CN105825750A - Tuning fork resonance and vibration image demonstration instrument - Google Patents
Tuning fork resonance and vibration image demonstration instrument Download PDFInfo
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- CN105825750A CN105825750A CN201610378696.0A CN201610378696A CN105825750A CN 105825750 A CN105825750 A CN 105825750A CN 201610378696 A CN201610378696 A CN 201610378696A CN 105825750 A CN105825750 A CN 105825750A
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- tuning fork
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- 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
- G09B23/14—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for acoustics
Abstract
The invention relates to a tuning fork resonance and vibration image demonstration instrument and belongs to physics teaching aids. The tuning fork resonance and vibration image demonstration instrument comprises a transparent box, a rotary foundation, a tuning fork, a small eyeglass, a built-in loudspeaker type sound box, a micro voice frequency generator, a smog device, a laser pen, a left reflective mirror, a right reflective mirror, an electric hexagonal prism reflective mirror and a semi-transparent plastic screen. The instrument can not only be used for observing resonance phenomena, but also can be used for demonstrating vibration images of the tuning fork; the instrument employs the sound box to drive the tuning fork to realize continuous resonance; a problem of non-easy observation because of small vibration amplitude can be solved through employing the light amplification principle; the visual persistence principle is employed, the experiment principle and the method are ingenious, experiment phenomena are obvious and visual, and scientificity, teaching significance, exploration values and interestingness of the instrument are realized.
Description
Technical field
The invention discloses a kind of double vibrational image demonstrator of tuning fork resonance, relate to a kind of combination laser demonstration tuning fork covibration and the experimental apparatus of vibrational image, belong to physical teaching aid.
Background technology
In physics teaching, teacher typically comes demonstrating resonance experiment, i.e. sympathetic response experiment with two tuning forks.Tuning fork is the steel in Y-shaped or aluminium alloy acoustical generator, and various tuning forks can be because its quality be with yoke length, thickness is different and sends the pure tone of different frequency when vibration.During experiment, take two identical tuning fork a and b of natural frequency and allow its resonance chamber place mouth to mouth, tapping tuning fork a and make its sounding, pin tuning fork a with hands a moment later and make it stop sounding, now can hear that the tuning fork b not being tapped also have issued sound.This standard protocol exists many not enough: (1) is inadequate due to the loudness of tuning fork a shoo, and experimental phenomena is the most obvious；(2) due to tuning fork vibration loss substantially, cause the tuning fork vibration time short, it is impossible to continue sympathetic response；(3) tuning fork vibration amplitude is little, is difficult to directly observe.
Summary of the invention
In order to solve above-mentioned deficiency, available light amplification and persistence of vision principle, design a kind of combination laser demonstration tuning fork covibration and the experimental apparatus of vibrational image.The present invention adopts the following technical scheme that a kind of double vibrational image demonstrator of tuning fork resonance, including glass box, Rotatable base, tuning fork, little eyeglass, built-in microphone formula audio amplifier, compact audio generator, aerosolizer, laser pen, nearside mirror, right illuminator, electronic six prism illuminators, translucent plastic screen etc., it is characterized in that: glass box specifically includes glass box body, stretch out one's hand operation elliptical aperture and black paper etc., described black paper is pasted onto glass box trailing flank inwall as black background, allow laser beam show become apparent from, described operation elliptical aperture of stretching out one's hand is located at lower half position, left side, conveniently the device in glass box is operated；Fixing in glass box and put the devices such as tuning fork, built-in microphone formula audio amplifier, compact audio generator, aerosolizer, left and right sides inwall is pasted with nearside mirror and right illuminator respectively；Rotatable base is contained in bottom glass box, can be used to rotating transparent case, convenient adjustment viewing angle；Tuning fork specifically includes resonance chamber, prong and frequency modulation part, and the position of regulation frequency modulation part can change the natural frequency of tuning fork；Little lens sticker, in tuning fork prong, can vibrate with tuning fork prong；Built-in microphone formula audio amplifier just resonance chamber to tuning fork, specifically includes audio amplifier body, built-in microphone, audio amplifier switch, volume adjustment knob and audio amplifier wiring etc.；Compact audio generator, specifically includes audio-frequency generator body, switch, coarse adjustment frequency knob, fine tuning frequency knob, digital display screen and output interface etc., can produce the signal of telecommunication that frequency is 0-1000Hz and be defeated by built-in microphone formula audio amplifier；Aerosolizer, built with cake, can produce a small amount of cigarette, it is possible to visualise the optical track of laser beam after lighting；Laser pen is fixed on glass box right flank inwall near bottom position, can freely adjust its angle, its laser beam sent can be mapped to little eyeglass and be reflected on right illuminator, then passes through nearside mirror, right illuminator and electronic six prism illuminator repeatedly roundtrip to translucent plastic screen；Electronic six prism illuminators are fixed on glass box right flank inwall near tip position, specifically include six prism illuminators, motor, motor power, on and off switch and speed governing knob etc., turn on the power switch and six prism illuminators can be made to rotate with motor；Translucent plastic screen is attached to glass box left surface inwall near tip position, specifically includes screen body, rectangular coordinate and scale etc..
