CN113029320A - Method and experimental device for measuring wavelength increase of sound wave based on Lissajous figure mechanism - Google Patents
Method and experimental device for measuring wavelength increase of sound wave based on Lissajous figure mechanism Download PDFInfo
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Abstract
The invention belongs to the field of acoustic frequency attenuation measurement, and provides a method and an experimental device for measuring the wavelength increase of acoustic waves based on a Lissajous figure mechanism, wherein the method comprises the following steps: a signal generation module is adopted to generate a low-frequency electronic signal, and one path of the low-frequency electronic signal is input into an X channel of a dual-trace analog oscilloscope; the other path of sound wave is converted into sound wave after being amplified, the sound wave is transmitted to a remote sound wave sensor through a sound channel, the remote sound wave sensor converts a sound wave signal into a sound wave electronic signal, and the sound wave electronic signal is input into a Y channel of the dual-trace analog oscilloscope after being filtered and amplified; the double-trace analog oscilloscope adopts a Lissajous diagram mechanism, and calculates the value of the wave length of the sound wave increasing along with the propagation distance by calculating the frequency attenuation of the low-frequency electronic signal and the sound wave electronic signal.
Description
Technical Field
The invention belongs to the field of acoustic wavelength increase measurement, and particularly relates to a method and an experimental device for measuring acoustic wavelength increase based on a Lissajous figure mechanism.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The effect of longevity is considered as follows: during the propagation of the sound wave, the frequency of the sound wave is naturally and slowly attenuated, which is expressed as the wavelength is increased. Some people use college physics textbooks, namely, the frequency is related to a wave source and is not related to a propagation medium, and the attenuation is only amplitude reduction and frequency invariance, namely, the consensus is the natural law.
Astronomical observations of a decrease in the frequency of light waves are called red-shifts. I.e. the frequency decreases and is represented by the wavelength increase relative change Z, and Z is proportional to the propagation distance (note: red shift-hundred degrees, astronomy textbook is discussed). The supernova outbreak produced a large red shift-the wavelength increased more (note: discoverer won nobel physical prize). The sound wave exhibits wave dispersion and dispersion. In practice, it is the frequency variation. Note dispersion of wave function: baidu, "Acoustic Foundation" textbook is introduced. The study and application of sound waves has been over a history of hundreds of years. In 1842, when Doppler passes through a moving train, the sound tone of the flute changes, and the Doppler effect that the sound wave frequency changes when the sound wave frequency changes along with the distance between a sound source and an observer is obtained. The frequency changes are many phenomena, and can be described by iron syndrome like mountain.
The frequency decreases with propagation distance (attenuation): the astronomical observation result of the reduction of the frequency of the light wave is that in 1929, Hubbo observes the light wave sent by a remote galaxy for the first time, and a ground optical telescope receives the light wave, the frequency of the light wave is reduced, the wavelength is increased, and the astronomical phenomenon is caused by the reduction of the frequency and the direct proportion of the propagation distance. The observation result is proved to be that the person is witness, and no one can deny the result. And the relative amount of change in the frequency reduction is proportional to the distance traveled by the light wave (known as the harper's law) -note: the discipline is the content of the law that it is possible to approach natural laws. After the Hubble telescope transmits, larger and more redshifted celestial bodies are found in bulk.
Redshift refers to the phenomenon that the wavelength of electromagnetic radiation of an object is increased due to some reason, and the spectral line of a spectrum moves a certain distance towards the red end in a visible light wave band, namely the wavelength is lengthened and the frequency is reduced. The red shift is classified into three categories, doppler red shift, gravitational red shift, and cosmic red shift, and was originally found in the familiar visible light band, and as the knowledge of each band of the electromagnetic spectrum is progressively deeper, any increase in the wavelength of electromagnetic radiation can be referred to as a red shift. The redshift is mainly applied to the fields of physics and astronomy, and is mainly used for predicting the movement and the rule of celestial bodies.
