CN214011051U - Device for measuring liquid refractive index - Google Patents
Device for measuring liquid refractive index Download PDFInfo
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- CN214011051U CN214011051U CN202022359733.8U CN202022359733U CN214011051U CN 214011051 U CN214011051 U CN 214011051U CN 202022359733 U CN202022359733 U CN 202022359733U CN 214011051 U CN214011051 U CN 214011051U
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Abstract
The utility model provides a measuring device of liquid refracting index, measuring device includes: the rotary table is provided with a circular ring angle gauge; the transparent liquid container is cylindrical and is arranged at the center of the rotating platform, and the transparent liquid container comprises a bottom wall and a side wall; the transparent partition plate is arranged in the transparent liquid container and is vertical to the bottom wall, the transparent partition plate divides the transparent liquid container into a first accommodating chamber and a second accommodating chamber, air is arranged in the first accommodating chamber, and liquid to be detected is arranged in the second accommodating chamber; and the light source is arranged on one side of the transparent partition plate and irradiates towards the second accommodating chamber. Divide into first accommodation chamber and second accommodation chamber with transparent liquid container, set up the air in first accommodation chamber, set up the liquid that awaits measuring in the second accommodation chamber, light source illumination is to the second accommodation chamber, and rotatory revolving stage when taking place the total reflection, acquires incident angle, and then acquires the refracting index of the liquid that awaits measuring, simple structure, convenient operation.
Description
Technical Field
The utility model relates to a liquid parameter measurement technical field especially relates to a measuring device of liquid refracting index.
Background
The liquid refractive index is one of important parameters for representing the optical characteristics of the liquid, the problem of measuring the refractive index can be encountered in engineering and scientific research, the direct measurement of the liquid refractive index is necessary in many research fields, the traditional Newton's ring interferometry has the experimental phenomenon of blurred field of view and unobvious interference fringe phenomenon when measuring the liquid refractive index, and thus larger experimental error is generated.
In order to measure the refractive indexes of different transparent liquids, many researchers in China design a liquid refractive index measuring device, and the like based on a Michelson interferometer and a Sun interferometer and measure the refractive indexes of the transparent liquids through the change number of interference fringes.
Therefore, it is necessary to develop a device for measuring the refractive index of liquid, which can be applied to teaching, is convenient for students to operate, has a simple structure, accurate measurement result and good economy.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art or the correlation technique.
Therefore, the utility model provides a measuring device of liquid refracting index.
In view of this, the utility model provides a measuring device of liquid refracting index, measuring device includes:
the rotary table is provided with a circular ring angle gauge;
the transparent liquid container is cylindrical and is arranged at the center of the rotating platform, and the transparent liquid container comprises a bottom wall and a side wall;
the transparent partition plate is arranged in the transparent liquid container, is vertical to the bottom wall and divides the transparent liquid container into a first accommodating chamber and a second accommodating chamber, wherein air is arranged in the first accommodating chamber, and liquid to be detected is arranged in the second accommodating chamber;
and the light source is arranged on one side of the transparent partition plate and irradiates the second accommodating chamber.
Further, the light source is disposed on a first support frame, the first support frame including:
the supporting tube is provided with a supporting arc plate, the light source is arranged on the supporting arc plate, and the supporting arc plate is matched with the light source;
the level gauge is arranged on the supporting arc plate;
and the bolt penetrates through the supporting arc plate, and the angle between the light source and the horizontal ground is adjusted by screwing in and out the bolt.
Further, the measuring device further includes:
the second support frame is arranged on one side of the rotating table through a base;
the angle sensor is arranged on the second support frame and is positioned on a central shaft of the transparent liquid container;
a first gear connected with a central shaft of the angle sensor;
the second gear is arranged at the center of the transparent partition plate through a fixed rod, and the first gear is meshed with the second gear;
wherein the first gear and the second gear have the same shape, size and number of teeth.
Further, the measuring device further includes:
the supporting column is arranged on the outer side of the transparent liquid container and is fixedly connected with the rotating table;
and the photosensitive sensor is arranged on the supporting column and is positioned on the extending plate of the transparent clapboard.