The principle of the present invention is described as follows: during experiment, compact audio generator can produce the signal of telecommunication of certain frequency and be transported to built-in microphone formula audio amplifier, built-in microphone formula audio amplifier can send the sound of corresponding frequencies, resonance chamber and the prong of tuning fork thus under the effect of sound, make forced vibration.Meeting resonance condition when the frequency of sound is equal to the natural frequency of tuning fork, now tuning fork prong vibration is the most obvious.Owing to tuning fork prong is vibrated back and forth, the laser that laser pen sends can the most quickly swing after too small lens reflecting, it is mapped on translucent plastic screen after the multiple reflections of nearside mirror, right illuminator and electronic six prism illuminators again, thus has reached, in the limited space of glass box, the purpose that amplification is sufficiently large.Due to persistence of vision principle, its laser beam shows one " triangle clear zone " and the optical track in multiple " tetragon clear zone " in the cigarette that aerosolizer produces and manifests one section " bright wisp " on translucent plastic screen.When electronic six prism illuminators rotate, again due to persistence of vision principle, can quickly manifest again a sinusoidal vibrational diagram optical track on translucent plastic screen.
(1) frequency impact on tuning fork vibration of audio amplifier sound is probed into
As a example by selecting the natural frequency tuning fork as 440Hz, during experiment, fix each device as requested, light the cake in aerosolizer and send a small amount of cigarette and be diffused into whole glass box, open laser pen power supply, in glass box, now only see an incident ray and a plurality of reflection light.Then, the signal of telecommunication allowing compact audio generator send certain frequency makes built-in microphone formula audio amplifier send sound, keep constant after heightening volume by volume adjustment knob as far as possible, 500Hz is increased to from 400Hz by the frequency of the compact audio generator regulation signal of telecommunication, it can be seen that one " triangle clear zone " and multiple " tetragon clear zone " optical track in glass box, when incoming frequency is 440Hz, tuning fork vibration is the most obvious, and the area of " triangle clear zone " and " tetragon clear zone " optical track is the most maximum.During experiment, the natural frequency of tuning fork can be changed by frequency modulation part, repeat above-mentioned experimental procedure, it appeared that only when sound frequency is equal to the natural frequency of tuning fork, tuning fork resonates.
(2) volume impact on tuning fork vibration of audio amplifier sound is probed into
During experiment, the frequency that can keep input electrical signal is constant, the volume of built-in microphone formula audio amplifier shoo is changed by volume adjustment knob, it appeared that wave volume is the highest, tuning fork vibration is the most obvious, and the area of " triangle clear zone " and " tetragon clear zone " optical track seen in glass box is the biggest.
(3) the vibrational diagram experiment of demonstration tuning fork
When six prism illuminators do not rotate, translucent plastic screen leaves one section of " bright wisp " optical track.Regulate rotating speed when Guan Bi electric motor power switch and by speed governing knob, make six prism illuminators with motor with certain rotational speed, due to persistence of vision principle, translucent plastic screen can quickly manifest a sinusoidal vibrational diagram optical track.
Accompanying drawing explanation
Fig. 1 is the front view that the present invention is overall；
Fig. 2 is the simple solid figure of glass box in Fig. 1；
Fig. 3 is the enlarged drawing of tuning fork in Fig. 1；
Fig. 4 is the enlarged drawing of electronic six prism illuminators in Fig. 1；
Fig. 5 is audio amplifier and the enlarged drawing of compact audio generator in Fig. 1；
Fig. 6 is the schematic flow sheet of operation principle of the present invention；
Fig. 7 is audio amplifier design sketch when not sending sound in glass box；
Fig. 8 is electronic six prism illuminators design sketchs when not rotating on screen；
Design sketch on screen when Fig. 9 is electronic six prism illuminators rotation.
