OPTICAL TENSIOMETER FOR MEASUREMENT OF CONTACT ANGLE OF WETTING ON PREPARATION OF ROCK BY METHOD OF ATTACHED BUBBLE AND METHOD OF ITS OPERATION Russian patent published in 2021 - IPC G01N13/00 G01N1/28 

FIELD: physics.

SUBSTANCE: invention relates to investigation of physical and chemical properties of surface and is intended for determination of contact angle of wetting of interface of gas and solid phases of sample of rock, presented in form of powder. Disclosed is an optical tensiometer for measuring the contact angle of wetting on powdered preparations of rock by an attached bubble method, made in the form of a thermostatic optically transparent bath, equipped with a dosing air pipeline consisting of a piston in the sleeve and a reverse needle, equipped with a holder and an optically digital unit. Optical tensiometer further comprises a mirror, as well as a system of magnetic drives with the possibility of supplying a back needle of the air duct-batcher to the surface of the preparation of mine rock. Bath is equipped with pump-regulator of water level, and holder is float-holder of mine rock preparation, containing platform of waterproof material of constant thickness with uniformly distributed mass and density below density of water with fixatives for preparation of mine rock, made mainly in the form of lugs and / or bundles. Float-holder is a water-immersed float with possibility of controlling its position in horizontal plane using a system of magnetic drives. On the upper side of the float-holder there is a bubble level, which makes it possible to control horizontality of the float-holder. What is also presented is a method for operation of an optical tensiometer, which consists in the fact that a float-holder is installed with a preliminarily prepared preparation of mine rock attached to its lower side by means of fixators in a bath with water. Further, the air guide-dispenser needle is brought back to the surface of the mine rock preparation. Bubble attached to the surface of the rock preparation is placed on the optical axis of the camera lens. Attached bubble is smoothly aligned with the optical axis of the chamber. Thereafter, the bubble is photographed and the image is stored in the digital camera memory. On obtained image of bubble there made is measurement of contact angle of wetting of surface of mine rock preparation with the help of protractor.

EFFECT: high accuracy of measuring contact wetting angle.

2 cl, 3 dwg