CN205982082U - Liquid refractometry system - Google Patents
Liquid refractometry system Download PDFInfo
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- CN205982082U CN205982082U CN201620498107.8U CN201620498107U CN205982082U CN 205982082 U CN205982082 U CN 205982082U CN 201620498107 U CN201620498107 U CN 201620498107U CN 205982082 U CN205982082 U CN 205982082U
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- collector lens
- prism
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- light source
- luminous flux
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Abstract
The embodiment of the utility model discloses liquid refractometry system, include: the light source, the prism, including the incident surface, with the volume of awaiting measuring fluid contact's first surface, second surface and emitting face, the light beam warp that the light source sent the incident surface incides in order to form the incident beam in the prism, the incident beam is in propagate in the prism and just be in at least some total reflection is in order to form first folded light beam on the first surface, first folded light beam is in propagate in the prism and just be in the reflection is in order to form the second folded light beam on the second surface, second folded light beam warp the emitting face outgoing, the luminous flux meter is used for measuring the luminous flux of second folded light beam, refracting index accounting device for the refracting index of await measuring liquid is calculated according to the corresponding relation of luminous flux and refracting index. Liquid refractometry system's cost has been reduced from this.
Description
Technical field
The utility model is related to field of measuring technique and in particular to a kind of measuring refractive indexes of liquid system.
Background technology
Refractive index is one of important optical parametric of liquid, will appreciate that the optical property of liquid, purity, dense by refractive index
The property such as degree and dispersion, other some parameters (as thermo-optical coeffecient) are also closely related with refractive index.Therefore, liquid refractivity
Measurement have important meaning in chemical industry, medicine, food, oil etc. field.
Cirtical angle of total reflection imaging method is a kind of measuring method of conventional liquid refractivity, is according to total reflection principle,
It is in the angle of emergence of critical angle light by measurement, calculate the refractive index of testing liquid.As shown in figure 1, one kind is typically complete
Reflect critical angle measuring system and include light source U1, prism U3, imageing sensorU2, during work, the light beam sending from light source U1 is worn
Cross the interface that lens U3 reaches fluid to be measured X and prism U3, become refraction light and reflected light, wherein, reflected light in this interfacial separation
Received by imageing sensor U2, generate shaded-image as shown in Figure 2.In this shaded-image, bright partly corresponds to tested
There is the light of total reflection in the interface of solution X and prism U3, dark partly correspondence does not occur the light being totally reflected, bright-dark cut
The then corresponding critical angle that total reflection occurs.Because the change of the refractive index of detected solution can lead to the critical angle of total reflection
Change, therefore passes through to measure the position of this bright-dark cut it is possible to obtain the cirtical angle of total reflection, thus obtaining fluid to be measured
Refractive index.
But, the position detection of bright-dark cut needs using CCD or cmos image measurement apparatus, relatively costly.
Utility model content
Therefore, the technical problems to be solved in the utility model is that existing measuring refractive indexes of liquid system needs to use
CCD or the position of cmos image measurement apparatus detection bright-dark cut, so that measuring system high cost.
For this reason, the utility model embodiment provides a kind of measuring refractive indexes of liquid system, including：Light source；Prism, including
First surface, second surface and exit facet that the plane of incidence is contacted with quantity of fluid to be measured, the light beam that described light source sends through described enter
The face of penetrating is incided in described prism to form incident beam, and described incident beam is propagated and in described first table in described prism
At least partly it is totally reflected to form the first the reflected beams on face, described first the reflected beams are propagated and described in described prism
Reflect on second surface to form the second the reflected beams, described second the reflected beams are through described exit face；Luminous flux measurement
Meter, for measuring the luminous flux of described second the reflected beams；Refractive index computing device, for right according to luminous flux and refractive index
The refractive index calculating testing liquid should be related to.
Preferably, described light source is spotlight.
Preferably, described light source and described luminous flux measurement meter are in the same side of described prism.
Preferably, described first surface is vertical with described second surface.
Preferably, described measuring refractive indexes of liquid system also includes：First collector lens, positioned at described light source and described rib
Between mirror, for converging from the light beam that described light source sends to incide described prism, and described first collector lens
Main shaft passes through the center of described first surface, the center of the described first collector lens distance at center to described first surface with
The center of described first surface is equal to the focal length of described first collector lens to the center of described second surface apart from sum；
Second collector lens, positioned between described luminous flux measurement meter and described prism, for converging the light beam from described prism outgoing,
And the main shaft of described second collector lens passes through the center of described second surface；Described first collector lens and described second are gathered
Optical lens is provided so that from the diverging light that the same luminous point of described light source sends after described second collector lens outgoing
Become directional light.
