CN101701905B - Wide-aperture long path sample pool - Google Patents
Wide-aperture long path sample pool Download PDFInfo
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- CN101701905B CN101701905B CN2009101936249A CN200910193624A CN101701905B CN 101701905 B CN101701905 B CN 101701905B CN 2009101936249 A CN2009101936249 A CN 2009101936249A CN 200910193624 A CN200910193624 A CN 200910193624A CN 101701905 B CN101701905 B CN 101701905B
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Abstract
The invention discloses a wide-aperture long path sample pool, comprising two quartz fibers, two optical liquid couplers, a liquid core wave-guide and two sample introduction pipes, wherein the first quartz fiber is connected with the first tie-in of the first optical liquid coupler; the first pipe is connected to the second tie-in of the first optical liquid coupler; the third tie-in of the first optical liquid coupler is connected with one end of the liquid core wave-guide; the other end of the liquid core wave-guide is connected with the third tie-in of the second optical liquid coupler; the second pipe is connected with the second tie-in of the second optical liquid coupler and the second quartz fiber is connected with the first tie-in of the second optical liquid coupler. The inner diameter of the liquid core wave-guide r1 is more than or equal to 800 microns but less than or equal to 2000 microns. The inner diameter of the pipes r2 is more than or equal to 0.8mm but less than or equal to 2.0mm. The fiber diameter of the quartz fiber d is more than or equal to 400 microns but less than or equal to 1000 microns. The optical signal from the quartz fiber and the solution from the pipe are coupled by the optical liquid coupler. The invention meets the demand of analysis and measurement of solution with macro-particle floating.
Description
Technical field
The present invention relates to a kind of wide-aperture long light path sample cell.
Background technology
The basic skills that adopts the liquid core waveguide system to carry out spectral investigation be with solution example to be measured according to certain flow velocity with the dynamic flow mode pump into a diameter be 50 to hundreds of microns, length 1 to several meters micro wave guide pipe.After incident laser enters waveguide, because the refractive index of the refractive index ratio fluid sample of waveguide material is little, make laser on liquid and waveguide interface, to produce inner full-reflection, excite luminous energy in liquid core waveguide through repeatedly the reflection and can be from the wave guide wall transmission, so the luminous energy that excites that enters in the waveguide transmits forward along waveguide always, until other end output from waveguide.The detection cell that uses in traditional photometric method, length only is 1cm, 5cm or 10cm, therefore, liquid core waveguide pipe is applied in the spectral investigation as detection cell, the demand of testing sample is very little, and can obtain long especially effective light path, effective light path of this speciality can significantly improve spectral signal intensity and detection limit.In the ideal case, detection sensitivity is proportional with the length of effective light path, thereby can make the sensitivity of optical detecting methods such as Raman spectrum, fluorescence spectrum be greatly enhanced.
How the good long light path water sample detection pond of design performance is the focal issue that the instrumental analysis field is paid close attention to, and especially is embodied in the trace analysis field of water sample.
1989, E.I.Du Pont Company has released a kind of amorphous perfluoro-2,2-dimethyl-1,3-dioxole and polytetrafluoroethyl-ne alkene copolymer, be called Teflon AF (two kinds are arranged at present, and refractive index is that 1.31 Teflon AF1600 and refractive index are 1.29 Teflon AF2400).This invention provides possibility for the detection cell that designs long light path.Hollow kapillary so that Teflon AF makes is also referred to as liquid core waveguide pipe, and two kinds of models are arranged at present, is called a type liquid core waveguide and two type liquid core waveguides.For a type liquid core waveguide, the i.e. hollow kapillary of making by Teflon AF2400, when being full of aqueous solution in the pipe, because the refractive index of Teflon AF2400 is less than the refractive index (about 1.33) of water, light is from an end incident, incident light in certain solid angle can be in the interface generation total reflection of Teflon AF2400 kapillary and water, propagates thereby light is strapped in the kapillary, sees accompanying drawing 1 (a); For two type liquid core waveguides, promptly outside quartz capillary, plate the kapillary of one deck TeflonAF2400 material, when being full of aqueous solution in the pipe, light is from an end incident, incident light in certain solid angle can be in the interface generation total reflection of Teflon AF2400 coating and quartz capillary, thereby light is strapped in the kapillary propagates, see accompanying drawing 1 (b).No matter a type liquid core waveguide or two type liquid core waveguides all can be strapped in light in the kapillary and propagate, and utilize this characteristic in a word, just can design the detection cell of long light path.
