CN2924694Y - Poisson bright spot demonstrating instrument - Google Patents
Poisson bright spot demonstrating instrument Download PDFInfo
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- CN2924694Y CN2924694Y CN 200620120375 CN200620120375U CN2924694Y CN 2924694 Y CN2924694 Y CN 2924694Y CN 200620120375 CN200620120375 CN 200620120375 CN 200620120375 U CN200620120375 U CN 200620120375U CN 2924694 Y CN2924694 Y CN 2924694Y
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- lens
- bright spot
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- laser
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Abstract
A poisson spot demonstrating instrument is characterized in that the utility model comprises a laser. The laser is a rectangular-shaped body. A laser output hole is arranged on the laser and arranged at the left end of the upper top plane of the laser. A plane mirror is arranged adjacent to the laser output hole. The mirror surface of the plane mirror is right corresponding to the output hole of the laser. An optical filtering panel is arranged on the downstream and equal-height of the plane mirror. An optical filtering hole is arranged in the optical filtering panel. A shading screen is arranged in the downstream and equal-height of the optical filtering panel. A shading round screen is arranged on the shading screen. A lens is arranged on the downstream and equal-height of the shading screen. A Poisson spot observation system is arranged on the downstream and equal-height of the lens. The poisson spot demonstrating instrument has simple structure, easy operation, large area of the pattern, short distance between the light source and a displayer (0.7m-0.4m) and no darkroom, and is economical and practical, and has no difficulties of the maintenance. The dust can be used as the shading body, which facilities the observation of the various circumstances of the Poisson spot pattern caused by the dust of different sizes.
Description
Technical field
The utility model relates to a kind of physical optics demonstration instrument, specifically, relates to a kind of Poisson bright spot demonstrator that can conveniently demonstrate in short distance.
Background technology
It is very convincing that the Poisson bright spot phenomenon has undulatory property to light.In order to demonstrate Poisson bright spot, available arc light irradiation diameter 40cm occulter can obtain Poisson bright spot on the screen at distance light source 8km place, and its shortcoming is a distance, can't demonstrate; Helium-neon laser irradiation diameter 3mm occulter can obtain Poisson bright spot on the screen at distance light source 9m place, its shortcoming is that pattern is little, distance, and the darkroom requires high; Infrared Poisson bright spot can become existing at the 1.3m place, its shortcoming is that distance is big, and equipment is huge, cost height, maintenance difficult.Above-mentioned Poisson bright spot almost can't be demonstrated because of its shortcoming is respectively arranged, thereby does not have the Poisson bright spot demonstrator in big, the middle school apparatus preparation catalogue, and the student is difficult to get information about to it like this.
In view of this, in order to overcome above-mentioned shortcoming, this creator is according to oneself practical experience and technical concept, after deliberation, exploitation, and has the utility model to produce eventually.
The utility model content
The utility model technical issues that need to address just are to overcome because of distance, pattern is little, the darkroom requires high, equipment is huge, the cost height, problem such as maintenance difficult and almost can't demonstrate the defective of Poisson bright spot provides a kind of Poisson bright spot demonstrator, disperse amplification through focus on the focal plane again, show Poisson bright spot on the observing system, solved the difficulty that Poisson bright spot is difficult to demonstrate, it is simple in structure, easy to operate, the Poisson bright spot pattern area is big, light source to optical screen apart from weak point (0.7m-0.4m), do not need the darkroom, economical and practical, do not relate to a maintenance difficult problem.
For addressing the above problem, the utility model adopts following technical scheme:
A kind of Poisson bright spot demonstrator, it is characterized in that: include a laser instrument, described laser instrument is the rectangular parallelepiped body, laser instrument is provided with delivery outlet, the laser delivery outlet is arranged on end face left end on the laser instrument, be provided with a level crossing near the laser delivery outlet, the level crossing minute surface is over against the laser instrument delivery outlet, highlands such as level crossing downstream and level crossing are provided with the screen that filters, filter to shield and offer the optical filtering hole, highlands such as the optical filtering screen downstream and the screen that filters are provided with an eclipser, the eclipser center offers a rectangle light hole, installing one transparent panel on the light hole, and transparent panel is provided with the shading round screen, highlands such as eclipser downstream and shading round screen are provided with lens, and highlands such as lens downstream and lens are provided with a Poisson bright spot observing system;
Described laser instrument is the J2513 helium-neon laser;
Described level crossing, optical filtering screen, eclipser, lens and observing system are respectively arranged with height-adjustable movable bearing support;
The diameter in described optical filtering hole is 1.5-2mm;
Described shading round screen footpath≤0.52mm;
Described eclipser is 0-30cm to the distance of lens;
Described lens distance level crossing distance is 10-20cm, described observing system apart from lens distance greater than 30cm;
Described lens are convex lens or concavees lens;
Described focal length of convex lens is 0.7-1.5cm;
Described observing system is white light screen or observation eyepiece.
