Experimental device for measuring laser wavelength by using double-slit interference

Abstract

The utility model discloses an experimental device for measuring laser wavelength by using double-slit interference, which belongs to the technical field of teaching aids and comprises a base, a first horizontal sliding track is arranged on the base, and a gradienter is arranged on one side of the base; the first support is arranged on the base, and the fixing clamp is arranged at the top end of the lifting rod set. The laser pen is fixed through the fixing hoop, and the ray of the laser pen is parallel to the first sliding track; the second support is in sliding connection with the first sliding rail, and a horizontal second sliding rail is arranged on the second support; the fixed support is in sliding connection with the second sliding track, and the double slits are arranged on a ray path of the laser pen; the laser range finder is arranged in the mounting groove, and the ray direction of the laser range finder is the same as that of the laser pen; the screen is arranged on a ray path of the laser pen, and the screen and the laser pen are respectively arranged on two opposite sides of the double slit. The laser pen is adopted as a light source, rays are stable, double-slit movement is simple, and debugging is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to teaching aid technical field, concretely relates to an experimental device of measuring laser wavelength by double slit interference. BACKGROUND

[0002] Double slit interference experiment is the important experiment in the optional compulsory one of high school physics teaching material. The existing experimental device is composed of bulb, single slit, double slit, light shielding cylinder, frosted glass and magnifying glass. Because of the structural reason, it is difficult to debug the interference fringe phenomenon, and because the light source of bulb is weak, the measurement accuracy is not high, which hinders the understanding of the students to the interference of light, and the experimental device has the defects of complex structure and great debugging difficulty during use, especially after adjusting the distance of double slit, the light source also needs to be further adjusted to ensure that the light can pass through the double slit, which brings many inconvenience to the teaching process and hinders the understanding of the students to the interference of light. Therefore, how to provide a kind of measurement device of wavelength convenient debugging is the problem that the person skilled in the art needs to solve urgently. CONTENT OF UTILITY MODEL

[0003] Therefore, the utility model provides an experimental device of measuring laser wavelength by double slit interference, and the utility model adopts laser pen as light source ray stability, and double slit is simple and convenient to debug.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] An experimental device of measuring laser wavelength by double slit interference, comprising:

[0006] A base is provided with a horizontal first sliding rail, and one side of the base is provided with a level;

[0007] A first support is arranged on the base, and the first support comprises a lifting rod group and a fixed clamp, and the fixed clamp is arranged at the top end of the lifting rod group;

[0008] A laser pen is fixed through the fixed clamp, and the ray of the laser pen is parallel to the first sliding rail;

[0009] A second support is slidably connected with the first sliding rail, and the second support is provided with a horizontal second sliding rail, and the second sliding rail is perpendicular to the first sliding rail;

[0010] A fixed support is slidably connected with the second sliding rail, and the fixed support is provided with a double slit and a mounting groove, and the double slit is arranged on the ray path of the laser pen;

[0011] A laser range finder is arranged in the mounting groove, and the direction of the laser range finder is the same as the direction of the laser pointer;

[0012] A screen is arranged on the path of the laser pointer, and the screen and the laser pointer are arranged on opposite sides of the double slit.

[0013] Preferably, the experimental device further comprises a support plate and a first telescopic rod, one end of the first telescopic rod is connected with the base, the other end of the first telescopic rod is connected with the support plate, and the first telescopic rod is provided with a fastening bolt.

[0014] Preferably, the lower end of the lifting rod group is provided with a connecting block, the connecting block is provided with a screwing piece, one end of the screwing piece arranged in the connecting block is provided with a first bevel gear, the connecting block is provided with a rotating rod, both ends of the rotating rod are provided with a second bevel gear, the lifting rod group is provided with a screw rod for driving the telescopic movement of the moving end, the screw rod is provided with a third bevel gear, the second bevel gear at one end of the rotating rod is connected with the first bevel gear, and the second bevel gear at the other end of the rotating rod is connected with the third bevel gear.

[0015] Preferably, the lifting rod group is provided with two first lifting rods and second lifting rods, the first lifting rod and the second lifting rod are in communication with the connecting block, and the threads of the screw rods of the first lifting rod and the second lifting rod are opposite in direction.

