CN202522204U - Measuring device for equal thickness interference experiment - Google Patents
Measuring device for equal thickness interference experiment Download PDFInfo
- Publication number
- CN202522204U CN202522204U CN2012200165513U CN201220016551U CN202522204U CN 202522204 U CN202522204 U CN 202522204U CN 2012200165513 U CN2012200165513 U CN 2012200165513U CN 201220016551 U CN201220016551 U CN 201220016551U CN 202522204 U CN202522204 U CN 202522204U
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- lens barrel
- equal thickness
- stepper motor
- camera
- thickness interference
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Abstract
The utility model relates to a measuring device for an equal thickness interference experiment, which comprises an equal thickness interference device (such as a Newton ring device), a reading microscope, a stepper motor, a rotary encoder, a sodium lamp, a lens barrel, and an object lens. The reading microscope, the stepper motor and the rotary encoder are fixed on a base via bolts, the sodium lamp is fixed on the base via a lamp barrel, and one end of the lens barrel is provided with the object lens and the other end is provided with a camera. The measuring device further comprises a transmission device by which the displacement of the lens barrel is controlled. The stepper motor and a synchronous belt are used by the transmission device to drive the lens barrel of the reading microscope to move. According to the device, through driving of the motor, image acquisition and movement of the lens barrel of the reading microscope controlled by corresponding software, equal thickness interference patterns of the full field of view can be obtained, and thus interference fringe intervals can be measured objectively and accurately to calculate a physical quantity to be measured.
Description
Technical field
The utility model relates to the Experiments of Optics in the College Physics, relates in particular to a kind of measurement mechanism that is used for equal thickness interference experiment.
Background technology
Equal thickness interference experiment is one of basic experiment in the Experiment of College Physics, also is important Experiments of Optics in the Experiment of College Physics.General using equal thickness interference pattern, for example measuring, filament diameter, radius of even convex lens etc. are difficult for the direct amount that records with dimensional measuring instrument.The observation of equal thickness interference experiment at present mainly contains three kinds of modes, and the one, through the eye-observation reading microscope, manual adjustments reads the spacing of dark lines of some levels or bright line, utilizes difference, optical wavelength and some other auxiliary physical quantity to calculate physical quantity to be measured indirectly.This mode adopts artificial judgement, when observation, produce visual fatigue at first easily and cause striped numeration mistake, secondly human eye to striped the most secretly or the judgement of where there is light have subjectivity, thereby the precision of influence experiment; The 2nd, through on optical bench, building light path; In the visual field, catch local equal thickness interference pattern through CCD or camera; Draw fringe spacing through demarcation and software analysis; But this mode is because the restriction of light path and on-screen display (osd) area can only obtain ten grades with interior clear interference fringe in the visual field; The 3rd, camera is loaded on the reading microscope eyepiece; Observe the interference pattern that amplifies through monitor; Judge the darkest or where there is light striped on the monitor through human eye or single-chip microcomputer, and counting, though this mode has been alleviated the visual fatigue when human eye is watched eyepiece for a long time; But still need the manual adjustments reading microscope that lens barrel is moved when measuring, the lens barrel coordinate scale also still needs manual work to read and calculate.
The utility model content
The utility model provides a kind of measurement mechanism of equal thickness interference experiment just to the problem that exists in the prior art, this device is realized electromechanical integration, can calculate measured physical quantity more convenient, accurately.
In order to address the above problem, the technical scheme that the utility model provides is following: a kind of measurement mechanism that is used for equal thickness interference experiment comprises equal thickness interference device (like newton ' s ring device); It is characterized in that: said measurement mechanism also comprises reading microscope, stepper motor, rotary encoder, sodium vapor lamp; Lens barrel, object lens, said reading microscope, stepper motor and rotary encoder are through being bolted on the base; Sodium vapor lamp is fixed on the base through support; The sodium vapor lamp height can movablely be regulated, and an end of lens barrel is provided with object lens, and the eyepiece end is provided with camera; Said measurement mechanism also comprises the gearing of control lens barrel displacement, and said gearing utilizes stepper motor, the reading microscope of band driving synchronously lens barrel to move.This technical scheme has realized the electromechanical integration transformation to traditional equal thickness interference experiment measurement mechanism, makes equal thickness interference experiment more objective, more accurate.
As a kind of improvement of the utility model, said gearing comprises synchronous pulley, control hand wheel and is with synchronously that band is wrapped in respectively on synchronous pulley and the control hand wheel synchronously.Control hand wheel links to each other with stepper motor on being installed in system's base through synchronous band, in the stepper motor rotating shaft synchronous pulley is installed, and when stepper motor rotates, can drive control hand wheel and rotate, thereby move microscope lens barrel.Rotary encoder is used for stepper motor is carried out closed-loop control, revises the deviation that produces in the rotation process.
