Wearable-Compatible Heat Flux Sensors
Conventional body temperature measurement relies on surface temperature or axillary/oral temperature readings, which can differ from core body temperature and are unsuitable for continuous measurement or real-time monitoring.
To address this challenge, TopoLogic has developed a heat flux sensor utilizing topological materials.
Topological materials enable extremely high-sensitivity, high-speed thermal detection due to their unique physical properties. By applying this principle, it becomes possible to non-invasively capture fluctuations in deep body temperature in real time, even from minute changes in heat flow.
Furthermore, unlike heat flux sensors using other methods, this topological material can be applied to compact integrated heat flux sensors combining ICs and sensors, making it a promising candidate for wearable devices.
This sensor technology is implemented as a compact, lightweight wearable device that can be worn on the wrist or similar location, enabling continuous body temperature monitoring during daily activities.
Based on detected heat flux data, a proprietary algorithm instantly analyzes and evaluates abnormal body temperatures, providing early warnings for conditions such as fever, hypothermia, and heatstroke risk.
This real-time, high-accuracy sensing is expected to find applications not only in personal health management but also across various fields including healthcare, nursing care, and sports.
The Difference Between Heat Flux Sensors and Thermometer
“Heat” = A type of energy alongside electrical energy, mechanical energy, etc.
“Temperature” = An indicator representing the state altered by the transfer or flow of thermal energy
This image illustrates the difference between a “heat flux sensor” and a “thermometer” when heating a metal plate.
As shown in the figure, the heat flow sensor instantly detects the flow of heat. On the other hand, the thermometer detects temperature fluctuations.
Heat Flux Sensor TL-SENSING™ (QFN Package)
Overview
Heat Flux Sensor TL-SENSING™
World’s First* Dual-Heat-Sink QFN Package Heat Flux Sensor for IoT Devices and Wearables
*As of December 2025, / Company research
⚫︎100x faster sensing
⚫︎1/1000 thinner structure
⚫︎Installable to PCB
The package features lead frames on both sides, enabling efficient heat dissipation from either the top or bottom.
Furthermore, the package has been miniaturized, making surface mounting possible.
< Package : QFN 5x5x1.1mm >
Demo Movie
Located a heater on the center of the PCB, a thermometer on its left and TL-SENSING on its right. As heat is generated from the heater and transferred to two sensors, we monitored the reaction.
▼Heat Flux Sensor TL-SENSING™ (QFN Package) Demo Movie
※The speed at which heat is transmitted to each sensor is the same across the entire substrate.
▼Demo results
Heat Flux Sensor TL-SENSING™
TL-SENSING detected heat immediately.
As heater stopped generating heat, TL-SENSING detected the heat reduction immediately.
Thermometer
Thermometer started detecting gradual rise in the temperature. Thermometer hit the highest temperature after 15 seconds.
The temperature rose gradually because of heat flowing, the movement of heat cannot be detected instantaneously.
Applications for TL-SENSING™
TL-SENSING™ solves all “heat” challenges through its application in heat management and high-efficiency control.
[Application example]
EV battery sensing, Power electronics, Machine components, Flammable gas-sensing, Core body temperature etc.
Manage “Heat” with TL-SENSING™ ?
Our business model is centered on “engineering” and “IP licensing,” and we are currently conducting Proof of Concept (PoC) with multiple partner companies.
We can perform comparative experiments with your current sensors in your specified environment.
Case 1 : Electronics Component Manufacturer
Development of Ultra-Compact High-Sensitivity Thermal Sensor Module
Case 2 : Power Infrastructure Company
Visualization of Stationary Battery Heat Generation
Case 3 : Air Conditioning Manufacturer
Measurement and Analysis of Motor Heat Loss
If you are interested in our technology, please feel free to reach out. We will do our utmost to serve as your partner in creating new industries.
please contact us at <info@topologic.jp>.
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