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Method for nondestructive measurement of refractive index of transparent capillary wall and device thereof

A capillary, refractive index technology, used in the field of measuring the refractive index of the capillary wall

Inactive Publication Date: 2010-05-05
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in this process, the refractive index of the tube wall, which is used to measure the refractive index of the liquid in the capillary, is not yet known, and it needs to be provided by the manufacturer or other complicated experiments that damage the capillary can be obtained.

Method used

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  • Method for nondestructive measurement of refractive index of transparent capillary wall and device thereof
  • Method for nondestructive measurement of refractive index of transparent capillary wall and device thereof
  • Method for nondestructive measurement of refractive index of transparent capillary wall and device thereof

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Experimental program
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Effect test

Embodiment 1

[0040]A light-emitting diode 1 with a central wavelength of λ=580nm and a spectral line half-width FWHM=32nm is used as a measurement light source after being collimated by a lens 2, and the collimated light beam enters the capillary through a slit 3 with adjustable width. When measuring, the slit width SW of the slit 3 is about smaller than the inner diameter of the capillary to meet the paraxial condition of the optical system; the glass capillary 4 after inhaling the standard liquid constitutes a cylindrical lens optical system composed of four coaxial cylinders, and is arranged on the lens 2 and the microscopic objective lens 5; the magnification is 10 times, the microscopic objective lens 5 of numerical aperture A=0.25 is arranged on the receiving field of view, and the field diaphragm of the image acquisition system 7 matches the light spot of the capillary 4 focal points, And the image acquisition system 7 is fixed on a one-dimensional translation stage 9 with a minimum ...

Embodiment 2

[0043] When determining the capillary wall refractive index according to (1), the focal length d value of the capillary must be measured, d=D i -D 0 , where D 0 is the position of the axis of the capillary, which is usually determined by measuring the position of the clear image of the outer contour of the capillary. Due to the diffraction effect when parallel light passes through the edge of the outer wall of the capillary, the position of the clear image of the outer contour of the capillary can be accurately judged D 0 is difficult, resulting in a measurement error in the d value.

Embodiment 3

[0045] Apply formulas (4) and (5), that is, use the standard liquid refractive index calibration method, and at the same time, apply formula (6) to calculate D 0 value, avoiding the need for D 0 The direct measurement of the value eliminates the need for D 0 The measurement error of the refractive index of the capillary tube wall is caused by the measurement error of the value.

[0046] According to the device and the method provided in the above embodiments, the present invention adopts three kinds of standard liquids (pure water n 1 = 1.3335, ethanol n 2 = 1.3618, ethylene glycol n 3 =1.4331) to calibrate the refractive index of the capillary. The refractive index of the liquid sample was measured with a 2WA-J Abbe refractometer, and the measurement error of the refractive index was 0.0002 (2WA-J Abbe refractometer instruction manual, produced by Shanghai Optical Instrument Fifth Factory).

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Abstract

The invention relates to a method for the nondestructive measurement of the refractive index of a transparent capillary wall and a device thereof, belonging to a method for measuring the refractive index of solid by taking visible light as a light source. By utilizing the principle that parallel light has different convergence focus positions after passing through capillaries filled with liquid with different standards, the invention can be used for judging the image formed after the image formation of the convergence focus position by a CCD, calculating the outline position and focal distance of the capillary and further figuring out the refractive index of the capillary wall. The invention has the accuracy in the measurement of the refractive index of the capillary of being superior to 0.005, and has the characteristics of simple equipment, convenient operation and image observation, clear identification and high automation degree; furthermore, the invention realizes the accurate measurement for the refractive index of the capillary wall under the nondestructive condition, thus meeting the requirement for the accuracy of the refractive index of the capillary wall in the common experiment process.

Description

technical field [0001] The invention belongs to a method for measuring the refractive index of a solid by using visible light as a light source, in particular to a method and a device for measuring the refractive index of a capillary tube wall. Background technique [0002] Glass capillary is widely used in medical testing, optical instruments, analytical instruments, optical fiber communication accessories, testing, laboratory testing and other industries. It is one of the important components in many testing and testing instruments (http: / / www.glassinfo.com.cn / , Glass Information Network [OL]). In scientific research, it is often necessary to accurately know the refractive index of the capillary wall. Since manufacturers generally do not provide or only provide relevant data for batch products, it is necessary to accurately measure the actual capillary wall refractive index in the scientific research process. According to the current literature reports, there is no metho...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 普小云李强苏光辉张瑞凯孙丽存
Owner YUNNAN UNIV
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