Wick Moisture Sensor for Airborne Particle Condensation
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Solution Overview
Problem
Portable condensation instruments face challenges in maintaining wick saturation in the absence of a liquid reservoir, leading to reduced performance over time due to the consumption of the condensing fluid, especially in environments with motion or microgravity.
Innovation Solution
A wick moisture sensor that uses a light source and detector to assess the saturation level of a translucent, porous wick material, allowing for feedback control to maintain optimal moisture levels by adjusting the operating temperature of the condensation system, thereby extending the instrument's operational time without fluid replenishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid reservoir is used to maintain wick saturation, then the wick remains saturated with condensing fluid, but the instrument cannot tolerate tipping and motion or operation in microgravity
Solution Approach 1:
The patent extracts the liquid reservoir from the system and replaces it with a porous wick material that holds the condensing fluid through capillary action. This eliminates the free liquid reservoir that causes problems during tipping and motion, while still maintaining wick saturation through the porous structure's ability to retain fluid via surface tension and capillary forces.
Solution Approach 2:
The patent employs a porous wick material that utilizes capillary action to distribute and retain the condensing fluid throughout its structure. The porous structure provides high surface area and capillary forces that maintain fluid saturation without requiring a free liquid reservoir, enabling the instrument to function reliably during tipping, motion, and microgravity operations.
2Adaptability or versatility
If all working fluid is held within the wick itself without a reservoir, then the instrument tolerates tipping and motion, but the instrument fails after some hours of use as the condensing fluid is consumed
Solution Approach 1:
The patent implements a self-regulating system where the porous wick automatically maintains its own saturation level. The wick's porous structure provides continuous capillary action that distributes fluid throughout the material and allows it to self-replenish by absorbing ambient moisture or evaporated fluid, eliminating the need for external reservoir replenishment and enabling extended operational duration.
3Device complexity
If the wick saturation level is not monitored, then the system structure remains simple, but the performance degrades over time due to fluid consumption
Solution Approach 1:
The patent incorporates an optical sensor system that continuously monitors the wick's saturation level by detecting changes in light transmission through the porous material. This feedback mechanism provides real-time information about fluid levels, allowing the system to maintain optimal performance by triggering fluid replenishment or alerting users before detection efficiency degrades, thus balancing simplicity with reliable performance monitoring.
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 wick sensor effectively monitors and maintains the wick's saturation level, ensuring continuous operation for weeks to months by balancing water vapor uptake and removal, maintaining particle detection efficiency comparable to standard benchtop condensation particle counters.
Implementation Method 1
a light source configured to illuminate a surface of the wick... a detector configured to detect reflected light from the light source that is reflected by the wick
Implementation Method 2
a detector configured to detect reflected light from the light source that is reflected by the wick, and determine the intensity of reflected light
Implementation Method 3
the wick is formed from a porous media that is wettable by the liquid
Implementation Method 4
the wick is formed from a porous media that is wettable by the liquid, and becomes translucent when filled with the liquid
Implementation Method 5
the wick that holds the working fluid that vaporizes, and subsequently condenses on the particles
Implementation Method 6
the working fluid that vaporizes, and subsequently condenses on the particles
Data Source
AI summary
A wick liquid sensor suitable for use in a particle condensation device is provided. The sensor includes a light source configured to illuminate a surface of the wick. A detector is configured to detect wick reflected light from the light source and determine the intensity of reflected light. The wick is formed from a porous media that is wettable by the liquid, and becomes translucent when filled with the liquid. The amount of reflectivity decreases as the saturation content of the liquid in the wick increases.