CN204791699U - Phonosensitive sound standing wave presentation device - Google Patents
Phonosensitive sound standing wave presentation device Download PDFInfo
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- CN204791699U CN204791699U CN201520438503.7U CN201520438503U CN204791699U CN 204791699 U CN204791699 U CN 204791699U CN 201520438503 U CN201520438503 U CN 201520438503U CN 204791699 U CN204791699 U CN 204791699U
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Abstract
The utility model discloses a phonosensitive sound standing wave presentation device, including base, standing wave tube, phonosensitive strip and speaker, the base supports the standing wave tube. The built -in smooth signal control circuit who turns into the sound size light emitting diode luminance size in the phonosensitive strip, light signal control circuit includes sound signal acquisition circuit, signal amplification circuit, light signal display circuit and multi resonant oscillation circuit. The utility model discloses it has following advantage to compare prior art: the utility model discloses a phonosensitive sound standing wave presentation device adopts double -colored emitting diode, and demonstration sound standing wave phenomenon inserts audio signal with the speaker, and everywhere air amplitude difference leads to the sound variation in size that the phonosensitive strip on the standing wave tube recorded in the standing wave tube for emitting diode luminance on the phonosensitive strip is different, convenient operation in physical demonstration experiment teaching, and the effect is obvious, compares operation safety, small in noise with traditional sound standing wave demonstration instrument.
Description
Technical field
The utility model relates to a kind of physics experiment teaching demonstration instrument, in particular a kind of phonosensitive sound standing wave apparatus for demonstrating.
Background technology
Standing wave is the two train wave superpositions that the direction of propagation is contrary by amplitude, frequency, direction of vibration are all identical; There is reflection and interfere with incident acoustic wave to form standing wave in the other end of the incident acoustic wave sent by loudspeaker in pipe.Can be observed the kerosene spray of annular splashing with Kundt tube demonstration sound standing wave, liquid vibration is the fiercest, is called antinode; The minimum point of amplitude is called node, liquid transfixion.The antinode place of standing wave in Kundt tube, air vibration is violent, and air pressure is little, thus picks up the kerosene at this place, and the kerosene at antinode place is splashed; And at the node place of standing wave, standing wave energy is minimum, and the air at antinode place, both sides is assembled to this, and air pressure is large, will press down by kerosene herein, kerosene can only be flowed to both sides (anti-node location).Final both reach mobile equilibrium, define " fountain " phenomenon seen in an experiment.By flame standing wave demonstration sound standing wave phenomenon, the local pressure that air amplitude is large is little, and the local pressure that air amplitude is little is large, causes flame height to become periodic distribution.Adjacent two antinodes (or two node) spacing is 1/2 wavelength, and the distance between antinode and node is 1/4 wavelength.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of phonosensitive sound standing wave apparatus for demonstrating, utilizes dichromatic LED luminosity to reflect sound standing wave phenomenon.
The utility model is achieved through the following technical solutions: a kind of phonosensitive sound standing wave apparatus for demonstrating, comprise base, standing wave tube, phonosensitive bar and loudspeaker, described base supports described standing wave tube, described loudspeaker is installed on an openend of described standing wave tube, described standing wave tube side is along its length provided with groove, on described groove, spacing is provided with some through holes, described phonosensitive bar is installed in described groove, described phonosensitive bar is provided with some transmitters, described transmitter correspondence is installed on described through hole, for detecting sound size.
As the further optimization of such scheme, built-in light signal control circuit sound size being converted into light emitting diode brightness size of described phonosensitive bar, described light signal control circuit comprises sound signal collecting circuit, signal amplification circuit, light signal display circuit and multi-resonant oscillating circuit.
As the further optimization of such scheme, described light signal control circuit comprises microphone MIC, electric capacity C1 and C2, resistance R0, R1, R2, R3, R4, R5 and R6, the first operational amplifier, the second operational amplifier, the first LED 1, second LED 2 and branch switch K.