The present long light path detection cell of making based on liquid core waveguide pipe, though increased substantially the detection light path, but because the aperture of liquid core waveguide pipe less (about hundreds of micron) own, and making causes the long light path sample cell of this class all to have sample introduction aperture problem of smaller with the limitation of light liquid coupling scheme.Representative products is WPI (World Precision Instruments at present, Inc.) the long light path sample cell of LWCC (Liquid-waveguidecapillary flow cell) of company's design, it is 550 microns two type liquid core waveguide pipe design based on internal diameter, because the limitation of institute making usefulness light liquid coupling scheme, the sample introduction aperture of its nominal only is 20 microns, that is to say, it is after 20 microns filtrator filters that the solution of required measurement has only through the aperture, just can enter the long light path detection cell of LWCC and measure, otherwise just may stop up the long light path detection cell of LWCC.Accompanying drawing 2 is depicted as the light liquid coupling principle figure of the long light path detection cell of LWCC, comprising optical fiber 8, and liquid core waveguide 9, silicone tube 10.As seen, the present long light path sample cell based on liquid core waveguide because its sample introduction aperture is too small, can't satisfy the analysis to measure demand of the solution that is suspended with macroparticle at all.
Summary of the invention
At the shortcoming of prior art, the purpose of this invention is to provide a kind of wide-aperture long light path sample cell that satisfies the analysis to measure demand of the solution that is suspended with macroparticle.
For achieving the above object, technical scheme of the present invention is: a kind of wide-aperture long light path sample cell, it comprises two quartzy optical fiber, two light liquid coupling mechanisms,, liquid core waveguide pipe and two sample introduction water pipes, first silica fibre is connected to first joint of the first smooth liquid coupling mechanism, first water pipe is connected to second joint of the first smooth liquid coupling mechanism, the 3rd joint of the first smooth liquid coupling mechanism connects an end of liquid core waveguide pipe, the other end of liquid core waveguide pipe connects the 3rd joint of the second smooth liquid coupling mechanism, second water pipe is connected to second joint of the second smooth liquid coupling mechanism, second silica fibre is connected to first joint of the second smooth liquid coupling mechanism, wherein, the internal diameter 800 μ m≤r1≤2000 μ m of liquid core waveguide pipe, first, the internal diameter of second water pipe is 0.8mm≤r2≤2.0mm, first, the core diameter 400 μ m≤d≤1000 μ m of second silica fibre, light liquid coupling mechanism will be coupled from the light signal of silica fibre and solution from water pipe.
First joint of this first, second light liquid coupling mechanism is coaxial with the 3rd joint, and second joint and first, the 3rd joint axis are to vertical.
Be equipped with the O RunddichtringO that is used for water-stop in first, second each joint of light liquid coupling mechanism.
The length 3cm of liquid core waveguide pipe≤L≤500cm.
First, second silica fibre is inserted in first joint of first, second light liquid coupling mechanism by a ceramic contact pin respectively, and the distance between ceramic contact pin front end face and the liquid core waveguide pipe front end face is adjustable in the scope of 20-1000 micron.
Each joint of this light liquid coupling mechanism constitutes for the hollow fixed screw.
Compared with prior art, the present invention has following advantage: the present invention significantly improves the sample introduction aperture of long light path detection cell, containing particle diameter can be without filtration less than the solution of 950 microns suspended particles, directly enter detection cell of the present invention and detect, satisfy the analysis to measure demand of the solution that is suspended with macroparticle.
Description of drawings
Fig. 1 (a) is a type liquid core waveguide pipe structural representation;
Fig. 1 (b) is two type liquid core waveguide pipe structural representations;
Fig. 2 is the light liquid coupling principle figure of the long light path detection cell of LWCC;
Fig. 3 is the installation schematic diagram of example of the present invention;
Fig. 4 (a) is the schematic diagram of the light liquid coupling mechanism of example of the present invention;
Fig. 4 (b) is the enlarged diagram of A part among Fig. 4 (a).
