CN108426858A - A kind of air refraction gradiometry system - Google Patents
A kind of air refraction gradiometry system Download PDFInfo
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- CN108426858A CN108426858A CN201810244549.3A CN201810244549A CN108426858A CN 108426858 A CN108426858 A CN 108426858A CN 201810244549 A CN201810244549 A CN 201810244549A CN 108426858 A CN108426858 A CN 108426858A
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- convex lens
- light
- gas chamber
- glass gas
- air refraction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention discloses a kind of air refraction gradiometry system, including LED light, glass gas chamber and shading case, first convex lens and the second convex lens are set on glass gas chamber, light inlet window is arranged in shading case, the setting edge of a knife and CCD in shading case, the light that LED light is sent out becomes directional light after the first convex lens, and collimated light beam is irradiated to after glass gas chamber on the second convex lens, and directional light is by the second convex lens post-concentration in focal point；When changing the pressure in glass gas chamber, air agitation in glass gas chamber, directional light is by being no longer directional light when glass gas chamber, light can be segregated, and light passes through the second convex lens, and some light no longer converges at focal point, the edge of a knife in shading case intercepts the light of certain frequency spectrum, different schlieren images is obtained, the comparison by computer to schlieren image obtains air refraction gradient.
Description
Technical field
The present invention relates to refractometry technical fields, more particularly to a kind of air refraction gradiometry system.
Background technology
Refractive index is the spread speed of light in a vacuum and the ratio between the spread speed of light in the medium, the refractive index of material
It is higher, keep the ability that incident light reflects stronger.In physical world, refractive index is to pass through eyes or video camera institute by light
Transparent material and medium when relative velocity produced by, usually it is related with the density of object；Refractive index is higher, object
Density is higher.
Air refraction is the physical quantity for characterizing Medium Optics characteristic, and air refraction can change with air condition,
Many research fields have important reference value.In traditional measuring device of refraction index of air, by Michelson's interferometer, close
The instrument of glass tube, air pressure and inflation leather bag composition is sealed to measure air refraction, the principle of Michelson interferometer is a branch of
Incident light is respectively reflected by corresponding plane mirror after spectroscope is divided into two bundles because this two-beam frequency is identical, shakes
Dynamic direction is identical and constant phase difference (meeting interference condition), so can interfere.Two-beam does not share the same light in interference
Journey can interfere arm lengths and the refractive index of change medium to be realized by adjusting, so as to form different interference patterns
Sample.But the method for above-mentioned measurement air refraction uses artificial counting method, i.e. the interference item of the eyes observation variation of employment
Line, this method of counting easily cause eye fatigue and influence reading accuracy, and this operating system it is complex, can
Adaptation adverse circumstances are poor, accuracy is relatively low.
Therefore, how to change measure in the prior art air refraction method is inconvenient, measurement result precision is not smart
Accurate present situation, is those skilled in the art's urgent problem to be solved.
Invention content
The object of the present invention is to provide a kind of air refraction gradiometry systems, above-mentioned of the existing technology to solve
Problem simplifies air refraction measurement process, keeps measurement result more accurate.
To achieve the above object, the present invention provides following schemes：The present invention provides a kind of air refraction gradiometry
System, including it is of a straight line type the LED light set gradually, glass gas chamber and shading case, the first convex lens is set on the glass gas chamber
Mirror and the second convex lens, first convex lens are set between the LED light and second convex lens, the LED light
Height is corresponding with first convex lens and the focus of the second convex lens, first convex lens and the second convex lens it
Between candle is set, the height of the candle and the height of first convex lens and the second convex lens match, the glass gas
Room is sealing structure, and sensor is arranged in the glass gas chamber, and the glass gas chamber is also associated with pulsometer；
The shading case is made of shading material, and light inlet window is arranged close to second convex lens side in the shading case,
The height of the light inlet window is corresponding with the height of the second convex lens, the setting edge of a knife and CCD (charge couplings in the shading case
Clutch part), the edge of a knife is disposed in proximity to the light inlet window side and can intercept the light entered by the light inlet window, described
The height of the edge of a knife and the CCD are consistent；
The CCD is also associated with image pick-up card, and the sensor is connected with microcontroller, the microcontroller and described image
Capture card is connected with computer.