In figure: 1. glass box, be specifically related to 1a. glass box body, 1b. stretches out one's hand operation elliptical aperture and the black paper of 1c.；2. Rotatable base；3. tuning fork, is specifically related to 3a. resonance chamber, 3b. prong and 3c. frequency modulation part；The least eyeglass；5. built-in microphone formula audio amplifier, is specifically related to 5a. audio amplifier body, 5b. built-in microphone, 5c. switch, 5d. volume adjustment knob and 5e. audio amplifier wiring；6. compact audio generator, is specifically related to 6a. audio-frequency generator body, 6b. switch, 6c. coarse adjustment frequency knob, 6d. fine tuning frequency knob, 6e. digital display screen and 6f. output interface；7. aerosolizer, is specifically related to 7a. cigarette case, 7b. cake and 7c. cigarette；8. laser pen；9. nearside mirror；The rightest illuminator；11. electronic six prism illuminators, are specifically related to 11a. six prism illuminator, 11b. motor, 11c. motor power, 11d. on and off switch and 11e. speed governing knob；12. translucent plastic screens, are specifically related to 12a. screen body, 12b. rectangular coordinate and 12c. scale；13. laser optical tracks, are specifically related to 13a. incident ray, 13b. reflection light, 13c. " triangle clear zone ", 13d. " tetragon clear zone ", 13e. " bright wisp " and 13f. " sine curve ".
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
nullShown in Fig. 1-Fig. 5，A kind of double vibrational image demonstrator of tuning fork resonance，Including glass box (1)、Rotatable base (2)、Tuning fork (3)、Little eyeglass (4)、Built-in microphone formula audio amplifier (5)、Compact audio generator (6)、Aerosolizer (7)、Laser pen (8)、Nearside mirror (9)、Right illuminator (10)、Electronic six prism illuminators (11)、Translucent plastic screen (12) etc.，It is characterized in that: glass box (1) specifically includes glass box body (1a)、Stretch out one's hand operation elliptical aperture (1b) and black paper (1c) etc.，Described black paper (1c) is pasted onto glass box (1) trailing flank inwall as black background，Allow laser beam show become apparent from，Described operation elliptical aperture (1b) of stretching out one's hand is located at lower half position, left side，Conveniently the device in glass box (1) is operated；Fixing in glass box (1) and put the devices such as tuning fork (3), built-in microphone formula audio amplifier (5), compact audio generator (6), aerosolizer (7), left and right sides inwall is pasted with nearside mirror (9) and right illuminator (10) respectively；Rotatable base (2) is contained in glass box (1) bottom, can be used to rotating transparent case (1), convenient adjustment viewing angle；Tuning fork (3) specifically includes resonance chamber (3a), prong (3b) and frequency modulation part (3c), and the position of regulation frequency modulation part (3c) can change the natural frequency of tuning fork；Little eyeglass (4) is attached in tuning fork prong (3b), can vibrate with tuning fork prong (3b)；Built-in microphone formula audio amplifier (5) just resonance chamber (3a) to tuning fork, specifically includes audio amplifier body (5a), built-in microphone (5b), audio amplifier switch (5c), volume adjustment knob (5d) and audio amplifier wiring (5e) etc.；Compact audio generator (6), specifically include audio-frequency generator body (6a), switch (6b), coarse adjustment frequency knob (6c), fine tuning frequency knob (6d), digital display screen (6e) and output interface (6f) etc., the signal of telecommunication that frequency is 0-1000Hz can be produced and be defeated by built-in microphone formula audio amplifier (5)；Aerosolizer (7), built with cake, can produce a small amount of cigarette (7c), it is possible to visualise the optical track of laser beam after lighting；Laser pen (8) is fixed on glass box (1) right flank inwall near bottom position, can freely adjust its angle, its laser beam sent can be mapped to little eyeglass (4) and be reflected on right illuminator (10), then passes through nearside mirror (9), right illuminator (10) and electronic six prism illuminator (11) repeatedly roundtrip to translucent plastic screen (12)；Electronic six prism illuminators (11) are fixed on glass box (1) right flank inwall near tip position, specifically include six prism illuminators (11a), motor (11b), motor power (11c), on and off switch (11d) and speed governing knob (11e) etc., turn on the power switch (11d) and six prism illuminators (11a) can be made to rotate with motor (11b)；Translucent plastic screen (12) is attached to glass box (1) left surface inwall near tip position, specifically includes screen body (12a), rectangular coordinate (12b) and scale (12c) etc..
