CN110346328A - A kind of device using grating fibers measurement liquid refractivity - Google Patents
A kind of device using grating fibers measurement liquid refractivity Download PDFInfo
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- CN110346328A CN110346328A CN201910783030.7A CN201910783030A CN110346328A CN 110346328 A CN110346328 A CN 110346328A CN 201910783030 A CN201910783030 A CN 201910783030A CN 110346328 A CN110346328 A CN 110346328A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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Abstract
The present invention relates to a kind of devices using grating fibers measurement liquid refractivity, including the first adjacent cavity, the second cavity；It is provided with the first grating fibers in first cavity, is provided with the second grating fibers in second cavity；It is provided with the first optical fiber outside first cavity, the second optical fiber is provided with outside second cavity；One end of first optical fiber is connect with one end of the first grating fibers, and the other end of the first grating fibers is connect with one end of the second grating fibers, and the other end of the second grating fibers is connect with one end of the second optical fiber；This measures the device of liquid refractivity using grating fibers, by the way that normal fluid and testing liquid are arranged in two cavitys, successively pass through normal fluid and testing liquid using same light source, generate the feature transmission paddy of two different locations, to obtain the refractive index of testing liquid, this is simple using the apparatus structure that grating fibers measure liquid refractivity, and only with a light source, it is high to measure liquid refractivity accuracy rate.
Description
Technical field
The present invention relates to the technical fields of measuring refractive indexes of liquid, and in particular to a kind of application grating fibers measurement liquid folding
Penetrate the device of rate.
Background technique
Refractive index is as one of most important optical parameter of liquid, and in concentration, Purity, medicine, the fields such as chemical industry are all
With important application.With the development of modern science and technology, new material is constantly succeeded in developing, the measurement accuracy and measurement of refractive index
Range made higher requirement.Refractometry technology is based primarily upon the law of refraction and interferometry two major classes at present.It is based on
The measurement method of refraction theorem includes minimum horn cupping less than normal, V prism method, total reflection method etc., and wherein the method for minimum deviation angle precision is most
Height, principle are to obtain refractive index from the minimum deviation after prism outgoing by measurement light, and precision can achieve current refraction
It is 10 that rate, which measures national standard,-6；But this method needs for sample to be tested to be processed into accurate prism, difficulty is larger and not applicable
In measuring refractive indexes of liquid.V prism method and total reflection method pass through the critical of the deflection angle or total reflection for measuring emergent ray respectively
Angle obtains refractive index size, and sample to be tested can be solid and liquid, and application is relatively broad.But it is constrained to measurement mechanism, both
The testable ranges of indices of refraction of method is only 1.3-1.7, is unable to satisfy the growth requirement of big refractive index new material.
The variation for measuring light path nL and geometrical length L simultaneously using interferometer, obtains the size of refractive index n according to its ratio
It is the basic ideas of interferometry.It is that liquid is immersed in by Michelson's interferometer record for liquid refractivity, in existing literature
The change in optical path length of mirror in body, and the displacement of mirror is obtained by electric pulse mode, to obtain the refractive index of liquid.Mirror
Change in displacement and change in optical path length rely on electrical method and optical means to obtain respectively, therefore precision is lower, and measurement result can not
It traces to the source.The it is proposeds such as Xu Ling pass through the road Liang Gezhungong formula laser feedback interferometer, while using liquid bottom and liquid surface outside
Portion's reflecting surface, the change in optical path length of bottom and apparent height variation when measurement liquid level increases, and liquid folding is obtained under a proportional relationship
Penetrate the size of rate.Though this method precision is high, it is big that optical path complexity tunes difficulty, and due to using two-way interferometer, two
The wavelength of a light source is not exclusively synchronous, needs to improve there are also technology from can really trace to the source measurement.
Summary of the invention
The object of the present invention is to provide a kind of devices using grating fibers measurement liquid refractivity, including adjacent first
Cavity, the second cavity；It is provided with the first grating fibers in first cavity, the second grating light is provided in second cavity
It is fine；It is provided with the first optical fiber outside first cavity, the second optical fiber is provided with outside second cavity；The one of first optical fiber
End is connect with one end of the first grating fibers, and the other end of the first grating fibers is connect with one end of the second grating fibers, and second
The other end of grating fibers is connect with one end of the second optical fiber.
First grating fibers are set to middle part in the first cavity；During second grating fibers are set in the second cavity
Portion.
Second cavity is set to the top of the first cavity.
The first grating fibers, third grating fibers are provided in first cavity；Is provided in second cavity
Two grating fibers；It is provided with the first optical fiber outside first cavity, the second optical fiber is provided with outside second cavity；Described first
One end of optical fiber is connect with one end of the first grating fibers, and one end of the other end of the first grating fibers and the second grating fibers connects
It connects, the other end of the second grating fibers is connect with one end of third grating fibers；The other end of third grating fibers and the second light
Fine one end connection.
