CN202119712U - System for measuring air refractive index - Google Patents
System for measuring air refractive index Download PDFInfo
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- CN202119712U CN202119712U CN2011201285005U CN201120128500U CN202119712U CN 202119712 U CN202119712 U CN 202119712U CN 2011201285005 U CN2011201285005 U CN 2011201285005U CN 201120128500 U CN201120128500 U CN 201120128500U CN 202119712 U CN202119712 U CN 202119712U
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- air
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- measuring system
- catoptron
- refraction measuring
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Abstract
The utility model discloses a system for measuring air refractive index, which comprises an optic interference imaging module, a pneumatic pump module, a picture signal acquisition and conversion module, a data acquisition and transmission module and an embedded system data processing module, wherein the pneumatic pump module is connected with the optic interference imaging module and is used for changing air pressure of the measured air; the picture signal acquisition and conversion module, the data acquisition and transmission module and the embedded system data processing module are sequentially connected; and the picture signal acquisition and conversion module is connected with the optic interference imaging module. By means of the system disclosed by the utility model, the interference fringe changing number caused by the change of the air pressure can be accurately and automatically measured so that the numerical value of the air refractive index is accurately measured.
Description
Technical field
The utility model relates to the measurement of air refraction, relates in particular to a kind of air refraction measuring system based on embedded system.
Background technology
Air refraction is the physical quantity of characterized medium optical characteristics.In medium analysis and many scientific research departments, all can run into the problems of measurement of air refraction, as: the measurement of high temp objects environment temperature field distribution, the aerodynamics analysis of aircraft etc.So it is very important can measuring air refraction accurately and rapidly.Existing general air refraction measuring system complicated operation, it is poor to adapt to rugged surroundings property, and precision is relatively low, is difficult to adapt to the new demand of high precision that current measuring technique proposes, intellectuality, hommization.
For this reason, there is report to adopt michelson interferometer measurement method, Edlen experimental formula method, phase-comparison method etc. to realize measurement to air refraction.
The Ma Xiufang of Fudan University has proposed to use the instrument of being made up of Michelson interferometer, sealed glass tube, air pressure and inflation leather bag to come the Measurement of Air refractive index in " Experiment of College Physics "; But its fringe count adopts the artificial counting method; The interference fringe that promptly changes with eye-observation, this method of counting very easily causes eye fatigue and influences the accuracy of reading.The Sun Linlin of Beijing Forestry University has proposed to utilize single-chip microcomputer at " based on the single chip computer measurement air refraction ", on the basis of Edlen experimental formula, is parameter with airborne temperature, relative humidity, atmospheric pressure, the method for Measurement of Air refractive index.The Tongliao of wooden herding institute has proposed to use the experimental provision of compositions such as rayleigh interferometer, sodium vapor lamp, pump bowl, pressure gauge to come the Measurement of Air refractive index in the wise man.Equally, its counting to interference fringe still adopts the method for human eye counting.Proposed a kind of among the Wang Huizai of Central South University " based on the research of phase-comparison method Measurement of Air refractive index " based on phase-comparison method; Principle according to THE VELOCITY OF SOUND IN AIR is measured through measuring wavelength, reaches the indirect measurement to air refraction; The problem that its experiment needs to solve mainly concentrates on above the precision of scale; The reading of dependence scale records the wavelength of IR wavelength, but the precision of scale is bigger to the influence of experimental result validity, to having relatively high expectations of experimental apparatus.The Li Dongguang of Beijing Institute of Technology has proposed in " method and the precision analysis of vacuum chamber Measurement of Air refractive index " with the method and apparatus that extracts sealed vacuum chamber Measurement of Air refractive index in advance; This method has adopted interfere measurement technique; Kept interferometric method Measurement of Air refractive index can reflect the characteristics that all cause the environmental factor of variations in refractive index; Equipment such as the vacuum pump that is used to bleed, vacuum gauge, valve have been simplified simultaneously; The interference that measurement brings when having avoided in measuring process, bleeding, but it is still the manual observation method in counting change of interference fringes value institute employing method is when number of interference fringes reaches the hundreds of bar when above; Cause people's kopiopia to cause counting to be made mistakes easily, and incompatible current measuring technique propose the trend of robotization.
