Liquid surface tension measuring device and method based on light reflection

Abstract

The invention discloses a liquid surface tension measuring device and method based on light reflection. The device comprises a light source which is used for generating a parallel light beam, and a flat plate is obliquely disposed on a light path of the parallel light beam; droplets are arranged on the surface of the flat plate and close to one side of the light source; a linear array CCD and thelight source are arranged on the same side and are spaced up and down; parallel light beams irradiate the liquid drops; after the parallel light beams are reflected by the surfaces of the liquid drops, the reflected light beams are completely emitted into the linear array CCD, and the linear array CCD is used for collecting light intensity distribution of the reflected light beams and transmittingthe light intensity distribution to a computer. According to the invention, the a to-be-detected liquid drop is arranged on a glass sheet in an inclined direction, a gas-liquid interface of the to-be-detected liquid drop is irradiated by a light beam, the light beam on the gas-liquid interface is reflected, and the image of the diffraction signal after the phase modulation of the incident beam ofthe linear CCD is used; the surface tension coefficient of the to-be-measured liquid is solved by using various known parameters of the liquid and the density of the to-be-measured liquid; non-contact measurement is adopted in the measurement process; equipment is simple; and operability is high.

Description

technical field [0001] The invention belongs to the technical field of physical quantity measurement, in particular to a liquid surface tension measurement device and measurement method based on light reflection Background technique [0002] Surface tension is the force per unit length that the molecules in the liquid surface area contract inwardly due to the unbalanced force. Surface tension is one of the key factors affecting the interphase mass transfer and reaction of multiphase systems. It has important liquid physics. nature. It is very important to measure the surface tension coefficient of droplets in many applied sciences and engineering fields. At present, the traditional measurement methods include capillary rise method, William method, pendant drop method, drop volume method, maximum bubble pressure method or photographic imaging method, etc. The above-mentioned methods all belong to the direct measurement of manual operation, and are generally complicated in op...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems existing in the prior art, the present invention provides a liquid surface tension measurement device and measurement method based on light reflection to solve the existing optical The measurement method needs more samples to be tested, which is easy to cause waste, the cost of the measuring instrument is high, the operation is complicated and the technical problems of the absolute measurement of the liquid to be tested

Images