CN104933932A - Demonstration device for bending direction of light ray in positive gradient temperature field and experimental method - Google Patents
Demonstration device for bending direction of light ray in positive gradient temperature field and experimental method Download PDFInfo
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- CN104933932A CN104933932A CN201510360063.2A CN201510360063A CN104933932A CN 104933932 A CN104933932 A CN 104933932A CN 201510360063 A CN201510360063 A CN 201510360063A CN 104933932 A CN104933932 A CN 104933932A
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- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
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Abstract
The invention discloses a demonstration device for bending directions of light rays in a positive gradient temperature field. The demonstration device comprises a base, wherein a transparent water tank filled with water is arranged on the base, the right outer side surface of the transparent water tank is sprayed with a white paint layer, a semiconductor refrigerating chip bracket provided with a semiconductor refrigerating chip is arranged in the transparent water tank, the upper surface of the semiconductor refrigerating chip is a cold surface, the lower surface is a hot surface, the semiconductor refrigerating chip bracket and the semiconductor refrigerating chip are immersed in water, a laser device bracket provided with a semiconductor laser device and a cylindrical lens is arranged at the left side of the transparent water tank on the base, and the center line of the cylindrical lens is vertical to the horizontal plane and is vertical to laser beams emitted by the laser device in the same vertical plane. The demonstration device for the bending directions of the light rays in the positive gradient temperature field adopting the structure has the advantages of being simple in structure, fast in gradient temperature field establishing speed, stable in gradient temperature field, obvious and direct in demonstration effect, and capable of serving as the optical demonstration and experimental instrument.
Description
Technical field
The invention belongs to Experiments of Optics technical field of teaching instruments, be specifically related to the experimental apparatus demonstrating straight line bendingof light.
Background technology
The formation of linear propagation of light concept, starts from " axiom " concept of the linear propagation of light set up in the direct feel of people in limited range and primary and secondary geometry optics.And in fact linear propagation of light is with good conditionsi, in uniform dielectric, to be namely only only rectilinear propagation.The research of light transmission problem in an atmosphere shows, when light in an atmosphere long range propagation time, often there is bending of light transport phenomena.To the light mechanism that produces of the curve transmission imagination in an atmosphere, academia is early finalized, uneven namely due to temperature field in air, causes atmospheric density skewness, thus air index is distributed occur uneven state.Air index distribution uneven, must make light by time produce refraction, because the distribution of atmosphere temperature field is from macroscopic perspective, be gradual change and not mutated.Obviously, the distribution of air index is also gradual change.Therefore, light occurs that when passing propagation in atmosphere bending but not broken line transmits.The manifesting of buckling phenomenon when light transmits in an atmosphere, must meet two conditions, namely the variable gradient direction of air index and light transmission direction have a certain degree, and namely the change direction of the thermograde of air is not parallel with light transmission direction; Secondly, because the variable gradient of temperature in air is very little, light has to pass through long range propagation, and deviation is accumulated, and could obviously see bending of light direction.Because the thermal capacity of air is very little, be difficult to set up large air gradient temperature field in the space that laboratory is limited, therefore the bending transport phenomena of laboratory simulation demonstration light in temperature uneven atmospheric almost cannot, make student also just can only rely on imagination to the understanding of this optical phenomena.Water is as one other fluid, its character is very close with air with the characteristics of motion, the ratio of heat capacities air of water is much bigger simultaneously, easily in the water of limited bulk, set up high gradient temperature field, namely easily divided the Temperature Distribution value in bending transmission direction in water distribution and corresponding temperature field by observation light at non-uniform temperature, make student directly observe the bending transmission situation of light in known different directions gradient temperature field.But do not see relevant teaching and experimental demonstration instrument at present.
Summary of the invention
A technical matters to be solved by this invention be to provide a kind of reasonable in design, structure simple, demonstrating effect light bending direction apparatus for demonstrating in positive gradient temperature field intuitively.
Another technical matters to be solved by this invention is to provide a kind of experimental technique using light bending direction apparatus for demonstrating in positive gradient temperature field.
