Passive RFID Impact Indicator With Mechanical Latch Detection
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Solution Overview
Problem
Existing impact indicators require internal power sources and complex configurations, making them inefficient for monitoring sensitive objects during manufacturing, storage, and transit, as they fail to provide reliable and irreversible detection of acceleration events without external power.
Innovation Solution
A passive RFID-based impact indicator with a mechanical switching mechanism that detects acceleration events using a mass member and spring system, providing a change in switch circuitry state without internal power, allowing for visual and electronic indications of impact without the need for batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive RFID-based mechanical switching mechanism is used, then device complexity and power requirements are reduced, but measurement precision and reliability of impact detection may be compromised
Solution Approach 1:
The patent replaces electronic sensing systems with a purely mechanical detection mechanism. A mass member connected to a substrate through a mechanical link forms a spring-mass system that naturally responds to acceleration events. The mechanical displacement of the mass member directly actuates a reed switch, eliminating the need for complex electronic sensors, power management circuits, and processing electronics while maintaining reliable impact detection capability
Solution Approach 2:
The mechanical system is self-activating and requires no external power source. The acceleration event itself provides the energy to displace the mass member and trigger the switch. The passive RFID tag is energized by the reader's electromagnetic field to report the impact status, making the entire detection system autonomous and eliminating battery requirements
2Reliability
If internal power sources are used, then detection reliability is improved, but weight and device complexity increase
Solution Approach 1:
The system eliminates internal power sources by using the external RFID reader's electromagnetic field to energize the tag when needed. The mechanical detection system requires no power for operation as it passively responds to acceleration events through physical laws. This removes batteries and power management components, significantly reducing device weight while maintaining reliable detection through the inherently stable mechanical spring-mass system
Solution Approach 2:
The patent extracts and removes the power source component from the detection system entirely. By using a passive RFID architecture combined with a mechanical switch, the design eliminates batteries, voltage regulators, and other power-related components, reducing weight and complexity while relying on the external reader for periodic status verification
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
Enables efficient, battery-free detection and irreversible indication of impact events, ensuring sensitive objects are monitored effectively during transit and storage, enhancing quality control and safety by providing accurate and reliable data without additional power sources.
Implementation Method 1
a passive radio-frequency identification (RFID) module coupled to the switch circuitry
Implementation Method 2
a mass member movable from a first position to a second position in response to receipt of an acceleration event
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
According to one aspect of the present disclosure, a device and technique for impact detection includes a housing enclosing a mass member where the housing is configured to enable movement of the mass member from a first position to a second position within the housing in response to receipt by the housing of an acceleration event. The impact indicator also includes switch circuitry and a passive radio-frequency identification (RFID) module coupled to the switch circuitry. Responsive to movement of the mass member from the first position to the second position, the mass member causes a change in the switch circuitry where the change in the switch circuitry causes a change in a value output by the RFID module when activated.