Portable Alarm System with Wireless ID Verification
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Solution Overview
Problem
Existing theft prevention technologies fail to quickly and reliably alert the victim of attempted theft, often triggering alarms accidentally or not detecting unauthorized touches effectively.
Innovation Solution
A portable alarm system comprising a touch-sensitive sensor device, an enquiry device, and a control system that emits an enquiry signal, compares it with a predefined identification signal, and triggers an alarm if the touch is unauthorized, using wireless communication between a portable identification device and the alarm device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a touch-sensitive sensor triggers an alarm immediately upon detecting a touch, then the response speed to theft is improved, but false alarms increase due to accidental touches
Solution Approach 1:
The system performs preliminary identification verification before triggering the alarm. When a touch is detected, the enquiry device first sends an enquiry signal to check for a valid identification signal from the identification device. Only if no valid identification is confirmed within a predetermined time does the control system trigger the alarm. This preliminary check prevents false alarms from accidental touches while maintaining fast response to actual theft.
2Ease of operation
If the alarm system uses wireless communication between portable devices, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The identification device serves multiple functions: it contains identification data for authentication, acts as a wireless communication device (RFID tag or similar), and functions as a proximity indicator. The alarm device also performs multiple roles: touch sensing, wireless enquiry, control logic, and alarm signaling. This multi-functionality reduces the need for separate components and simplifies the overall system despite the wireless complexity.
3Reliability
If the enquiry signal waits for a predetermined period before triggering alarm, then the reliability of theft detection is improved, but the response time increases
Solution Approach 1:
The system uses a predetermined time parameter that is optimized to balance reliability and response time. This time parameter is set long enough to allow legitimate identification devices (worn by the owner) to respond, but short enough to trigger an alarm quickly when no identification is received (indicating theft). The touch-sensitive sensor also provides immediate detection, with the enquiry signal sent promptly after touch, minimizing overall delay while maintaining reliability through the time-based verification window.
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 effectively recognizes and differentiates between authorized and unauthorized touches, immediately alerting the victim and preventing silent theft by emitting an alarm signal, even if the thief uses gloves or tools, and continues to alert authorities if the stolen item is moved.
Implementation Method 1
a touch-sensitive sensor device which is configured to record and convert a touch into an electrical touch signal
Implementation Method 2
The enquiry device and the identification device can be configured to wirelessly emit and receive the enquiry signal and the identification signal, respectively
Data Source
AI summary
The disclosure relates to an alarm system with a portable identification device and a portable alarm device, wherein the identification device is configured to receive an enquiry signal and in reaction thereto to emit an identification signal, and the alarm device comprises: a touch-sensitive sensor device, an enquiry device, which is configured to emit the enquiry signal and to receive the identification signal, and a control device, the control device being configured: in reaction to the touch signal to emit the enquiry signal by way of the enquiry device, to compare the identification signal received as a reaction to the enquiry signal with a predefined identification in order to carry out an identity check, and to emit an alarm signal if the identity check is negative. The disclosure also relates to a method for triggering an alarm signal.