Preferably, lamp bracket is arranged in the LED light, and the lamp bracket is set to the lower part of the LED light, the LED light and institute
The first convex lens is stated to be oppositely arranged.
Preferably, the glass gas chamber is detachable structure, and the glass gas chamber is rectangular parallelepiped structure, the glass gas chamber
Including shell and upper cover, first convex lens and second convex lens are respectively arranged at two opposite sides of the shell
On face, the shell is connected with the upper cover by hinge, and seal trim strip is arranged between the shell and the upper cover.
Preferably, pallet is set in the shell, and the candle is set in the pallet.
Preferably, the glass gas chamber is connected by rubber hose with the pulsometer.
Preferably, the shading case is rectangular parallelepiped structure, and the shading case is Demountable and is opened using drawing and pulling type
Close structure.
Preferably, the edge of a knife and the CCD are respectively provided with collet, and the edge of a knife and the CCD are removable with the collet
Load connects.
Preferably, the microcontroller and described image capture card are connected by wireless transmitter with the computer.
The present invention achieves following technique effect compared with the existing technology：The air refraction gradiometry system of the present invention
System, including is of a straight line type the LED light set gradually, glass gas chamber and shading case, and the first convex lens and the are arranged on glass gas chamber
Two convex lenses, the first convex lens are set between LED light and the second convex lens, the height of LED light and the first convex lens and second
The focus of convex lens is corresponding, and candle, the height of candle and the first convex lens are arranged between the first convex lens and the second convex lens
Match with the height of the second convex lens, glass gas chamber is sealing structure, sensor is arranged in glass gas chamber, glass gas chamber also connects
It is connected to pulsometer；Shading case is made of shading material, and light inlet window, the height of light inlet window is arranged close to the second convex lens side in shading case
Degree is corresponding with the height of the second convex lens, and the setting edge of a knife and CCD (charge coupling device) in shading case, the edge of a knife is disposed in proximity to
Light inlet window side simultaneously can intercept the light entered by light inlet window, and the height of the edge of a knife and CCD are consistent；CCD is also associated with image
Capture card, sensor are connected with microcontroller, and microcontroller and image pick-up card are connected with computer.The light that LED light is sent out passes through
Become directional light after first convex lens, collimated light beam is irradiated to after glass gas chamber on the second convex lens, and directional light is by the
Two convex lens post-concentrations are in focal point；When changing the pressure in glass gas chamber, the air agitation in glass gas chamber, directional light leads to
No longer it is directional light when crossing glass gas chamber, light can be segregated, and light passes through the second convex lens, and some light no longer converges at
Focal point, the edge of a knife in shading case intercept the light of certain frequency spectrum, different schlieren images are obtained, by computer to schlieren figure
The comparison of picture obtains air refraction gradient.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the overall structure diagram of the air refraction gradiometry system of the present invention；
Wherein, 1 is LED light, and 2 be the first convex lens, and 3 be glass gas chamber, and 4 be rubber hose, and 5 be pulsometer, and 6 be wax
Candle, 7 be sensor, and 8 be the second convex lens, and 9 be microcontroller, and 10 be the edge of a knife, and 11 be CCD, and 12 be image pick-up card, and 13 be calculating
Machine.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of air refraction gradiometry systems, above-mentioned of the existing technology to solve
Problem simplifies air refraction measurement process, keeps measurement result more accurate.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Referring to FIG. 1, Fig. 1 is the overall structure diagram of the air refraction gradiometry system of the present invention.
The present invention provides a kind of air refraction gradiometry system, including is of a straight line type the LED light 1 set gradually, glass
The first convex lens 2 and the second convex lens 8 is arranged on glass gas chamber 3 in glass gas chamber 3 and shading case, and the first convex lens 2 is set to LED
Between lamp 1 and the second convex lens 8, the height of LED light 1 is corresponding with the focus of the first convex lens 2 and the second convex lens 8, and first
Candle 6, the height of the height of candle 6 and the first convex lens 2 and the second convex lens 8 are set between convex lens 2 and the second convex lens 8
Match, glass gas chamber 3 is sealing structure, sensor 7 is arranged in glass gas chamber 3, glass gas chamber 3 is also associated with pulsometer 5；It hides
Light box is made of shading material, and light inlet window, the height of light inlet window and the second convex lens is arranged close to 8 side of the second convex lens in shading case
The height of mirror 8 is corresponding, and the setting edge of a knife 10 and CCD11 (charge coupling device), the edge of a knife 10 are disposed in proximity to entering light in shading case
Window side simultaneously can intercept the light entered by light inlet window, and the edge of a knife 10 is consistent with the height of CCD11；CCD11 is also associated with figure
As capture card 12, sensor 7 is connected with microcontroller 9, and microcontroller 9 and image pick-up card 12 are connected with computer 13.