As the further optimization of such scheme, described microphone is electrically connected with the reverse input end of the first operational amplifier by electric capacity C1, resistance R3, and is electrically connected with the positive input of the first operational amplifier by resistance R1 by described microphone; Described microphone is electrically connected with the reverse input end of the second operational amplifier by electric capacity C2, resistance R5, and is electrically connected with the positive input of the second operational amplifier by resistance R2 by described microphone; Parallel resistance R4 between the reverse input end of described first operational amplifier and output terminal, parallel resistance R6 between the reverse input end of described second operational amplifier and output terminal; Output terminal and first LED 1 of described first operational amplifier are electrically connected, and output terminal and second LED 2 of described second operational amplifier are electrically connected.
As the further optimization of such scheme, described multi-resonant oscillating circuit comprises electric capacity C3 and C4, resistance R7 and R9, timer and adjustable resistance R8.
As the further optimization of such scheme, described groove is equidistantly provided with some through holes.
As the further optimization of such scheme, another openend of described standing wave tube is established a screening sound baffle plate.
Compared to existing technology, the beneficial effect of a kind of phonosensitive sound standing wave apparatus for demonstrating that the utility model provides is embodied in the utility model:
1, compared with traditional flame Standing wave demonstration instrument, a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model, by loudspeaker incoming audio signal during demonstration, when signal frequency is adjusted to appropriate numerical value, will form stable standing wave in standing wave tube.Without the need to the coal gas that burns, operation demonstration safety, does not have remaining coal gas taste after demonstration.
2, a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model, the openend of standing wave tube is located at by loudspeaker, and the side of standing wave tube is provided with groove, on groove, spacing is provided with some through holes, phonosensitive bar is located in described groove, and phonosensitive bar is provided with some transmitters, transmitter correspondence is installed on described through hole, for detecting sound size.By loudspeaker incoming audio signal, conditioning signal frequency, in standing wave tube, air amplitude is everywhere different, and cause acoustic pressure different, the sound that the phonosensitive bar on standing wave tube is recorded varies in size, thus makes the light-emitting diode luminance on phonosensitive bar different.
3, a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model, built-in light signal control circuit sound size being converted into light emitting diode brightness size in phonosensitive bar.Light signal control circuit comprises sound signal collecting circuit, signal amplification circuit, light signal display circuit and multi-resonant oscillating circuit.By loudspeaker incoming audio signal, conditioning signal frequency, drives light emitting diode through signal amplification circuit, drives the first light emitting diode, during signal trough, drive the second Light emitting diode during signal wave crest.Direct feel sound standing wave phenomenon is carried out by the luminosity observing dichromatic LED, easy to operate in physics demonstration experiment teaching, successful.
4, a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model, connects multi-resonant oscillating circuit by branch switch K.By loudspeaker incoming audio signal, conditioning signal frequency, when making synchronous between concussion cycle with the sound signal collected, can control LED1 and LED2 luminescence.Recurrence interval controls by regulating the variable resistor R8 in standing wave signal display circuit, and observe the crest in standing wave process and trough, wherein, LED1 represents trough, and LED2 represents crest, can reflect sound standing wave phenomenon intuitively.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model.
Fig. 2 is the circuit theory diagrams of a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model.
Fig. 3 is the circuit theory diagrams of the multi-resonant oscillating circuit of a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model.
Embodiment
Below embodiment of the present utility model is elaborated; the present embodiment is implemented under premised on technical solutions of the utility model; give detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
See Fig. 1, it is the structural representation of a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model.A kind of phonosensitive sound standing wave apparatus for demonstrating, comprise base 4, standing wave tube 1, phonosensitive bar 2 and loudspeaker 3, base 4 supports described standing wave tube 1.Loudspeaker 3 is installed on an openend of standing wave tube 1, and standing wave tube 1 side is along its length provided with groove, and on groove, spacing is provided with some through holes, phonosensitive bar 2 is installed in groove, phonosensitive bar 2 is provided with some transmitters, and transmitter correspondence is installed on described through hole, for detecting sound size.In this preferred embodiment, an openend of described standing wave tube 1 is provided with loudspeaker 3, another openend on establish a screening sound baffle plate.And standing wave tube 1 side is along its length provided with groove, and groove is equidistantly provided with some through holes.By loudspeaker incoming audio signal, conditioning signal frequency, in standing wave tube, air amplitude is everywhere different, and cause acoustic pressure different, the sound that the phonosensitive bar 2 on standing wave tube is recorded varies in size, thus makes the light-emitting diode luminance on phonosensitive bar 2 different.
