CN201868012U - Demonstrator for measuring refractive index of solid and Brewster angle - Google Patents
Demonstrator for measuring refractive index of solid and Brewster angle Download PDFInfo
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- CN201868012U CN201868012U CN2009202829610U CN200920282961U CN201868012U CN 201868012 U CN201868012 U CN 201868012U CN 2009202829610 U CN2009202829610 U CN 2009202829610U CN 200920282961 U CN200920282961 U CN 200920282961U CN 201868012 U CN201868012 U CN 201868012U
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- rotating shaft
- optical bench
- demonstrator
- wheel
- refractive index
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Abstract
A demonstrator for measuring refractive index of a solid and Brewster angle belongs to the technical field of a physical measurement and demonstration experimental instrument. The demonstrator is provided with a light-spot synchronous tracking device consisting of a 2:1 decelerating transmission system. The device is equipped with a big wheel. A rotating shaft of the big wheel is connected with a movable arm on an optical bench through a supporting plate. The rotating shaft and the movable arm can rotate around a rotating shaft of the optical bench. The rotating shaft of the optical bench is fixed with a small wheel, and the big wheel and the small wheel are in transmission through a belt or a gear. The demonstrator has the beneficial effects that the experiment of measuring the refractive index of the solid and the Brewster angle is quite convenient.
Description
Affiliated technical field
A kind of solid refractive index and Brewster angle are measured demonstrator, and its technical field is a kind of physical measurement and demonstration test instrument.
Background technology
The general Brewster angle experimental apparatus of existing measurement solid refractive index because the adjustment between the angle of incidence of light of surface to be measured and the reflection angle that reflexes to optical screen generally must armrest be moving adjusts, be difficult for synchronous, so test cumbersome.
Summary of the invention
For overcoming the trouble of above-mentioned general Brewster angle experimental apparatus experimental implementation inconvenience, the luminous point synchronous follow-up device that the gearing-down system by 2: 1 that it is unique that the utility model provides a cover constitutes, no matter the light that sends from light source from what direction is incided on the surface to be measured, the luminous point of reflection is the optical screen on the alignment activity arm all the time, thereby realize synchronous tracking measurement, make the experiment of measuring solid refractive index and Brewster angle become very convenient luminous point.
The technical scheme that its technical matters that solves the utility model adopts is: according to two diameter ratios is 2: 1 power wheel, and the rotation ratio of its ratio of gear and angle should be 1: 2; And, light is followed reflection law to the reflection on plane, it is the principle that incident angle equals reflection angle forever, design the luminous point synchronous follow-up device that a gearing-down system of 2: 1 constitutes, make light equal half of angle between the lever arm at optical screen place and incident ray all the time for the incident angle of surface to be measured, can realize optical screen to reflection light point synchronously from motion tracking.For this reason, we communicate the rotating shaft of the bull wheel of this deceleration system by the lever arm on back up pad and the optical bench, and they can be rotated around the rotating shaft of optical bench together, carry out transmission by belt or gear between bull wheel and the steamboat, the diameter ratio of bull wheel and steamboat is 2: 1, steamboat is fixed in the rotating shaft of optical bench and can not rotates because the effect of gearing-down, the angle that the bull wheel on the lever arm rotates be lever arm turn over angle 1/2.In addition, big power wheel such as one is respectively arranged at bull wheel top on the lever arm and optical bench rotating shaft top, the power wheel on optical bench rotating shaft top is fixed with index dial and eyeglass folder again coaxially, the bull wheel on the lever arm and the power wheel on its top rotate synchronously as one, though and the power wheel on optical bench rotating shaft top and following steamboat are coaxial, but be independent rotation.So, when the lever arm on the optical bench rotates a certain angle, behind the belt or gear drive by 2: 1 gearing-down systems, make the eyeglass folder on the optical bench rotating shaft top that is in correspondingly to turn over 1/2 of this angle, and angle equals two times to the eyeglass incident angle of the light that sends from optical bench one end light source just between the lever arm at optical screen place and incident ray, thus realize optical screen to reflection light point synchronously from motion tracking.
This instrument calculates that according to the mensuration of Brewster angle the principle of solid refractive index is as follows:
Natural light reflects on medium interface and when reflecting, reflected light and refract light all are partial poolarized lights generally speaking, have only when incident angle during for certain specific angle reflected light be only linearly polarized light, its vibration plane is vertical with the plane of incidence, this specific angle is called Brewster angle, usefulness
Expression.This rule is called Brewster.Be formulated as:
N ' is the relative index of refraction of solid in the formula, so recorded the relative index of refraction n ' that Brewster angle just can be extrapolated solid dielectric, this all is highly significant on scientific research and engineering.
