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Initial Designs
Initial Designs
We design three basic initial possibilities for our defogging glasses final design.
We design three basic initial possibilities for our defogging glasses final design.
Fan Design
Fan Design
Our design contains two thermal sensors, one directed at lens while the one is other directed at face. These thermal sensors detect the temperature near the lenses and trigger the micro-fans. The micro fans are located near either hinge of the frames. The battery pack and logic chip are found in temple tips. When the fans are turned on, air starts circulating around the glasses and the fog begins to disappear.
Chemical Design
Chemical Design
This design requires glass substrates to undergo plasma treatment in order to reduce its surface tension. A smaller surface tension means less formation of single water droplets. The substance would then be rinsed in a polymer and bonded to Polyvinyl Alcohol (PVA) to increase its durability. A chemical solution would not defog the glasses, but would prevent any fog from forming.
PEMA + PVA
PEMA + PVA
Heating Design
Heating Design
The heating design has an electrical circuit containing a battery, a humidity sensor, an IC chip, and a heating device. The humidity sensor triggers the IC chip which then turns on the heating device. When the heating around the lenses begins, the fog will disappear because the temperature of the lenses strays further away from the dew point temperature so water can no longer condense on them.
Deciding on a Final Design
Deciding on a Final Design
When deciding on our final design, we used our functional requirements as criteria in a decision matrix. We ranked each design on a scale of one to five depending on how well that design fit the criteria; one meaning the criterion was barely met, five meaning the criterion was completely met.
When deciding on our final design, we used our functional requirements as criteria in a decision matrix. We ranked each design on a scale of one to five depending on how well that design fit the criteria; one meaning the criterion was barely met, five meaning the criterion was completely met.
The heating design not only had the highest score, but had no low numbers for any of the criteria; this was our final design.
The heating design not only had the highest score, but had no low numbers for any of the criteria; this was our final design.
Justifying the Design
Justifying the Design
Can the Wiring Fit in the Frames?
Can the Wiring Fit in the Frames?
The company Bose made a pair of sunglasses as seen to the left. These sunglasses play music directly into the wearer's ears and can connect to devices via Bluetooth. It is paramount to our justification that we bring these up because they prove that complicated electrical components can be made small enough to meet our requirement of being unobtrusive.
Did Previous Patents Already Have this Design?
Did Previous Patents Already Have this Design?
As mentioned in our research with patents, we found that many existing electronic-heat based designs were not automatic. We wanted to make sure that our design was automatic so users did not have to worry about starting the defogging on their own.
How was it Determined to Have the Heat Concentrated in One Spot?
How was it Determined to Have the Heat Concentrated in One Spot?
When concluding our visibility testing we determined what part of the glasses would need to be heated to make sure the wearer maintained visibility. This area was the inside corner of the lenses. While coming up with our design, we made sure to factor in that data so that we would be able to get rid of fog in that vital area first, and over the entire lens, in a timely manner.
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