CN211652489U - Angle rotating device for measuring liquid refractive index - Google Patents
Angle rotating device for measuring liquid refractive index Download PDFInfo
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- CN211652489U CN211652489U CN201921862588.6U CN201921862588U CN211652489U CN 211652489 U CN211652489 U CN 211652489U CN 201921862588 U CN201921862588 U CN 201921862588U CN 211652489 U CN211652489 U CN 211652489U
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- 239000007788 liquid Substances 0.000 title claims abstract description 23
- 235000013547 stew Nutrition 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 7
- 230000003287 optical effect Effects 0.000 description 19
- 239000010408 film Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Abstract
The utility model discloses a measure angle rotary device of liquid refracting index, including rotary platform, cell, light string, the angle fixation pole, micrometer caliper, cell among the device stews on rotary platform, and rotary platform passes through the light string with the micrometer caliper and is connected, and the small removal of micrometer caliper on the horizontal direction will "drive" rotary platform's slow rotation like this, and turned angle's size is realized through the angle fixation pole. The rotary platform is arranged between the plane reflector M1 and the light splitting plate G1 of the Michelson interferometer, and the micrometer screw is fixed on the platform of the Michelson interferometer. The utility model discloses an optimal design has guaranteed rotary platform's "slow rotation" to the change progression of clear accurate record interference fringe, and the measuring condition of required "same rotation angle" in the measurement process at every turn. The method has the characteristics of simple operation, and accurate and quick measurement.
Description
The technical field is as follows:
the utility model belongs to the technical field of object refractive index measurement, concretely relates to measure angular rotation device of liquid refractive index.
Background art:
the refractive index of the medium can be measured using wave optics. In wave optics, a change in optical path difference causes a change in the order of interference fringes. That is, the change amount of the optical path difference between the two beams of coherent light can be calculated by the change of the order of the interference fringes of the two beams of coherent light. Thereby calculating the refractive index (n) of the medium.
In the optical path based on the michelson interferometer, the change of the optical path difference is realized by moving the plane mirror M2 or inserting a medium to be measured (a thin film or a liquid) into one of the optical paths. The difference between the two is that when the plane mirror M2 is moved, the optical path difference changes "slowly" in the optical path, and the change to the interference fringe can be observed (captured). However, when a medium to be measured is inserted into one optical path, the change of the optical path difference in the optical path is "abrupt", so that the change of the interference fringe cannot be observed. Therefore, the change in optical path difference must be "very slow" in the experiment to observe the change in interference fringes.
How to achieve a slow change in optical path difference? Some researchers use the wedge-shaped film to be slowly inserted into the optical path, so that the thickness of the film in the optical path is gradually increased, but the processing of the wedge-shaped film has great difficulty and is difficult to operate. A simpler method is the "angle rotation method", i.e. changing the effective thickness of the film in the optical path, thereby changing the optical path difference (see wangchun, popbovin, he-dong-hui, a method for measuring the refractive index of transparent liquids based on michelson interferometer, optics 2012, volume 34, 1-4). The error source of the method is mainly reflected in the measurement of the angle. In addition, the efficiency and convenience of the measurement operation are also to be improved.
The utility model has the following contents:
to the above-mentioned defect that exists among the prior art, the utility model aims to provide a measure angle rotating device of liquid refracting index can realize quick, accurate liquid refracting index measurement through control rotation rate and rotation angle.
In order to achieve the above object, the utility model discloses measure angle rotary device of liquid refracting index, including rotary platform, cell, light string, the fixed pole of angle, micrometer caliper, cell among the device stews on rotary platform, and rotary platform passes through the light string with the micrometer caliper and is connected, and the small removal of micrometer caliper on the horizontal direction will "drive" rotary platform's slow rotation like this, and turned angle's size is realized through the fixed pole of angle.
The angle rotating device for measuring the liquid refractive index is placed in a light path of the Michelson interferometer (with the light path adjusted), and the stripes can be observed to continuously emerge or retract by adjusting the angle of the cuvette. The cuvette is indicated to be "perpendicular" to the incident light when the fringes change from emerging to receding (or from receding to emerging), i.e., the interference fringes emerge at a "critical point" with respect to receding. This time as the angular starting position of the optical rotary stage. The micrometer screw part is rotated, the rotating platform is driven by the light string to rotate slowly to the end position of the angle, so that the slow change of the interference fringes is realized, and the change number of the fringes is recorded. The horizontal displacement speed of the micrometer screw is controlled, so that the speed of the stripe change can be controlled, but the final stripe change number is unchanged. The angle starting position and the angle ending position are realized by two 'fixed angle round bars' on the rotating platform. That is, the angle change for each experiment is a certain value (θ).