Further, the measuring device further includes:
the controller is respectively electrically connected with the angle sensor and the photosensitive sensor, the angle of the angle sensor is obtained according to the light sensation signal of the photosensitive sensor, and the controller calculates the refractive index of the liquid to be measured according to the angle.
Further, the measuring device further includes:
and the display screen is electrically connected with the controller and is used for displaying the angle acquired by the controller and the refractive index of the liquid to be detected.
Further, the rotating table is driven by the rotating motor.
Further, the measuring device further includes:
the protective cover is arranged on the rotating platform, the light source, the first supporting frame, the second supporting frame and the controller.
Further, the protective cover is made of an acrylic plate.
Furthermore, the transparent partition plate is made of an acrylic plate.
The utility model provides a technical scheme can include following beneficial effect:
according to the formula of total reflection, divide into first accommodation chamber and second accommodation chamber with transparent liquid container, set up the air in first accommodation chamber, set up the liquid that awaits measuring in the second accommodation chamber, the light source shines to the second accommodation chamber, and rotatory revolving stage when taking place the total reflection, acquires incident angle, and then acquires the refracting index of the liquid that awaits measuring, simple structure, convenient operation, the student's operation of being convenient for, the component acquires easily, has good economic nature.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a schematic view of a device for measuring the refractive index of a liquid according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of components on another angular-rotation stage according to an embodiment of the present invention;
fig. 3 shows a schematic view of a first support frame according to an embodiment of the invention;
fig. 4 shows a schematic view of a light source propagating in a transparent barrier according to an embodiment of the invention;
fig. 5 shows a prior art principle diagram of the law of total reflection.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:
the automatic detection device comprises a rotating platform 1, a transparent liquid container 2, a transparent partition plate 3, a first containing chamber 4, a second containing chamber 5, a light source 6, a first supporting frame 7, a supporting pipe 701, a supporting arc plate 702, a bolt 703, a second supporting frame 8, an angle sensor 9, a first gear 10, a second gear 11, a fixing rod 12, a supporting column 13, a photosensitive sensor 14, a base 15 and a protective cover 16.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 5 shows a prior art principle diagram of the law of total reflection.
As shown in FIG. 5, n 11 is the refractive index of air, n2For the refractive index of the liquid to be measured, a beam of light enters the optically thinner medium (air) from the optically denser medium (liquid to be measured), when the light is totally reflected, β is 90 °, sin β is 1, and the refractive index is as follows:
this can result in:
wherein n is2The refractive index of the liquid to be measured can be measured only by measuring the incident angle alpha of the incident light, which is the manufacturing principle of the measuring device of the present invention.
Fig. 1 shows a schematic view of a device for measuring the refractive index of a liquid according to an embodiment of the present invention; fig. 2 shows a schematic view of the components of another angular rotation stage according to an embodiment of the present invention.
As shown in fig. 1 and fig. 2, the utility model provides a measuring device for liquid refractive index, this measuring device includes:
the rotary table 1 is provided with a circular ring angle gauge;
the transparent liquid container 2 is cylindrical, the transparent liquid container 2 is arranged at the center of the rotating platform 1, and the transparent liquid container 2 comprises a bottom wall and a side wall;
the transparent liquid container 3 is arranged in the transparent liquid container 2, the transparent liquid container 3 is vertical to the bottom wall, the transparent liquid container 3 divides the transparent liquid container 2 into a first containing chamber 4 and a second containing chamber 5, wherein air is arranged in the first containing chamber 4, and liquid to be detected is arranged in the second containing chamber 5;
and a light source 6 provided on one side of the transparent liquid container 3, wherein the light source 6 irradiates the second accommodating chamber 5.
According to the formula of total reflection, divide into first accommodation chamber 4 and second accommodation chamber 5 with transparent liquid container 2, set up the air in first accommodation chamber 4, set up the liquid that awaits measuring in second accommodation chamber 5, light source 6 shines to second accommodation chamber 5, rotatory revolving stage 1, when taking place the total reflection, acquires incident angle, and then acquires the refracting index of the liquid that awaits measuring, simple structure, convenient operation, the student's operation of being convenient for, the component acquires easily, has good economic nature.
