Optical E-Liquid Fill Sensing for Separable Aerosol Cartridges
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Solution Overview
Problem
In aerosol-generating systems, consumers cannot visually determine the e-liquid fill level in cartridges, leading to unexpected depletion and potential excessive heating, which can result in the generation of undesired compounds, and existing solutions face challenges due to the cartridge's separation from the device, lack of electrical power, and the need for accurate sensors that may interact with the e-liquid.
Innovation Solution
An aerosol-generating system comprising a cartridge with a storage compartment, a light source, and a detector, where the light source emits light into the compartment and the detector measures the absorption to determine the e-liquid fill level, with the light source and detector positioned adjacent to the same side of the compartment, allowing for accurate fill level monitoring without electrical contact with the e-liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is placed in contact with the e-liquid to measure fill level, then measurement precision is improved, but the e-liquid may contaminate the sensor or degrade it, increasing device complexity and cost
Solution Approach 1:
The patent uses the container wall as an intermediary medium to transmit light between the light source and detector without requiring direct contact with the e-liquid. The light passes through the container wall and e-liquid interface, enabling fill level detection while preventing sensor contamination.
Solution Approach 2:
The patent replaces mechanical/contact-based sensing with optical sensing. Instead of using a physical sensor that touches the e-liquid, the system uses light transmission through the container wall to detect fill level, eliminating the need for sealing and contamination prevention mechanisms.
2Ease of operation
If the cartridge is made separable from the device for convenience, then ease of operation is improved, but the cartridge lacks electrical power supply, making measurement challenging
Solution Approach 1:
The patent makes the container wall itself serve the dual function of both containing the e-liquid and acting as the measurement interface. The container wall transmits light optically, eliminating the need for separate power supply arrangements or electronic components in the portable cartridge.
Solution Approach 2:
The patent replaces electrical sensing systems that would require power supply with an optical sensing system. The light source and detector can be positioned externally or integrated without requiring complex power management in the separable cartridge.
3Volume of moving object
If the volume of liquid in the cartridge is made small to reduce size, then compactness is improved, but accurate sensors are required, increasing device complexity
Solution Approach 1:
The patent transitions from measuring liquid volume directly to measuring the air gap volume above the liquid. By detecting the distance from the container wall to the liquid surface through light transmission, the system achieves accurate fill level measurement in small volumes without requiring complex sensors.
4Device complexity
If the consumer cannot see the e-liquid level, then the cartridge design is simplified, but the consumer cannot know when refilling is needed, resulting in loss of information
Solution Approach 1:
The patent utilizes changes in light transmission properties (optical density) as the fill level changes. The detector measures variations in light intensity or absorption characteristics, providing fill level information without requiring visual transparency or color indicators on the container.
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 consumers to anticipate refills or replacements, preventing excessive heating and reducing the risk of undesired compound exposure by accurately monitoring the e-liquid level, thus ensuring continuous system use and safety.
Implementation Method 1
The light emitted from the light source may be absorbed by the liquid composition
Data Source
AI summary
An aerosol-generating system is provided, including: a cartridge including a storage compartment configured to contain a liquid composition including an aerosol-forming substrate; an aerosol-generating device configured to receive the cartridge and including a power supply and control electronics operably coupled to the power supply; a light source operably coupled to the control electronics and positioned and oriented to emit light into the storage compartment, light emitted from the source is absorbed by the liquid composition; and a detector operably coupled to the control electronics and positioned and oriented to detect light emitted from the source, the source and the detector are both located adjacent to a same side of the storage compartment, and a surface of the storage compartment opposite the source is configured to absorb light emitted into the storage compartment from the source.