Solving the problems of the technologies described above adopted technical scheme is: on base, arrange the transparent sink built with water, the right outside side of transparent sink is coated with white skin of paint, the semiconductor refrigerating plate rack being provided with semiconductor chilling plate is set in transparent sink, the upper surface of semiconductor chilling plate is huyashi-chuuka (cold chinese-style noodles), semiconductor refrigerating plate rack and semiconductor chilling plate are immersed in the water, left side on base outside transparent sink arranges the laser stent being provided with semiconductor laser and cylindrical lens, the center line of cylindrical lens and horizontal plane, and it is mutually vertical in same perpendicular with the laser beam of laser emitting.
The geometric configuration of transparent sink of the present invention and semiconductor chilling plate is rectangular parallelepiped, and the upper surface of semiconductor chilling plate and plane-parallel, leading flank are parallel with the front side wall of transparent sink.
The diameter of cylindrical lens of the present invention is 3 ~ 5mm.
The experimental technique of above-mentioned light bending direction apparatus for demonstrating in positive gradient temperature field is used to be made up of following step.
1, the power supply of semiconductor laser is connected, the emergent light direction of synchronous adjustment semiconductor laser and the position of cylindrical lens, make the water in the laser beam transparent cylindrical lens formation fanning strip light transmission transparent sink of semiconductor laser outgoing, on white skin of paint, projection forms horizontal bands.
2, the light beam track of fanning strip light water is observed from tank front side wall level, relative position between adjustment fanning strip light and semiconductor chilling plate, make the light beam track of fanning strip light in water horizontally through directly over semiconductor chilling plate, fanning strip light place plane is parallel with semiconductor chilling plate upper surface, and the distance h between fanning strip optical thickness central plane and semiconductor chilling plate upper surface is 2 ~ 2.5mm.
3, the power supply of semiconductor chilling plate is connected, the upper surface of semiconductor chilling plate is huyashi-chuuka (cold chinese-style noodles), observe the situation of change of horizontal bands on white skin of paint, analyze in the middle part of horizontal bands that fanning strip light projects on white skin of paint recessed with semiconductor chilling plate above the relation of gradient temperature field direction.
The semiconductor chilling plate level of energising is immersed in the water by the present invention, positive gradient temperature field is set up in water above semiconductor chilling plate, make laser fanning strip light horizontally through the positive gradient temperature field above semiconductor chilling plate simultaneously, the laser fanning strip light be in positive gradient temperature field is bent downwardly, recessed in the middle part of the horizontal bands that white skin of paint is formed, demonstrate the bending direction of light in positive temperature gradient field intuitively.Bending of light direction apparatus for demonstrating in the positive gradient temperature field of this structure, structure speed that is simple, that set up gradient temperature field is fast, gradient temperature field is stable, demonstrating effect is obvious, intuitively, can be used as optical demo and experimental apparatus.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is that the semiconductor chilling plate 5 front laser fanning strip light that is energized is incident upon horizontal bands photo on white skin of paint 4.
Fig. 3 is photo recessed in the middle part of horizontal bands that after semiconductor chilling plate 5 is energized, laser fanning strip light is incident upon on white skin of paint 4.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in more detail, but the invention is not restricted to these embodiments.
Embodiment 1
In FIG, the light of the present embodiment bending direction apparatus for demonstrating in positive gradient temperature field is made up of semiconductor laser 1, cylindrical lens 2, transparent sink 3, white skin of paint 4, semiconductor chilling plate 5, semiconductor refrigerating plate rack 6, base 7, laser stent 8 connection.
Base 7 is placed with transparent sink 3, transparent sink 3 adopts organic glass to make, also quartz glass can be adopted to make, the geometric configuration of transparent sink 3 is rectangular parallelepiped, the in-built full water of transparent sink 3, the right outside side of transparent sink 3 is coated with white skin of paint 4, and white skin of paint 4 is for showing the shape of projection light belt.Bottom in transparent sink 3 is placed with semiconductor refrigerating plate rack 6, semiconductor refrigerating plate rack 6 sticks with glue connect and be connected with semiconductor chilling plate 5, semiconductor refrigerating plate rack 6 and semiconductor chilling plate 5 are immersed in the water, the geometric configuration of semiconductor chilling plate 5 is rectangular parallelepiped, the upper surface of semiconductor chilling plate 5 is huyashi-chuuka (cold chinese-style noodles), the upper surface of semiconductor chilling plate 5 and plane-parallel, the leading flank of semiconductor chilling plate 5 is parallel with the leading flank of transparent sink 3.
