Aerosol Cartridge Liquid Level Sensing With Electrode Detection
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Solution Overview
Problem
Existing aerosol generating devices lack precise measurement of the liquid content in cartridges, leading to inefficiencies and potential misuse or waste.
Innovation Solution
Incorporation of a sensor unit with strain gauges on the chamber wall to detect resistance changes and a controller to calculate liquid levels, along with a motion sensor to activate liquid measurement when the device is held correctly, ensuring accurate determination of liquid levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor unit with strain gauges is added to measure liquid levels, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement systems with electrical sensing. Instead of using mechanical float indicators or visual inspection, the system uses strain gauges that convert mechanical deformation (chamber wall compression) into electrical resistance signals, enabling precise liquid level measurement through electrical measurement rather than mechanical complexity
Solution Approach 2:
The patent introduces an intermediary sensing mechanism where the chamber wall itself acts as a transducer. The strain gauges are attached to the chamber wall, which deforms under liquid pressure. This intermediary approach allows indirect measurement of liquid level through the deformation of the chamber structure, avoiding the need for direct contact sensors inside the liquid
2Measurement precision
If multiple strain gauges are arranged along the chamber, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the measurement function into multiple discrete strain gauge elements arranged along the chamber wall. Each strain gauge measures local deformation at its position, and the combined data provides comprehensive liquid level information. This segmentation allows for precise measurement while maintaining modular manufacturing, as each strain gauge can be independently positioned and calibrated
3Reliability
If motion sensor activation is added to ensure proper device orientation, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary verification of device orientation before activating the liquid level measurement function. The motion sensor detects whether the device is held in the correct orientation, and only if this preliminary condition is met does the system proceed to activate the strain gauge measurement. This prevents unreliable measurements from occurring due to improper device handling
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 precise measurement of liquid in cartridges, preventing misuse and optimizing device performance by ensuring adequate liquid is available for vaporization.
Implementation Method 1
a sensor unit disposed on an outer wall of the chamber and including one or more strain gauges configured to detect a change in resistance corresponding to deformation of the outer wall
Implementation Method 2
a sensor unit disposed on a side surface in the chamber and including a common electrode and one or more level electrodes, and a controller configured to calculate an amount of the liquid aerosol generating material in the chamber, based on whether there is electrical connection between the common electrode and the one or more level electrodes
Data Source
AI summary
An aerosol generating device includes a cartridge including a chamber in which a liquid aerosol generating material is stored, a sensor unit disposed on a side surface in the chamber and including a common electrode and one or more level electrodes, and a controller configured to calculate an amount of the liquid aerosol generating material in the chamber, based on whether there is electrical connection between the common electrode and the one or more level electrodes.