Abstract: A device and a method for foam analysis. The device comprises a cylindrical sample container with a transparent wall, at least one illumination device and a camera, which. can be moved on a track. The curvature of the web runs parallel to the wall of the container. The illumination device directs a light beam onto the wall of the cylindrical sample container at an angle which deflects the light beam into the sample vessel when liquid is present on the inside of the sample container and causes a total reflection when air or another gas fills the foam pores. The camera and the illumination unit are moved along the path in the circumferential direction of the wall of the sample container such that a region to be examined is illuminated in steps or in a continuous progression and the camera records the totally reflected light in the region.

Abstract: The subject matter of this invention is a device for measuring the contact angle of a liquid drop on a material surface. The shadow of a drop of a test liquid is projected onto a tilted shadow surface. An image of the drop on the shadow surface is recorded with an image recording device, and the contact angle is calculated from the image and the known angle of tilt of the shadow surface. A method that is suitable for this is likewise disclosed.

Abstract: A hand tensiometer for measuring the surface tension of liquids or for measuring of substance concentrations in a liquid wherein a gas volume stream entered from a gas source (10) through a buffer storage (11) into a measuring capillary (3) forms bubbles in the liquid at the end of the measuring capillary (3), and wherein means for steady measuring and for adjusting the gas volume stream are furnished.

Abstract: The invention relates to a device for dynamic measurement of the surface tension of a liquid by the bubble pressure process. The device is characterized by a moving measuring device with a flexible lead, conveying at least compressed air, to a sensor head which releases bubbles and can be immersed in the measuring liquid. The moving measuring device has an input keyboard for different operating modes, a display for monitoring the measuring modes and display of the measurement results, a volume flow source for generating the gas pressure, a pressure sensor for detecting the quality of gaseous bubbles, a microprocessor for measuring and evaluating the measurement results and an internal current supply for all power consumers.