On base 7, the left side of transparent sink 3 is placed with laser stent 8, laser stent 8 is provided with semiconductor laser 1, semiconductor laser 1 can rotate on semiconductor laser 1 support, semiconductor laser 1 is for generation of laser, semiconductor laser 1 support is installed with cylindrical lens 2, the diameter of cylindrical lens 2 is 4mm, cylindrical lens 2 is on the laser emitting light direction of semiconductor laser 1, the center line of cylindrical lens 2 and horizontal plane, mutually vertical in same perpendicular with the laser beam of laser emitting.The fanning strip light of directive transparent sink 3 is formed after the laser beam transparent cylindrical lens 2 of semiconductor laser 1 outgoing, fanning strip light place plane is parallel with semiconductor chilling plate 5 upper surface, distance h between fanning strip optical thickness central plane and semiconductor chilling plate 5 upper surface is 2.2mm, fanning strip light from the top of semiconductor chilling plate 5 through tank, be incident upon on the white skin of paint 4 of transparent sink 3 right side wall, white skin of paint 4 forms horizontal bands.
Use above-mentioned light experimental technique step of bending direction apparatus for demonstrating in positive gradient temperature field as follows:
1, the power supply of semiconductor laser 1 is connected, the emergent light direction of synchronous adjustment semiconductor laser 1 and the position of cylindrical lens 2, make the laser beam transparent cylindrical lens 2 of semiconductor laser 1 outgoing form water in fanning strip light transmission transparent sink 3, on white skin of paint 4, projection forms horizontal bands.
2, the light beam track of fanning strip light water is observed from tank front side wall level, relative position between adjustment fanning strip light and semiconductor chilling plate 5, make the light beam track of fanning strip light in water horizontally through directly over semiconductor chilling plate 5, make the distance h between fanning strip optical thickness central plane and semiconductor chilling plate 5 upper surface be 2.2mm simultaneously, ensure that fanning strip light still projects on white skin of paint 4 and form the horizontal bands shown in Fig. 2 photo.
3, the power supply of semiconductor chilling plate 5 is connected, the upper surface of semiconductor chilling plate 5 is made to be huyashi-chuuka (cold chinese-style noodles), observe the situation of change of horizontal bands on white skin of paint 4, as shown in Fig. 3 photo, in figure 3, recessed in the middle part of the horizontal bands of projection on white skin of paint 4, illustrate that the light of upright temperature gradient field on semiconductor chilling plate 5 is bent downwardly.
Embodiment 2
Bottom in transparent sink 3 is placed with semiconductor refrigerating plate rack 6, semiconductor refrigerating plate rack 6 sticks with glue and is connected to semiconductor chilling plate 5, and semiconductor refrigerating plate rack 6 and semiconductor chilling plate 5 are immersed in the water, and the upper surface of semiconductor chilling plate 5 is huyashi-chuuka (cold chinese-style noodles).On base 7, the left side of transparent sink 3 is placed with laser stent 8, laser stent 8 is provided with semiconductor laser 1 and cylindrical lens 2, the diameter of cylindrical lens 2 is 4mm, cylindrical lens 2 is on the laser emitting light direction of semiconductor laser 1, the center line of cylindrical lens 2 and horizontal plane, mutually vertical in same perpendicular with the laser beam of laser emitting, the fanning strip light of directive transparent sink 3 is formed after the laser beam transparent cylindrical lens 2 of semiconductor laser 1 outgoing, fanning strip light place plane is parallel with semiconductor chilling plate 5 upper surface, distance h between fanning strip optical thickness central plane and semiconductor chilling plate 5 upper surface is 2mm, fanning strip light from the top of semiconductor chilling plate 5 through tank, be incident upon on the white skin of paint 4 of transparent sink 3 right side wall, white skin of paint 4 forms horizontal bands.The connecting relation of other parts and parts is identical with embodiment 1.
