Liquid surface tension coefficient measuring device based on optical fiber FP cavity

Abstract

The invention discloses a liquid surface tension coefficient measuring device based on an optical fiber FP cavity. According to the device, a broadband spectrum with the central wavelength being 1550nm is used as a measuring light source, a single-mode hollow core optical fiber is used as the FP cavity, detected liquid enters the hollow core optical fiber under the capillary action, the length of the hollow core optical fiber, namely the FP cavity, is changed, the change of interferometric fringes of output light is caused, and the surface tension coefficient of detected liquid can be obtained by monitoring the change. The device has the advantages that the liquid surface tension coefficient can be measured accurately by using the change of the interferometric fringes of the light, the measuring accuracy is high, the structure is simple, the use is convenient, the defects that the accuracy is low, the controllability is poor and the like caused by individual operation in conventional measuring methods are avoided. A method is suitable for being used in occasions in which the liquid surface tension coefficients are required to be measured fast and accurately in scientific researches, medical science and the like.

Description

technical field [0001] The invention belongs to the field of liquid surface parameter measurement, in particular to a measuring device capable of measuring the surface tension coefficient of liquid. technical background [0002] Liquid surface tension determines the flow ability and characteristics of liquid substances, and is the source of power for liquid substances in microscopic capillaries to invade solid substances. It has long been highly concerned by researchers in the field of fluid materials at home and abroad. The traditional methods for measuring the surface tension coefficient of liquids include pull-off method, hanging ring method, drop weight method, capillary rise method, etc. These methods, due to the poor controllability of the measurement intermediate parameters and the differences in individual operations with manual participation, lead to slow measurement speed. , low precision, unable to meet the needs of the application field. In recent years, with th...

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Problems solved by technology

Some researchers have used the capillary waves on the surface of the liquid to be measured combined with the principle of free space light interference to measure the surface tension coefficient of the liquid. However, this method has a large amount of calculation, and is affected by the measurement environment and other aspects. The accuracy of the measurement results is not high and the reliability is low.

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