Preferably, described first collector lens and/or described second collector lens are integrally formed with described prism.
Preferably, the angle of divergence of the light beam that described light source sends is 20-35 degree；The angle of divergence of described incident beam is 13-
20 degree；Described incident light incidence angle on the first surface is 41-68 degree；The refractive index of described prism is 1.56-1.70.
Preferably, described measuring refractive indexes of liquid system also includes：Diaphragm, positioned at described second collector lens and described light
Between flux measurement meter, it is used for filtering veiling glare.
The measuring refractive indexes of liquid system of the utility model embodiment, by using the contact surface in prism and testing liquid
The luminous flux of the light beam of upper reflection and the corresponding relation of the refractive index of this testing liquid, to calculate the refractive index of this testing liquid,
So that only needing to the refractive index that luminous flux measurement meter with low cost just can measure liquid, thus reduce liquid refractivity surveying
The cost of amount system.
Brief description
In order to be illustrated more clearly that the utility model specific embodiment or technical scheme of the prior art, below will be right
In specific embodiment or description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, below describe
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of existing measuring device for liquid refractive index；
Fig. 2 is the structural representation of the measuring refractive indexes of liquid system of the utility model embodiment 1；
Fig. 3 is the structural representation of the measuring refractive indexes of liquid system of the utility model embodiment 2；
Fig. 4 is the structural representation of the measuring refractive indexes of liquid system of the utility model embodiment 3；
Fig. 5 is the light path schematic diagram of the measuring refractive indexes of liquid system of the utility model embodiment 3；
Fig. 6 is the top view of the measuring refractive indexes of liquid system of the utility model embodiment；
Fig. 7 is the sectional view of the measuring refractive indexes of liquid system of the utility model embodiment；
Fig. 8 is the measuring refractive indexes of liquid systematic difference schematic diagram of a scenario of the utility model embodiment.
Specific embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is clearly and completely described it is clear that described
Embodiment is a part of embodiment of the utility model, rather than whole embodiments.Based on the embodiment in the utility model, this
The every other embodiment that field those of ordinary skill is obtained under the premise of not making creative work, broadly falls into this practicality
Novel protected scope.
In description of the present utility model, " " center ", " on ", D score, "left", "right", " perpendicular it should be noted that term
Directly ", the orientation of instruction such as " level ", " interior ", " outward " or position relationship are based on orientation shown in the drawings or position relationship, are only
For the ease of description the utility model with simplify description, rather than instruction or the hint device of indication or element must have specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.Additionally, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or hint relative importance.
As long as additionally, involved technical characteristic in the utility model different embodiments disclosed below is each other
The conflict of not constituting just can be combined with each other.
Embodiment 1
As shown in Fig. 2 the utility model embodiment 1 provides a kind of measuring refractive indexes of liquid system, including：
Light source U1, preferably spotlight (Spot Light), such as light-focusing type LED/light source, for limiting entering of incident beam
Firing angle degree；
Prism U3, the first surface S2 contacting with quantity of fluid X to be measured including the plane of incidence, second surface S3 and exit facet, should
The light beam that light source sends incides to form incident beam in this prism through this plane of incidence, and this incident beam is propagated in this prism
And be at least partly totally reflected to form the first the reflected beams on the first surface, this first the reflected beams is propagated in this prism
And reflect to form the second the reflected beams on a second surface, the second the reflected beams are through exit face；Wherein, this second surface
It is preferably coated with reflectance coating, this reflectance coating is preferably high inverse medium film or aluminium film, to strengthen reflecting effect；
Luminous flux measurement meter U2, for the luminous flux of this second the reflected beams through this exit face for the measurement；
Refractive index computing device (not shown), for calculating testing liquid according to the corresponding relation of luminous flux and refractive index
Refractive index.
The measuring refractive indexes of liquid system of the utility model embodiment, by using the contact surface in prism and testing liquid
The luminous flux of the light beam of upper reflection and the corresponding relation of the refractive index of this testing liquid, to calculate the refractive index of this testing liquid,
So that only needing to the refractive index that luminous flux measurement meter with low cost just can measure liquid, thus reducing liquid refractivity
The cost of measuring system.
