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SURFTENS PD Software for measurement of liquid surface tension by the "Pendant Drop Method" |
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The Knowledge
of surface tension is essential for many industries. It allows predictions about
wetting and adhesion behaviour. The companies who benefit from the development
work e.g. in the paint, lacquer and ink industry, the semiconductor and display
industry, detergent industry, water supply and distribution, the cosmetic,
pharmaceutical and dental industry and in biological engineering or they produce
textiles, plastics and glues, films or optical equipment. The consistent use of
measurement of the surface tension facilitates specific development of products
and optimization of the requested physical and chemical properties.
Comfortable Windows software For determination of the surface tension by the pendant drop method the 32 Bit Software SURFTENS 4.2 PD is used. This program, descended from the COMEF family, features comfortable functions for representation the drop and measurement of the surface tension. The generation of the drop is carried out by a device of the SURFTENS family. For the determination of the surface tension a drop shape analysis is made. The measured parameters are drawn in the video image. Through an iterative procedure a theoretical drop profile is fitted to the experimental drop profile. The required calibration of the system is carried out with different subpixelalgorithm that guarantee highest precision. Calibration is needed everytime the magnification, or even the position of the needle, is changed. Notice: the error in surface tension will be twice the error in calibration. The densities of the used test media and the surrounding media are parameters that are essential for exact computation of the surface tension. They have to be put in by the user. The program provides an extra window for entering the densities. The settings used last are remembered by the program. The collected data can be analysed in standard protocols, that provide statistic analyses as mean or standard deviation. The user has also the possibility to choose user defined protocols that are freely configurable. Even a formula editor is integrated. The measurement results can also be stored from the standard protocol into ASCII files and can therefore be further processed in any possible way.
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Technical parameters Windows image processing software for determination of the surface tension of liquids by the pendant drop method with: live video representation in connection with OEG-frame-grabber for analogue standard video CCD-cameras live video representation for special Megapixel-Digital cameras Image acquisition from all sources with Twain-Interface representation of any digital pictures up to (4096 x 4096) pixels picture scaling (with conversion of the calibration values) automatic computation of the optimum scaling factor for a screen-filling representation calibration with subpixel algorithm comfortable picture inscription with texts and rulers to scale (also at the scaled picture), measuring values, measuring markers,... saving / printout of BMP- and JPEG-format - picture picture in intermediate file copy/insert from intermediate file hair cross insertion grid insertion Statistics and measurement error analysis Analysis optional in standard protocols or in freely configurable measurement protocols Data export as ASCII-File Input of densities of the used media
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Image sources Measuring functions: Operating system:
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Technical data are subject to change without notice