It should be noted that the transparent liquid container 2 of the present embodiment is a cylindrical glass, and the reason why the cylindrical shape is selected is to avoid the fact that the light source 6 is refracted by the edge angle of the non-cylindrical liquid container, which affects the measurement accuracy, and the transparent partition plate 3 is made of acrylic plate.
Fig. 3 shows a schematic view of a first support frame according to an embodiment of the invention.
As shown in fig. 3, the light source 6 is disposed on the first support frame 7, and the first support frame 7 includes:
a supporting pipe 701 is provided, a supporting arc plate 702 is arranged on the supporting pipe 701, the light source 6 is arranged on the supporting arc plate 702, and the supporting arc plate 702 is matched with the light source 6;
a level gauge disposed on the support arc plate 702;
the bolt 703 penetrates the supporting arc plate 702, and the angle between the light source 6 and the horizontal ground is adjusted by screwing in and out the bolt 703.
The bolts 703 penetrate through the supporting arc plate 702 to contact with the light source 6, so that the angle between the light source 6 and the horizontal ground can be adjusted, and the light source 6 is kept parallel to the horizontal ground, namely, is positioned on the same horizontal plane with the rotary table 1 through the calibration of the level gauge.
The light source 6 of the present embodiment is a laser light source 6.
Further, the measuring device further includes:
a second support frame 8 arranged on one side of the rotary table 1 through a base 15;
the angle sensor 9 is arranged on the second support frame 8, and the angle sensor 9 is positioned on the central shaft of the transparent liquid container 2;
a first gear 10 connected to a central shaft of the angle sensor 9;
a second gear 11 provided at the center of the transparent liquid container 3 by a fixing lever 12, the first gear 10 being engaged with the second gear 11;
the first gear 10 and the second gear 11 have the same shape, size and number of teeth.
Generally, in the measurement of an incident angle, a great error is caused by manual reading, which affects the measurement accuracy, so that a more intelligent angle sensor 9 is adopted to read angle data, in order to ensure that the angle sensor 9 and the transparent liquid container 2 can coaxially rotate, and reduce the measurement error, so that the rotating angle of the angle sensor 9 is the incident angle of incident light of the light source 6, in the embodiment, a mechanical principle of gear meshing transmission is utilized, a first gear 10 and a second gear 11 which are identical in shape, size and tooth number (ensuring that the transmission ratio is 1 during meshing are adopted), the first gear 10 and the angle sensor 9 are coaxially fixed, the second gear 11 is fixed at the center of the transparent liquid container 3 through a fixing rod 12, and the second gear 11 can be supported to a certain height through the arrangement of the fixing rod, so as to ensure the meshing of the first gear 10 and the second gear 11, by rotating the rotating platform 1, when the incident light of the light source 6 is totally reflected, the rotating angle of the angle sensor 9 is the incident angle of the incident light of the light source 6, so that the incident angle of the incident light of the light source 6 can be accurately measured.
Wherein, second support frame 8 is the PVC pipe, lightly acquires well, and second support frame 8 includes straightway and crooked section, and angle sensor 9 is located the below of crooked section, makes angle sensor 9 towards the top of transparent liquid container 2 to first gear 10 on the angle sensor 9 and the effective meshing of second gear 11 on the transparent liquid container 3.
Fig. 4 shows a schematic view of a light source propagating in a transparent liquid container according to an embodiment of the invention.
The transparent liquid container 3 of the present embodiment is an acrylic plateThe transparent liquid container 2 is divided into a first chamber 4 and a second chamber 5, wherein the first chamber 4 is filled with air, and the second chamber 5 is filled with the liquid to be measured, so that the influence of the acrylic plate on the refraction of the incident optical fiber of the light source 6 is considered, as shown in fig. 4, wherein n 11 is the refractive index of air, n2Is the refractive index of the liquid to be measured, n3For the refractive index of the pressure particle plate, according to the law of refraction:
it can be found that:
it can be seen that the acrylic sheet itself has no effect on the refraction of light, i.e. the refractive index is dependent only on the angle of incidence, and is independent of other factors.