When using this instrument to measure, allow the semiconductor laser that is fixed on optical bench one end launch a branch of ordinary ray, pass a polarizer, suitably adjust polarizer, making what come out from polarizer is the linearly polarized light parallel with the plane of incidence, and directive plane to be measured then is by reflection, get at last on the optical screen, bright spot occurs.Be rotatablely equipped with the lever arm of optical screen (by the synchronous autotracker of distinctive 2: 1 luminous point of this instrument, luminous point can be aimed at optical screen all the time this moment.), when by chance forwarding a certain angle to, according to Brewster's law, the linearly polarized light vertical with the plane of incidence (and no longer can reflect original linearly polarized light that come out from polarizer, parallel with the plane of incidence) can only be reflected in plane to be measured this moment, so reflection ray disappears, bright spot also disappears immediately on the optical screen, and the incident angle that the light of this moment is treated lining face is a Brewster angle.According to the incident angle of light of reading on the index dial, can calculate the relative index of refraction of this solid dielectric to be measured by top formula.
The beneficial effects of the utility model are, novel solid refractive index and Brewster angle are measured demonstrator and had that compact conformation, manufacturing cost are low, the advantage of easy operation.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the schematic perspective view of this instrument.
In Fig. 1,1. optical bench, 2. the lever arm on the optical bench, 3. the rotating shaft on the optical bench (is only indicated the position among Fig. 1, cannot see but be blocked), 4. 3 of optical bench legs, the 7. bull wheel on the lever arm, 8. the bearing at bull wheel middle part (is only indicated the position among Fig. 1, cannot see but be blocked), 12. index dial and eyeglass folder, 13. surfaces to be measured, the pointer of 14. indicating graduations, 15. semiconductor laser, 16. polarizer, 19. support the back up pad (lever arm by screw and optical bench is connected) of bull wheel middle part bearing and steamboat middle part bearing, 20. optical screens.
Fig. 2 is the phantom view of this instrument, can further do illustrating to the details that does not fully reflect of some the gearing-down systems among Fig. 1, and in Fig. 1 and Fig. 2, the label of same parts is identical.
In Fig. 2: 1. optical bench, 2. the lever arm on the optical bench, 3. the rotating shaft of optical bench, 4. 3 of optical bench legs, 5. be fixed on the steamboat in the optical bench rotating shaft, 6. the driving belt between steamboat and bull wheel, 7. the bull wheel on the lever arm, its top is connecting another power wheel coaxially, and there is a bearing (8) at its middle part, is supported on the back up pad (19), 8. the bearing at bull wheel middle part, 9. the driving belt that connects the power wheel on the power wheel on bull wheel top and optical bench rotating shaft top, the 10. power wheel on optical bench rotating shaft top, 11. are supported on the bearing in the optical bench rotating shaft, 12. index dial and eyeglass folder, 13. surface to be measured, 15. semiconductor lasers, 16. polarizers, 17. the light beam that from laser instrument, penetrates, 18. the support of laser instrument and polarizer, 19. support the back up pad (lever arm by screw and optical bench is connected) of bull wheel middle part bearing and steamboat middle part bearing, 20. optical screens.
Embodiment
Lever arm on optical bench (2) can drive back up pad (19), bull wheel (7) rotates around the rotating shaft (3) of optical bench together, because of the diameter ratio of bull wheel (7) and steamboat (5) is 2: 1, steamboat is fixed in the optical bench rotating shaft and can not rotates, so when lever arm turns over a certain angle, after belt (6) transmission, bull wheel (7) can only turn over 1/2 of this angle, and the power wheel on bull wheel top is identical with the diameter of the power wheel (10) on optical bench rotating shaft top, transmission through belt, the power wheel (10) on optical bench rotating shaft top also turns over 1/2 of this angle, (though the power wheel on optical bench rotating shaft top and following steamboat be coaxial, but be independent rotation).Again because index dial and eyeglass folder (12) and surface to be measured (13) are power wheels (10) with optical bench top to be fixed together, thus the angle that final surface to be measured (13) turns over also is a lever arm turn over angle 1/2.Like this, our this device has just guaranteed incident ray to 1: 2 relation between the incident angle of surface to be measured and the angle between reflection ray and incident ray, makes the optical screen on the lever arm all the time can be to the synchronous tracking measurement of luminous point.
Claims (3)
1. solid refractive index and Brewster angle are measured demonstrator, it is characterized in that: the luminous point synchronous follow-up device of a cover by 2: 1 gearing-down system formation arranged on this instrument, this device has a bull wheel, the rotating shaft of bull wheel is communicated by the lever arm on back up pad and the optical bench, and they can be rotated around the rotating shaft of optical bench together, in the optical bench rotating shaft, be fixed with a steamboat, carry out transmission by belt or gear between bull wheel and the steamboat.
