Susceptor Temperature Sensing by Magnetic Force in Aerosol Heaters
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Solution Overview
Problem
Existing non-contact temperature detection methods for aerosol-generating devices using Curie temperature are inconsistent and inaccurate due to dependence on susceptor physical properties and ambient temperature inference, and contact methods risk damaging temperature sensors.
Innovation Solution
An aerosol-generating device measures susceptor temperature using a non-contact method by detecting changes in magnetic force through a magnetic force detector, allowing accurate temperature calculation independent of susceptor Curie temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is directly attached to the susceptor for contact temperature measurement, then the temperature can be measured directly, but the temperature sensor is likely to be damaged due to heat and power efficiency is lower
Solution Approach 1:
The patent introduces a magnetic force detector as an intermediary device that measures temperature indirectly by detecting changes in the susceptor's magnetic force rather than placing a temperature sensor in direct contact with the hot susceptor. This mediator approach allows temperature measurement while protecting the sensing device from thermal damage.
Solution Approach 2:
The patent replaces the mechanical/thermal contact measurement system with a magnetic field-based detection system. Instead of using a temperature sensor that requires physical contact and thermal conduction, the system uses a magnetic force detector to measure temperature through non-contact magnetic property changes of the susceptor.
2Measurement precision
If a temperature sensor is directly attached to the susceptor, then temperature can be detected, but power efficiency is lower compared to non-contact methods
Solution Approach 1:
The patent replaces the energy-intensive contact temperature sensing method with a magnetic field-based detection method. The magnetic force detector consumes less power by detecting magnetic property changes remotely, eliminating the need for thermal conduction and reducing overall energy requirements of the heating system.
Solution Approach 2:
The susceptor's own magnetic properties are utilized to provide temperature information. The heating coil generates a magnetic field that interacts with the susceptor's magnetic properties, and the magnetic force detector measures the resulting changes, allowing the system to use the susceptor's inherent characteristics for self-diagnosis of its thermal state.
3Reliability
If Curie temperature method is used for non-contact temperature detection, then temperature can be measured without contact, but results are inconsistent and inaccurate due to dependence on susceptor physical properties and ambient temperature
Solution Approach 1:
The patent monitors changes in magnetic force parameters of the susceptor as a function of temperature. By tracking how the magnetic force changes with temperature under a constant magnetic field, the system can determine temperature based on these parameter variations, providing more consistent and accurate measurements than fixed Curie temperature points.
Solution Approach 2:
The system continuously monitors the magnetic force changes and uses this feedback to calculate and control the temperature. The magnetic force detector provides real-time data about the susceptor's magnetic state, which the controller uses to determine temperature and adjust heating accordingly, improving both accuracy and consistency.
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 device accurately measures susceptor temperature without sensor damage, enhancing power efficiency and precision by detecting magnetic force changes rather than ambient temperature.
Implementation Method 1
a coil configured to heat the susceptor
Implementation Method 2
a magnetic force detector configured to detect a change in magnetic force of the susceptor according to a temperature change
Implementation Method 3
a controller configured to calculate a temperature of the susceptor based on the change in the magnetic force detected by the magnetic force detector
Data Source
AI summary
An aerosol-generating device includes a susceptor arranged to be inserted into an aerosol-generating substrate, a coil configured to heat the susceptor by induction heating, a magnetic force detector configured to detect a change in magnetic force of the susceptor according to a temperature change, and a controller configured to calculate a temperature of the susceptor based on the change of the magnetic force detected by the magnetic force detector. Accordingly, the aerosol-generating device accurately measures the temperature of the susceptor in a non-contact manner.