| 摘要 |
<p>The invention relates to a mobile equipment for the advanced investigation of surface tension of liquids at various temperatures, based on the surface increase rate in a drop of a liquid to be analyzed, upon low-amplitude vibrating the same at a frequency of 15 Hz. According to the invention, the equipment comprises a Peltier-type thermoelectric element (2) made as a cylinder-shaped disc provided with a temperature sensor (3), a controlled frequency piezoelectric actuator (4), an electronic phase and frequency comparator (5) employed for the control of the pulse frequency of the piezoelectric actuator (4) so that a complete pulse sinusoid corresponds to a unique and complete frame-type image acquired by means of a video camera (7) as a component of an optical stereo microscope (6) and a central electronic unit (8) for electronic data acquisition, a computer (9) and a printer (10).</p> |