The following are the wavelength growth evidencing materials retrieved by the inventors:
material 1: terence Dickinson z, Chen Donnie, THE UNIVERSE AND BEYOND. Fifth edition, people post press. First version of 3 months in 2015, page P122.
Material 2: [ Fa ] C. Fulam Li derivative. Liyuan translation. Volkswagen astronomy (Below) Beijing university Press, 5 months 2013, first print. P787-788
Material 3: the frequency decreases with the propagation medium: when light passes the edge of a large-mass celestial body, the frequency changes (red shift amount). The observation result of the observational scene of the astronomical observation expert of the Beijing astronomical table is as follows:
witness material whose frequency decreases with the propagation medium:
material 4: chu Yaoquan, Hu Jingyao, quasars around The seyferrothhe seyferrorgC 3516[ j ] The analytical Journal 1998,500:596-598
Material 5: professor of the astronomical system of Nanjing university publishes an article: scientific findings that the frequency of gamma rays decreases with increasing propagation distance.
Material 6: the wavelength increases more rapidly: astronomical observation of supernova outbreaks: wavelength growth is faster (astronomical science term: red shift is larger), and frequency decays rapidly as a material: the finder has won the nobel prize (can look up) for that finding.
Material 7: the propagation speed of an electromagnetic wave in a medium is frequency dependent: see the section description of wave dispersion, group velocity and phase velocity for details.
Material 8: wang and dog, et al, electromagnetic field theory basis, Qinghua university Press, 2001,2003.
P213--218
Material 9: royal family gift, etc., electromagnetic field and electromagnetic wave, journal of the university of west ampere electronics, 2004,2005, print 8 th time. P174- -178
Material 10: dispersion compensation technique, Ninhilan et al, optical communication Signal processing, electronic Industrial Press 2006, P94-100
Material 11: variation of the frequency of light waves propagating in a medium: such as positive chirp (red head purple tail) effect of the medium, the frequency of the head part of the pulse is reduced, and the frequency of the tail part is increased; negative chirp (violet head red tail) effect-the pulse head frequency increases and the tail frequency decreases. The frequency decreases generally faster at both ends of the pulse than in the middle.
Material 12: liu Zeng Ji, etc., optical fiber communication, the publishing company of the university of electronic science and technology of Western Ann, 2006, 11 th printing, P161-185
Another form of wavelength increase of mechanical waves such as acoustic waves and water waves: one phenomenon of frequency reduction (known as wave dispersion, scientific and normative parlance) is wave dispersion. In effect dispersion. In fact, the frequency is attenuated from high to low.
One of the evidence-based materials for increasing the wavelength of mechanical waves such as sound waves and water waves is the acoustic foundation of northwest university of industry (national fine courseware). The dispersion section of waves discusses, and the discussion is detailed. Wave dispersion has long been a term of expertise in relevant professions. Has been recognized by the scientific and technical circles for a long time.
The wavelength of mechanical waves such as sound waves and water waves is increased to prove the second material: hundredth search (diffuse video of wave function): the dispersion of the wave function, the video shows the process of gradually reducing the frequency, and the color of the red light is changed from dark to light. In effect, a frequency reduction (attenuation).
Sonar is used to measure submarines hidden in water. The application and research of sound waves are gradually and deeply carried out. But is the acoustic frequency weakly attenuated with distance traveled? The effect of longevity is considered as follows: the acoustic frequency is attenuated weakly with the propagation distance. But university physics, textbooks of speech processing, etc., think that the sound wave frequency is only relevant to the wave source, and is irrelevant to the propagation medium. Another scientific research sound is as follows: optical redshift-an astronomical observation that the frequency decreases with increasing propagation distance. The sound wave has a wave dispersion phenomenon. The positive and negative chirp phenomena in optical fiber communication indicate that the frequency of light waves can change when the light waves propagate in an optical medium. The light wave of the supernova outbreak has a large red shift phenomenon.
