CN220063832U - Transparent liquid refractive index measuring device - Google Patents
Transparent liquid refractive index measuring device Download PDFInfo
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- CN220063832U CN220063832U CN202321547984.6U CN202321547984U CN220063832U CN 220063832 U CN220063832 U CN 220063832U CN 202321547984 U CN202321547984 U CN 202321547984U CN 220063832 U CN220063832 U CN 220063832U
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- 239000007788 liquid Substances 0.000 title claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 229920003023 plastic Polymers 0.000 claims description 4
- 238000000034 method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000447394 Desmos Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 238000011545 laboratory measurement Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model discloses a measuring device for refractive index of transparent liquid, which belongs to the technical field of refractive index measurement of liquid and comprises a transparent water tank; the transparent water tank is used for injecting liquid to be tested; a thin wire is fixed at the liquid surface of the transparent water tank; the transparent water tank is provided with a side wall with a higher side; the higher side wall is carved with refractive index values; a fixed point is arranged on the opposite water tank wall of the higher side wall. The utility model solves the problems of complicated operation and higher cost in the prior art for measuring the refractive index of the transparent liquid, and the adopted device for measuring the refractive index of the transparent liquid has the advantages of simple structure, convenient operation, quick and accurate reading and lower cost, and can lead an observer to directly read the refractive index of the transparent liquid through observation, thereby saving time and labor.
Description
Technical Field
The utility model relates to the technical field of liquid refractive index measurement, in particular to a transparent liquid refractive index measurement device.
Background
Refractive index is one of the commonly used optical parameters, and measuring the refractive index of an object is of great importance in many research fields. Conventional methods for measuring refractive index include minimum deflection angle method, abbe refractometer critical angle method, interferometry, etc. The refractive index of transparent liquid is measured by constructing a mathematical model by using a liquid refractive index formula in combination with a teaching aid in Sun Liping and Ma Ning, homemade liquid refractive index measuring apparatus. It also suffers from a number of disadvantages: the experimental equipment required in the experiment is more numerous, the refractive index measurement process is more complicated to operate, and the cost is higher.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, provides a device for measuring the refractive index of transparent liquid, and solves the problems of complicated operation and higher cost in the prior art for measuring the refractive index of the transparent liquid.
In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:
the utility model provides a measuring device for refractive index of transparent liquid, which comprises a transparent water tank; the transparent water tank is used for injecting liquid to be tested; a thin wire is fixed at the liquid surface of the transparent water tank; the transparent water tank is provided with a side wall with a higher side; the higher side wall is carved with refractive index values; a fixed point is arranged on the opposite water tank wall of the higher side wall.
Further, the transparent water tank is a square transparent plastic water tank.
Further, the water surface height of the liquid to be measured is equal to the fine line.
Further, the thin lines are parallel to the upper sidewalls.
Further, the thin line is parallel to the bottom surface of the transparent water tank.
Further, the sum of the distances of the thin lines from the upper side wall and the opposite water tank wall of the upper side wall is 7-13 cm, preferably 10.3cm.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model discloses a transparent liquid refractive index measuring device, which comprises a transparent water tank, wherein the transparent water tank is used for injecting liquid to be measured; a thin wire is fixed at the liquid surface of the transparent water tank; the transparent water tank is provided with a side wall with a higher side; the higher side wall is carved with refractive index values; a fixed point is arranged on the opposite water tank wall of the higher side wall. The device for measuring the refractive index of the transparent liquid has the advantages of simple structure, convenient operation, rapid and accurate reading and low cost, and can lead an observer to directly read the refractive index of the transparent liquid through observation, thereby saving time and labor.
Drawings
FIG. 1 is a schematic diagram of a transparent liquid refractive index measurement device according to an embodiment of the present utility model;
in the figure: 1. a transparent water tank; 2. a thin wire; 3. fixed point; 4. a higher sidewall.
Detailed Description
The following detailed description of the technical solutions of the present utility model will be given by way of the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present utility model are detailed descriptions of the technical solutions of the present utility model, and not limiting the technical solutions of the present utility model, and that the embodiments and technical features of the embodiments of the present utility model may be combined with each other without conflict.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Embodiment one:
as shown in fig. 1, the embodiment provides a device for measuring refractive index of transparent liquid, the device comprises a transparent water tank 1, the transparent water tank 1 is a square transparent plastic water tank, and the transparent water tank 1 is used for injecting liquid to be measured. A thin line 2 is fixed at the liquid level of the transparent water tank 1, and the water level of the liquid to be measured is equal to the thin line 2. The thin wire 2 is parallel to the upper side wall 4 and the bottom surface of the transparent water tank 1. The transparent water tank 1 is provided with a side wall 4 with a higher side; the higher side wall 4 is carved with refractive index values; a fixed point 3 is provided on the opposite water sump wall of the upper side wall 4. The sum of the distances of the thread 2 from the upper side wall 4 and the opposite water trough wall of the upper side wall 4 is in the range of 7-13 cm, preferably 10.3cm.
