Temperature-Sensing RFID Thermal Coupling and Shielding Layout
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Solution Overview
Problem
Existing temperature-sensing RFID devices face challenges in accurately measuring the temperature of an article due to interference from environmental conditions, as they often detect local environmental temperatures rather than the temperature of the article they are secured to.
Innovation Solution
The implementation of a shielding structure and/or a thermally conductive or absorbent structure in temperature-sensing RFID devices to protect the sensor from environmental factors and enhance thermal coupling with the article, respectively, ensuring accurate temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the RFID device is positioned close to the article for accurate temperature sensing, then measurement precision improves, but the device becomes more susceptible to environmental temperature interference
Solution Approach 1:
The RFID device is segmented into distinct functional components: a temperature sensor integrated with the RFID chip, a thermally conductive structure for heat transfer, and a shielding structure for environmental protection. This segmentation allows each component to perform its specific function optimally while working together to resolve the contradiction between measurement precision and environmental susceptibility.
Solution Approach 2:
A thermally conductive structure is introduced as an intermediary between the RFID device and the article, facilitating efficient thermal coupling for accurate temperature sensing. Simultaneously, a shielding structure acts as an intermediary barrier between the temperature sensor and the external environment, protecting against harmful thermal interference while allowing the sensor to accurately measure the article's temperature.
2Measurement precision
If a shielding structure is added to protect the temperature sensor from environmental factors, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The temperature sensor is merged with the RFID chip into a single integrated component, eliminating the need for separate sensor housing and reducing overall device complexity. The shielding structure is designed to envelop both the RFID chip and temperature sensor together, creating a unified protected assembly that simplifies the overall device architecture while maintaining measurement precision.
Solution Approach 2:
The shielding structure serves multiple functions simultaneously: it provides thermal protection from environmental factors, maintains the integrity of the RFID signal, and structurally supports the integrated RFID chip and temperature sensor assembly. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Measurement precision
If a thermally conductive structure is used to enhance thermal coupling with the article, then temperature detection accuracy improves, but the device becomes more sensitive to environmental thermal influence
Solution Approach 1:
The device exhibits different thermal properties in different locations: the thermally conductive structure has high thermal conductivity to efficiently transfer heat from the article to the sensor, while the shielding structure has low thermal conductivity to block environmental thermal influence. This local differentiation of thermal quality allows the device to simultaneously achieve accurate temperature detection and environmental protection.
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 proposed solution effectively shields the RFID device from environmental influences and enhances thermal coupling, leading to more accurate and reliable temperature sensing of the article, reducing the impact of transient temperature fluctuations and improving measurement accuracy.
Implementation Method 1
An antenna is electrically coupled to the RFID chip and adapted to receive energy from an RF field and produce a signal
Implementation Method 2
The shielding structure is configured to shield the temperature sensor from at least one environmental factor capable of affecting a temperature sensed by the temperature sensor
Implementation Method 3
A thermally conductive or absorbent structure is associated with the RFID chip and oriented so as to be positioned between at least a portion of the RFID chip and an article to which the temperature-sensing RFID device is to be secured. The thermally conductive or absorbent structure is configured to enhance thermal coupling between the temperature sensor and the article
Data Source
AI summary
A temperature-sensing RFID device includes an RFID chip and an antenna electrically coupled thereto. The RFID chip includes a temperature sensor, while the antenna is adapted to receive energy from an RF field and produce a signal. A shielding structure and/or a thermally conductive or absorbent structure may be associated with the RFID chip. The shielding structure is oriented so as to be positioned between at least a portion of the RFID chip and an outside environment and configured to shield the temperature sensor from at least one environmental factor capable of affecting a temperature sensed by the temperature sensor of an article to which the RFID device is secured. The thermally conductive or absorbent structure is oriented so as to be positioned between at least a portion of the RFID chip and the article and configured to enhance thermal coupling between the temperature sensor and the article.