Why, if any, the phenomenon of attenuation of sound waves with propagation distance? Why did not such a change be measured, engineering and experimentally?
Possible explanations are: the change (the wavelength increase of the sound wave) is very weak, and the precision requirement cannot be met by the current measurement technology precision and processing method, so that the measurement cannot be carried out. Or theoretical analysis does not recognize this change.
In view of the fact that the current theory and technology cannot meet the requirement of measuring the accuracy of the wavelength increase of the sound wave. The invention provides a method for measuring the increase of acoustic wave wavelength of a lissajous figure and an experimental device.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a method and an experimental device for measuring the wavelength increase of the acoustic wave based on the lissajous diagram mechanism, which have simple structures and can obviously improve the measurement precision of the wavelength increase of the acoustic wave.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present invention provides a method for measuring wavelength increase of acoustic waves based on the lissajous figure mechanism.
The method for measuring the wavelength increase of the sound wave based on the Lissajous figure mechanism comprises the following steps:
a signal generation module is adopted to generate a low-frequency electronic signal, and one path of the low-frequency electronic signal is input into an X channel of a dual-trace analog oscilloscope;
the other path of sound wave is converted into sound wave after being amplified, the sound wave is transmitted to a remote sound wave sensor through a sound channel, the remote sound wave sensor converts a sound wave signal into a sound wave electronic signal, and the sound wave electronic signal is input into a Y channel of the dual-trace analog oscilloscope after being filtered and amplified;
the double-trace analog oscilloscope adopts a Lissajous diagram mechanism, and calculates the value of the wave length of the sound wave increasing along with the propagation distance by calculating the frequency attenuation of the low-frequency electronic signal and the sound wave electronic signal.
The second aspect of the present invention provides an experimental apparatus for measuring wavelength increase of acoustic waves based on the lissajous figure mechanism.
An experimental device for measuring the wavelength increase of sound waves based on the Lissajous figure mechanism comprises: the system comprises a signal generation module, a signal receiving module, a dual-trace analog oscilloscope and a control module, wherein the signal generation module is used for generating a low-frequency electronic signal, converting the low-frequency electronic signal into sound waves after amplification, the sound waves reach the signal receiving module through a sound channel, the sound waves are received and converted by the signal receiving module, and the low-frequency electronic signal generated by the signal generation module is input into the dual-trace analog oscilloscope;
the signal generating module comprises a low-frequency sine electronic signal generator, a low-frequency signal amplifier and a high-pitch loudspeaker which are sequentially connected;
the signal receiving module comprises a remote sound wave sensor, a filter and an amplifier which are connected in sequence.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the precise measurement of the increase of the acoustic wave length by utilizing the Lissajous diagram mechanism, and has the advantages of high measurement precision, low measurement cost, easy operation and high stability.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a structural diagram of an experimental apparatus for measuring wavelength increase of acoustic waves according to an embodiment of the present invention;
FIG. 2 is a series of graphs of the motion trajectories of two mutually perpendicular simple harmonic vibrations at several different frequency ratios;
fig. 3 is a waveform diagram during an acoustic wavelength increase measurement process in an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Interpretation of terms:
Lissajous-Figure (Lissajous-Figure) is a regular, stable closed curve synthesized by simple harmonic oscillations of two frequencies in mutually perpendicular directions at a simple integer ratio.
Lissajous curves (also known as Lissajous figures, Lissajous figures or Bowditch curves) are the resultant trajectories of two sinusoidal oscillations along mutually perpendicular directions.
The frequency ratio and the phase difference of the two signals can be measured by using the lissajous figure. In electricians and radio technology, lissajous figures are often observed with an oscilloscope and used to determine frequency or phase differences.
Example one
The embodiment provides a method for measuring the wavelength increase of the acoustic wave based on the lissajous figure mechanism.
