Passive RFID Temperature Probe Wireless Power and Data Transmission
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Solution Overview
Problem
Conventional temperature measurement tools are bulky, require batteries, have short service lives, and lack data management and transmission capabilities, making them inconvenient and unsafe for use.
Innovation Solution
A temperature probe and measuring device that uses a passive RF identification chip, antenna, and temperature sensor, powered by electromagnetic waves, allowing for battery-free operation, small size, and data transmission to a reader, which can then send information to smartphones or computers via Bluetooth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electronic thermometers are used, then temperature measurement function is achieved, but the device becomes bulky and requires battery power
Solution Approach 1:
The patent replaces the conventional battery-powered electronic system with a passive RFID system that uses electromagnetic fields for both power supply and data transmission. The temperature probe contains no battery or mechanical power supply components, instead using an RFID chip that harvests energy from the electromagnetic field generated by the reader device, thereby eliminating the need for bulky battery compartments and power management circuits.
Solution Approach 2:
The RFID system performs multiple functions simultaneously: it provides wireless power transfer to the temperature probe, transmits measurement data from the probe to the reader, and enables bidirectional communication. This multi-functionality eliminates the need for separate power supply, data transmission, and communication components that would otherwise increase device volume.
2Measurement precision
If conventional electronic thermometers are used, then temperature measurement is enabled, but service life is short due to battery limitations
Solution Approach 1:
The patent extracts and removes the battery component entirely from the temperature probe system. By using a passive RFID architecture, the probe requires no internal power source, eliminating the fundamental limitation of battery capacity and extending service life to be limited only by the durability of the electronic components themselves, not by power supply duration.
Solution Approach 2:
The temperature probe harvests its own operating energy from the electromagnetic field generated by the reader during the measurement process. This self-powering mechanism eliminates dependency on pre-charged batteries and allows the probe to be used indefinitely as long as it remains within the reader's electromagnetic field range during measurement.
3Measurement precision
If conventional temperature measurement tools are used, then temperature detection is achieved, but data transmission and management capabilities are lacking
Solution Approach 1:
The RFID system introduces an electromagnetic field as an intermediary medium that carries both power and data between the reader and the temperature probe. This intermediary enables wireless bidirectional communication, allowing the probe to transmit temperature measurements and receive commands without physical connections, thereby achieving comprehensive data transmission and management capabilities.
Solution Approach 2:
The patent replaces physical data storage and manual recording mechanisms with wireless RFID-based data transmission. Temperature measurements are automatically transmitted via electromagnetic fields to the reader, which can then store, process, and manage the data digitally, eliminating information loss associated with manual recording or local storage limitations.
4Measurement precision
If conventional temperature measurement tools are used, then temperature measurement is achieved, but safety and convenience are compromised
Solution Approach 1:
The patent removes batteries and wired connections from the temperature probe, eliminating safety hazards associated with battery leakage, overheating, and electrical shocks. The wireless passive RFID design also eliminates tripping hazards and entanglement risks from cables, significantly improving user safety and convenience.
Solution Approach 2:
The patent replaces mechanical and electrical power delivery systems with electromagnetic field-based wireless power transfer. This substitution eliminates physical contact requirements, reducing the risk of electrical shock and making the device more convenient to use in various environments without safety concerns related to power connections.
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 safe, convenient, and efficient temperature measurement with a long service life, allowing for precise data management and transmission, suitable for various applications including home and hospital use.
Implementation Method 1
the antenna connected to a capacitor of the coupling element so as to form a resonance circuit and configured to sense electromagnetic wave emitted from a reader and store energy acquired in the capacitor
Implementation Method 2
the antenna connected to a capacitor of the coupling element so as to form a resonance circuit
Implementation Method 3
The temperature sensor is a thermistor sensor
Data Source
AI summary
A temperature probe includes: an antenna, a coupling element, a radio frequency identification (RFID) chip and a temperature measuring circuit. The antenna is connected to a capacitor in the coupling element to form a resonant loop, and is configured to sense an electromagnetic wave emitted by a reader and a store harvested energy in the capacitor to supply power to the RFID chip. The RFID chip is connected to the antenna and the coupling element, and is configured to send stored electronic tag information to the reader via the antenna. The temperature measuring circuit is connected to the RFID chip, and is configured to detect temperature information of an object and to send the temperature information to the reader via the antenna. Also provided is a temperature measuring device. The temperature probe and the temperature measuring device do not require a battery, are small-sized, and have a long service life.