Sandwich liquid core waveguide structure investigating pond

A liquid core waveguide and structure detection technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., to achieve the effect of improving signal-to-noise ratio and reducing strength

Inactive Publication Date: 2007-07-18
INST OF CHEM CHINESE ACAD OF SCI
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However, expensive lasers an

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  • Sandwich liquid core waveguide structure investigating pond

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Embodiment 1

[0034] The sandwich-type liquid core waveguide structure detection cell shown in Figure 1 is mainly composed of liquid core optical fiber, flow cell body, tee joint, ordinary optical fiber and other parts.

[0035] The liquid-core optical fiber 1 is a Teflon AF2400 capillary tube with an outer diameter of 792 μm, an inner diameter of 193 μm, and a length of 18 cm, and is installed in the center of the flow cell body 2; the flow cell body 2 is a stainless steel tube with an outer diameter of 30 mm, an inner diameter of 27 mm, and a length of 160 mm. There are five rows of light source holes in the axial direction, 20 in each row, 100 in total, and each light source hole is equipped with a light-emitting diode 3 with a center wavelength of 470nm; the light-emitting diodes in each row are connected in parallel and powered by a DC stabilized power supply. The voltage is 3.2V, and the working current is 20mA-30mA; the five columns of light-emitting diodes can be controlled separatel...

Embodiment 2

[0039] Use the device shown in embodiment 1, start HPLC infusion system, take fluorescein as sample, methanol is solvent, is made into 10 -6 -10 -9 mol / L fluorescein solution, inject the fluorescein solution into the HPLC system through the injection valve, and detect with the instrument and device described in Example 1, with an injection volume of 10 μl. Figure 2 shows a typical chromatogram. Samples with the same concentration were injected 3 times, and the arithmetic mean value was calculated, and the linear range obtained was: 6.02×10 -9 mol / L-3.01×10 -7 mol / (R 2 = 0.997). It can be seen from the calculation that when the signal-to-noise ratio is 3, the minimum detection concentration of the device for fluorescein is 3.95×10 -10 mol / L.

[0040] Chromatography and detection conditions: PMT working voltage is -730V; mobile phase: methanol; flow rate: 1.0ml / min;

[0041] Fluorescein concentration: 3.01 x 10 -8 mol / L; injection volume: 10μL; LEDs: 100, working voltage...

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Abstract

The invention relates to sandwich type liquid core wave guide structure detecting pool. It is made up of liquid core optical fiber, circulating pool body, duplex fitting, common optical fiber. The center of the circulating pool body is traversed by one liquid core optical fiber. Its two sides are set liquid inlet and outlet. Its pool wall is set light source hole. And its two ends are respectively connected with one duplex fitting. One of them has circulating pool inlet. And another has outlet to connect with outer separating and analyzing system. The refraction index of the injected liquid is more than 1.31 of the liquid core wave guide to form thick-thin-thick sandwich type structure in the circulating pool that means forming a layer of liquid wall structure with full internal reflection ability at the outer side of the liquid core optical fiber which can prevent side emitting light from entering its inner to reduce scattered light strength, increase detecting signal to noise ratio.

Description

technical field [0001] The invention belongs to the design and development category of analytical instruments, and in particular relates to a liquid core waveguide (LCW)-based detection cell with a sandwich type liquid core waveguide structure. Background technique [0002] Liquid Core Waveguide (LCW), also known as liquid core fiber. It refers to the phenomenon that when the refractive index of the peripheral material is lower than that of the liquid core, the light wave input from one end of the liquid core will produce total internal reflection at the interface between the liquid core and the tube wall, and can be transmitted from the other end with almost no loss. . [0003] The research on LCW first began in the middle of the 19th century. Colladon, Babinet, Tyndall and others studied the phenomenon of light propagating in stream water through total internal reflection. By the end of the 19th century, the phenomenon was widely known for its application in illuminated ...

Claims

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Application Information

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IPC IPC(8): G01N21/03
Inventor 刘国诠毛建军赵睿上官棣华
Owner INST OF CHEM CHINESE ACAD OF SCI
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