Trial #0
To determine an analytical method that can be used to determine cleanliness of optic lenses.
Contact angle goniometry was selected as the analytical method to evaluate surface cleanliness. A small (2microL) drop of water was placed on the surface. A Sony digital video camera attached to an Olympus 10x microscope was position toward the water-substrate interface. On the video screen, the angle of deflection was measured from the image produced using a hand held protractor next to the screen. Three readings were taken on the surface in three locations in order to insure a proper distribution. Two dirty lenses and one clean lens were measured and compared to each other.
Analyzing the plastic lenses using contact angle measurements revealed that the cleaner surface had lower readings than the dirty surfaces. The clean surface had an average reading of 51degs. The two dirty lenses had higher averages, 59 and 63. The table below lists the readings for each lens analyzed.
| Contact Angle Measurement
|
| Dirty Part -1
|
| Reading #
|
Location
|
Angle
|
| 1
|
Middle
|
60
|
| 3
|
Outer 3rd
|
48
|
| 4
|
Outer 3rd
|
68
|
|
|
Average
|
59
|
| Dirty Part -2
|
| 1
|
Middle
|
85
|
| 2
|
Outer 3rd
|
45
|
| 3
|
Outer 3rd
|
60
|
|
|
Average
|
63
|
| Clean Part -3
|
| 1
|
Middle
|
48
|
| 2
|
Outer 3rd
|
55
|
| 3
|
Outer 3rd
|
50
|
|
|
Average
|
51
|
Contact angle measurement appears to be a possible analytical method to analyze cleanliness of the plastic lenses. Next step will be to evaluate cleaners.
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