As shown in fig. 3, the method for measuring wavelength increase of acoustic wave based on lissajous diagram mechanism includes:
a signal generation module is adopted to generate a low-frequency electronic signal, and one path of the low-frequency electronic signal is input into an X channel of a dual-trace analog oscilloscope;
the other path of sound wave is converted into sound wave after being amplified, the sound wave is transmitted to a remote sound wave sensor through a sound channel, the remote sound wave sensor converts a sound wave signal into a sound wave electronic signal, and the sound wave electronic signal is input into a Y channel of the dual-trace analog oscilloscope after being filtered and amplified;
the double-trace analog oscilloscope adopts a Lissajous diagram mechanism, and calculates the value of the wave length of the sound wave increasing along with the propagation distance by calculating the frequency attenuation of the low-frequency electronic signal and the sound wave electronic signal.
The signal generating module comprises a low-frequency sine electronic signal generator, a low-frequency signal amplifier and a tweeter, wherein the low-frequency sine electronic signal generator generates a low-frequency electronic signal with high stability; the low-frequency signal amplifier receives a low-frequency electronic signal sent by the low-frequency sinusoidal electronic signal generator and linearly amplifies the low-frequency electronic signal; the high pitch loudspeaker receives the amplified low frequency electronic signal sent by the low frequency signal amplifier, and converts the amplified low frequency electronic signal into sound wave to be emitted.
And adjusting the amplitudes of the X channel and the Y channel to ensure that the amplitude of a low-frequency electronic signal accessed into the dual-trace analog oscilloscope is the same as the amplitude of a sound wave electronic signal, adjusting a phase angle to synchronize the two, superposing the waveform of the low-frequency electronic signal and the waveform of the sound wave electronic signal, obtaining the period of the envelope wave which is the difference value of the frequency of the low-frequency electronic signal and the frequency of the sound wave electronic signal, wherein the difference value is a sound channel frequency attenuation value, and calculating a sound wave wavelength increasing value according to the sound channel frequency attenuation value.
The following is illustrated by one embodiment:
the frequency of the low-frequency electronic signal sent by the low-frequency sine electronic signal generator is f0The frequency of sound received by the remote acoustic wave sensor is f1Since the channel frequency attenuation is very weak. So f0And f1The difference is small. And are all sine waves. The two sine waves with small frequency difference are processed by a Lissajous chart on an oscilloscope, if the frequency of the input X-axis sine wave is completely equal to that of the input Y-axis sine wave. The phase difference is a custom, as shown in fig. 2, that does not change when 90 degrees. If the Y-axis signal frequency has very little attenuation than the X-axis signal frequency; the phase difference of the two signals increases linearly with time, becoming: the pattern phase angle is gradually increased and periodically repeated. The propagation distance is long, and the repeatability is high. The propagation distance is short and the repeatability is slow.
The attenuation of the frequency with the increase of the propagation distance can be converted from the phase angle and the number of pattern inversions and repetitions, and the wavelength increase of the acoustic wave can be calculated from the formula λ ═ uT.
General expression for the function of sinusoidal sound waves:
y0＝cos(wt-kx) (1)
the low-frequency electronic signal emitted by the signal generation module, the sound wave y0 emitted by the loudspeaker according to the function of the sinusoidal sound wave:
y0＝cos(wt-kx)
signal receiving module, acoustic signal y1 received by remote acoustic sensor:
y1＝cos(wt-vt-kx) (2)
wherein: w denotes an emission angular frequency of the emission end, k denotes a propagation constant, v denotes an angular frequency reduction value, v is very small compared to w, t denotes a propagation time, and x denotes a propagation distance.
The lissajous figure is displayed on an oscilloscope: taking the signal source signal, that is, x is 0, the formula (1) becomes
y0(x＝0)＝coswt (3)
Connected to the X-axis of the oscilloscope.