Further, the measuring device further includes:
the supporting column 13 is arranged on the outer side of the transparent liquid container 2, and the supporting column 13 is fixedly connected with the rotating platform 1;
and a photosensor 14 disposed on the support column 13, the photosensor 14 being located on the extension plate of the transparent liquid container 3.
The photosensitive sensor 14 is fixed on the extending plate of the transparent liquid container 3, and can quickly and accurately acquire the optical signal when the light of the light source 6 is totally reflected, so that the time for stopping the rotation of the angle sensor 9 is more accurate, and the measurement accuracy of the measuring device is improved.
Further, the measuring device further includes:
and the controller is respectively electrically connected with the angle sensor 9 and the photosensitive sensor 14, acquires the angle of the angle sensor 9 according to the light sensing signal of the photosensitive sensor 14, and calculates the refractive index of the liquid to be measured according to the angle.
Wherein, measuring device still includes:
and the display screen is electrically connected with the controller and is used for displaying the angle acquired by the controller and the refractive index of the liquid to be measured.
Through controller control, make acquireing of angle data more accurate, improve measurement accuracy, the display screen shows, it is more convenient that the experimenter observes.
Specifically, adopt light source 6 to provide incident light, in the second accommodation chamber 5 that the level was penetrated and is contained the liquid that awaits measuring, this moment, transparent liquid container 2 is in 0 scale position department of ring angle gauge, rotatory revolving stage 1, when incident optic fibre takes place the total reflection, photosensitive sensor 14 receives the light sense signal, angle sensor 9 stall, angle sensor 9 passes the signal of telecommunication of rotation to the controller this moment, calculate through the procedure of compiling in the controller in advance, acquire the refracting index of the liquid that awaits measuring, and show the result through the display screen display, it is more directly perceived, improve the measurement of multiunit data efficiency.
It should be noted that, the controller of this embodiment is a single chip microcomputer, the volume of the single chip microcomputer is small, and the internal chip is used as a computer system, so that the controller is simple in structure, complete in function, very convenient to use, and capable of being applied in a modularized manner.
Further, the rotary table 1 is driven by a rotary motor.
The rotation of the rotating platform 1 is controlled through the rotating motor, so that errors caused by manual rotation can be avoided, and the measuring accuracy is improved.
Further, the measuring device further includes:
and the protective cover 16 is arranged outside the rotating platform 1, the light source 6, the first support frame 7, the second support frame 8 and the controller.
Can protect experimenter's safety through the setting of safety cover 16, avoid when measuring corrosive liquids, because the rotation causes the liquid spill that awaits measuring, cause harm to the experimenter, improve measuring device's security.
Wherein the protective cover 16 is made of acrylic sheet.
The protective cover 16 made of transparent plastic facilitates the experimenter to directly observe the operation condition of the measuring device.
Example 1
In this example, distilled water was poured into the second receiving chamber at room temperature of 20 ℃, and experimental data obtained are shown in table 1:
TABLE 1 refractive index of distilled water
| Number of times | α | |
| 1 | 49.44° | 1.3162 |
| 2 | 49.46° | 1.3159 |
| 3 | 49.42° | 1.3166 |
| 4 | 49.48° | 1.3155 |
| 5 | 49.36° | 1.3178 |
The refractive index n was obtained from the values in Table 12Has an average value of 1.3164, and has a relative error in comparison with the actual refractive index of distilled waterThe difference was 1.27%.
Example 2
In this example, ethanol was poured into the second chamber at room temperature of 20 ℃ and the experimental data obtained are shown in table 2:
TABLE 2 refractive index of ethanol
| Number of times | α | |
| 1 | 47.68° | 1.3524 |
| 2 | 47.69° | 1.3522 |
| 3 | 47.71° | 1.3519 |
| 4 | 47.65° | 1.3531 |
| 5 | 47.70° | 1.3521 |
The refractive index n was obtained from the values in Table 22Has an average value of 1.3523, and has a relative error of 0.67% compared with the actual refractive index of ethanol.