Though said method has all been obtained certain effect, but still be difficult to adapt to the requirement of high precision that current measuring technique proposes, intellectuality, hommization.
The utility model content
To the shortcoming of prior art, the purpose of the utility model is to provide a kind of air refraction measuring system accurate, simple to operate of calculating.
To achieve these goals; The technical scheme of the utility model is: a kind of air refraction measuring system; Comprise optical interference image-forming module that forms interference fringe and the air lift pump module that is connected with the optical interference image-forming module; The air lift pump module is used for changing the air pressure of surveying, and comprises that also the picture signal that connects is successively caught and modular converter, data acquisition and transport module and embedded system data processing module, and said picture signal is caught with modular converter and is connected with the optical interference image-forming module.The optical interference image-forming module forms interference ring and images on the optical screen; Picture signal is caught with modular converter and is converted the interference ring light signal into electric signal; Data acquisition and transport module are digital signal with electrical signal conversion and are transferred to the embedded system data processing module that the embedded system data processing module receives from the digital signal of data acquisition transport module and to it and handles the automatic counting of realizing interference ring.
As a kind of preferred version; Said optical interference image-forming module includes Michelson interferometer and imaging screen; Said Michelson interferometer is provided with light source, lens, beam-splitter, first catoptron, compensating plate, second catoptron, imaging screen, and light source is after lens expand bundle, and light arrives beam-splitter with 45 ° of incident angles; The setting parallel to each other of beam-splitter and compensating plate, and beam-splitter, compensating plate all become 45 ° of angles to place with first catoptron with second catoptron; First catoptron and plane, second catoptron place are orthogonal, and the optical interference image-forming module utilizes Michelson interferometer to form interference ring and images on the imaging screen.
As a kind of preferred version, said air lift pump module comprises the glass air chamber and charges and discharge the air bag of gas to the glass air chamber, pushes the inflation leather bag to the inflation of glass air chamber, and the air pressure in the glass air chamber is increased.Said glass air chamber is connected with barometer, shows the air pressure of glass air chamber.
As a kind of preferred version; Said picture signal is caught with modular converter and is comprised optical lens and the ccd sensor that mutual light is connected; Said optical lens is connected with imaging screen light, and picture signal is caught the interference ring light signal that utilizes ccd sensor will come from imaging screen with modular converter and converted electric signal into.
As a kind of preferred version, said imaging screen and ccd sensor place in the shading case, not only can reduce the interference of outside natural light to experiment, and the line array CCD sensor acquisition also can be so that the contrast of light signal strengthens when catching interference fringe image.
As a kind of preferred version; Said data acquisition and transport module adopt the A/D data collecting card to carry out data acquisition, convert analog quantity into digital quantity through the A/D data collecting card, deliver to embedded system and carry out data processing; Thereby the counting of automatic recording interference fringe need not artificial reading.
The principle of work of the utility model is: be that air pressure in the glass air chamber of L is by standard atmospheric pressure p when length
3Change at 0 o'clock, refractive index just changes to 1 by n, and establishing the corresponding interference fringe variation number that is produced by interferometer is Δ m, and pressure change is designated as Δ p=p
1-p
2, the striped variation is designated as Δ m=m
1-m
2, then can obtain the measure equation that native system is measured air refraction:
λ is an optical maser wavelength in the formula; L is the length of glass air chamber; So the value of Measurement of Air refractive index only need confirm that it is that Δ m and pressure change Δ p get final product that striped changes number; And pressure change Δ p can be obtained by the barometer reading, and striped changes number Δ m and then calculates through the embedded system data processing module.
Compared with prior art, the utlity model has following advantage: the utility model can accurately, automatically be measured atmospheric pressure and change the interference fringe variation number that is caused, thereby has accurately measured the numerical value of air refraction.Compare existing air refraction measuring method, the utility model patent is simple to operation, and automatization level is high, and measuring accuracy is high, and system stability is reliable.