[0016] Preferably, the experimental device further comprises a limiting block, the limiting block is arranged at the front end of the mounting groove so that the starting point of the laser range finder is parallel to the starting point of the double slit.

[0017] Preferably, the experimental device further comprises an elastic pad and a fixing bolt, the elastic pad is connected with the top end of the mounting groove through a return spring, the mounting groove is provided with a threaded hole, the fixing bolt passes through the threaded hole and is in contact with the upper end of the elastic pad.

[0018] Preferably, the fixing support and the second support are fixed by screws.

[0019] The experimental device has the advantages that:

[0020] The utility model discloses a base makes laser pen, double slit and laser range finder keep stable, through level ensures that the base is stable, thereby prevents the path of laser pen skew, and the ray of laser pen can pass through double slit along with the sliding of fixed support along second sliding track, and the obvious interference pattern appears on the screen, and the experiment phenomenon and the measurement adjacent bright line interval of display are convenient, according to the interference principle of light, the greater the distance from double slit to screen, the more obvious interference pattern, laser range finder and double slit are all arranged on fixed support, therefore, when second support runs along first sliding track, laser range finder and double slit move synchronously, and the distance from double slit to screen is measured through laser range finder, finally, the wavelength of laser can be calculated by using formula in combination with double slit width. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, below will be to the embodiment or prior art description needed to use the drawing briefly introduced, obviously, the drawing in the following description only is the embodiment of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to the provided drawing.

[0022] Figure 1 It is the overall schematic view of the experimental device of the utility model;

[0023] Figure 2 It is the front view of the experimental device of the utility model;

[0024] Figure 3 It is the installation schematic view of second support and fixed support of the utility model.

[0025] Figure 4 It is the schematic view of first support of the utility model.

[0026] In the drawing, among them:

[0027] 1, base;2, first sliding track;3, first support;31, lifting rod group;311, first lifting rod;312, second lifting rod;32, fixed clamp;33, connecting block;34, screw part;35, first bevel gear;36, second bevel gear;37, rotating rod;38, third bevel gear;39, screw rod;4, laser pen;5, second support;6, second sliding track;7, fixed support;71, double slit;72, installation slot;73, laser range finder;74, limit block;75, elastic pad;76, fixed bolt;77, reset spring;8, screen;9, level;10, support plate;11, first telescopic rod;12, fastening bolt. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] Referring to the drawings Figures 1-4 The utility model discloses an experimental device for measuring laser wavelength by double-slit interference, which comprises:

[0030] The base 1 is provided with a horizontal first sliding rail 2, and a level 9 is arranged on one side of the base 1. The base 1 keeps the laser pen 4, the double-slit 71 and the laser range finder 73 stable, so as to reduce the deviation possibility in the moving adjustment process. The level 9 is arranged on the base 1, so that the experimental device is ensured to be horizontal during the placing process according to the level 9, thereby preventing the experimental error caused by the laser inclination.

[0031] The first support 3 is arranged on the base 1. The first support 3 comprises a lifting rod group 31 and a fixed clamp 32, and the fixed clamp 32 is arranged at the top end of the lifting rod group 31.

[0032] The laser pen 4 is fixed by the fixed clamp 32, and the ray of the laser pen 4 is parallel to the first sliding rail 2. The laser pen 4 is fixed by the first support 3, so as to ensure the stability of the laser ray. The fixed clamp 32 can adapt to and fix various models of the laser pen 4, thereby improving the application range of the laser pen 4.

[0033] The second support 5 is slidably connected with the first sliding rail 2, and a horizontal second sliding rail 6 is arranged on the second support 5. The second sliding rail 6 is perpendicular to the first sliding rail 2. The second support 5 slides along the first sliding rail 2, so as to drive the double-slit 71 to move, thereby realizing the distance adjustment between the double-slit 71 and the screen 8. According to the interference principle of light, the greater the distance between the double-slit 71 and the screen 8, the more obvious the interference pattern is, so as to ensure that the obvious interference pattern appears on the screen 8, thereby facilitating the display of the experimental phenomenon and the measurement of the distance between adjacent bright lines.

