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

A liquid surface tension and measuring device technology, applied in the direction of surface tension analysis, etc., can solve the problems of low accuracy of measurement results, low reliability, and large amount of calculation, and achieve the effect of avoiding low accuracy, simple structure, and high measurement accuracy

CN103926175AInactive Publication Date: 2014-07-16CHINA JILIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-07-16
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings.

[0012] see figure 1 As shown, the optical fiber FP cavity liquid surface tension coefficient measurement device includes a wide-spectrum light source 1, an optical circulator 2, a liquid surface tension measurement sensor head composed of a fiber Bragg grating 3 and a hollow fiber 4, and a spectrum analyzer 5. The optical circulator 2 has three ports, wherein the input port is connected to the wide-spectrum light source 1, the output port is connected to any end of the fiber Bragg grating 3, the reflection port is connected to the spectrum analyzer 5, and the other port of the fiber Bragg grating 3 is connected to the air. Any end of the core fiber 4 is connected.

[0013] The working wavelength of the above-mentioned broadband light source is 1530nm-1570nm; the liquid surface tension measurement sensor head is composed of a fiber Bragg grating 3 and a hollow-core fib...