CN203134232U - Poisson spot experiment demonstration device - Google Patents
Poisson spot experiment demonstration device Download PDFInfo
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- CN203134232U CN203134232U CN 201320160544 CN201320160544U CN203134232U CN 203134232 U CN203134232 U CN 203134232U CN 201320160544 CN201320160544 CN 201320160544 CN 201320160544 U CN201320160544 U CN 201320160544U CN 203134232 U CN203134232 U CN 203134232U
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- level crossing
- light
- light source
- circular barrier
- opaque circular
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Abstract
The utility model discloses a poisson spot experiment demonstration device comprising a light source, an opaque circular barrier, and an optical screen. The opaque circular barrier is disposed on an optical path between the light source and the optical screen. At least a flat mirror is also provided, and can be used to project the light emitted by the light source on the optical screen after the reflection. The flat mirrors are disposed on the optical path between the light source and the opaque circular barrier and on the optical path between the opaque circular barrier and the optical screen. A plurality of flat mirrors are adopted and folded to reflect the light, therefore the miniaturization of the experiment place can be realized, the problems of the overlong demonstration optical path and overlarge occupied place can be prevented, in addition, the whole occupied experiment place is 0.6 square meter.
Description
Technical field
The utility model relates to a kind of instruments used for education, is specifically related to a kind of Poisson bright spot experimental demonstration instrument.
Background technology
The undulatory property of light is the important content in the College Physics course.Poisson bright spot is for when illumination is to the lighttight little plectane, the speck that occurs at the shade center of optical screen (outside shade the light and dark annulus of unequal-interval) in addition.It is the conclusion of being derived by Fresnel half-wave zone theory, is physical phenomenon and the perfect adaptation of mathematics idea in the optical research, extremely has cogency directly perceived in the undulatory property of proof light.Poisson bright spot experiment is the strong proof of light beats theory, at this experimental phenomena of classroom demonstration, the undulatory property of student's profound understanding light is played an important role undoubtedly.
This seems fantastic but has rational experimental phenomena and walks entering classrooms in order to make Poisson bright spot, a lot of experimental work persons disclose the design of oneself by article, patent form, but because this experimental phenomena Conditions is comparatively harsh, the big multi-pass of existing Poisson bright spot experimental provision is long, be generally 5-7m, it is big to take the experiment place; And experimental phenomena is unintelligible, watches difficultly, thereby demonstrates poor effect in the classroom.
From Fresnel half-wave zone theory, the speck of round screen diffraction mainly is the result of the light cut-through thing that do not covered by barrier.(referring to Fig. 2) if the barrier size obviously greater than laser facula, and even then experimental phenomena is very faint just can't see at all; If between light source and barrier, there is not corresponding regulating device, to want to watch tangible speck at the P point, the method for solution has following several: first: increase the distance between LASER Light Source and the barrier, do like this and can cause light path to prolong.Second: increase the hot spot of laser instrument itself, but laser instrument itself does not have adjusting leeway substantially, it is bigger perhaps to regulate difficulty.The 3rd: reduce the barrier size, but barrier is as too little, experimental phenomena is just very not obvious.CN2924694 disclosed " Poisson bright spot demonstrator " solves adjusting problem between light source and the barrier.How solving the long problem of loose speck experimental provision light path, is the problem that those skilled in the art need solve.
Summary of the invention
At the prior art above shortcomings, the utility model solve Poisson bright spot experimental provision light path long, be difficult in the problem of demonstrating on the classroom, and provide a kind of Poisson bright spot experimental demonstration instrument of miniaturization.
In order to solve the technical problem, the utility model adopts following technical scheme:
Poisson bright spot experimental demonstration instrument, comprise light source, opaque circular barrier and optical screen, opaque circular barrier is located in the light path between light source and the optical screen, also comprise at least one level crossing, described level crossing reflexes to optical screen with the light of light source emission, described level crossing is arranged in the light path between light source and the opaque circular barrier, and is arranged in the light path between opaque circular barrier and the optical screen; Satisfy diffraction conditions between the size of described opaque circular barrier and the light wavelength.Described laser is enough strong through the light intensity that can walk around opaque circular barrier after expanding.
Further, also comprise beam expanding lens, described beam expanding lens is located in the light path between light source and the opaque circular barrier, the light that light source sends after beam expanding lens diffusion direct irradiation on the opaque circular barrier or through being radiated at after the flat mirror reflects on the opaque circular barrier, reflected illumination is to optical screen again; Described beam expanding lens is concavees lens.
Further, also comprise convex lens, described convex lens are located in the light path between opaque circular barrier and the optical screen.
Compared to existing technology, the present invention has following beneficial effect:
1, the utility model adopts the multiaspect level crossing to turn back setting in order to reflected light, has realized the miniaturization of experiment place, has avoided the demonstration light path long, the problem that occupied ground is excessive, and whole experiment occupied ground is actually less than 1m
2
2, the light that adopts the beam expanding lens diffused light source to send has realized that the barrier size reaches a centimetre magnitude.
3, utilize convex lens that experimental phenomena is enlarged, experimental phenomena is more clear, and the class demonstration effect is better, is more convenient for observing.
Description of drawings
Fig. 1 is the structural representation of the utility model Poisson bright spot experimental demonstration instrument.
Fig. 2 is the principle schematic of the utility model Poisson bright spot experimental demonstration instrument.
Embodiment
The utility model is described in further detail below in conjunction with embodiment.