When the air refraction gradiometry system work of the present invention, the light that LED light 1 is sent out is after the first convex lens 2
Become directional light, collimated light beam is irradiated to after glass gas chamber 3 on second convex lens 8, and directional light is after the second convex lens 8
Converge at focal point；When changing the pressure in glass gas chamber 3, the air agitation in glass gas chamber 3, directional light passes through glass gas
No longer it is directional light when room 3, light can be segregated, and light passes through the second convex lens 8, and some light no longer converges at focus
Locate, the edge of a knife 10 in shading case intercepts the light of certain frequency spectrum, obtains different schlieren images.
LED light 1, the first convex lens 2, candle 6, the second convex lens 8, the edge of a knife 10 and CCD11 constitute schlieren imaging system, gas
Press pump 5 can change the air pressure in glass gas chamber 3, and connecting microcontroller 9 by sensor 7 converts electrical signals into digital signal,
The temperature and pressure in glass gas chamber 3 are obtained on computer 13, according to Edlen formula：
Wherein, x is the change of carbon dioxide content, and σ is wave number, and unit is μm-1, t is temperature, and unit is DEG C that P is pressure
By force, unit Pa.
The different air refractions calculated under different temperatures pressure are calculated, according to schlieren imaging system, record is different
Schlieren image under temperature pressure, schlieren image and air refraction is corresponding.By the comparison to schlieren image, obtain
Go out air refraction gradient.The measuring system of the air refraction gradient of the invention utilizes stration technique, air refraction and
Schlieren image connects, and makes the air refraction gradient visualization of gained, simplifies measurement process, the analysis pair of simultaneous computer 13
Than improving measurement accuracy.
Wherein, lamp bracket is arranged in LED light 1, can make the coke of the first convex lens 2 of alignment of LED light 1 by adjusting the height of lamp bracket
Point, lamp bracket are set to the lower part of LED light 1, and LED light 1 is oppositely arranged with the first convex lens 2.
Candle 6 is put into glass gas chamber 3 for convenience, glass gas chamber 3 is detachable structure, and glass gas chamber 3 is rectangular
Body structure, glass gas chamber 3 include shell and upper cover, and the first convex lens 2 and the second convex lens 8 are respectively arranged at the opposite of shell
On two sides, shell is connected with upper cover by hinge, and seal trim strip is arranged between shell and upper cover.
Specifically, candle 6 is easy to get, of low cost, and pallet is arranged in shell, and candle is set in pallet, makes candle
It places firm.
In addition, glass gas chamber 3 is connected by rubber hose 4 with pulsometer 5.
More specifically, shading case is rectangular parallelepiped structure, shading case is made of shading material, and light inlet window is arranged, and reduces external
Natural light interferes measurement process；Shading case is Demountable and uses drawing and pulling type opening-closing structure, facilitates the edge of a knife 10
It is dismounted with CCD11.
Further, the edge of a knife 10 and CCD11 are respectively provided with collet, the edge of a knife 10 and CCD11 with the dismantled and assembled connection of collet, collet
It is height-adjustable, improve stability and the flexibility of the edge of a knife 10 and CCD11.
Further, microcontroller 9 and image pick-up card 12 can also enough pass through wireless transmitter and 13 phase of computer
Even, flexibility and the adaptability of system entirety are improved.
When the air refraction gradiometry system work of the present invention, the light that LED light 1 is sent out is after the first convex lens 2
Become directional light, collimated light beam is irradiated to after glass gas chamber 3 on second convex lens 8, and directional light is after the second convex lens 8
Converge at focal point；When changing the pressure in glass gas chamber 3, the air agitation in glass gas chamber 3, directional light passes through glass gas
No longer it is directional light when room 3, light can be segregated, and light passes through the second convex lens 8, and some light no longer converges at focus
Locate, the edge of a knife 10 in shading case intercepts the light of certain frequency spectrum, different schlieren images is obtained, by computer 13 to schlieren figure
The comparison of picture obtains air refraction gradient.
