Wireless Security Tether for Portable Article Monitoring
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Solution Overview
Problem
Existing security systems for portable articles using wireless sensors are vulnerable to theft as the sensors can be easily separated from the articles without detection, and there is a need for improved security and assistance solutions that provide reliable tracking and alert mechanisms.
Innovation Solution
A wireless assistance system comprising a central alarm unit (CAU) and wireless sensors with a tamper detection circuit, which uses a tether to secure the sensor to the article and generates alert signals if the sensor is moved out of a defined zone or loses communication, and includes a help module for requesting assistance via SMS messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless sensors are placed loosely within a purse or monitored article, then the sensor can be easily installed and removed, but the sensor can be separated from the article without detection enabling theft
Solution Approach 1:
The security system is divided into separate functional components: a wireless sensor unit and a tether assembly. The tether is configured to engage with the sensor and extend around the portable article, creating a segmented attachment system that maintains sensor security while allowing for controlled installation and removal operations.
Solution Approach 2:
The tether serves as an intermediary element between the wireless sensor and the portable article. It provides a mechanical connection that prevents sensor separation while allowing the sensor to remain accessible for installation and removal operations, thus mediating between security requirements and operational flexibility.
2Strength
If mechanical connections or adhesives are used to secure the sensor, then the sensor attachment strength is improved, but the connection can be defeated to separate the sensor without detection
Solution Approach 1:
The tether is pre-configured with specific engagement features and routing paths that are established before the sensor is attached to the article. The tether extends around the article in a predetermined manner, creating a security mechanism that is already in place to prevent separation, rather than relying on post-attachment mechanical or adhesive bonds that could be defeated.
3Reliability
If the sensor continuously monitors the article location, then real-time security monitoring is achieved, but the system complexity and energy consumption increase
Solution Approach 1:
Instead of continuous monitoring, the wireless sensor operates in periodic cycles, transmitting location and status information at predetermined intervals. This periodic operation maintains real-time security awareness while significantly reducing system complexity and energy consumption compared to continuous operation, as the sensor and CAU only actively communicate when data transmission is required.
4Reliability
If the system uses multiple sensors and monitoring zones, then the security coverage is improved, but the device complexity and cost increase
Solution Approach 1:
The tether assembly serves multiple functions simultaneously: it secures the wireless sensor to the portable article, defines the monitored area boundaries, provides the mechanical connection for tamper detection, and acts as the structural element for zone definition. This multi-functionality reduces the need for separate components and multiple sensors, thereby improving security coverage without proportionally increasing device complexity.
Data Source
AI summary
A wireless system for monitoring portable articles includes a central alarm unit (CAU) comprising a programmed controller operatively associated with a CAU wireless communication circuit. At least one wireless sensor comprises a programmed controller operatively associated with a sensor wireless communication circuit for communicating with the CAU wireless communication circuit. The CAU is programmed to periodically determine distance between the wireless sensor and the CAU and operates in a programming mode and responsive to manual input commands to determine a normal distance of the article being monitored from the CAU. The CAU is programmed to define a first zone as the normal distance plus a first select amount and a second zone as the normal distance plus a second select amount, greater than the first select amount.