Method and apparatus for determining the contact angle of a drop

Details Method and apparatus for determining the contact angle of a drop Method and apparatus for determining the contact angle of a drop

1985-12-04

1987-08-25

Rosenberger, R. A.

Optics: measuring and testing

Angle measuring or angular axial alignment

With screen

356138, G01B 1126

Patent

active

046889388

ABSTRACT:
A support (56) is suitable for holding a substrate (10) horizontal, said substrate having a drop of liquid placed thereon. A source of light (74) associated with a collimator (78) forms a primary beam of parallel light which is directed perpendicularly (86) to the substrate. A receiver surface (126, 128) having a known geometry and placed in a known position relative to the substrate intercepts a secondary beam (124) produced by interaction between the primary beam and the drop and the substrate. The value of the contact angle between the drop and the substrate may be deduced from the illuminated zone on said receiver surface.

REFERENCES:
patent: 3535043 (1968-12-01), Hong
"Apparatus for Measuring the Contact Angles at Crystal-Solution-Vapor Interfaces", McLachlan, Jr. et al, Rev. Sci. Instruments, vol. 46, #1, 1/1975, pp. 80-83.
"A New Method of Determining the Contact Angle Made by a Sessile Drop Upon a Horizontal Angle (Sessile Drop Contact Angle), Ryley, Journal of Colloid and Interface Science, vol. Sq, #2, Apr. 1972, pp. 243-251.

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