In order to obtain Poisson bright spot preferably, lens distance level crossing horizontal range described in the utility model is 10-20cm, described demonstration optical screen apart from lens distance greater than 30cm.
Lens described in the utility model can be convex lens or concavees lens.Described focal length of convex lens is about 0.7cm-1.5cm, and lens can rotate in the sleeve of silking is arranged.
Principle of the present utility model is: according to shading round screen diffraction formula: A=ak+1/2
How promptly pay no attention to shading round screen size and position, the central authorities of shading round screen shade have speck forever.
Know according to shading round screen diffractive technology background: the big more light source of shading round screen is far away more apart from the optical screen distance, and shading round screen small light source more is near more apart from demonstration optical screen distance.As can be known, want the close-ups Poisson bright spot, must dwindle shading round screen diameter.But when shading round screen diameter is very little, be invisible to the naked eye, formed Poisson hot spot pattern is also very little, and naked eyes be can't see equally.So can only amplify pattern and on display screen, show by technology.
The utility model addresses the above problem and can adopt teaching to penetrate on vertically with the J2513 laser beam, penetrate through the flat right side of a mirror surface, pass optical filtering hole (diameter is 1.5-2mm) to the transparent panel of the eclipser apart from about level crossing 15cm, design has the shading round screen of a lot≤0.52mm on the transparent panel, by all around, move up and down convex lens, the light beam incidence point is searched on the eclipser transparent panel is moved.Because design has the numerous shading round screen of different sizes (comprising dust) on the transparent panel, produce diffraction phenomena when light is met, thereby produce the Poisson bright spot after assembling in the lens back.When occulter size (relevant) symbol with optical wavelength and focal length of convex lens etc.---when caused Poisson bright spot pattern becomes on the focal plane, naked eyes can not be differentiated, can be considered a Poisson bright spot, disperse function by concave lens focus amplifies pattern, thereby can clear demonstration Poisson bright spot pattern on the observing system in the very big distance range beyond distance mirror 25cm.(observation eyepiece is observed the amplification pattern after the frosted glass transmission for available white light screen 10cm * 12cm Direct observation reflection graphic patterns, frosted glass optical screen 10cm * 12cm Direct observation transmission pattern.)
The utility model has utilized the disperse function of convex lens back focal planes, on screen, search one when stablize Poisson hot spot pattern, another lens of increase outside the one times of focal length in convex lens back can make the Poisson bright spot pattern amplify for the second time again.
Because concavees lens itself have disperse function to light, thus with in the alternative the utility model of the concavees lens of proper focal length convex lens can reach the expectation effect equally.
The utility model principle and similar are in the husband youth and the circular hole diffraction of Feiing.
The beneficial effects of the utility model are: simple in structure, easy to operate, pattern area is big, and light source is to showing that optical screen apart from weak point (0.7m-0.4m), does not need the darkroom, and is economical and practical, do not relate to a maintenance difficult problem, seeks rapidly, and the time spent is very short.
Description of drawings
Fig. 1 is the utility model example structure synoptic diagram.
Embodiment
As shown in Figure 1, be the utility model example structure synoptic diagram.This Poisson bright spot demonstrator, it comprises a laser instrument 1, described laser instrument 1 is a J2513 helium-neon laser, optical maser wavelength is 0.62 micron, laser instrument 1 profile is a rectangular parallelepiped: long 70cm, wide 16cm, high 12cm, laser instrument 1 is provided with laser delivery outlet 2, laser delivery outlet 2 is arranged on a face left end on the laser instrument 1, be provided with a level crossing 3 near the laser delivery outlet 2, level crossing 3 minute surfaces are over against laser instrument delivery outlet 2, make and after level crossing 3 reflections, penetrate on the level right side from the light beam of laser instrument delivery outlet 2 outputs, highlands such as level crossing 3 downstreams and level crossing are provided with the screen 4 that filters, optical filtering screen 4 centers offer an optical filtering hole 41, highlands such as 41 downstreams, optical filtering hole are provided with an eclipser 5, eclipser 5 is provided with shading round screen 51, shading round screen 51 is located on the transparent panel 52, transparent panel 52 is contained on the eclipser 5 that has the rectangle light hole, highlands such as eclipser 5 downstreams are provided with lens 6, the focal length of lens 6 is the convex lens of 0.7cm-1.5cm, and highlands such as convex lens downstream and convex lens are provided with a Poisson bright spot observing system 7.
