Body Temperature Measurement Using Thermal Resistor Equilibrium Detection
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Solution Overview
Problem
Existing body temperature measuring devices struggle to accurately eliminate the influence of external disturbances and quickly detect heat generation, as they rely on inverse calculation models that do not effectively correct for ambient temperature changes and can be delayed in grasping heat generation in a short time span.
Innovation Solution
A body temperature measuring device with a temperature detection section using thermal resistors and multiple temperature sensors to determine thermal equilibrium, allowing for the acquisition of body temperature data only when the system is in equilibrium, thereby eliminating noise and enabling faster detection of heat generation without the need for large time constant filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If body temperature is estimated from body surface temperature data using inverse calculation model, then body temperature can be continuously measured, but the influence of disturbance such as outside air temperature cannot be appropriately eliminated
Solution Approach 1:
The patent introduces a thermal resistor as an intermediary element between the body surface and the temperature sensor. This thermal resistor acts as a mediator that filters out rapid temperature changes from the environment while allowing the sensor to detect body temperature variations. The thermal resistor's thermal inertia prevents direct transmission of external temperature disturbances to the sensor, thereby eliminating the harmful influence of outside air temperature fluctuations on measurement accuracy.
Solution Approach 2:
The patent changes the thermal parameters of the detection system by introducing a thermal resistor with specific thermal resistance and heat capacity values. By carefully selecting these thermal parameters, the system transforms the temperature detection characteristics to respond slowly to external disturbances while maintaining sensitivity to body temperature changes. This parameter optimization allows the system to distinguish between genuine body temperature variations and environmental noise.
2Reliability
If body temperature is estimated from body surface temperature data measured for several hours, then the influence of fluctuation in measurement is suppressed, but it is difficult to grasp heat generation in a relatively short time
Solution Approach 1:
The thermal resistor serves as a temporal filter that selectively attenuates high-frequency temperature variations (environmental noise) while preserving low-frequency variations (body temperature trends). This intermediary element enables the system to achieve reliable temperature measurement without requiring several hours of data collection, as it can detect heat generation in much shorter time spans by filtering out measurement fluctuations through its thermal characteristics.
3Reliability
If low pass filter with large time constant is used to eliminate noise, then measurement stability is improved, but response time to detect heat generation is increased
Solution Approach 1:
The patent replaces the conventional electronic low pass filter (which uses electrical components and time constants) with a thermal filter consisting of a thermal resistor and temperature sensor. This substitution of the filtering mechanism allows the system to achieve noise elimination through thermal physics rather than electrical signal processing. The thermal resistor's physical properties provide natural noise filtering without the time delay inherent in electronic filtering systems, thereby maintaining both measurement stability and rapid response capability.
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
This approach effectively eliminates the influence of disturbances and allows for the rapid detection of heat generation, providing accurate body temperature measurements even in the presence of sudden ambient temperature changes.
Implementation Method 1
a temperature detection section with thermal resistor and a plurality of temperature sensors that sandwich the thermal resistor and continuously detects temperature data
Data Source
AI summary
A body temperature measuring device includes a temperature detector including a first thermal resistor and a first pair of temperature sensors that sandwich the thermal resistor and continuously detect temperature data, and a second thermal resistor and a second pair of temperature sensors that sandwich the second thermal resistor and continuously detect temperature data. Moreover, an equilibrium state determination component determines whether the temperature detector is thermally in an equilibrium state based on detected temperature data, and a body temperature acquisition component acquires body temperature data based on temperature data detected when the temperature detector is in a thermal equilibrium state and a physical property value of the thermal resistors.