Second cavity is set to the inside of the first cavity.
The first grating fibers, third grating fibers are provided in first cavity；Is provided in second cavity
Two grating fibers；It is provided with the first optical fiber outside first cavity, the second optical fiber is provided with outside second cavity；Described first
One end of optical fiber is connect with one end of the first grating fibers, and one end of the other end of the first grating fibers and the second grating fibers connects
It connects, the other end of the second grating fibers is connect with one end of third grating fibers；The other end of third grating fibers and the second light
Fine one end connection.
Beneficial effects of the present invention: this device using grating fibers measurement liquid refractivity provided by the invention leads to
It crosses and normal fluid and testing liquid is set in two cavitys, successively pass through normal fluid and testing liquid using same light source,
The feature transmission paddy of two different locations is generated, to obtain the refractive index of testing liquid, this measures liquid using grating fibers
The apparatus structure of refractive index is simple, and only with a light source, it is high to measure liquid refractivity accuracy rate.
The present invention is described in further details below with reference to attached drawing.
Detailed description of the invention
Fig. 1 is the schematic device one using grating fibers measurement liquid refractivity.
Fig. 2 is the schematic device two using grating fibers measurement liquid refractivity.
Fig. 3 is the schematic device three using grating fibers measurement liquid refractivity.
Fig. 4 is the schematic device four using grating fibers measurement liquid refractivity.
In figure: 1, the first cavity；2, the second cavity；3, the first optical fiber；4, the second optical fiber；5, the first grating fibers；6,
Two grating fibers；7, third grating fibers.
Specific embodiment
Reach the technical means and efficacy that predetermined purpose is taken for the present invention is further explained, below in conjunction with attached drawing and reality
Example is applied to a specific embodiment of the invention, structure feature and its effect, detailed description are as follows.
Embodiment 1
A kind of device such as Fig. 1 application grating fibers measurement liquid refractivity is present embodiments provided, including the first adjacent chamber
Body 1, the second cavity 2；It is provided with the first grating fibers 5 in first cavity 1, is provided with the second light in second cavity 2
Grid optical fiber 6；It is provided with the first optical fiber 3 outside first cavity 1, is provided with the second optical fiber 4 outside second cavity 2；Described
One end of one optical fiber 3 is connect with one end of the first grating fibers 5, the other end of the first grating fibers 5 and the second grating fibers 6
One end connection, the other end of the second grating fibers 6 are connect with one end of the second optical fiber 4；In this way, the incident light that light source issues can
To inject from the first optical fiber 3, the first cavity 1, the second cavity 2 are passed sequentially through, finally, projecting from the second optical fiber 4；It is practical to carry out liquid
When body refractometry, the normal fluid that known refractive index is n is injected in the first cavity 1, and the first grating fibers 5 do not have
Enter in normal fluid, testing liquid injected in the second cavity 2, and the second grating fibers 6 submerge in titer testing liquid,
Then the light projected from the second optical fiber 4 carries out transmitted spectrum measurement, and normal fluid and testing liquid are had in transmitted spectrum
Generated two transmissions paddy, two wavelength differences transmitted between paddy, the as refringence of normal fluid and testing liquid, this
Sample can calculate the refractive index of testing liquid according to the refractive index n of normal fluid.
The explanation needed, the first grating fibers 5 are not contacted with the inner wall of the first cavity 1, the second grating fibers 6 not with
The inner wall of second cavity 2 contacts, this way it is possible to avoid the inner wall of the inner wall of the first cavity 1 or the second cavity 2 is to testing liquid
The measurement of refractive index impact；As shown in Fig. 2, first grating fibers 5 are set to middle part in the first cavity 1；Second
Grating fibers 6 are set to middle part in the second cavity 2.
Further, it is insulation material that first optical fiber 3, which passes through the first cavity 1 and the cavity of 1 contact position of the first cavity,
Material, it is insulating materials that second optical fiber 4, which passes through the second cavity 2 and the cavity of 2 contact position of the second cavity, in this way, can prevent
First cavity 1, the second cavity 2 absorb the energy in optical fiber, impact to the detection of liquid refractivity to be measured.
