US 11,940,268 B2
Contact angle measuring device
Dong Sun, Xiamen (CN); Luming Song, Xiamen (CN); Xianjian Zhou, Xiamen (CN); Hongyi Lin, Xiamen (CN); Hong Liu, Xiamen (CN); Wenzhang Zhu, Xiamen (CN); and Haijun Lin, Xiamen (CN)
Assigned to Xiamen University of Technology, Xiamen (CN); and Riccino (Xiamen) Optical Inc., Fujian (CN)
Filed by Xiamen University of Technology, Xiamen (CN); and Riccino (Xiamen) Optical Inc., Fujian (CN)
Filed on May 6, 2022, as Appl. No. 17/738,452.
Claims priority of application No. 202110508411.1 (CN), filed on May 11, 2021.
Prior Publication US 2022/0364854 A1, Nov. 17, 2022
Int. Cl. G01B 11/26 (2006.01)
CPC G01B 11/26 (2013.01) 14 Claims
OG exemplary drawing
 
1. A contact angle measuring device, comprising:
a light source,
a container,
a photodetector,
a bubble generating unit,
a test bracket, and
a processing unit, wherein:
the container comprises a first side wall and a second side wall that is opposite to the first side wall,
the first side wall is made of a light-transmitting material,
the container is filled with liquid that is transmissive to light,
the light source is a monochromatic light source,
monochromatic light emitted by the light source passes through the first side wall and enters an interface between the first side wall and the liquid at a total reflection angle or at an angle greater than the total reflection angle,
the bubble generating unit is configured for generating a bubble that is in contact with an inner surface of the first side wall,
a detection surface of the photodetector is sealed through the second side wall to contact with the liquid for detecting light intensity distribution of the monochromatic light through the liquid,
an output of the photodetector is connected to the processing unit,
the detection surface of the photodetector is embedded in and is flush with an inner surface of the second side wall,
the bubble generating unit comprises a needle and an air source,
an air inlet of the needle is in communication with the air source,
the needle is sealed through the first side wall of the container,
an air outlet of the needle is provided on an inner side of the first side wall, and
the light source and the container are fixed on the test bracket.