As shown in Figure 1: Poisson bright spot experimental demonstration instrument, comprise light source 1, steel ball 4 and optical screen 6, light source 1 adopts laser instrument, and steel ball 4 is located in the light path between light source 1 and the optical screen 6.The utility model also comprises 4 level crossings, is respectively first level crossing 31, second level crossing 32, the 3rd level crossing 33 and the 4th level crossing 34.The light that is sent by laser instrument 1 is radiated on the minute surface of first level crossing 31 after by beam expanding lens 2 diffusions, reflects at the minute surface of first level crossing 31, is radiated on the steel ball 4 the generation diffraction phenomena after the reflection.Light by steel ball 4 is radiated on the minute surface of second level crossing 32, the 3rd level crossing 33 and the 4th level crossing 34 successively and all reflects, and reflection is radiated on the optical screen 6 by convex lens 5; Optical screen 6 is made for frosted glass.The shadow central authorities that namely can be observed steel ball 4 on optical screen 6 are a bright spot, have spacing not wait light and dark diffraction annulus on every side, and diameter reaches 10cm.Satisfy diffraction conditions between the size of described steel ball 4 and the light wavelength.
Beam expanding lens is concavees lens, and steel ball 4 is suspended on the support by the absorption of needle needle point.The size of steel ball 4 and between the light wavelength of beam expanding lens diffusion, satisfy diffraction conditions.Described laser is enough strong through the light intensity that can walk around opaque circular barrier after expanding.For the amplification test phenomenon, be more convenient for observing, between level crossing and optical screen 6, also be provided with convex lens 5.
Need to prove that the utility model level crossing also can adopt settings of turning back of one side, two sides or multiaspect level crossing, in order to prolong reflected light path, realizes testing the place miniaturization, it is long to avoid demonstrating light path, the problem that occupied ground is excessive.Described level crossing is that 2,4 or 6 faces are comparatively suitable.
The utility model increases concavees lens between LASER Light Source and barrier, utilize concavees lens that laser facula is expanded, the distance of adjustable light sources and barrier then, simultaneously also can realize the barrier size is selected, principle as shown in Figure 2, after concavees lens expanded, laser facula cut-through thing collected in the P point, and speck appears in the P point; Also can regulate the distance of LASER Light Source and barrier and the size of barrier by position and the focal length of regulating concavees lens.
Need to prove at last, above embodiment is only in order to the technical solution of the utility model to be described but not the restriction technologies scheme, although the applicant has been described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, those are made amendment to the technical solution of the utility model or are equal to replacement, and do not break away from aim and the scope of the technical program, all should be encompassed in the middle of the claim scope of the present utility model.
Claims (6)
1. Poisson bright spot experimental demonstration instrument, comprise light source (1), opaque circular barrier (4) and optical screen (6), opaque circular barrier (4) is located in the light path between light source (1) and the optical screen (6), it is characterized in that, also comprise at least one level crossing, after reflecting through turning back, the light that described level crossing is launched light source (1) is projected to optical screen (6), described level crossing is arranged in the light path between light source (1) and the opaque circular barrier (4), and is arranged in the light path between opaque circular barrier (4) and the optical screen (6).
2. Poisson bright spot experimental demonstration instrument according to claim 1, it is characterized in that, also comprise beam expanding lens (2), described beam expanding lens (2) is located in the light path between light source (1) and the opaque circular barrier (4), direct irradiation is on opaque circular barrier (4) or through being radiated at after the flat mirror reflects on the opaque circular barrier (4) after beam expanding lens (2) diffusion for the light that light source (1) sends, and reflected illumination is to optical screen (6) again; Described beam expanding lens (2) is concavees lens.
3. Poisson bright spot experimental demonstration instrument according to claim 1 and 2 is characterized in that, also comprises convex lens (5), and described convex lens (5) are located in the light path between opaque circular barrier (4) and the optical screen.
4. Poisson bright spot experimental demonstration instrument according to claim 1 is characterized in that, described level crossing is 2 ~ 6.
5. Poisson bright spot experimental demonstration instrument according to claim 1 is characterized in that, described opaque circular barrier (4) is steel ball, and described steel ball is suspended on the support by needle absorption.
6. Poisson bright spot experimental demonstration instrument according to claim 4, it is characterized in that, described level crossing is 4, be respectively first level crossing (31), second level crossing (32), the 3rd level crossing (33) and the 4th level crossing (34), the light of described light source (1) emission is radiated on first level crossing (31) after beam expanding lens (2) diffusion, diffusion light is radiated on the opaque circular barrier (4) after first level crossing (31) reflection, the projection of opaque circular barrier (4) is successively through second level crossing (32), after the 3rd level crossing (33) and the 4th level crossing (34) reflection, planoconvex lens (5) is radiated on the optical screen (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320160544 CN203134232U (en) | 2013-04-02 | 2013-04-02 | Poisson spot experiment demonstration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320160544 CN203134232U (en) | 2013-04-02 | 2013-04-02 | Poisson spot experiment demonstration device |
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| Publication Number | Publication Date |
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| CN203134232U true CN203134232U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320160544 Expired - Fee Related CN203134232U (en) | 2013-04-02 | 2013-04-02 | Poisson spot experiment demonstration device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107773995A (en) * | 2017-12-08 | 2018-03-09 | 佛山市神风航空科技有限公司 | A kind of educational toy |
| CN107899234A (en) * | 2017-12-08 | 2018-04-13 | 佛山市神风航空科技有限公司 | A kind of light reflection into draw toy |
-
2013
- 2013-04-02 CN CN 201320160544 patent/CN203134232U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107773995A (en) * | 2017-12-08 | 2018-03-09 | 佛山市神风航空科技有限公司 | A kind of educational toy |
| CN107899234A (en) * | 2017-12-08 | 2018-04-13 | 佛山市神风航空科技有限公司 | A kind of light reflection into draw toy |
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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: 20130814 Termination date: 20140402 |