For the ease of regulating height, level crossing 3, optical filtering hole 41, shading round screen 51, lens 6 and observing system 7 highly are consistent, and level crossing 3 described in the utility model, optical filtering hole 41, shading round screen 51, lens 6 and observing system 7 have been installed in respectively on the height-adjustable movable bearing support 8.
In order to obtain Poisson bright spot preferably, lens distance level crossing distance described in the utility model is 15cm, and described observing system is 60cm apart from the level crossing distance.By regulating convex lens position and direction, just can show the Poisson bright spot pattern that little round screen causes in observing system.
In order to show Poisson bright spot well, observing system described in the utility model is white light screen or observation eyepiece (focal length is 5cm).
Replace convex lens with concavees lens and also good result can occur.
Secondary amplifies the laser spots can make on the catoptron and reduces to below the 40cm to the distance of display screen.
The round screen diffraction pattern amplifies through secondary evening, throws on the white wall at distance level crossing 2m place, and pattern magnitude has 40cm, and the full classmate of class is seen simultaneously.
Round screen diffraction pattern daytime with little camera by terminal to TV screen, the full classmate of class is seen simultaneously.
Claims (10)
1, a kind of Poisson bright spot demonstrator, it is characterized in that: include a laser instrument, described laser instrument is the rectangular parallelepiped body, laser instrument is provided with the laser delivery outlet, the laser delivery outlet is arranged on end face left end on the laser instrument, be provided with a level crossing near the laser delivery outlet, the level crossing minute surface is over against the laser instrument delivery outlet, highlands such as level crossing downstream and level crossing are provided with the screen that filters, filter to shield and offer the optical filtering hole, highlands such as the optical filtering screen downstream and the screen that filters are provided with an eclipser, the eclipser center offers a rectangle light hole, installing one transparent panel on the light hole, and transparent panel is provided with the shading round screen, highlands such as eclipser downstream and shading round screen are provided with lens, and highlands such as lens downstream and lens are provided with a Poisson bright spot observing system.
2, Poisson bright spot demonstrator as claimed in claim 1 is characterized in that: described laser instrument is the J2513 helium-neon laser.
3, Poisson bright spot demonstrator as claimed in claim 2 is characterized in that: described level crossing, optical filtering screen, eclipser, lens and observing system are respectively arranged with height-adjustable movable bearing support.
4, Poisson bright spot demonstrator as claimed in claim 3 is characterized in that: the diameter in described optical filtering hole is 1.5mm-2mm.
5, Poisson bright spot demonstrator as claimed in claim 4 is characterized in that: described shading round screen diameter≤0.52mm.
6, Poisson bright spot demonstrator as claimed in claim 5 is characterized in that: described eclipser is 0-30cm to the distance of lens.
7, Poisson bright spot demonstrator as claimed in claim 6 is characterized in that: described lens distance level crossing distance is 10-20cm, described observing system apart from lens distance greater than 30cm.
8, Poisson bright spot demonstrator as claimed in claim 7 is characterized in that: described lens are convex lens or concavees lens.
9, Poisson bright spot demonstrator as claimed in claim 8 is characterized in that: described focal length of convex lens is 0.7-1.5cm.
10, Poisson bright spot demonstrator as claimed in claim 1 is characterized in that: described observing system is white light screen or observation eyepiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120375 CN2924694Y (en) | 2006-06-21 | 2006-06-21 | Poisson bright spot demonstrating instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120375 CN2924694Y (en) | 2006-06-21 | 2006-06-21 | Poisson bright spot demonstrating instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2924694Y true CN2924694Y (en) | 2007-07-18 |
Family
ID=38261123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620120375 Expired - Fee Related CN2924694Y (en) | 2006-06-21 | 2006-06-21 | Poisson bright spot demonstrating instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2924694Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105243943A (en) * | 2015-11-22 | 2016-01-13 | 湖南城市学院 | Physical experiment-used lens group |
-
2006
- 2006-06-21 CN CN 200620120375 patent/CN2924694Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105243943A (en) * | 2015-11-22 | 2016-01-13 | 湖南城市学院 | Physical experiment-used lens group |
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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: 20070718 |