Use the present embodiment light light experimental technique step of bending direction apparatus for demonstrating in positive gradient temperature field as follows:
Step 1 is identical with embodiment 1.In step 2, the light beam track of fanning strip light water is observed from tank front side wall level, relative position between adjustment fanning strip light and semiconductor chilling plate 5, make the light beam track of fanning strip light in water horizontally through directly over semiconductor chilling plate 5, make the distance h between fanning strip optical thickness central plane and semiconductor chilling plate 5 upper surface be 2mm simultaneously, ensure that fanning strip light still projects on white skin of paint 4 and form horizontal bands.Step 3 is identical with embodiment 1.
Embodiment 3
Bottom in transparent sink 3 is placed with semiconductor refrigerating plate rack 6, semiconductor refrigerating plate rack 6 sticks with glue and is connected to semiconductor chilling plate 5, and semiconductor refrigerating plate rack 6 and semiconductor chilling plate 5 are immersed in the water, and the upper surface of semiconductor chilling plate 5 is huyashi-chuuka (cold chinese-style noodles).On base 7, the left side of transparent sink 3 is placed with laser stent 8, laser stent 8 is provided with semiconductor laser 1 and cylindrical lens 2, the diameter of cylindrical lens 2 is 4mm, cylindrical lens 2 is on the laser emitting light direction of semiconductor laser 1, the center line of cylindrical lens 2 and horizontal plane, mutually vertical in same perpendicular with the laser beam of laser emitting.The fanning strip light of directive transparent sink 3 is formed after the laser beam transparent cylindrical lens 2 of semiconductor laser 1 outgoing, fanning strip light place plane is parallel with semiconductor chilling plate 5 upper surface, distance h between fanning strip optical thickness central plane and semiconductor chilling plate 5 upper surface is 2.5mm, fanning strip light from the top of semiconductor chilling plate 5 through tank, be incident upon on the white skin of paint 4 of transparent sink 3 right side wall, white skin of paint 4 forms horizontal bands.The connecting relation of other parts and parts is identical with embodiment 1.
Use the experimental technique step of the present embodiment as follows:
Step 1 is identical with embodiment 1.In step 2, the light beam track of fanning strip light water is observed from tank front side wall level, relative position between adjustment fanning strip light and semiconductor chilling plate 5, make the light beam track of fanning strip light in water horizontally through directly over semiconductor chilling plate 5, make the distance h between fanning strip optical thickness central plane and semiconductor chilling plate 5 upper surface be 2.5mm simultaneously, ensure that fanning strip light still projects on white skin of paint 4 and form horizontal bands.Step 3 is identical with embodiment 1.
Embodiment 4
In above embodiment 1 ~ 3, on base 7, the left side of transparent sink 3 is placed with laser stent 8, laser stent 8 is provided with semiconductor laser 1 and cylindrical lens 2, and the diameter of cylindrical lens 2 is 3mm.The connecting relation of other parts and parts is identical with corresponding embodiment.
The experimental technique step of demonstration bending of light is identical with corresponding embodiment.
Embodiment 5
In above embodiment 1 ~ 3, on base 7, the left side of transparent sink 3 is placed with laser stent 8, laser stent 8 is provided with semiconductor laser 1 and cylindrical lens 2, and the diameter of cylindrical lens 2 is 5mm.The connecting relation of other parts and parts is identical with corresponding embodiment.
The experimental technique step of demonstration bending of light is identical with corresponding embodiment.
Principle of work of the present invention is as follows:
Be dipped in the semiconductor chilling plate 5 in water, energising after upper surface be huyashi-chuuka (cold chinese-style noodles), above semiconductor chilling plate 5 huyashi-chuuka (cold chinese-style noodles) distance upper surface 5mm altitude range in water in, formed positive gradient temperature field, namely with semiconductor chilling plate 5 upper surface for starting point, upwards temperature raises gradually.The density of water more than 4 DEG C and temperature are inversely proportional to, and the density of water is larger, and its refractive index is larger, and namely water temperature is low, then refractive index is large, graded region little large form refractive index above semiconductor chilling plate 5 under.Due to light in transmitting procedure always to the region deviation that refractive index is large, the laser beam therefore directly over semiconductor chilling plate 5 is bent downwardly, and makes the horizontal bands of center section on corresponding colour prime white skin of paint 4 recessed.