Wherein, built-in light signal control circuit sound size being converted into light emitting diode brightness size of phonosensitive bar 2, light signal control circuit comprises sound signal collecting circuit, signal amplification circuit, light signal display circuit and multi-resonant oscillating circuit.Signal acquisition circuit comprises microphone, and for collected sound signal, signal amplification circuit comprises two operational amplifier LM358, and light signal display circuit adopts dichromatic LED LED1 and LED2.Multi-resonant oscillating circuit is take timer as core multivibrator.
See the circuit theory diagrams that Fig. 2 is a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model.Light signal control circuit comprises microphone MIC, electric capacity C1 and C2, resistance R0, R1, R2, R3, R4, R5 and R6, the first operational amplifier, the second operational amplifier, the first LED 1, second LED 2, branch switch K and take timer as the multi-resonant oscillating circuit of core.Microphone MIC minus earth, positive pole is connected with resistance R0, and R0 is connected with power supply VCC.Microphone is electrically connected with the reverse input end of the first operational amplifier by electric capacity C1, resistance R3, and is electrically connected with the positive input of the first operational amplifier by resistance R1 by microphone.Microphone is electrically connected with the reverse input end of the second operational amplifier by electric capacity C2, resistance R5, and microphone is electrically connected with the positive input of the second operational amplifier by resistance R2.Parallel resistance R4 between the reverse input end of the first operational amplifier and output terminal, parallel resistance R6 between the reverse input end of the second operational amplifier and output terminal.The output terminal of the first operational amplifier and the positive pole of the first LED 1 are electrically connected, and the output terminal of the second operational amplifier is electrically connected with the positive pole of the second LED 2.
When there being sound, the anodic potentials u0 of microphone MIC will change, the voice signal that microphone collects is coupled in the first operational amplifier in chip LM358 and the second operational amplifier by electric capacity C1 and C2, resistance R1 and R2 is pull down resistor, and it act as the input end control of Electric potentials of integrated transporting discharging near 0.Resistance R4 and R6 is respectively the negative feedback resistor of the first operational amplifier and the second operational amplifier.The output terminal current potential of the first operational amplifier is u1, the output terminal of the second operational amplifier is connected with LED 2 positive pole, the output terminal current potential of the second integrated transporting discharging is u2, LED 1 and LED2 negative pole link together, and be connected with branch switch K, end points 2 is connected with position at zero point.When branch switch K and end points 2 are connected, microphones sound size has been reacted in the brightness of LED1 and LED2.
The circuit theory diagrams of the multi-resonant oscillating circuit of a kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model see Fig. 3, Fig. 3.Multi-resonant oscillating circuit is core with timer, comprises electric capacity C3 and C4, resistance R7 and R9, timer and adjustable resistance R8.
Multi-resonant oscillating circuit, is also called astable multibrator, does not have stable output state, only has two temporary stable states.After circuit is in a certain temporary stable state, can triggers voluntarily through after a while and be turned to another temporary stable state.Two temporary stable states are mutually changed voluntarily and export series of rectangular ripple.
Multi-resonant oscillating circuit can be used as square-wave generator.After switching on power, exporting supposition is high level, and electric capacity C3 charges.Charge circuit is VCC-R8-R7-C3-ground, exponentially rises, and when Vc rises to 2VCC/3, output switching activity is low level.It is low level that DIS exports, C3 discharges, discharge loop is C3-R7-DIS-ground, exponentially decline, when Vc drops to Vcc/3, output switching activity is high level, electric capacity charges again, so go round and begin again, produce vibration, can obtain by analysis: export high level time T=(R7+R8) C3ln2; Output low level time T=R7C3ln2; Oscillation period T=(R8+2R7) C3ln2.
Thus oscillation period can be regulated by adjustable resistance R8.The end points 1 in Fig. 2 is used to link together with the end points 1 in Fig. 2.When multivibrator output low level, the light emitting diode in Fig. 2 just can work; Otherwise when multivibrator exports high level, the light emitting diode in Fig. 2 can not work.When the square-wave signal regulating R8 to make multivibrator export is consistent with the audio signal frequency that microphones arrives.During owing to forming standing wave in standing wave tube, crest is different from the phase place of trough, and thus driven light emitting diode is also different, thus can show the position of standing wave crest and trough.