Selecting signals of measurement points: x ═ x (n); if x (0) is 0; x (1) ═ 10 meters; x (2) ═ 20 meters; x (3) ═ 30 m …
Taking a 10-meter measuring point; receiving signals: formula (2) becomes formula (4)
y1(x＝10)＝cos(wt-vt-10k) (4)
In the formula: k is a propagation constant, a known constant. 10k is called the fixed lag phase angle and can be expressed as a fixed value
10k＝n*360+B (5)
The distance of 10 meters corresponds to n wavelengths (n positive integers) of the sound wave, and the distance less than one wavelength is represented by a B phase angle less than 360 degrees.
Substituting equation (5) into equation (4) yields:
y1(x:10)＝cos(wt-vt-n*360-B) (6)
the trigonometric function 2 pi is a period and n2 pi is n periods, so equation (6) is reduced to equation (7):
y1(x:10)＝cos(wt-vt-B) (7)
and the signal of the formula (7) is connected into the Y-axis input of the oscilloscope. The lissajous figure was displayed on an oscilloscope.
If: when v is 0, equation (7) becomes equation (8):
y1(x:10)＝cos(wt-B) (8)
the frequency of two paths of signals accessed into the oscilloscope is w, the phase angle difference B is equal, and the amplitudes are the same. The Lissajous diagram corresponds to the phase difference diagram B. If B is 90 degrees. The lissajous figure on the oscilloscope is circular. If B is 0, the corresponding Lissajous diagram is a straight line with a three-phase limited inclination angle of 45 degrees.
V is a very small real number compared to w in equation (7). The Lissajous figures are displayed on an oscilloscope by the signals of the formula (7) and the formula (3). The lissajous figures were changed. The reason is that the phase angle θ: the X-axis accessed signal formula (3); and the signal switched in by the Y axis is formula (7). The difference in phase angle accumulates gradually over time. The lissajous figures show that the phase angle begins to increase gradually at B, repeating the cycle. The period of the cycle divided by the time is the value of the frequency decay.
The value of v is different for different distances.
The frequency difference becomes a phase angle accumulation: θ is Vt. (9)
From the accumulated phase angle θ and the elapsed time t, a frequency difference V is calculated.
Since the wavelength increase is very small, v is a very small amount, i.e., the angular velocity to which the wavelength increases. The cycle of the change of the phase angle of the Lissajous figure and the magnitude of the phase angle are displayed on a dual-trace oscilloscope, and the attenuation value of the frequency can be calculated. Therefore, the wavelength increase of the sound wave is measured by utilizing the Lissajous diagram mechanism, the ultra-high-precision measurement of the active and tiny change of the sound wave frequency is realized, and the wavelength increase of the sound wave is calculated according to the formula of lambda ═ uT.
The implementation steps are as follows: the acoustic source frequencies are selected as: 1000 hertz per second, horn power 100 watts. The sensor adopts a remote acoustic wave sensor (with high sensitivity) with a built-in 2-stage integrated amplifier, and measuring points are arranged every ten meters. Test field: the information building comprises 5 layers of laboratories in the Changqing school area of Shandong Master university and more than one hundred long corridors. The horn is placed in the west of the corridor. The distance of the measurement point from the west to the east of the horn.
Results the following table:
comment on test: there is a square space in 30 meters, which has an effect on the measured data. The east of the corridor is nearly hundred meters, the measured data is greatly interfered, and the stability is poor. Within ten meters, the attenuation is small, and the change of the wavelength is not easy to measure. At a given acoustic velocity, wavelength is inversely proportional to frequency. The frequency is reduced and the wavelength is increased.
Example two
The embodiment provides an experimental device for measuring the wavelength increase of the sound wave based on the lissajous figure mechanism.
As shown in fig. 1, the experimental device for measuring the wavelength increase of the acoustic wave based on the lissajous diagram mechanism comprises: the system comprises a signal generation module, a signal receiving module, a dual-trace analog oscilloscope and a control module, wherein the signal generation module is used for generating a low-frequency electronic signal, converting the low-frequency electronic signal into sound waves after amplification, the sound waves reach the signal receiving module through a sound channel, the sound waves are received and converted by the signal receiving module, and the low-frequency electronic signal generated by the signal generation module is input into the dual-trace analog oscilloscope;
the signal generating module comprises a low-frequency sine electronic signal generator, a low-frequency signal amplifier and a tweeter which are sequentially connected;
the signal receiving module comprises a remote sound wave sensor, a filter and an amplifier which are connected in sequence.