Claims (4)
1. light bending direction apparatus for demonstrating in positive gradient temperature field, it is characterized in that: in the upper transparent sink (3) arranged built with water of base (7), the right outside side of transparent sink (3) is coated with white skin of paint (4), the semiconductor refrigerating plate rack (6) being provided with semiconductor chilling plate (5) is set in transparent sink (3), the upper surface of semiconductor chilling plate (5) is huyashi-chuuka (cold chinese-style noodles), semiconductor refrigerating plate rack (6) and semiconductor chilling plate (5) are immersed in the water, in the upper transparent sink (3) of base (7) left side outward, the laser stent (8) being provided with semiconductor laser (1) and cylindrical lens (2) is set, the center line of cylindrical lens (2) and horizontal plane, and it is mutually vertical in same perpendicular with the laser beam of laser emitting.
2. light according to claim 1 bending direction apparatus for demonstrating in positive gradient temperature field, it is characterized in that: described transparent sink (3) and the geometric configuration of semiconductor chilling plate (5) are rectangular parallelepiped, the upper surface of semiconductor chilling plate (5) and plane-parallel, leading flank are parallel with the front side wall of transparent sink (3).
3. light according to claim 1 bending direction apparatus for demonstrating in positive gradient temperature field, is characterized in that: the diameter of described cylindrical lens (2) is 3 ~ 5mm.
4. use an experimental technique for the light bending direction apparatus for demonstrating in positive gradient temperature field described in claim 1, it is characterized in that being made up of following step:
1) power supply of semiconductor laser (1) is connected, the emergent light direction of synchronous adjustment semiconductor laser (1) and the position of cylindrical lens (2), make the water in the laser beam transparent cylindrical lens (2) formation fanning strip light transmission transparent sink (3) of semiconductor laser (1) outgoing, form horizontal bands in the upper projection of white skin of paint (4);
2) the light beam track of fanning strip light water is observed from tank front side wall level, relative position between adjustment fanning strip light and semiconductor chilling plate (5), make the light beam track of fanning strip light in water horizontally through directly over semiconductor chilling plate (5), fanning strip light place plane is parallel with semiconductor chilling plate (5) upper surface, and the distance h between fanning strip optical thickness central plane and semiconductor chilling plate (5) upper surface is 2 ~ 2.5mm;
3) power supply of semiconductor chilling plate (5) is connected, the upper surface of semiconductor chilling plate (5) is made to be huyashi-chuuka (cold chinese-style noodles), observe the situation of change of the upper horizontal bands of white skin of paint (4), analyze fanning strip light recessed relation with semiconductor chilling plate (5) top gradient temperature field direction in the middle part of the horizontal bands of the upper projection of white skin of paint (4).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290455A (en) * | 2016-07-30 | 2017-01-04 | 陕西师范大学 | The optical observation experimental provision of material conducts heat performance difference and experimental technique |
| CN107256669A (en) * | 2017-07-05 | 2017-10-17 | 陕西师范大学 | Mirage phenomenon transmits track experimental demonstration device with bending of light |
| CN113178119A (en) * | 2021-05-11 | 2021-07-27 | 南开大学 | Non-uniform refractive index field construction device and mirage demonstration device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290455A (en) * | 2016-07-30 | 2017-01-04 | 陕西师范大学 | The optical observation experimental provision of material conducts heat performance difference and experimental technique |
| CN106290455B (en) * | 2016-07-30 | 2019-03-05 | 陕西师范大学 | The optical observation experimental provision and experimental method of thermal conductivity of material difference |
| CN107256669A (en) * | 2017-07-05 | 2017-10-17 | 陕西师范大学 | Mirage phenomenon transmits track experimental demonstration device with bending of light |
| CN107256669B (en) * | 2017-07-05 | 2019-06-28 | 陕西师范大学 | Track experimental demonstration device is transmitted in mirage phenomenon and bending of light |
| CN113178119A (en) * | 2021-05-11 | 2021-07-27 | 南开大学 | Non-uniform refractive index field construction device and mirage demonstration device |
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| CN104933932B (en) | 2017-10-20 |
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