As a kind of improvement of the utility model, said camera is the camera that contains CS camera lens bayonet socket.The camera lens of camera is taken off, change, insert in the microscopical eyepiece stalk, contain the installation that the camera of CS bayonet socket can better fit lens barrel inner structure with standard switching sleeve.
As a kind of improvement of the utility model, said stepper motor, rotary encoder, camera all can pass through data-interface and computing machine communication, realize the control of motor and the collection and the processing of image.
With respect to prior art; The beneficial effect of the utility model is that this device can pass through moving of motor-driven, IMAQ and corresponding software control reading microscope, can obtain the equal thickness interference pattern of full visual field; Thereby accurately measure the interference fringe spacing, calculate measured physical quantity.Can judge to interference pattern automatically that software can calculate required physical quantity automatically, like filament diameter or radius of even convex lens.Through demarcating, lens barrel moves control accuracy can reach 1/10th microns, and simultaneously, through moving of reading microscope lens barrel, thereby equivalence has obtained full visual field, to distinguish the interference fringe of full width face, improves the precision of experimental data.
Description of drawings
Accompanying drawing 1 is the utility model structural representation.
Accompanying drawing 2 is software flow patterns that the utility model is applied to EXPERIMENT OF NEWTON ' S.
Accompanying drawing 3 is that the utility model is applied to the software flow pattern that the splitter interferometric method is surveyed the filament diameter experiment.
Among Fig. 1: 1. base, 2. reading microscope, 3. control hand wheel, 4. object lens, 5. lens barrel, 6. camera, 7. band synchronously, 8. stepper motor and rotary encoder, 9. synchronous pulley, 10. sodium vapor lamp, 11. equal thickness interference devices.
Embodiment
Referring to Fig. 1, a kind of measurement mechanism that is used for equal thickness interference experiment comprises equal thickness interference device 11, and said measurement mechanism also comprises reading microscope 2; Stepper motor and rotary encoder 8, sodium vapor lamp 10, lens barrel 5, object lens 4; Said reading microscope 2, stepper motor and rotary encoder 8 are through being bolted on the base 1, and sodium vapor lamp 10 is fixed on the base 1 through the lamp tube; Sodium vapor lamp 10 highly can movablely be regulated, and an end of lens barrel 5 is provided with object lens 4, and the other end is provided with camera 6; Measurement mechanism also comprises the gearing of control lens barrel 5 displacements; Said gearing is between stepper motor and lens barrel; Said gearing comprises synchronous pulley 9, control hand wheel 3 and is with 7 synchronously, is with 7 to be wrapped in respectively on synchronous pulley 9 and the control hand wheel 3 synchronously.Control hand wheel 3 through synchronously with 7 be installed in system's base on stepper motor link to each other, in the stepper motor rotating shaft synchronous pulley is installed, when stepper motor rotates, can drive control hand wheel and rotate, thereby move microscope lens barrel.Camera 6 is the cameras that contain CS camera lens bayonet socket, and the camera lens of camera is taken off, and changes with standard switching sleeve, inserts in the microscopical eyepiece stalk, contains the installation that the camera of CS bayonet socket can better fit lens barrel inner structure.Object lens 4 are the object lens that contain half reflection; When light source irradiation is to object lens; The all thick interference device of half the directive downwards forms interference fringe when the object lens of half reflection, and this striped just can project on the CMOS light-sensitive surface of the camera 6 that contains CS camera lens bayonet socket through lens barrel 5.This device has been realized the electromechanical integration transformation to the conventional interference experimental provision, makes equal thickness interference experiment more objective, more accurate.
Embodiment 1: adopt the automatic measuring radius of even convex lens of said apparatus
This method may further comprise the steps successively, at first utilizes computer software to obtain the image in the camera 6; Signal closed-loop control stepper motor through computer external interface, stepper motor driving circuit and rotary encoder 8; Drive the transversal scanning of lens barrel 5; Spacing and stepper motor umber of pulse through judging micro-micrometer scale in the visual field are demarcated automatically, obtain the actual displacement amount of every pulse lens barrel.Subsequently according to central authorities' 0 grade of striped (blackening); The software-driven lens barrel is searched a left side half arc of the n level striped that sets; Because there is hysterisis error in microscope lens barrel in to-and-fro movement, so software can be positioned at the dark place of n+3 (3 are an empirical value) level interference fringe left side half arc automatically.Can avoid the influence of hysterisis error like this to measuring.Rotational pulse of every afterwards transmission just write down lens barrel 5 relative coordinate, gather a frame video image, image carried out gray scale, binary conversion treatment, the sequential scanning interference pattern is until the dark place of the right side of corresponding n level striped half arc successively.After reaching setting fringe order n, according to the lens barrel relative coordinate of record, the radius-of-curvature that the striped data calculate plano-convex lens.