Description of drawings
Fig. 1 is the utility model structural representation block diagram;
Fig. 2 is the Michelson interferometer structural representation in the utility model;
Fig. 3 is the utility model structural representation;
Fig. 4 utilizes the interference ring of the utility model measurement and the linear fit figure of draught head.
Embodiment
Below in conjunction with accompanying drawing the utility model is carried out detailed description.
Like Fig. 1, shown in Figure 3; A kind of embedded air refraction measuring system of the utility model, it comprises that the optical interference image-forming module that has Michelson interferometer, the air lift pump module that has glass air chamber 3, the picture signal that has line array CCD sensor 5 catch and modular converter, data acquisition and transport module and embedded system data processing module.The air lift pump module is connected with Michelson interferometer; The optical interference image-forming module utilizes Michelson interferometer to form interference ring and images on the imaging screen 4 of optical interference image-forming module; Picture signal is caught with modular converter and is utilized optical lens 6 and ccd sensor 5 to convert the interference ring light signal into electric signal; Data acquisition and transport module will be digital signal from the electrical signal conversion of ccd sensor 5 through A/D data collecting card 7, and the embedded system data processing module receives from the digital signal of data acquisition and transport module and to it and handles the automatic counting of realizing interference ring.
As shown in Figure 2, this Michelson interferometer comprises first mirror M
1, second mirror M
2, beam-splitter G
1, compensating plate G
2, light source S.Make light source with the He-Ne laser instrument, through short focal length lens L
1Expand bundle, make and evenly illuminate Michelson interferometer, regulate first mirror M
1With second mirror M
2Vertically.The Ray Of Light that light source S sends is through beam-splitter G
1Be divided into first light 1 and second light, 2, the first light 1 vertically are mapped to mirror M
1After, Yan Yuanlu returns, and sees through beam-splitter G
1Arrive imaging screen 4, the second light 2 through compensating plate G
2After vertically be mapped to mirror M
2, then from mirror M
2Turn back to beam-splitter G along former road
1, and by beam-splitter G
1The half reflection film reflect light to and reach imaging screen 4.Such first light 1 and second light 2 are coherent lights, interference will occur when meeting in the space.
Imaging screen 4 places the bottom of a shading case, and line array CCD sensor 5 also places the shading case inner.It is one rectangular-shaped that this shading case is, and it has a light inlet window, not only can reduce the interference of outside natural light to experiment, and line array CCD sensor 5 gather also can be so that the contrast of light signal strengthens when catching interference fringe image.
For the Measurement of Air refractive index; On the smooth guide rail of Michelson interferometer, placing the length that links to each other with air lift pump is the seal glass air chamber 3 of L; Glass air chamber 3 is connected with air bag 9, and the rotary switch of air bag 9 is screwed, and presses pressuring gasbag 9 and inflates to the glass air chamber; Obtain the pressure change Δ p in the glass air chamber 3 by barometer 8 readings, calculate striped through the embedded system data processing module and change number Δ m.By formula:
λ is an optical maser wavelength in the formula, and L is the length of glass air chamber, p
3Be standard atmospheric pressure, can calculate the value of air refraction.
Experimental data for adopting the embedded air refraction measuring system of the utility model repeatedly to measure as shown in the table:
And above-mentioned data are depicted as linear fit figure, and as shown in Figure 4, show that by experimental data and fitted figure this measuring results is accurate and precision is high.
Above embodiment only is used to explain the technical scheme of the utility model, but not to its restriction; Although the utility model has been carried out detailed explanation with reference to preferred embodiment; The those of ordinary skill in affiliated field is to be understood that; Still can make amendment and perhaps the part technical characterictic is equal to replacement the embodiment of the utility model; And not breaking away from the spirit of the utility model technical scheme, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (7)
1. air refraction measuring system; Comprise optical interference image-forming module that forms interference fringe and the air lift pump module that is connected with the optical interference image-forming module; The air lift pump module is used for changing the air pressure of surveying; It is characterized in that comprise that also the picture signal that connects is successively caught and modular converter, data acquisition and transport module and embedded system data processing module, said picture signal is caught with modular converter and is connected with the optical interference image-forming module.