In conjunction with Fig. 1 and Fig. 6, the principle of the present invention is described as follows: during experiment, compact audio generator (6) can produce the signal of telecommunication of certain frequency and be transported to built-in microphone formula audio amplifier (5), built-in microphone formula audio amplifier (5) can send the sound of corresponding frequencies, resonance chamber (3a) and the prong (3b) of tuning fork (3) thus under the effect of sound, make forced vibration.Meeting resonance condition when the frequency of sound is equal to the natural frequency of tuning fork (3), now tuning fork prong (3b) vibration is the most obvious.Owing to tuning fork prong (3b) is vibrated back and forth, the laser that laser pen (8) sends can the most quickly swing after too small eyeglass (4) reflects, it is mapped on translucent plastic screen (12) after the multiple reflections of nearside mirror (9), right illuminator (10) and electronic six prism illuminators (11) again, thus has reached, in the limited space of glass box (1), the purpose that amplification is sufficiently large.Due to persistence of vision principle, its laser beam shows one " triangle clear zone " (13c) and the optical track of multiple " tetragon clear zone " (13d) in the cigarette (7c) that aerosolizer (7) produces and manifests one section " bright wisp " (13e) on translucent plastic screen (12), and concrete effect is shown in Fig. 1 and Fig. 8.When electronic six prism illuminators (11) rotate, again due to persistence of vision principle, can quickly manifest again the vibrational diagram optical track of a sine curve (13f) on translucent plastic screen (12), concrete effect is shown in Fig. 9.
(1) frequency impact on tuning fork vibration of audio amplifier sound is probed into
As shown in Figure 7, as a example by selecting the natural frequency tuning fork (3) as 440Hz, during experiment, fix each device as requested, light the cake (7b) in aerosolizer (7) send a small amount of cigarette (7c) and be diffused into whole glass box (1), open laser pen (8) power supply, now only seeing an incident ray (13a) and a plurality of reflection light (13b) in glass box (1), concrete effect is shown in Fig. 7.
As shown in Figure 1, then the signal of telecommunication allowing compact audio generator (6) send certain frequency makes built-in microphone formula audio amplifier (5) send sound, keep constant after heightening volume by volume adjustment knob (5d) as far as possible, 500Hz is increased to from 400Hz by the frequency of compact audio generator (6) the regulation signal of telecommunication, it can be seen that one " triangle clear zone " (13c) and multiple " tetragon clear zone " (13d) optical track in glass box (1), when incoming frequency is 440Hz, tuning fork (3) vibration is the most obvious, the area of " triangle clear zone " (13c) and " tetragon clear zone " (13d) optical track is the most maximum.During experiment, the natural frequency of tuning fork (3) can be changed by frequency modulation part (3c), repeat above-mentioned experimental procedure, it appeared that only when sound frequency is equal to the natural frequency of tuning fork (3), tuning fork (3) resonates.
(2) volume impact on tuning fork vibration of audio amplifier sound is probed into
In conjunction with Fig. 1 and Fig. 5, during experiment, the frequency that can keep input electrical signal is constant, the volume of built-in microphone formula audio amplifier (5) shoo is changed by volume adjustment knob (5d), it appeared that wave volume is the highest, tuning fork (3) vibration is the most obvious, and the area of " triangle clear zone " (13c) and " tetragon clear zone " (13d) optical track seen in glass box (1) is the biggest.
(3) the vibrational diagram experiment of demonstration tuning fork
In conjunction with Fig. 1 and Fig. 4, when six prism illuminators (11a) do not rotate, leaving one section of " bright wisp " (13e) optical track on translucent plastic screen (12), concrete effect is shown in Fig. 8.Rotating speed is regulated when Guan Bi electric motor power switch (11d) and by speed governing knob (11e), make six prism illuminators (11a) with motor (11b) with certain rotational speed, due to persistence of vision principle, can quickly manifest the vibrational diagram optical track of a sine curve (13f) on translucent plastic screen (12), concrete effect is shown in Fig. 9.