Embodiment 2
A kind of device such as Fig. 3 application grating fibers measurement liquid refractivity is present embodiments provided, including the first adjacent chamber
Body 1, the second cavity 2, and the second cavity 2 is set to the top of the first cavity 1, the first cavity 1, the second chamber in the present embodiment
Body 2 can be circular cylindrical cavity；The first grating fibers 5, the third grating of multi-turn rotation respectively are provided in first cavity 1
Optical fiber 7；The second grating fibers 6 of multi-turn rotation are provided in second cavity 2；First is provided with outside first cavity 1
Optical fiber 3, second cavity 2 are provided with the second optical fiber 4 outside；One end of one end of first optical fiber 3 and the first grating fibers 5
Connection, the other end of the first grating fibers 5 connect with one end of the second grating fibers 6, the other end of the second grating fibers 6 and the
One end of three grating fibers 7 connects；The other end of third grating fibers 7 is connect with one end of the second optical fiber 4；In this way, light source is sent out
Incident light out can be injected from the first optical fiber 3, pass sequentially through the first cavity 1, the second cavity 2, the first cavity 1, finally, from
Second optical fiber 4 projects；When practical progress measuring refractive indexes of liquid, the standard that known refractive index is n is injected in the first cavity 1
Liquid, and the first grating fibers 5 submerge in normal fluid, and testing liquid, and the second grating light are injected in the second cavity 2
Fibre 6 submerges in titer testing liquid, and the light then projected from the second optical fiber 4 carries out transmitted spectrum measurement, in transmitted spectrum
Have two transmission paddy caused by normal fluid and testing liquid, the wavelength difference between two transmission paddy, as titer
The refringence of body and testing liquid can thus calculate the refractive index of testing liquid according to the refractive index n of normal fluid.
The explanation needed, the first grating fibers 5 are not contacted with the inner wall of the first cavity 1, the second grating fibers 6 not with
The inner wall of second cavity 2 contacts, this way it is possible to avoid the inner wall of the inner wall of the first cavity 1 or the second cavity 2 is to testing liquid
The measurement of refractive index impact；As shown in Fig. 2, first grating fibers 5 are set to middle part in the first cavity 1；Second
Grating fibers 6 are set to middle part in the second cavity 2.
There are also a bit, it is exactly that normal fluid can be air, thus only needs to inject prepare liquid in the second cavity 2,
The refractometry of testing liquid can equally be carried out.
Further, it is insulation material that first optical fiber 3, which passes through the first cavity 1 and the cavity of 1 contact position of the first cavity,
Material, it is insulating materials that second optical fiber 4, which passes through the second cavity 2 and the cavity of 2 contact position of the second cavity, in this way, can prevent
First cavity 1, the second cavity 2 absorb the energy in optical fiber, impact to the detection of liquid refractivity to be measured.
Embodiment 3
A kind of device such as Fig. 4 application grating fibers measurement liquid refractivity is present embodiments provided, including the first adjacent chamber
Body 1, the second cavity 2, and the second cavity 2 is set to the top of the first cavity 1, the first cavity 1, the second chamber in the present embodiment
Body 2 is hollow circular cylindrical cavity, also, second cavity 2 is set to the inside of the first cavity 1.In first cavity 1
It is provided with the first grating fibers 5, the third grating fibers 7 of multi-turn rotation respectively；Multi-turn rotation is provided in second cavity 2
The second grating fibers 6；It is provided with the first optical fiber 3 outside first cavity 1, is provided with the second optical fiber outside second cavity 2
4；One end of first optical fiber 3 is connect with one end of the first grating fibers 5, the other end and the second light of the first grating fibers 5
One end of grid optical fiber 6 connects, and the other end of the second grating fibers 6 is connect with one end of third grating fibers 7；Third grating fibers
7 other end is connect with one end of the second optical fiber 4；In this way, the incident light that light source issues can be injected from the first optical fiber 3, according to
It is secondary to pass through the first cavity 1, the second cavity 2, the first cavity 1, finally, being projected from the second optical fiber 4；It is practical to carry out liquid refractivity survey
When amount, the normal fluid that known refractive index is n is injected in the first cavity 1, and the first grating fibers 5 submerge normal fluid
In, testing liquid is injected in the second cavity 2, and the second grating fibers 6 submerge in titer testing liquid, then from second
The light that optical fiber 4 projects carries out transmitted spectrum measurement, is had two caused by normal fluid and testing liquid in transmitted spectrum
A transmission paddy, two wavelength differences transmitted between paddy, the as refringence of normal fluid and testing liquid, thus can root
The refractive index of testing liquid is calculated according to the refractive index n of normal fluid.
The explanation needed, the first grating fibers 5 are not contacted with the inner wall of the first cavity 1, the second grating fibers 6 not with
The inner wall of second cavity 2 contacts, this way it is possible to avoid the inner wall of the inner wall of the first cavity 1 or the second cavity 2 is to testing liquid
The measurement of refractive index impact；As shown in Fig. 2, first grating fibers 5 are set to middle part in the first cavity 1；Second
Grating fibers 6 are set to middle part in the second cavity 2.