2. air refraction measuring system according to claim 1 is characterized in that, said optical interference image-forming module includes Michelson interferometer and imaging screen (4), said Michelson interferometer be provided with light source (
), lens (L
1), beam-splitter (
), first catoptron (
), compensating plate (
), second catoptron (
), imaging screen (4), light source (
) through lens (L
1) expand bundle after, light with 45 ° of incident angles arrive beam-splitters (
), beam-splitter (
) and compensating plate (
) setting parallel to each other, and beam-splitter (
), compensating plate (
) all with first catoptron (
) and second catoptron (
) become 45 ° of angles to place; First catoptron (
) and second catoptron (
) place plane orthogonal.
3. air refraction measuring system according to claim 1 is characterized in that, said air lift pump module comprises glass air chamber (3) and charges and discharge the air bag (9) of gas to the glass air chamber.
4. air refraction measuring system according to claim 3 is characterized in that, said glass air chamber (3) is connected with barometer (8).
5. air refraction measuring system according to claim 2 is characterized in that, picture signal is caught with modular converter and comprised optical lens (6) and the ccd sensor (5) that mutual light is connected, and said optical lens (6) is connected with imaging screen (4) light.
6. air refraction measuring system according to claim 5 is characterized in that, said imaging screen (4) and ccd sensor (5) place in the shading case.
7. air refraction measuring system according to claim 1 is characterized in that, said data acquisition and transport module adopt A/D data collecting card (7) to carry out data acquisition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201285005U CN202119712U (en) | 2011-04-27 | 2011-04-27 | System for measuring air refractive index |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201285005U CN202119712U (en) | 2011-04-27 | 2011-04-27 | System for measuring air refractive index |
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| Publication Number | Publication Date |
|---|---|
| CN202119712U true CN202119712U (en) | 2012-01-18 |
Family
ID=45460767
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201285005U Expired - Fee Related CN202119712U (en) | 2011-04-27 | 2011-04-27 | System for measuring air refractive index |
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|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558185A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Method and device for measuring refractive index of gas |
| CN106226269A (en) * | 2016-07-07 | 2016-12-14 | 天津大学 | A kind of high accuracy air refraction is measured indirectly, wireless transmission system and method thereof |
| CN106871797A (en) * | 2017-01-07 | 2017-06-20 | 四川大学 | Contactless thickness of sample measuring method and measurement apparatus based on Michelson Interference Principle |
| CN107339931A (en) * | 2017-06-29 | 2017-11-10 | 安徽皖仪科技股份有限公司 | Air pressure adjustment without motion part interferometer |
| CN108426858A (en) * | 2018-03-23 | 2018-08-21 | 岭南师范学院 | A kind of air refraction gradiometry system |
-
2011
- 2011-04-27 CN CN2011201285005U patent/CN202119712U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558185A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Method and device for measuring refractive index of gas |
| CN103558185B (en) * | 2013-10-23 | 2016-01-20 | 国家电网公司 | The method and apparatus of measurement gas refractive index |
| CN106226269A (en) * | 2016-07-07 | 2016-12-14 | 天津大学 | A kind of high accuracy air refraction is measured indirectly, wireless transmission system and method thereof |
| CN106226269B (en) * | 2016-07-07 | 2019-05-14 | 天津大学 | A kind of high-precision air refraction measures indirectly, wireless transmission system and its method |
| CN106871797A (en) * | 2017-01-07 | 2017-06-20 | 四川大学 | Contactless thickness of sample measuring method and measurement apparatus based on Michelson Interference Principle |
| CN106871797B (en) * | 2017-01-07 | 2023-03-10 | 四川大学 | Non-contact sample thickness measuring method and measuring device based on Michelson interference principle |
| CN107339931A (en) * | 2017-06-29 | 2017-11-10 | 安徽皖仪科技股份有限公司 | Air pressure adjustment without motion part interferometer |
| CN107339931B (en) * | 2017-06-29 | 2019-04-16 | 安徽皖仪科技股份有限公司 | Air pressure adjustment without motion part interferometer |
| CN108426858A (en) * | 2018-03-23 | 2018-08-21 | 岭南师范学院 | A kind of air refraction gradiometry system |
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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: 20120118 Termination date: 20140427 |