A kind of phonosensitive sound standing wave apparatus for demonstrating of the present utility model, connects multi-resonant oscillating circuit by branch switch K.By loudspeaker incoming audio signal, conditioning signal frequency, when making synchronous between concussion cycle with the sound signal collected, can control LED1 and LED2 luminescence.Recurrence interval controls by regulating the variable resistor R8 in standing wave signal display circuit, and observe the crest in standing wave process and trough, wherein, LED1 represents trough, and LED2 represents crest, can reflect sound standing wave phenomenon intuitively.
A kind of sound standing wave demonstrator of the present utility model, by loudspeaker incoming audio signal, when signal frequency is adjusted to appropriate numerical value, will form stable standing wave in standing wave tube.Now because air amplitude difference everywhere in standing wave tube causes sound loudness different, the sound that the phonosensitive bar on standing wave tube will be made to record varies in size, thus makes the light-emitting diode luminance on phonosensitive bar different.Direct feel sound standing wave phenomenon is carried out by the luminosity observing light emitting diode, easy to operate in physics demonstration experiment teaching, successful.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (6)
1. a phonosensitive sound standing wave apparatus for demonstrating, comprise base (4), standing wave tube (1), phonosensitive bar (2) and loudspeaker (3), described base (4) supports described standing wave tube (1), it is characterized in that: described loudspeaker (3) is installed on an openend of described standing wave tube (1), described standing wave tube (1) side is along its length provided with groove, on described groove, spacing is provided with some through holes, described phonosensitive bar (2) is installed in described groove, described phonosensitive bar (2) is provided with some transmitters, described transmitter correspondence is installed on described through hole, for detecting sound size,
Built-in light signal control circuit sound size being converted into light emitting diode brightness size of described phonosensitive bar (2), described light signal control circuit comprises sound signal collecting circuit, signal amplification circuit and light signal display circuit and multi-resonant oscillating circuit.
2. a kind of phonosensitive sound standing wave apparatus for demonstrating according to claim 1, it is characterized in that: described light signal control circuit comprises microphone MIC, electric capacity C1 and C2, resistance R0, R1, R2, R3, R4, R5 and R6, the first operational amplifier, the second operational amplifier, the first LED 1, second LED 2 and branch switch K.
3. a kind of phonosensitive sound standing wave apparatus for demonstrating according to claim 2, it is characterized in that: described microphone is electrically connected with the reverse input end of the first operational amplifier by electric capacity C1, resistance R3, and be electrically connected with the positive input of the first operational amplifier by resistance R1 by described microphone; Described microphone is electrically connected with the reverse input end of the second operational amplifier by electric capacity C2, resistance R5, and is electrically connected with the positive input of the second operational amplifier by resistance R2 by described microphone; Parallel resistance R4 between the reverse input end of described first operational amplifier and output terminal, parallel resistance R6 between the reverse input end of described second operational amplifier and output terminal; Output terminal and first LED 1 of described first operational amplifier are electrically connected, and output terminal and second LED 2 of described second operational amplifier are electrically connected.
4. a kind of phonosensitive sound standing wave apparatus for demonstrating according to claim 1, is characterized in that: described multi-resonant oscillating circuit is take timer as the multivibrator of core, comprises electric capacity C3 and C4, resistance R7 and R9, timer and adjustable resistance R8.
5. a kind of phonosensitive sound standing wave apparatus for demonstrating according to claim 1, is characterized in that: described groove is equidistantly provided with some through holes.
6. a kind of phonosensitive sound standing wave apparatus for demonstrating according to claim 1, another openend that it is characterized in that described standing wave tube (1) establishes a screening sound baffle plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520438503.7U CN204791699U (en) | 2015-06-24 | 2015-06-24 | Phonosensitive sound standing wave presentation device |
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| CN201520438503.7U CN204791699U (en) | 2015-06-24 | 2015-06-24 | Phonosensitive sound standing wave presentation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113299311A (en) * | 2021-05-20 | 2021-08-24 | 皖西学院 | Sound-light conversion array for sound control luminous standing wave experimental instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113299311A (en) * | 2021-05-20 | 2021-08-24 | 皖西学院 | Sound-light conversion array for sound control luminous standing wave experimental instrument |
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