Embodiment 2: adopt said apparatus to measure filament diameter automatically
This method may further comprise the steps successively, at first utilizes computer software to obtain the image of camera; Signal closed-loop control stepper motor through computer external interface, stepper motor driving circuit and rotary encoder; Drive the transversal scanning of lens barrel; Spacing and stepper motor umber of pulse through judging micro-micrometer scale in the visual field are demarcated automatically, obtain the actual displacement amount of every pulse lens barrel.Artificial assist location visual field central authorities are to the splitter edge, rotational pulse of every afterwards transmission just write down lens barrel relative coordinate, gather a frame video image, gray scale, binary conversion treatment done in image central authorities cross hair zone, recorded fringe and counting.After exceeding splitter device (a kind of equal thickness interference device) zone, go out filament diameter according to lens barrel relative coordinate, indirect calculation.
Claims (3)
1. a measurement mechanism that is used for equal thickness interference experiment comprises the equal thickness interference device, it is characterized in that: said measurement mechanism also comprises reading microscope; Stepper motor, rotary encoder, sodium vapor lamp, lens barrel, object lens; Said reading microscope, stepper motor and rotary encoder are through being bolted on the base; Sodium vapor lamp is fixed on the base through the lamp tube, and an end of lens barrel is provided with object lens, and the other end is provided with camera; Said measurement mechanism also comprises the gearing of control lens barrel displacement, and said gearing utilizes stepper motor, the reading microscope of band driving synchronously lens barrel to move.
2. the measurement mechanism that is used for equal thickness interference experiment according to claim 1 is characterized in that: said gearing comprises synchronous pulley, control hand wheel and is with synchronously that band is wrapped in respectively on synchronous pulley and the control hand wheel synchronously.
3. the measurement mechanism that is used for equal thickness interference experiment according to claim 1 and 2 is characterized in that: said camera is the camera that contains CS camera lens bayonet socket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200165513U CN202522204U (en) | 2012-01-16 | 2012-01-16 | Measuring device for equal thickness interference experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200165513U CN202522204U (en) | 2012-01-16 | 2012-01-16 | Measuring device for equal thickness interference experiment |
Publications (1)
| Publication Number | Publication Date |
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| CN202522204U true CN202522204U (en) | 2012-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200165513U Expired - Fee Related CN202522204U (en) | 2012-01-16 | 2012-01-16 | Measuring device for equal thickness interference experiment |
Country Status (1)
| Country | Link |
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| CN (1) | CN202522204U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528512A (en) * | 2013-10-31 | 2014-01-22 | 四川大学 | Novel cross hair direction finder of reading microscope |
| CN106228879A (en) * | 2016-08-31 | 2016-12-14 | 杭州大华仪器制造有限公司 | A network EXPERIMENT OF NEWTON ' S instrument based on laser parallel light pipe |
| CN106781937A (en) * | 2016-12-29 | 2017-05-31 | 阜阳师范学院 | Newton's ring experimental teaching accessory system and method |
| CN108806444A (en) * | 2018-09-05 | 2018-11-13 | 天津中德应用技术大学 | A kind of magnetic-type dual camera EXPERIMENT OF NEWTON ' S device Teaching instrument |
-
2012
- 2012-01-16 CN CN2012200165513U patent/CN202522204U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528512A (en) * | 2013-10-31 | 2014-01-22 | 四川大学 | Novel cross hair direction finder of reading microscope |
| CN106228879A (en) * | 2016-08-31 | 2016-12-14 | 杭州大华仪器制造有限公司 | A network EXPERIMENT OF NEWTON ' S instrument based on laser parallel light pipe |
| CN106781937A (en) * | 2016-12-29 | 2017-05-31 | 阜阳师范学院 | Newton's ring experimental teaching accessory system and method |
| CN108806444A (en) * | 2018-09-05 | 2018-11-13 | 天津中德应用技术大学 | A kind of magnetic-type dual camera EXPERIMENT OF NEWTON ' S device Teaching instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121107 Termination date: 20150116 |
|
| EXPY | Termination of patent right or utility model |