Preferably, light source U1 and luminous flux measurement meter U2, in the same side of prism U3, thereby assists in reduction device volume.
Preferably, first surface S2 is vertical with second surface S3.
Preferably, this luminous flux measurement meter U2 is based on silicon photocell.
Embodiment 2
As shown in figure 3, on the basis of embodiment 1, the present embodiment further includes：
First collector lens S1, between light source U1 and prism U3, for converging the light beam sending from light source U1 to enter
It is mapped in prism U3, and the main shaft of this first collector lens passes through the center o of this first surface S2, this first collector lens
Center m to the distance at the center 0 of this first surface and this first surface center 0 arrive this second surface center n ' distance it
With the focal length f equal to this first collector lenss1The distance of m to n (i.e. in Fig. 3), thus by light source U1 complete as projecting this
On second surface；Second collector lens S4, positioned between luminous flux measurement meter U2 and prism U3, for converging from prism outgoing
Light beam, and the main shaft of this second collector lens passes through the center n ' of this second surface；Thus, the sense on luminous flux measurement meter U2
Luminous point U, V and Z, receive the light of different luminous point A, B and the C from light source U1 respectively, contribute to luminous flux measurement meter U2 and connect
The homogenization of the light beam receiving.Preferably, this first collector lens and/or this second collector lens are integrally formed with this prism,
It is highly preferred that be using optical grade resin molding process integrated molding, thus ensure the assembling uniformity of optics.
Further, this first collector lens and this second collector lens are set to, and send out from the same luminous point of this light source
The diverging light going out becomes directional light after this second collector lens outgoing.As shown in figure 5, send from the luminous point A of light source U1
Diverging light a1, a2 and a3, are changed into directional light after sequentially passing through first collector lens S1, prism U3 and the second collector lens S4
A1, a2 and a3, likewise, the diverging light b1 sending from the luminous point B of light source U1, b2 and b3 also becomes directional light b1, b2 and b3,
The diverging light c1 sending from the luminous point C of light source U1, c2 and c3 also become directional light c1, c2 and c3.Thus, by by light source
The light that arbitrfary point sends equably is radiated on the photosensitive surface of luminous flux measurement meter it is achieved that luminous flux measurement meter U2 receives
Light beam homogenization, i.e. the light beam that luminous flux measurement meter U2 receives is overall brightening or dimmed, as shown in figure 3, working as quilt
Survey solution refractive index hour, the light beam that luminous flux measurement meter U2 receives is brighter, and luminous flux is larger, when detected solution refractive index is big
When, the light beam that luminous flux measurement meter U2 receives is dark, and luminous flux is less.
Preferably, the center line (II) of this second collector lens S4 and the center line (I) of first collector lens S1 are parallel；Light
The center of flux measurement meter U2 is on the center line (II) of this S4.The center line (I) of this first collector lens S1 and the folder in S2 face
Angle is acute angle, and the center of light source U1 is on the center line (I) in this S1 face.
Preferably, in order that the refractometry scope of system, to 1.32-1.52, arranges the beam divergence angle that light source sends
For 20-35 degree；The center line of first collector lens is 50-65 degree with the angle a of (I) and first surface S2；Incident beam send out
Scattered angle is 13-20 degree；Incident light incidence angle on the first surface is 41-68 degree；The refractive index of prism is 1.56-1.70.
Preferably, this first collector lens is spherical mirror, more preferably aspherical mirror, to revise the incidence of incident beam
Angular region.Preferably, the centre of radius of aspherical mirror is minimum, and edge is maximum, and become turn to continuous, smooth, dull.
Preferably, this second collector lens is preferably spherical mirror, more preferably aspherical mirror, incides light to adjust
The incident angle of the light beam on flux measurement meter U2.
Embodiment 3
As shown in figure 4, on the basis of embodiment 2, the present embodiment further includes diaphragm U4, positioned at the second collector lens
Between S4 and luminous flux measurement meter U2, it is used for filtering veiling glare, improve certainty of measurement.
Further illustrate the measuring device for liquid refractive index according to embodiment of the present utility model referring to Fig. 6-8, figure
Measuring device for liquid refractive index shown in 6-8 is example, is not intended to carry out any restriction to the utility model.