2. solid refractive index according to claim 1 and Brewster angle are measured demonstrator, it is characterized in that: the bull wheel in the luminous point synchronous follow-up device that 2: 1 of this instrument gearing-down system constitutes on the lever arm and the diameter ratio of the steamboat in the optical bench rotating shaft are 2: 1, and steamboat is fixed in the rotating shaft of optical bench and can not rotates.
3. solid refractive index according to claim 1 and Brewster angle are measured demonstrator, it is characterized in that: big power wheel such as is respectively arranged at bull wheel top in the luminous point synchronous follow-up device that 2: 1 of this instrument gearing-down system constitutes on the lever arm and optical bench rotating shaft top, and the power wheel on optical bench rotating shaft top is fixed with the eyeglass folder coaxially, the bull wheel on the lever arm and the power wheel on its top rotate synchronously as one, though and the power wheel on optical bench rotating shaft top and following steamboat are coaxial, but be independent rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202829610U CN201868012U (en) | 2009-12-22 | 2009-12-22 | Demonstrator for measuring refractive index of solid and Brewster angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202829610U CN201868012U (en) | 2009-12-22 | 2009-12-22 | Demonstrator for measuring refractive index of solid and Brewster angle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201868012U true CN201868012U (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202829610U Expired - Fee Related CN201868012U (en) | 2009-12-22 | 2009-12-22 | Demonstrator for measuring refractive index of solid and Brewster angle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201868012U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632593A (en) * | 2013-12-02 | 2014-03-12 | 南京化工职业技术学院 | Brewster law demonstrating and refractive index measuring instrument |
| CN105869493A (en) * | 2016-06-20 | 2016-08-17 | 江南大学 | Combined type rotatable optical bench |
| CN105957430A (en) * | 2016-07-02 | 2016-09-21 | 北京工业大学 | Bicolor linearly-polarized light Brewster's law demonstration instrument |
| CN106501279A (en) * | 2016-12-02 | 2017-03-15 | 中国兵器科学研究院宁波分院 | A kind of low sub-surface damage detection method of firmly crisp optical material |
| CN106979935A (en) * | 2017-03-14 | 2017-07-25 | 浙江大学 | A kind of contactless glass block refractive index measuring instrument |
| CN107331264A (en) * | 2017-09-11 | 2017-11-07 | 董逸翔 | Bevel gear reflected refraction is polarized Teaching instrument |
| CN108318451A (en) * | 2018-05-07 | 2018-07-24 | 中国计量大学 | A kind of solid material refractive index measuring instrument from motion tracking reflection light |
| CN109580182A (en) * | 2018-12-18 | 2019-04-05 | 北京理工大学 | Curved optical device refractive index measurement method and device based on Brewster's law |
| CN110779693A (en) * | 2019-11-11 | 2020-02-11 | 四川大学 | Method for measuring refractive index of double-prism material |
-
2009
- 2009-12-22 CN CN2009202829610U patent/CN201868012U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632593A (en) * | 2013-12-02 | 2014-03-12 | 南京化工职业技术学院 | Brewster law demonstrating and refractive index measuring instrument |
| CN103632593B (en) * | 2013-12-02 | 2015-09-30 | 南京化工职业技术学院 | A kind of Brewster's law demonstration, refractive index measuring instrument |
| CN105869493A (en) * | 2016-06-20 | 2016-08-17 | 江南大学 | Combined type rotatable optical bench |
| CN105957430A (en) * | 2016-07-02 | 2016-09-21 | 北京工业大学 | Bicolor linearly-polarized light Brewster's law demonstration instrument |
| CN106501279A (en) * | 2016-12-02 | 2017-03-15 | 中国兵器科学研究院宁波分院 | A kind of low sub-surface damage detection method of firmly crisp optical material |
| CN106979935B (en) * | 2017-03-14 | 2019-07-09 | 浙江大学 | A kind of contactless glass block refractive index measuring instrument |
| CN106979935A (en) * | 2017-03-14 | 2017-07-25 | 浙江大学 | A kind of contactless glass block refractive index measuring instrument |
| CN107331264A (en) * | 2017-09-11 | 2017-11-07 | 董逸翔 | Bevel gear reflected refraction is polarized Teaching instrument |
| CN107331264B (en) * | 2017-09-11 | 2022-11-15 | 董逸翔 | Bevel gear reflection and refraction polarization demonstrator |
| CN108318451A (en) * | 2018-05-07 | 2018-07-24 | 中国计量大学 | A kind of solid material refractive index measuring instrument from motion tracking reflection light |
| CN109580182A (en) * | 2018-12-18 | 2019-04-05 | 北京理工大学 | Curved optical device refractive index measurement method and device based on Brewster's law |
| CN109580182B (en) * | 2018-12-18 | 2020-07-31 | 北京理工大学 | Method and device for measuring refractive index of curved optical element based on Brewster's law |
| CN110779693A (en) * | 2019-11-11 | 2020-02-11 | 四川大学 | Method for measuring refractive index of double-prism material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20111222 |