Working principle:
the refractive index of the transparent liquid is measured by using the measuring device for refractive index of the transparent liquid provided by the embodiment, and the measuring device comprises the following steps:
step one: injecting liquid to be tested into a transparent water tank 1 fixed with a thin wire 2;
the transparent water tank 1 is a square transparent plastic water tank. The transparent water tank 1 is provided with a side wall 4 with a higher side, and the height of the side wall 4 is higher than that of the other three side walls. The higher side wall 4 is engraved with a corresponding refractive index value. The liquid level of the injected liquid is at the position of the thin line 2, and the thin line 2 is parallel to the upper side wall 4 and the bottom surface of the transparent water tank 1.
Step two: observing the thin line 2 and the fixed point 3 on the wall of the opposite water tank through the higher side wall 4 of the transparent water tank 1, enabling the thin line 2 and the fixed point 3 to coincide in the sight line, and marking the position of the sight line passing through the higher side wall 4;
when the coincidence of the fixed point 3 on the wall of the opposite water tank in the liquid, the thin line 2 at the liquid level and the scale point on the higher side wall 4 is observed, the three positions are located on the same refraction light path.
Step three: and obtaining the refractive index scale value corresponding to the mark.
The refractive index of the transparent liquid can be directly read by an observer by observing the position of the mark.
The marking method of the refractive index scale value includes:
selecting a point on the higher side wall 4, and acquiring the distance from the point to the liquid level; the refractive index of the liquid when the line of sight passes through the point is calculated from the law of refraction of the light, and the refractive index is marked at the corresponding position on the higher side wall 4. The line of sight passes through this point, the thin line 2 and the fixed point 3 coincide in the line of sight.
According to the law of refraction of light (n 1 sinα＝n 2 sin beta) to obtain a measurement formula of the refractive index of the measured liquid. At the interface of air and liquid, light will be refracted, and the refractive index of air is n 2 =1, if the incident angle α and the refraction angle β can be measured, the measured angle α and refraction angle β can be obtainedRefractive index of transparent liquid
The measurement formula of the refractive index of the measured liquid is as follows:
wherein n is Liquid and its preparation method For the refractive index of the liquid being measured, l 1 Distance of the thin line 2 from the upper sidewall 4; l (L) 2 Distance of the thin line 2 from the side wall opposite to the higher side wall 4; d is the distance from the fixed point 3 on the opposite side wall of the higher side wall 4 to the water surface; h is the distance from the point marked on the upper sidewall 4 to the water surface when the thin line 2 and the fixed point 3 on the opposite sidewall are observed through the upper sidewall 4, α is the angle of incidence, and β is the angle of refraction.
When d, l 1 And l 2 When known, different h corresponds to different refractive indices. The refractive index corresponding to h is marked on the higher sidewall 4, and can be read out according to the mark position. The measurement may be repeated to average.
Taking into account the measured refractive index of the liquid and d, h, l 1 And l 2 In combination with the error transfer formula, an influence formula of each parameter in the liquid refractive index measurement formula on the uncertainty of the refractive index is determined. And carrying out error analysis according to an influence formula of each parameter on the uncertainty of the refractive index, and determining a parameter value in a measurement formula of the refractive index of the measured liquid.
The influence formula of each parameter in the liquid refractive index measurement formula on the uncertainty of the refractive index is as follows:
wherein u is n For the effect of each parameter in the liquid refractive index measurement formula on the refractive index uncertainty,measuring l for graduated scale 1 Error limit of measurement,/->Measuring l for graduated scale 2 Measurement error limit of u h Measurement error limit for measuring h by graduated scale, u d The measurement error limit of d is measured for the scale.