In the angle rotating device for measuring the refractive index of the liquid, when the empty cuvette is tested, the rotating platform changes a determined angle (theta), and then the change number (delta K) of the stripes is recorded1). Multiple measurements, calculating Δ K1Average value of (a). Then, the cuvette is filled with the liquid to be measured, the same angle theta is changed, the change series of the stripes in the observation screen is recorded as delta K2. Multiple measurements, calculating Δ K2Average value of (a). Finally, the thickness (namely the distance between the two inner walls of the cuvette) t of the liquid in the cuvette is measured by using a formula
Obtaining the refractive index (n) of the liquid to be measured, wherein lambda is the wavelength of the laser.
The utility model discloses the advantage lies in the horizontal displacement through the micrometer caliper, "drives" rotary platform's rotation to realize "slow change" of optical path difference, the change of stripe can be observed with the naked eye completely. And the change speed of the stripes can be controlled by the horizontal displacement speed of the micrometer screw. In addition, the angle is controlled by two 'fixed angle round bars', so that the measurement of the angle at each time is avoided, the operation is simple, and the measurement speed and the measurement precision are improved.
Description of the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the light path before and after the cuvette rotates in the present invention;
in the figure: the device comprises a base 1, a rotary platform 2, a cuvette 3, a pointer 4, two round bars 5 (control angles), a light string 6, a connecting end of the string and the rotary platform 7, a thin rod 8 (changing the stretching direction of the string), a connecting end of the string and a micrometer screw 9 and a micrometer screw 10.
The specific implementation mode is as follows:
the angle rotating device for measuring the liquid refractive index according to the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model discloses measure angle rotary device of liquid refracting index to michelson interferometer is as experimental platform, and M1 (fixed), M2 (portable) are plane mirror, G1, G2 are beam splitter and compensating plate respectively, and the adjustment light path makes it take place laser interference to present clear, the interference fringe of fringe broad in observing the screen.
Placing an angle rotation device in an optical path of a Michelson interferometer as shown in figure 1, and standing a cuvette 3 on a rotary platform 2; one end 7 of the light string 6 is connected with the rotating platform 2, and the other end 9 is connected with a screw of the micrometer screw 10. The stretching direction of the string 6 is realized by a thin rod 8 (functioning as a fixed pulley) fixed on the base 1. The control of the rotation angle of the rotary platform 2 is achieved by the hands 4 mounted on the rotary platform 2, since the starting and ending positions of the hands 4 are controlled by two round bars 5 fixed on the base 1.
Firstly, the rotary platform 2 is rotated to the initial position of the round bar 5, the empty cuvette 3 is adjusted to see the 'critical point' of the stripe retraction and emergence on the observation screen, and the 'critical point' is determinedThe dot "is viewed as the cuvette 3 is now perpendicular to the path of the incident light, as is ray 11 in FIG. 2. The micrometer screw 10 is adjusted to drive the rotary platform 2 to rotate to the end position of the round bar 5, and the emergent light of the cuvette 3 is shown as light 12 in fig. 2. In this process, the cuvette is rotated through an angle θ and the number of levels of change of the corresponding interference fringes is recorded. The cursor 4 is moved so as to cause the rotary platform 2 to be retracted to the starting position, i.e. the starting position immediately next to the circular bar 5. Then repeating the above operations to obtain the average value of the interference fringe change series when the cuvette rotates by an angle theta, and recording the average value as delta K1。
Then, the cuvette is filled with the liquid to be measured, the same angle theta is changed, the change series of the stripes in the observation screen is recorded as delta K2. Multiple measurements, calculating Δ K2Average value of (a).
Finally, the thickness t of the liquid in the cuvette is measured by using a formula
Obtaining the refractive index (n) of the liquid to be measured, wherein lambda is the wavelength of the laser.
Claims (2)
1. The utility model provides a measure angle rotary device of liquid refracting index, includes rotary platform, cell, light string, the fixed pole of angle, micrometer screw, its characterized in that, cell among the device stews on rotary platform, and rotary platform passes through the light string with the micrometer screw to be connected, and the micro-removal of micrometer screw on the horizontal direction will "drive" rotary platform's slow rotation like this, and turned angle's size is realized through the fixed pole of angle, and rotary platform sets up between Michelson interferometer's plane reflection mirror M1 and spectroscope G1, and the micrometer screw is fixed on Michelson interferometer's platform.
2. The angle rotating apparatus for measuring refractive index of liquid according to claim 1, wherein the thickness t of the liquid in the cuvette is measured using the formula
And obtaining the refractive index of the liquid to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921862588.6U CN211652489U (en) | 2019-10-31 | 2019-10-31 | Angle rotating device for measuring liquid refractive index |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921862588.6U CN211652489U (en) | 2019-10-31 | 2019-10-31 | Angle rotating device for measuring liquid refractive index |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211652489U true CN211652489U (en) | 2020-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921862588.6U Active CN211652489U (en) | 2019-10-31 | 2019-10-31 | Angle rotating device for measuring liquid refractive index |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211652489U (en) |
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2019
- 2019-10-31 CN CN201921862588.6U patent/CN211652489U/en active Active
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