Measuring device for liquid refractive index as shown in figs 6-8 is long strip type, including upper shell 11 and lower house 19.
This upper shell is used for the encapsulation of optical module and process circuit, and its upper surface is disposed with measuring cell from left to right
10, for accommodating quantity of fluid to be measured；LCDs 12, for showing the refractive index of testing liquid or corresponding with refractive index dense
Angle value；Scale conversion keys 13, for switching various measurement results (refractive index or the concentration corresponding with refractive index of testing liquid
Value)；Calibration button 14, is used for carrying out zero point correction；Measurement button 15, for starting measurement.
This lower house 19 and upper shell 11 are collectively forming the housing of closing it is preferable that lower house and upper shell are by ultrasonic
Ripple is welded to connect, and reaches waterproof requirement.
In housing, measuring cell bottom is provided with optical module, this optical module includes being arranged on sensor circuit board
Resin prism U3 in LED/light source U1 on 20, photocell U2 and temperature transducer 17, and the fixing body 16 of optical system,
Wherein, because the refractive index of liquid can change with temperature, this temperature transducer is therefore set to measure the temperature of liquid.In shell
The opposite side of body, is arranged with main circuit board 18 in LCDs.
When using, as shown in figure 8, the measuring cell side of this measuring device for liquid refractive index is immersed in testing liquid,
Testing liquid is made to be full of measuring cell, opposite side, on testing liquid, exposes LCDs.Can also be according to actual need
Will, arranging this measuring device for liquid refractive index is integral waterproofing, can also measure in overall immersion testing liquid.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.Right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or
Change among still in protection domain of the present utility model.
Claims (17)
1. a kind of measuring refractive indexes of liquid system is it is characterised in that include：
Light source；
Prism, the first surface contacting with quantity of fluid to be measured including the plane of incidence, second surface and exit facet, described light source sends
Light beam incide to form incident beam in described prism through the described plane of incidence, described incident beam is propagated in described prism
And be at least partly totally reflected to form the first the reflected beams on the first surface, described first the reflected beams are in described prism
Interior propagate and reflect on described second surface to form the second the reflected beams, described second the reflected beams go out through described exit facet
Penetrate；
Luminous flux measurement meter, for measuring the luminous flux of described second the reflected beams；
Refractive index computing device, for calculating the refractive index of testing liquid according to the corresponding relation of luminous flux and refractive index.
2. measuring system according to claim 1 is it is characterised in that described light source is spotlight.
3. measuring system according to claim 1 and 2 is it is characterised in that described light source and described luminous flux measurement meter exist
The same side of described prism.
4. measuring system according to claim 1 and 2 is it is characterised in that described first surface is hung down with described second surface
Directly.
5. measuring system according to claim 1 and 2 is it is characterised in that also include：
First collector lens, between described light source and described prism, for converging the light beam sending from described light source to enter
It is mapped in described prism, and the main shaft of described first collector lens passes through the center of described first surface, described first optically focused
The center of the distance at the center to described first surface for the center of lens and described first surface is to the center of described second surface
Apart from sum be equal to described first collector lens focal length；
Second collector lens, positioned between described luminous flux measurement meter and described prism, for converging from described prism outgoing
Light beam, and the main shaft of described second collector lens passes through the center of described second surface；
Described first collector lens and described second collector lens are provided so as to send from the same luminous point of described light source
Diverging light become directional light after described second collector lens outgoing.
6. measuring system according to claim 3 is it is characterised in that also include：
First collector lens, between described light source and described prism, for converging the light beam sending from described light source to enter
It is mapped in described prism, and the main shaft of described first collector lens passes through the center of described first surface, described first optically focused
The center of the distance at the center to described first surface for the center of lens and described first surface is to the center of described second surface
Apart from sum be equal to described first collector lens focal length；
Second collector lens, positioned between described luminous flux measurement meter and described prism, for converging from described prism outgoing
Light beam, and the main shaft of described second collector lens passes through the center of described second surface；
Described first collector lens and described second collector lens are provided so as to send from the same luminous point of described light source
Diverging light become directional light after described second collector lens outgoing.