[0034] The fixed support 7 is slidably connected with the second sliding rail 6, and the double-slit 71 and a mounting groove 72 are arranged on the fixed support 7. The double-slit 71 is arranged on the ray path of the laser pen 4. The fixed support 7 slides along the second sliding rail 6, so as to ensure that the double-slit 71 is located on the ray path of the laser pen 4, thereby facilitating the subsequent test. Preferably, the double-slit 71 is fixed on the fixed support 7.

[0035] A laser range finder 73 is arranged in the mounting groove 72, and the ray direction of the laser range finder 73 is the same as that of the laser pen 4; the laser range finder 73 and the double slit 71 are both arranged on the fixed support 7, so that when the second support 5 runs along the first sliding rail 2, the laser range finder 73 and the double slit 71 move synchronously, and the distance from the double slit 71 to the screen 8 is measured by the laser range finder 73; finally, the wavelength of the laser can be calculated by using the formula combined with the width of the double slit 71.

[0036] The screen 8 is arranged on the ray path of the laser pen 4, and the screen 8 and the laser pen 4 are arranged on opposite sides of the double slit 71.

[0037] During the operation of the device, it is only necessary to adjust the laser pen 4 and the double slit 71 to be on the same straight line, so that the interference pattern can be observed on the screen 8; increasing the distance from the double slit 71 to the screen 8 can achieve the effect of increasing the distance between adjacent bright lines, which has the effect of magnification; the relative error of the experiment can be reduced through the effect of magnification, and the measurement accuracy can be improved. The device can adjust the distance from the double slit 71 to the screen 8 according to the requirements, so that the experimental phenomenon is very obvious, which is convenient for classroom display and measurement of the distance between adjacent bright lines.

[0038] In this embodiment, specifically, the experimental device further comprises a support plate 10 and a first telescopic rod 11, the support plate 10 is arranged below the base 1, one end of the first telescopic rod 11 is connected with the base 1, the other end of the first telescopic rod 11 is connected with the support plate 10, and the first telescopic rod 11 is provided with a fastening bolt 12; the first telescopic rod 11 is fixed by arranging the support plate 10, preferably four first telescopic rods 11 are evenly distributed at the lower end of the base 1 for supporting the base 1, the fastening bolts 12 of the four first telescopic rods 11 are loosened, the base 1 is manually lifted to realize the lifting of the base 1, and the fastening bolts 12 are tightened to realize the fixation of the base 1.

[0039] In this embodiment, specifically, the lower end of the lifting rod group 31 is provided with a connecting block 33, the connecting block 33 is provided with a screwing piece 34, one end of the screwing piece 34 arranged in the connecting block 33 is provided with a first bevel gear 35, the connecting block 33 is provided with a rotating rod 37, both ends of the rotating rod 37 are provided with a second bevel gear 36, the lifting rod group 31 is provided with a screw rod 39 for driving the telescopic movement of the moving end, the screw rod 39 is provided with a third bevel gear 38, the second bevel gear 36 at one end of the rotating rod 37 is connected with the first bevel gear 35, and the second bevel gear 36 at the other end of the rotating rod 37 is connected with the third bevel gear 38; the first bevel gear 35, the second bevel gear 36 and the third bevel gear 38 are matched to control the lifting of the lifting rod group 31 through the screwing piece 34, so as to realize the adjustment of the height of the laser pen 4.

[0040] In the embodiment, specifically, the lifting rod set 31 is provided with two lifting rods including a first lifting rod 311 and a second lifting rod 312, the first lifting rod 311 and the second lifting rod 312 are both communicated with the connecting block 33, and the screw rod 39 of the first lifting rod 311 and the second lifting rod 312 has opposite screw directions; by setting the first lifting rod 311 and the second lifting rod 312 and making the screw directions of the screw rods 39 opposite, synchronous movement of the first lifting rod 311 and the second lifting rod 312 is realized, and it is ensured that the laser beam of the laser pen 4 remains horizontal.

[0041] In the embodiment, specifically, the experimental device further includes a limiting block 74, the limiting block 74 is arranged at the front end of the mounting groove 72 to make the starting point of the laser range finder 73 parallel to the starting point of the double slit 71, when the laser range finder 73 is installed, the front end is attached to the limiting block 74, and the alignment of the laser range finder 73 and the double slit 71 is completed, and the installation efficiency and installation accuracy of the laser range finder 73 are improved.