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail.
As shown in Figure 3, a kind of wide-aperture long light path sample cell, it comprises two quartzy optical fiber, two light liquid coupling mechanisms,, liquid core waveguide pipe and two sample introduction water pipes, first silica fibre 1 is connected to first joint 21 of the first smooth liquid coupling mechanism 2, first water pipe 6 is connected to second joint 22 of the first smooth liquid coupling mechanism 2, the 3rd joint 23 of the first smooth liquid coupling mechanism 2 connects an end of liquid core waveguide pipe 3, the other end of liquid core waveguide pipe 3 connects the 3rd joint 43 of the second smooth liquid coupling mechanism 4, second water pipe 7 is connected to second joint 42 of the second smooth liquid coupling mechanism 4, second silica fibre 5 is connected to first joint 41 of the second smooth liquid coupling mechanism 4, wherein, the internal diameter 800 μ m≤r1≤2000 μ m of core waveguide, first, the internal diameter of second water pipe is 0.8mm≤r2≤2.0mm, first, the core diameter 400 μ m≤d≤1000 μ m of second silica fibre, light liquid coupling mechanism will be coupled from the light signal of silica fibre and solution from water pipe.
The first smooth liquid coupling mechanism 2 will be coupled from the light signal of first silica fibre 1 and sample introduction solution from first water pipe 6, sample introduction solution enters liquid core waveguide pipe 3, light signal exports spectrometer through after the transmission of liquid core waveguide pipe 3 to from second silica fibre 5, and sample introduction solution is from 7 outputs of second water pipe.
Structure of the present invention is a symmetrical structure, and light signal can enter from first or second silica fibre, and sample introduction solution also can enter from first or second water pipe.
Shown in Fig. 4 a, 4b, first joint of this first, second light liquid coupling mechanism is coaxial with the 3rd joint, and second joint and first, the 3rd joint axis are to vertical.
Be equipped with the O RunddichtringO that is used for water-stop in first, second each joint of light liquid coupling mechanism.
The length 3cm of liquid core waveguide pipe 3≤L≤500cm.
First, second silica fibre 1,5 is inserted in first joint of first, second light liquid coupling mechanism by a ceramic contact pin 11 respectively, and the distance between ceramic contact pin 11 front end faces and the liquid core waveguide pipe front end face is adjustable in the scope of 20-1000 micron.
Each joint of this light liquid coupling mechanism 2,4 constitutes for the hollow fixed screw.
In the present embodiment, silica fibre 1,5 all adopts length 1m, and core diameter is 600 microns, ceramic contact pin, the silica fibre of joint SMA905; Liquid core waveguide pipe 3 adopts a type liquid core waveguide pipe, and internal diameter is 1000 microns, and external diameter is 1200 microns, and length is 30 centimetres; First, second water pipe 6,7 adopts the silica gel hard tube of 1mm internal diameter 1.5mm external diameter; After the connection, the distance adjustment between the ceramic contact pin front end face of silica fibre and liquid core waveguide pipe 3 front end faces is 1000 microns.
Claims (5)
1. wide-aperture long light path sample cell, it is characterized in that, comprise two quartzy optical fiber, two light liquid coupling mechanisms,, liquid core waveguide pipe and two sample introduction water pipes, first silica fibre (1) is connected to first joint (21) of the first smooth liquid coupling mechanism (2), first water pipe (6) is connected to second joint (22) of the first smooth liquid coupling mechanism (2), the 3rd joint (23) of the first smooth liquid coupling mechanism (2) connects an end of liquid core waveguide pipe (3), the other end of liquid core waveguide pipe (3) connects the 3rd joint of the second smooth liquid coupling mechanism (4), second water pipe (7) is connected to second joint of the second smooth liquid coupling mechanism (4), second silica fibre (5) is connected to first joint of the second smooth liquid coupling mechanism (4), wherein, the internal diameter 800 μ m≤rl≤2000 μ m of liquid core waveguide pipe (3), first, second water pipe (6,7) internal diameter is 0.8mm≤r2≤2.0mm, first, second silica fibre (1,5) core diameter 400 μ m≤d≤1000 μ m, light liquid coupling mechanism (2,4) will be from silica fibre (1,5) light signal with from water pipe (6,7) solution is coupled;
First, second silica fibre (1,5) is inserted in first joint of first, second light liquid coupling mechanism (2,4) by a ceramic contact pin (11) respectively, and the distance between ceramic contact pin (11) front end face and liquid core waveguide pipe (3) front end face is adjustable in the scope of 20-1000 micron.