In one or more embodiments, the sound source position of the sound wave generated by the signal generation module, the sound track propagation module, the signal receiving module and the measuring point position of the dual-trace simulation oscilloscope are kept relatively static.
Specifically, the low-frequency sinusoidal electronic signal generator preferably selects a reference low-frequency electronic signal source: for generating a highly stable low frequency electronic signal. The low-frequency electronic signal is a sine signal or a cosine signal.
A low-frequency signal amplifier: the method comprises the steps of receiving a low-frequency electronic signal sent by a reference low-frequency electronic signal source, and giving linear amplification, wherein the linear amplification comprises at least one of amplitude amplification, current amplification and power amplification.
A high pitch horn: and receiving the amplified low-frequency electronic signal sent by the low-frequency signal amplifier, converting the amplified low-frequency electronic signal into sound waves, and transmitting the sound waves.
Sound channel: the space air channel for transmitting sound waves requires that sound channels transmit no air flow, no vibration and no noise. The acoustic frequency attenuation vibrator electromagnetic wave source provides sinusoidal electromagnetic waves for timing and has the characteristics of high stability and high precision.
Remote acoustic wave sensor: due to the common acoustic wave sensor, the distance for receiving the acoustic wave is not long enough. Only a distance of a few meters. The sensitivity is too low. The requirement of receiving sound waves over long distances cannot be met. Therefore, the acoustic wave processor adopting the two-stage integrated circuit amplifier in the remote acoustic wave sensor adopted by the embodiment has high sensitivity and can receive acoustic wave signals several tens of meters away.
Remote acoustic wave sensor function: and receiving the sound wave signals propagated by the sound channels, converting the sound wave signals into sound wave electronic signals, and transmitting the sound wave electronic signals to the filter.
Filters and amplifiers: and filtering and amplifying the sound wave electronic signals sent by the remote sound wave sensor to remove interference waves.
Double trace analog oscilloscope: as a display and a processor.
The dual-trace analog oscilloscope acts as a processor: and the sound wave electronic signals sent by the filter and the amplifier are sent to a Y channel of the dual-trace analog oscilloscope. And taking a low-frequency electronic signal of the reference low-frequency electronic signal source as a reference, and accessing an X channel of the dual-trace analog oscilloscope. By adjusting X, Y channel signals, the amplitudes of the two channels are the same, the phase angles are synchronous, and then the Lissajous diagrams of the two channels of signals are obtained.
The dual-trace analog oscilloscope acts as a display: the amplitude of the low-frequency electronic signal of the reference low-frequency electronic signal source is modulated to display a Lissajous figure, and the waveform phase angle is gradually increased, such as the phase angle is changed:
the angles 0-45-90-135-180-225-270-315-360 are changed and repeated, the distances are different, the repetition frequency is different, and the repetition times are in proportion to the distances.
The number of repetitions is converted into the attenuation of the frequency with the propagation distance, and the wavelength increase is calculated from λ u/f.
As can be seen from fig. 1, the acoustic wave obtained by the remote acoustic wave sensor has amplitude attenuation, frequency attenuation, wavelength increase, and actually frequency decrease.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. The method for measuring the wavelength increase of the sound wave based on the Lissajous figure mechanism is characterized by comprising the following steps of:
a signal generation module is adopted to generate a low-frequency electronic signal, and one path of the low-frequency electronic signal is input into an X channel of a dual-trace analog oscilloscope;
the other path of sound wave is converted into sound wave after being amplified, the sound wave is transmitted to a remote sound wave sensor through a sound channel, the remote sound wave sensor converts a sound wave signal into a sound wave electronic signal, and the sound wave electronic signal is input into a Y channel of the dual-trace analog oscilloscope after being filtered and amplified;
the double-trace analog oscilloscope adopts a Lissajous diagram mechanism, and calculates the value of the wave length of the sound wave increasing along with the propagation distance by calculating the frequency attenuation of the low-frequency electronic signal and the sound wave electronic signal.