[0042] In the embodiment, specifically, the experimental device further includes an elastic pad 75 and a fixing bolt 76, the elastic pad 75 is connected to the top end of the mounting groove 72 through a reset spring 77, a threaded hole is arranged on the mounting groove 72, and the fixing bolt 76 passes through the threaded hole and is in contact with the upper end of the elastic pad 75. When the laser range finder 73 is installed, the fixing bolt 76 is screwed to press and lower the elastic pad 75, the elastic pad 75 is in contact and pressed against the upper end of the shell of the laser range finder 73, damage to the shell of the laser range finder 73 is reduced, when disassembled, the fixing bolt 76 is screwed to separate from the elastic pad 75, and the reset spring 77 drives the elastic pad 75 to reset, so that the laser range finder 73 is conveniently disassembled.

[0043] In the embodiment, specifically, the fixed support 7 and the second support 5 are fixed by screws. The fixed support 7 slides along the second sliding rail 6 until the double slit 71 is located on the laser beam path of the laser pen 4, the fixed support 7 is locked by screws and spacers, and movement of the second support 5 is prevented from causing deviation of the fixed support 7 to affect the experiment.

[0044] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An experimental apparatus for measuring a wavelength of a laser light using double-slit interference, characterized by comprising: The utility model provides a laser screen display device, including: The base is provided with horizontal first sliding track, and one side of the base is provided with level meter; The first support is arranged on the base, and the first support includes lifting rod group and fixed clamp, and the fixed clamp is arranged on the top end of the lifting rod group; The laser pen is fixed through the fixed clamp, and the ray of the laser pen is parallel with the first sliding track; The second support is slidably connected with the first sliding track, and the second support is provided with horizontal second sliding track, and the second sliding track is perpendicular to the first sliding track; The fixed support is slidably connected with the second sliding track, and the fixed support is provided with double slit and mounting groove, and the double slit is arranged on the ray path of the laser pen; The laser range finder is arranged in the mounting groove, and the ray direction of the laser range finder is same with the ray direction of the laser pen; The screen is arranged on the ray path of the laser pen, and the screen and the laser pen are arranged on opposite sides of the double slit.

2. The experimental apparatus for measuring the wavelength of a laser light using double-slit interference according to claim 1, wherein: Further including support plate and first telescopic rod, the support plate is arranged below the base, one end of the first telescopic rod is connected with the base, the other end of the first telescopic rod is connected with the support plate, and the first telescopic rod is provided with fastening bolt.

3. The experimental apparatus for measuring the wavelength of a laser light using double-slit interference according to claim 1, wherein: The lower end of the lifting rod group is provided with connecting block, the connecting block is provided with screwing piece, one end of the screwing piece arranged in the connecting block is provided with first bevel gear, the connecting block is provided with rotating rod, both ends of the rotating rod are provided with second bevel gear, the lifting rod group is provided with screw rod for driving telescopic movement end, the screw rod is provided with third bevel gear, the second bevel gear of one end of the rotating rod is connected with the first bevel gear, and the second bevel gear of the other end of the rotating rod is connected with the third bevel gear.

4. The experimental apparatus for measuring the wavelength of a laser light using double-slit interference according to claim 3, wherein: The lifting rod group is provided with two first lifting rod and second lifting rod, the first lifting rod and the second lifting rod are communicated with the connecting block, and the thread direction of the screw rod of the first lifting rod and the second lifting rod is opposite.

5. The experimental apparatus for measuring the wavelength of a laser light using double-slit interference according to claim 1, wherein: Further including limiting block, the limiting block is arranged at the front end of the mounting groove to make the starting point of the laser range finder parallel with the starting point of the double slit.

6. The experimental apparatus for measuring the wavelength of a laser light using double-slit interference according to claim 1, wherein: Further including elastic pad and fixed bolt, the elastic pad is connected with the top end of the mounting groove through reset spring, the mounting groove is provided with threaded hole, the fixed bolt passes through the threaded hole and contacts with the upper end of the elastic pad.

7. The experimental apparatus for measuring the wavelength of a laser light using double-slit interference according to claim 1, wherein: The fixed support and the second support are fixed through screw.

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