2. wide-aperture long light path sample cell according to claim 1, it is characterized in that: first joint of this first, second light liquid coupling mechanism is coaxial with the 3rd joint, and second joint and first, the 3rd joint axis are to vertical.
3. wide-aperture long light path sample cell according to claim 2 is characterized in that: be equipped with the O RunddichtringO that is used for water-stop in first, second each joint of light liquid coupling mechanism (2,4).
4. wide-aperture long light path sample cell according to claim 2 is characterized in that: the length 3cm≤L≤500cm of liquid core waveguide pipe (3).
5. wide-aperture long light path sample cell according to claim 1 is characterized in that: each joint of this light liquid coupling mechanism (2,4) constitutes for the hollow fixed screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009101936249A CN101701905B (en) | 2009-11-03 | 2009-11-03 | Wide-aperture long path sample pool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101936249A CN101701905B (en) | 2009-11-03 | 2009-11-03 | Wide-aperture long path sample pool |
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| CN101701905A CN101701905A (en) | 2010-05-05 |
| CN101701905B true CN101701905B (en) | 2011-12-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102478498A (en) * | 2011-04-22 | 2012-05-30 | 吴守清 | Super-long cuvette system for color comparator |
| CN103630973B (en) * | 2013-12-17 | 2015-08-05 | 哈尔滨理工大学 | The method for making of liquid-core optical fibre and silica fibre coupling device |
| CN106198413A (en) * | 2016-06-16 | 2016-12-07 | 陕西师范大学 | Linear amplification absorption spectrum based on Teflon absorption tube detection device and method |
| CN108169211A (en) * | 2018-02-12 | 2018-06-15 | 上海出入境检验检疫局动植物与食品检验检疫技术中心 | A kind of Raman spectrum enhances measuring system |
| CN109239052B (en) * | 2018-10-29 | 2020-10-16 | 中国科学院上海技术物理研究所 | Astronaut urine detection method based on liquid core waveguide Raman spectrum |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0909946A2 (en) * | 1997-10-16 | 1999-04-21 | World Precision Instruments, Inc. | Chemical sensing techniques employing liquid-core optical fibers |
| CN1312467A (en) * | 2001-04-27 | 2001-09-12 | 吉林大学 | Oil measurer with multiple wavelenglth optical filter array detector |
| CN101000299A (en) * | 2006-01-11 | 2007-07-18 | 中国科学院化学研究所 | Sandwich liquid core waveguide structure investigating pond |
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2009
- 2009-11-03 CN CN2009101936249A patent/CN101701905B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0909946A2 (en) * | 1997-10-16 | 1999-04-21 | World Precision Instruments, Inc. | Chemical sensing techniques employing liquid-core optical fibers |
| CN1312467A (en) * | 2001-04-27 | 2001-09-12 | 吉林大学 | Oil measurer with multiple wavelenglth optical filter array detector |
| CN101000299A (en) * | 2006-01-11 | 2007-07-18 | 中国科学院化学研究所 | Sandwich liquid core waveguide structure investigating pond |
Non-Patent Citations (2)
| Title |
|---|
| 孙兆华等.基于长光程技术的痕量海水营养盐自动分析仪的设计与测试.《光谱学与光谱分析》.2008,第28卷(第12期),3000-3003. * |
| 樊颖锋等.基于液芯光纤的激光诱导荧光检测装置的研制及应用.《分析试验室》.2008,第27卷(第5期),118-122. * |
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