectively achieving extended detection range through coordinated coverage.
3Ease of manufacture
If RFID tags are mounted on metal surfaces, then the installation is straightforward, but the performance degrades significantly due to interference with electromagnetic fields
Solution Approach 1:
A non-conductive carrier component is introduced as an intermediary between the RFID tag and the metal bolt carrier. This intermediary material (such as plastic or polymer) electrically isolates the tag's antenna from the conductive metal surface, preventing electromagnetic interference while allowing the tag to be securely mounted in the metal component.
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 system achieves a 10-fold improvement in detection range compared to prior art on-metal applications, ensuring reliable detection of firearms even when mounted on metal surfaces, while adhering to RF exposure regulations.
Implementation Method 1
The tag receives energy via electromagnetic waves propagated from the reader/antenna. Once the wave reaches the tag, the energy travels through the tag's internal antenna, and activates the chip.
Implementation Method 2
The energy is modulated with the chip's data, which contains identifying information that is unique to the chip/tagged object and flows back via the tag's antenna to the reader's antenna in the form of electromagnetic waves.
Data Source
AI summary
A system and method for detecting the presence of firearms and metal articles adapted with embedded RFID tags is disclosed. A plurality of RFID interrogators sequentially and intermittently transmit short burst interrogating signals thereby causing RFID tags within range to transmit a responsive signal which may be used to activate alarms and other security measures. RFID tags are configured using an ASIC chip enabled for 10 Ghz wireless communication. The ASIC chip is embedded within a bolt carrier that includes a slotted antenna aperture resulting in extended range wireless communication. A plurality of RFID interrogators are installed in an detection area and transmit a radio frequency signals which excite any RFID enabled devices within range causing the devices to generate and transmit a response signal which may be used to trigger a variety of security measures such as sounding an alarm, locking doors, contacting law enforcement, etc.