Specific case is applied in the present invention, and principle and implementation of the present invention are described, above example
Illustrate the method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, according to
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (8)
1. a kind of air refraction gradiometry system, it is characterised in that：Including being of a straight line type the LED light set gradually, glass
The first convex lens and the second convex lens is arranged on the glass gas chamber in gas chamber and shading case, and first convex lens is set to institute
It states between LED light and second convex lens, the height of the LED light and first convex lens and second convex lens
Focus is corresponding, is arranged candle between first convex lens and the second convex lens, the height of the candle and described first convex
The height of lens and the second convex lens matches, and the glass gas chamber is sealing structure, and sensor is arranged in the glass gas chamber,
The glass gas chamber is also associated with pulsometer；
The shading case is made of shading material, and light inlet window is arranged close to second convex lens side in the shading case, described
The height of light inlet window is corresponding with the height of the second convex lens, the setting edge of a knife and CCD (charge-coupled devices in the shading case
Part), the edge of a knife is disposed in proximity to the light inlet window side and can intercept the light entered by the light inlet window, the edge of a knife
It is consistent with the height of the CCD；
The CCD is also associated with image pick-up card, and the sensor is connected with microcontroller, the microcontroller and described image acquisition
Card is connected with computer.
2. air refraction gradiometry system according to claim 1, it is characterised in that：Lamp bracket is arranged in the LED light,
The lamp bracket is set to the lower part of the LED light, and the LED light is oppositely arranged with first convex lens.
3. air refraction gradiometry system according to claim 1, it is characterised in that：The glass gas chamber is removable
Unload structure, the glass gas chamber is rectangular parallelepiped structure, and the glass gas chamber includes shell and upper cover, first convex lens and institute
It states the second convex lens to be respectively arranged on two opposite sides of the shell, the shell passes through hinge phase with the upper cover
Even, seal trim strip is set between the shell and the upper cover.
4. air refraction gradiometry system according to claim 3, it is characterised in that：Setting support in the shell
Disk, the candle are set in the pallet.
5. air refraction gradiometry system according to claim 4, it is characterised in that：The glass gas chamber passes through rubber
Glue hose is connected with the pulsometer.
6. air refraction gradiometry system according to claim 1, it is characterised in that：The shading case is cuboid
Structure, the shading case are Demountable and use drawing and pulling type opening-closing structure.
7. air refraction gradiometry system according to claim 6, it is characterised in that：The edge of a knife and the CCD
Be respectively provided with collet, the edge of a knife and the CCD with the dismantled and assembled connection of the collet.
8. air refraction gradiometry system according to claim 1, it is characterised in that：The microcontroller and the figure
As capture card is connected by wireless transmitter with the computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810244549.3A CN108426858A (en) | 2018-03-23 | 2018-03-23 | A kind of air refraction gradiometry system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810244549.3A CN108426858A (en) | 2018-03-23 | 2018-03-23 | A kind of air refraction gradiometry system |
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| CN108426858A true CN108426858A (en) | 2018-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810244549.3A Pending CN108426858A (en) | 2018-03-23 | 2018-03-23 | A kind of air refraction gradiometry system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202119712U (en) * | 2011-04-27 | 2012-01-18 | 广东外语外贸大学 | System for measuring air refractive index |
| CN103558185A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Method and device for measuring refractive index of gas |
| CN104931224A (en) * | 2015-06-16 | 2015-09-23 | 哈尔滨工业大学 | Device and method used for observing air flow field structure in environment of different degrees of vacuum |
-
2018
- 2018-03-23 CN CN201810244549.3A patent/CN108426858A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202119712U (en) * | 2011-04-27 | 2012-01-18 | 广东外语外贸大学 | System for measuring air refractive index |
| CN103558185A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Method and device for measuring refractive index of gas |
| CN104931224A (en) * | 2015-06-16 | 2015-09-23 | 哈尔滨工业大学 | Device and method used for observing air flow field structure in environment of different degrees of vacuum |
Non-Patent Citations (1)
| Title |
|---|
| 李华等: "纹影***中物平面的选择与刀口的设置", 《实验流体力学》 * |
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Application publication date: 20180821 |