2. The lissajous diagram mechanism-based method for measuring acoustic wavelength growth according to claim 1, wherein the signal generation module comprises a low frequency sinusoidal electronic signal generator, a low frequency signal amplifier and a tweeter, wherein the low frequency sinusoidal electronic signal generator generates a high stability low frequency electronic signal.
3. The method for measuring the wavelength increase of the acoustic wave based on the lissajous figure mechanism according to claim 2, wherein the low frequency signal amplifier receives the low frequency electronic signal from the low frequency sinusoidal electronic signal generator and linearly amplifies the low frequency electronic signal.
4. The lissajous figure mechanism-based method for measuring wavelength increase of sound waves according to claim 2, wherein the tweeter receives the amplified low frequency electronic signal from the low frequency signal amplifier, converts the amplified low frequency electronic signal into sound waves, and emits the sound waves.
5. The method for measuring the wavelength increase of the acoustic wave based on the lissajous figure mechanism according to claim 1, wherein the amplitudes of the X channel and the Y channel are adjusted to make the amplitude of the low-frequency electronic signal connected to the dual-trace analog oscilloscope the same as the amplitude of the acoustic electronic signal, the phase angle is adjusted to synchronize the two, the waveform of the low-frequency electronic signal and the waveform of the acoustic electronic signal are superposed, the period of the obtained envelope wave is the difference between the frequency of the low-frequency electronic signal and the frequency of the acoustic electronic signal, the difference is a vocal tract frequency attenuation value, and the acoustic wave wavelength increase value is calculated according to the vocal tract frequency attenuation value.
6. An experimental device for measuring the wavelength increase of sound waves based on the Lissajous figure mechanism is characterized by comprising: the system comprises a signal generation module, a signal receiving module, a dual-trace analog oscilloscope and a control module, wherein the signal generation module is used for generating a low-frequency electronic signal, converting the low-frequency electronic signal into sound waves after amplification, the sound waves reach the signal receiving module through a sound channel, the sound waves are received and converted by the signal receiving module, and the low-frequency electronic signal generated by the signal generation module is input into the dual-trace analog oscilloscope;
the signal generating module comprises a low-frequency sine electronic signal generator, a low-frequency signal amplifier and a high-pitch loudspeaker which are sequentially connected;
the signal receiving module comprises a remote sound wave sensor, a filter and an amplifier which are connected in sequence.
7. The experimental apparatus for measuring wavelength increase of acoustic wave based on lissajous figure mechanism according to claim 6, wherein the remote acoustic sensor employs an acoustic processor with a two-stage integrated circuit amplifier therein.
8. The experimental device for measuring the wavelength increment of the acoustic wave based on the lissajous figure mechanism according to claim 6, wherein the low-frequency sinusoidal electronic signal generator is connected to an X channel of a dual-trace analog oscilloscope, and the amplifier is connected to a Y channel of the dual-trace analog oscilloscope.
9. The experimental device for measuring the wavelength increase of the sound wave based on the lissajous figure mechanism according to claim 6, wherein the position of the sound source generating the sound wave by the signal generating module, the position of the sound channel propagation module, the position of the signal receiving module and the position of the measuring point of the dual-trace analog oscilloscope are kept relatively still.
10. The lissajous figure mechanism-based experimental apparatus for measuring wavelength increase of acoustic waves according to claim 6, wherein the dual-trace analog oscilloscope performs amplitude and phase angle adjustment on the X-channel signal and the Y-channel signal, and displays the adjustment.
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| CN114354761A (en) * | 2022-01-11 | 2022-04-15 | 重庆医科大学 | Device and method for measuring loss of acoustic waveguide |
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