During laboratory measurement, the scales measure d, h and l 1 And l 2 The measurement error limit of (2) is: i.e. < ->In addition, consider fixing 1 And l 2 In the time, h and d are in one-to-one correspondence and are combined with the formula +.>Research of u using desmos graphic calculator n -l 2 Functional image, and sequentially discuss successive changes d and l 1 +l 2 Value pair u of (2) n -l 2 Influence of the functional image. From the error analysis, when 1 And l 2 The larger d is, the smaller the refractive index measurement error is when determining; when l 1 +l 2 When the value of (2) is increased to about 10cm, the corresponding refractive index measurement error will remain unchanged at the minimum value. Furthermore, when the refractive index of the liquid is larger, l is appropriately reduced 1 +l 2 The value of (2) helps to reduce measurement errors. The proposal therefore suggests to select a point with a larger d when in use, i.e. a point within 1cm of the bottom of the transparent sink 1 and which is capable of coinciding with the thin line 2 in the line of sight corresponding to the higher side wall 4. Thus, l 1 +l 2 Preferably between 7 and 13cm, the thin line 2 should be fixed close to the upper side wall 4, which can reduce the measurement sample size while improving the accuracy of the measured refractive index.
Embodiment two:
taking the refractive index of water as an example, a square transparent water tank 1 is first prepared, the square transparent water tank 1 is provided with a higher side wall 4, and the height of the higher side wall 4 is 8cm higher than that of the other three side walls. The liquid surface of the square transparent water tank 1 is fixedly provided with a thin line 2, and the square transparent water tank 1 has the dimensions of 10.3cm long, 1cm wide and 10.0cm high. Pouring water into the square transparent water tank 1, wherein the water surface height is equal to the fine line 2. The thin line 2 is 5.5cm from the shorter trough wall, i.e. l 2 5.5cm, l 1 4.8cm. And then the thin line 2 and the fixed point 3 on the opposite side wall are observed from top to bottom through the higher side wall 4, and when the thin line 2 and the fixed point 3 are overlapped in the sight line, the refractive index corresponding to the scale value on the sight line and the higher side wall 4 is directly read.
According to the above measurement method, several fixed points 3 are sequentially selected on the opposite side wall of the higher side wall 4 to measure the refractive index of water, and the measured data are shown in table 1. The water depth at this time was 8.30cm, l=l 1 +l 2 ＝10.30cm。
The refractive index of water is known to be 1.3330, and the maximum error in measurement is known to be 0.041 from measurement data. The data prove that the refractive index of the transparent liquid is measured accurately by using the device for measuring the refractive index of the transparent liquid.
Table 1 refractive index measurement data of water
| h/cm | d/cm | l 1 /cm | l 2 /cm | n | |
| 1 | 3.50 | 7.20 | 4.80 | 5.50 | 1.331 |
| 2 | 2.60 | 6.40 | 4.80 | 5.50 | 1.349 |
| 3 | 1.70 | 5.80 | 4.80 | 5.50 | 1.369 |
| 4 | 0.20 | 5.20 | 4.80 | 5.50 | 1.374 |
In summary, the embodiment of the utility model discloses a device for measuring the refractive index of transparent liquid, which has the advantages of simple structure, convenient operation, rapid and accurate reading, low cost, time saving and labor saving, and can enable an observer to directly read the refractive index of the transparent liquid through observation.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.
Claims (6)
1. The device for measuring the refractive index of transparent liquid is characterized by comprising a transparent water tank (1); the transparent water tank (1) is used for injecting liquid to be detected; a thin wire (2) is fixed at the liquid surface of the transparent water tank (1); the transparent water tank (1) is provided with a side wall (4) with a higher side; the higher side wall (4) is carved with refractive index values; a fixed point (3) is arranged on the opposite water tank wall of the higher side wall (4).
2. The transparent liquid refractive index measurement apparatus according to claim 1, wherein the transparent water tank (1) is a square transparent plastic water tank.
3. The device for measuring the refractive index of a transparent liquid according to claim 1, wherein the water surface height of the liquid to be measured is level with the thin line (2).
4. A device for measuring the refractive index of a transparent liquid according to claim 3, characterized in that the thin line (2) is parallel to the upper side wall (4).
5. The device for measuring the refractive index of a transparent liquid according to claim 4, wherein the thin line (2) is parallel to the bottom surface of the transparent water tank (1).
6. The device for measuring the refractive index of transparent liquid according to claim 1, wherein the sum of the distances between the thin line (2) and the upper side wall (4) and the wall of the water tank opposite to the upper side wall (4) is 7-13 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321547984.6U CN220063832U (en) | 2023-06-16 | 2023-06-16 | Transparent liquid refractive index measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321547984.6U CN220063832U (en) | 2023-06-16 | 2023-06-16 | Transparent liquid refractive index measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220063832U true CN220063832U (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321547984.6U Active CN220063832U (en) | 2023-06-16 | 2023-06-16 | Transparent liquid refractive index measuring device |
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| CN (1) | CN220063832U (en) |
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2023
- 2023-06-16 CN CN202321547984.6U patent/CN220063832U/en active Active
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