In a word, the double vibrational image demonstrator of this tuning fork resonance, as a kind of physical teaching aid, not only can be used to observe phenomenon during tuning fork resonance, but also can be used to demonstrate the vibrational diagram of tuning fork.This teaching aid uses audio amplifier to drive tuning fork resonance to reach the purpose persistently resonated；Light amplification principle is used to solve the little problem being difficult to directly observe of tuning fork vibration amplitude；Using persistence of vision principle, experimental principle and method are ingenious, and experimental phenomena is substantially directly perceived, embodies the science of teaching aid, pedagogical and inquiry and interest.
Claims (7)
1. the double vibrational image demonstrator of tuning fork resonance, including glass box (1), Rotatable base (2), tuning fork (3), little eyeglass (4), built-in microphone formula audio amplifier (5), compact audio generator (6), aerosolizer (7), laser pen (8), nearside mirror (9), right illuminator (10), electronic six prism illuminators (11), translucent plastic screen (12) etc..
Glass box the most according to claim 1 (1) and Rotatable base (2), it is characterized in that: glass box (1) specifically includes glass box body (1a), stretches out one's hand operation elliptical aperture (1b) and black paper (1c) etc., described black paper (1c) is pasted onto glass box (1) trailing flank inwall as black background, allow laser beam show become apparent from, described operation elliptical aperture (1b) of stretching out one's hand is located at lower half position, left side, conveniently operates the device in glass box (1)；Fixing in glass box (1) and put the devices such as tuning fork (3), built-in microphone formula audio amplifier (5), compact audio generator (6), aerosolizer (7), left and right sides inwall is pasted with nearside mirror (9) and right illuminator (10) respectively；Rotatable base (2) is contained in glass box (1) bottom, can be used to rotating transparent case (1), convenient adjustment viewing angle.
Tuning fork the most according to claim 1 (3), it is characterized in that: tuning fork (3) specifically includes resonance chamber (3a), prong (3b) and frequency modulation part (3c), the position of regulation frequency modulation part (3c) can change the natural frequency of tuning fork；Little eyeglass (4) is attached in tuning fork prong (3b), can vibrate with tuning fork prong (3b).
Built-in microphone formula audio amplifier (5) the most according to claim 1 and compact audio generator (6), it is characterized in that: built-in microphone formula audio amplifier (5) just resonance chamber (3a) to tuning fork, specifically include audio amplifier body (5a), built-in microphone (5b), audio amplifier switch (5c), volume adjustment knob (5d) and audio amplifier wiring (5e) etc.；Compact audio generator (6) specifically includes audio-frequency generator body (6a), switch (6b), coarse adjustment frequency knob (6c), fine tuning frequency knob (6d), digital display screen (6e) and output interface (6f) etc., can produce the signal of telecommunication that frequency is 0-1000Hz and be defeated by built-in microphone formula audio amplifier (5).
Aerosolizer the most according to claim 1 (7) and laser pen (8), is characterized in that: aerosolizer (7), built with cake, can produce a small amount of cigarette (7c), it is possible to visualise the optical track of laser beam after lighting；Laser pen (8) is fixed on glass box (1) right flank inwall near bottom position, can freely adjust its angle, its laser beam sent can be mapped on little eyeglass (4).
Electronic six prism illuminators (11) the most according to claim 1, it is characterized in that: electronic six prism illuminators (11) are fixed on glass box (1) right flank inwall near tip position, specifically include six prism illuminators (11a), motor (11b), motor power (11c), on and off switch (11d) and speed governing knob (11e) etc., turn on the power switch (11d) and six prism illuminators (11a) can be made to rotate with motor (11b).
Translucent plastic screen (12) the most according to claim 1, it is characterized in that: translucent plastic screen (12) is attached to glass box (1) left surface inwall near tip position, specifically includes screen body (12a), rectangular coordinate (12b) and scale (12c) etc..
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| CN201610378696.0A CN105825750A (en) | 2016-05-28 | 2016-05-28 | Tuning fork resonance and vibration image demonstration instrument |
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Application publication date: 20160803 |