Temperature-Sensing RFID Structure for Ambient-Resistant Article Sensing
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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 can be influenced by local environmental temperatures rather than the temperature of the article they are secured to.
Innovation Solution
The implementation of a shielding structure, which can be made of reflective or thermally non-conductive materials, and a thermally conductive or absorbent structure to protect the RFID chip from environmental factors and enhance thermal coupling with the article, ensuring accurate temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the RFID device is exposed to the environment for easy attachment and operation, then ease of operation is improved, but measurement precision deteriorates due to environmental temperature interference
Solution Approach 1:
The RFID device is segmented into distinct functional zones: an environmental exposure zone (antenna, outer housing) that interacts with the environment for ease of attachment, and a protected sensing zone (temperature sensor, RFID chip) that is thermally isolated through shielding structures and thermal barriers. This segmentation allows different parts to serve different purposes without interfering with each other.
Solution Approach 2:
Thermal barrier structures and shielding elements act as intermediaries between the RFID device and the environment. These intermediaries block harmful thermal radiation and conduction from environmental sources while allowing the device to remain attached to the article for easy operation and monitoring.
2Measurement precision
If shielding structures are added to protect from environmental interference, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The housing and structural elements of the RFID device are designed to serve multiple functions: providing mechanical protection, enabling attachment to articles, and simultaneously acting as thermal shields and barriers. This multi-functionality reduces the need for separate dedicated shielding components, thereby limiting the increase in device complexity.
Solution Approach 2:
The shielding structures utilize changes in thermal parameters (thermal conductivity, emissivity, reflectivity) of materials to achieve protection. By selecting materials with appropriate thermal properties and configuring their geometry, effective environmental shielding is achieved without requiring complex active control systems or multiple layers of protection.
3Measurement precision
If thermal coupling with the article is enhanced for accurate sensing, then measurement precision is improved, but susceptibility to environmental heat transfer increases
Solution Approach 1:
The thermal coupling interface between the RFID device and the article is optimized locally with high thermal conductivity materials and direct contact surfaces to maximize heat transfer from the article to the sensor. Simultaneously, the surrounding areas are equipped with thermal barriers and shields to block environmental heat, creating a localized high-quality thermal path that is insensitive to external conditions.
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 chip from environmental influences, improving the accuracy of temperature sensing by reducing thermal coupling with external environments and enhancing the detection of the article's temperature, leading to more reliable temperature readings.
Implementation Method 1
shielding structure, which can be made of reflective or thermally non-conductive materials
Implementation Method 2
shielding structure... made of reflective or thermally non-conductive materials
Implementation Method 3
thermally conductive or absorbent structure to protect the RFID chip from environmental factors and enhance thermal coupling with the article
Data Source
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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.