7. measuring system according to claim 4 is it is characterised in that also include：
First collector lens, between described light source and described prism, for converging the light beam sending from described light source to enter
It is mapped in described prism, and the main shaft of described first collector lens passes through the center of described first surface, described first optically focused
The center of the distance at the center to described first surface for the center of lens and described first surface is to the center of described second surface
Apart from sum be equal to described first collector lens focal length；
Second collector lens, positioned between described luminous flux measurement meter and described prism, for converging from described prism outgoing
Light beam, and the main shaft of described second collector lens passes through the center of described second surface；
Described first collector lens and described second collector lens are provided so as to send from the same luminous point of described light source
Diverging light become directional light after described second collector lens outgoing.
8. measuring system according to claim 5 is it is characterised in that described first collector lens and/or described second are gathered
Optical lens is integrally formed with described prism.
9. the measuring system according to claim 6 or 7 is it is characterised in that described first collector lens and/or described second
Collector lens is integrally formed with described prism.
10. measuring system according to claim 5 is it is characterised in that the angle of divergence of light beam that described light source sends is 20-
35 degree；The angle of divergence of described incident beam is 13-20 degree；Described incident light incidence angle on the first surface is 41-68
Degree；The refractive index of described prism is 1.56-1.70.
11. measuring systems according to claim 6 or 7 are it is characterised in that the angle of divergence of light beam that sends of described light source
For 20-35 degree；The angle of divergence of described incident beam is 13-20 degree；Described incident light incidence angle on the first surface is
41-68 degree；The refractive index of described prism is 1.56-1.70.
12. measuring systems according to claim 5 are it is characterised in that also include：Diaphragm, saturating positioned at described second optically focused
Between mirror and described luminous flux measurement meter, it is used for filtering veiling glare.
13. measuring systems according to claim 6 or 7 are it is characterised in that also include：Diaphragm, positioned at described second optically focused
Between lens and described luminous flux measurement meter, it is used for filtering veiling glare.
14. measuring systems according to claim 8 are it is characterised in that also include：Diaphragm, saturating positioned at described second optically focused
Between mirror and described luminous flux measurement meter, it is used for filtering veiling glare.
15. measuring systems according to claim 9 are it is characterised in that also include：Diaphragm, saturating positioned at described second optically focused
Between mirror and described luminous flux measurement meter, it is used for filtering veiling glare.
16. measuring systems according to claim 10 are it is characterised in that also include：Diaphragm, saturating positioned at described second optically focused
Between mirror and described luminous flux measurement meter, it is used for filtering veiling glare.
17. measuring systems according to claim 11 are it is characterised in that also include：Diaphragm, saturating positioned at described second optically focused
Between mirror and described luminous flux measurement meter, it is used for filtering veiling glare.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620498107.8U CN205982082U (en) | 2016-05-26 | 2016-05-26 | Liquid refractometry system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620498107.8U CN205982082U (en) | 2016-05-26 | 2016-05-26 | Liquid refractometry system |
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| Publication Number | Publication Date |
|---|---|
| CN205982082U true CN205982082U (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620498107.8U Expired - Fee Related CN205982082U (en) | 2016-05-26 | 2016-05-26 | Liquid refractometry system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954232A (en) * | 2016-05-26 | 2016-09-21 | 北京领航力嘉机电有限公司 | Liquid refractive index measuring system |
| CN109253991A (en) * | 2017-07-12 | 2019-01-22 | 恩德莱斯和豪瑟尔分析仪表两合公司 | optical sensor |
| CN109781591A (en) * | 2019-01-25 | 2019-05-21 | 淄博澳谱仪器有限公司 | A kind of measurement method and measuring device of sample refractive index |
-
2016
- 2016-05-26 CN CN201620498107.8U patent/CN205982082U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954232A (en) * | 2016-05-26 | 2016-09-21 | 北京领航力嘉机电有限公司 | Liquid refractive index measuring system |
| CN105954232B (en) * | 2016-05-26 | 2019-02-12 | 北京领航力嘉机电有限公司 | A kind of measuring refractive indexes of liquid system |
| CN109253991A (en) * | 2017-07-12 | 2019-01-22 | 恩德莱斯和豪瑟尔分析仪表两合公司 | optical sensor |
| CN109781591A (en) * | 2019-01-25 | 2019-05-21 | 淄博澳谱仪器有限公司 | A kind of measurement method and measuring device of sample refractive index |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170222 Termination date: 20200526 |
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