Liquid-core waveguide Raman spectrum detection device based on centrifuging

Abstract

The invention provides a liquid-core waveguide Raman spectrum detection device based on centrifuging. The liquid-core waveguide Raman spectrum detection device comprises a bracket, a multi-head spiral disc body and a light source probe translation stage, wherein the bracket is provided with a motor; the multi-head spiral disc body is fixed on the bracket and can horizontally rotate around a vertical rotary shaft of the motor; the multi-head spiral disc body comprises a disc head and a circular platform located below the disc head; the disc head is provided with a plurality of through holes; a positioning groove is formed in the upper part of each through hole; spiral channels, which have the quantity the same as that of the through holes, are opposite to the through holes, and are used for containing liquid-core waveguide tubes, are arranged on a side wall of the circular platform; the spiral channels are spirally diffused from top to bottom; the light source probe translation stage is fixed on the bracket, is located above the multi-head spiral disc body, and comprises a light source probe capable of moving linearly and a positioning mechanism matched with the positioning grooves; the positioning mechanism is located at the front end of the light source probe, can move forward along with the light source probe, and abuts against the positioning grooves.

Description

technical field [0001] The invention relates to a spectrum testing device, in particular to a device for obtaining a liquid-core waveguide with sufficient optical path and no bubbles by using a centrifugal method and performing Raman spectrum detection. Background technique [0002] Teflon AF has a lower refractive index than water, so when a pipe made of Teflon AF is filled with water or an aqueous solution, the interface between water and Teflon AF can meet the conditions of total reflection, and conduct light incident at a certain angle like an optical fiber. capability to form so-called liquid-core waveguides. Because the liquid core waveguide has a strong light guiding ability, a longer optical path can be obtained in it, so as to realize the sensitization of various optical detection technologies based on the principles of emission, absorption, fluorescence, and scattering, which is very good. Application prospect. [0003] For example, it can be used in the field of...

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Problems solved by technology

[0005] There are two ways to eliminate the bubbles in the tube. One is to use the centrifugal method, let the liquid core waveguide rotate around the axis, and use the increase in the buoyancy of the bubbles under the centrifugal condition of the liquid to achieve the removal of the bubbles. However, with the increase of the centrifugal force, The bubbles in the tube are rapidly increased by the pressure of the solution, the volume is continuously compressed, and the increase in buoyancy is not obvious. Coupled with the obstruction of the space, it is difficult to remove all the bubbles; another method is to use vacuum degassing method, such as the application number 201310415459.3 The Chinese invention patent proposes the use of negative pressure sampling to eliminate the air bubbles in the liquid core waveguide while feeding the liquid, but each liquid core waveguide needs to be equipped with a vacuum pump and several solenoid valves, which are controlled by a certain program , high cost and complex control

[0006] Because it is not easy to remove the air bubbles in the liquid core waveguide, traditional Raman spectroscopy detection devices do not have this function. In the past, the liquid core waveguide without air bubbles was pre-prepared, including sample injection, and the air bubbles were removed by the above method. It is very troublesome to check whether the bubbles are removed and ensure that the liquid core waveguide has no bubbles before taking it to the Raman test device for testing. Moreover, the liquid core waveguide obtained by the traditional method has a short optical path, and it is difficult to perform Raman spectroscopy. Poor performance when testing

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