Heating Element Selection via Optical Resistance Analysis
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Solution Overview
Problem
Heating elements for electronic vapor provision systems, such as e-cigarettes, often exhibit uneven resistive properties due to irregular structures, leading to inconsistent vapor production and potential device failure during product testing.
Innovation Solution
A method involving the use of optical analysis to determine the electrical resistance of electrically conductive porous materials by measuring light transmission, allowing for the selection or processing of suitable materials for use as heating elements, ensuring consistent resistive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conductive mesh structure is used for the heating element, then the heating element can be fabricated from porous material with capillary action for liquid transport, but the irregular resistive properties lead to uneven heating and inconsistent vapor production
Solution Approach 1:
The patent replaces the mechanical/optical inspection method with an electrical measurement method. Instead of using light transmission to assess material properties, the invention directly measures electrical resistance of the heating element to ensure it meets specifications. This substitution allows for precise quantification of resistive properties and enables automated selection or rejection of heating elements based on measured resistance values, thereby resolving the contradiction between ease of manufacture and manufacturing precision.
2Ease of operation
If light transmission measurement is used to assess material properties, then non-contact evaluation is possible, but the method does not directly correlate with electrical resistance which is the critical parameter for heating performance
Solution Approach 1:
The patent replaces the optical measurement system with an electrical measurement system. Instead of measuring light transmission through the material, the invention applies electrical voltage across the heating element and measures the resulting current to directly determine resistance. This substitution ensures that the measurement directly correlates with the critical heating parameter (electrical resistance) while maintaining ease of operation through non-contact or minimal-contact measurement methods using electrical probes.
Solution Approach 2:
The patent changes the measurement parameter from optical properties (light transmission) to electrical properties (resistance). By measuring the electrical resistance directly through applied voltage and current measurement, the system evaluates the heating element based on its actual heating performance characteristic rather than an indirect optical proxy. This parameter change ensures accurate assessment of heating capability while maintaining operational simplicity.
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 enables the identification and rejection of unsuitable materials, reducing the likelihood of device failure by ensuring heating elements with consistent resistance values, thereby improving vapor production consistency and product reliability.
Implementation Method 1
directing light onto at least a portion of the sheet; detecting an amount of the light transmitted through the portion of the sheet
Implementation Method 2
Operation of a heating element of this type relies on the phenomenon of resistive heating, where the electrical resistance of the heating element produces a temperature rise when a voltage is applied across the heating element to cause current to flow through it
Implementation Method 3
Capillary action or wicking in the porous element carries liquid from the reservoir to the heater for vaporization
Implementation Method 4
The temperature of the heating element is raised, such as by passing an electrical current from a battery through the heating element, and source liquid in contact with the heating element is vaporized
Data Source
AI summary
A method for obtaining a heating element for an electronic vapor provision system, the method including providing a sheet of electrically conductive porous material, directing light onto at least a portion of the sheet, detecting an amount of the light transmitted through the portion of the sheet, comparing the amount of light detected to a range of light transmission values known to correspond to a predetermined range of electrical resistance values required for the portion, and selecting the portion of the sheet for use as a heating element if the amount of detected light lies within the range of light transmission values, and otherwise rejecting the portion of the sheet.