To determine an analytical method that can be used to determine cleanliness of optic lenses.
Date Run:
01/31/2005
Experiment Procedure:
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.
Trial Results:
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
Success Rating:
A cleanliness study, addressing only various analytical techniques.
Conclusion:
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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