According to embodiment 1 and embodiment 2 can see, the utility model discloses a measuring device's error is in the allowed range, simple structure, and it is accurate to measure, and the student of being convenient for operates, and the component is purchased the preparation and is convenient, has good economic nature.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims (10)
1. A device for measuring the refractive index of a liquid, the device comprising:
the rotary table is provided with a circular ring angle gauge;
the transparent liquid container is cylindrical and is arranged at the center of the rotating platform, and the transparent liquid container comprises a bottom wall and a side wall;
the transparent partition plate is arranged in the transparent liquid container, is vertical to the bottom wall and divides the transparent liquid container into a first accommodating chamber and a second accommodating chamber, wherein air is arranged in the first accommodating chamber, and liquid to be detected is arranged in the second accommodating chamber;
and the light source is arranged on one side of the transparent partition plate and irradiates the second accommodating chamber.
2. The apparatus of claim 1, wherein the light source is disposed on a first support frame, the first support frame comprising:
the supporting tube is provided with a supporting arc plate, the light source is arranged on the supporting arc plate, and the supporting arc plate is matched with the light source;
the level gauge is arranged on the supporting arc plate;
and the bolt penetrates through the supporting arc plate, and the angle between the light source and the horizontal ground is adjusted by screwing in and out the bolt.
3. The apparatus for measuring refractive index of liquid according to claim 2, further comprising:
the second support frame is arranged on one side of the rotating table through a base;
the angle sensor is arranged on the second support frame and is positioned on a central shaft of the transparent liquid container;
a first gear connected with a central shaft of the angle sensor;
the second gear is arranged at the center of the transparent partition plate through a fixed rod, and the first gear is meshed with the second gear;
wherein the first gear and the second gear have the same shape, size and number of teeth.
4. The apparatus for measuring refractive index of liquid according to claim 3, further comprising:
the supporting column is arranged on the outer side of the transparent liquid container and is fixedly connected with the rotating table;
and the photosensitive sensor is arranged on the supporting column and is positioned on the extending plate of the transparent clapboard.
5. The apparatus for measuring refractive index of liquid according to claim 4, further comprising:
the controller is respectively electrically connected with the angle sensor and the photosensitive sensor, the angle of the angle sensor is obtained according to the light sensation signal of the photosensitive sensor, and the controller calculates the refractive index of the liquid to be measured according to the angle.
6. The apparatus for measuring refractive index of liquid according to claim 5, further comprising:
and the display screen is electrically connected with the controller and is used for displaying the angle acquired by the controller and the refractive index of the liquid to be detected.
7. The apparatus for measuring refractive index of liquid according to claim 1, wherein the rotary stage is driven by a rotary motor.
8. The apparatus for measuring refractive index of liquid according to claim 5 or 6, further comprising:
the protective cover is arranged on the rotating platform, the light source, the first supporting frame, the second supporting frame and the controller.
9. The apparatus for measuring refractive index of liquid according to claim 8, wherein the protective cover is made of acrylic plate.
10. The apparatus for measuring the refractive index of a liquid according to any one of claims 1 to 7, wherein the transparent partition is made of acrylic plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022359733.8U CN214011051U (en) | 2020-10-21 | 2020-10-21 | Device for measuring liquid refractive index |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022359733.8U CN214011051U (en) | 2020-10-21 | 2020-10-21 | Device for measuring liquid refractive index |
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| Publication Number | Publication Date |
|---|---|
| CN214011051U true CN214011051U (en) | 2021-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022359733.8U Active CN214011051U (en) | 2020-10-21 | 2020-10-21 | Device for measuring liquid refractive index |
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| CN (1) | CN214011051U (en) |
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- 2020-10-21 CN CN202022359733.8U patent/CN214011051U/en active Active
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