There are also a bit, it is exactly that normal fluid can be air, thus only needs to inject prepare liquid in the second cavity 2,
The refractometry of testing liquid can equally be carried out.
Further, it is insulation material that first optical fiber 3, which passes through the first cavity 1 and the cavity of 1 contact position of the first cavity,
Material, it is insulating materials that second optical fiber 4, which passes through the second cavity 2 and the cavity of 2 contact position of the second cavity, in this way, can prevent
First cavity 1, the second cavity 2 absorb the energy in optical fiber, impact to the detection of liquid refractivity to be measured.
In conclusion the device using grating fibers measurement liquid refractivity, by the way that standard is arranged in two cavitys
Liquid and testing liquid successively pass through normal fluid and testing liquid using same light source, generate the feature of two different locations
Paddy is transmitted, to obtain the refractive index of testing liquid, this is simple using the apparatus structure that grating fibers measure liquid refractivity, only
Using a light source, it is high to measure liquid refractivity accuracy rate.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (6)
1. it is a kind of using grating fibers measurement liquid refractivity device, it is characterised in that: including adjacent the first cavity (1),
Second cavity (2)；It is provided with the first grating fibers (5) in first cavity (1), the is provided in second cavity (2)
Two grating fibers (6)；It is provided with the first optical fiber (3) outside first cavity (1), second is provided with outside second cavity (2)
Optical fiber (4)；One end of first optical fiber (3) is connect with one end of the first grating fibers (5), the first grating fibers (5) it is another
One end is connect with the one end of the second grating fibers (6), and the other end of the second grating fibers (6) and one end of the second optical fiber (4) connect
It connects.
2. a kind of device using grating fibers measurement liquid refractivity as described in claim 1, it is characterised in that: described the
One grating fibers (5) are set to middle part in the first cavity (1)；Second grating fibers (6) are set to middle part in the second cavity (2).
3. a kind of device using grating fibers measurement liquid refractivity as described in claim 1, it is characterised in that: described the
Two cavitys (2) are set to the top of the first cavity (1).
4. a kind of device using grating fibers measurement liquid refractivity as claimed in claim 3, it is characterised in that: described the
The first grating fibers (5), third grating fibers (7) are provided in one cavity (1)；Second is provided in second cavity (2)
Grating fibers (6)；It is provided with the first optical fiber (3) outside first cavity (1), the second light is provided with outside second cavity (2)
Fine (4)；One end of first optical fiber (3) is connect with one end of the first grating fibers (5), the first grating fibers (5) it is another
End is connect with one end of the second grating fibers (6), the other end of the second grating fibers (6) and the one end of third grating fibers (7)
Connection；The other end of third grating fibers (7) is connect with one end of the second optical fiber (4).
5. a kind of device using grating fibers measurement liquid refractivity as described in claim 1, it is characterised in that: described the
Two cavitys (2) are set to the inside of the first cavity (1).
6. a kind of device using grating fibers measurement liquid refractivity as claimed in claim 5, it is characterised in that: described the
The first grating fibers (5), third grating fibers (7) are provided in one cavity (1)；Second is provided in second cavity (2)
Grating fibers (6)；It is provided with the first optical fiber (3) outside first cavity (1), the second light is provided with outside second cavity (2)
Fine (4)；One end of first optical fiber (3) is connect with one end of the first grating fibers (5), the first grating fibers (5) it is another
End is connect with one end of the second grating fibers (6), the other end of the second grating fibers (6) and the one end of third grating fibers (7)
Connection；The other end of third grating fibers (7) is connect with one end of the second optical fiber (4).
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| CN201910783030.7A CN110346328A (en) | 2019-08-23 | 2019-08-23 | A kind of device using grating fibers measurement liquid refractivity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910783030.7A CN110346328A (en) | 2019-08-23 | 2019-08-23 | A kind of device using grating fibers measurement liquid refractivity |
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| CN201910783030.7A Withdrawn CN110346328A (en) | 2019-08-23 | 2019-08-23 | A kind of device using grating fibers measurement liquid refractivity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114674349A (en) * | 2022-03-14 | 2022-06-28 | 麒盛科技股份有限公司 | Monitoring device based on optical fiber microbend |
-
2019
- 2019-08-23 CN CN201910783030.7A patent/CN110346328A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114674349A (en) * | 2022-03-14 | 2022-06-28 | 麒盛科技股份有限公司 | Monitoring device based on optical fiber microbend |
| CN114674349B (en) * | 2022-03-14 | 2024-06-04 | 麒盛科技股份有限公司 | Monitoring device based on optical fiber microbending |
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