CN103196539A - Method and device of sound velocity measurement - Google Patents
Method and device of sound velocity measurement Download PDFInfo
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- CN103196539A CN103196539A CN2013100943129A CN201310094312A CN103196539A CN 103196539 A CN103196539 A CN 103196539A CN 2013100943129 A CN2013100943129 A CN 2013100943129A CN 201310094312 A CN201310094312 A CN 201310094312A CN 103196539 A CN103196539 A CN 103196539A
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Abstract
The invention relates to a measurement technology of sound velocity, in particular to a method and a device of sound velocity measurement. The method and the device of the sound velocity measurement are used for solving the technical problems that an existing sound velocity measurement device and an existing sound velocity measurement method are complex in operation, poor in measurement accuracy and the like. The method of the sound velocity measurement comprises the following steps of (a) inputting a sine sound wave with a frequency of fi through the front end of a sound wave guide tube, wherein the sound wave guide tube is filled with specific gas, and the length of the sound wave guide tube is 1, and recording a phase difference phi i, between the rear end and the front end of the sound wave guide tube, of the sine sound wave; (b) changing the frequency of the sine sound wave, and measuring at least one group of values from the fi to the phi i; and (c) calculating the value of 2pi using a linear fitting method according to the obtained values from the fi to the phi i, and obtaining a sound level vs. The device of the sound velocity measurement comprises a first air chamber and a second air chamber, and further comprises the sound wave guide tube. The front end of the sound wave guide tube penetrates through a first passing hole to enter the first air chamber. The rear end of the sound wave guide tube passes a third passing hole and a second passing hole, and penetrates through the second air chamber. The method and the device of the sound velocity measurement achieve high automation of measurement, and are simple in structure and low in cost.
Description
Technical field
The present invention relates to the measuring technique of the velocity of sound, be specially a kind of method and device of measuring the velocity of sound.
Background technology
The velocity of sound in the gas and the composition of gas have very big relation, and for example the velocity of sound is 340m/s under air, but under He the velocity of sound up to 972m/s.And based on the gas sensor of optoacoustic spectroscopy be based upon gas absorption light after, in the measurement to the faint sound that discharges, common optoacoustic spectroscopy can use a sound resonance chamber, the half-wave wavelength of tested faint voice signal and this sound resonance chamber equal in length, therefore sound wave can form standing wave in the chamber, and the faint sound wave of detection is further strengthened.But under the gas componant of complexity, the variation of the velocity of sound can cause the wave length of sound acute variation, thereby the half-wave wavelength of acoustic resonance cavity length and sound wave is not matched, and sensitivity also changes, and at this moment monitoring is necessary to the velocity of sound in the tested gas.
Traditional sonic velocity measurement method has resonance interference method method and phase-comparison method, preceding a kind of be between sound wave generating device and sound wave receiving device, to produce standing wave, obtain wavelength information by the distance of measuring between two antinodes of standing wave or the node, calculate the velocity of sound again; The back is a kind of to be to change transmitted wave and receive phase differential between the ripple, changes to determine wavelength by the cycle of observing lissajous figures at oscillograph.These two kinds of methods need change the distance between sound wave generating device and the sound wave receiving device, have movable mechanical hook-up to exist, apparatus structure complexity and volume are bigger, need artificial participation in measuring process, the complex operation automaticity is not high, can not satisfy actual needs.
Summary of the invention
The present invention provides a kind of method and device of measuring the velocity of sound for solving the technical matters that present existing acoustic velocity measutement instrument and method complex operation, measuring accuracy are relatively poor, need manual intervention and can't realize real-time online measuring.
The present invention realizes by the following technical solutions: a kind of method of measuring the velocity of sound may further comprise the steps: (a) with frequency be
f iSinusoidal sound wave from the length that is full of specific gas be
lThe front end input of acoustic waveguide tube, record the phasic difference of this sound wave between acoustic waveguide tube rear end and front end
φ i, described phasic difference
φ iExpression formula be
φ i=2
π 
, in the formula
v sBe the velocity of propagation of sound wave in this gas,
bBe constant; (b) frequency of change sound wave is measured at least one group again
f i~
φ iValue; (c) according to resulting at least two groups
f i~
φ iNumerical value adopts linear fit method to calculate
φ i=2 π
Slope 2 π
Value, just obtained the velocity of propagation of sound wave in this kind gas
v s
The velocity of sound
v sWith wavelength
λAnd frequency
fThe pass be:
v s=
λ f, the generation frequency is in acoustic waveguide tube
f 1Sinusoidal sound wave the time, the periodicity of sinusoidal sound wave is in the acoustic waveguide tube:
N 1=
, the phasic difference of rear end of conduit mouth and front port can be expressed as
φ i=2
π N 1+
b=2
π 
, for frequency be
f 2Sound wave, the periodicity of sinusoidal sound wave is in the acoustic waveguide tube:
N 2=
, the phasic difference of rear end of conduit mouth and front port can be expressed as
φ 2=2
π N 2+
b=2
π 
, two formulas are subtracted each other and are obtained Δ
φ=2 π (
N 1-
N 2)=
Δ
f, Δ wherein
φ=
φ 2-
φ 1, Δ
f=
f 2-
f 1, cancellation constant
b, so just can calculate slope 2 π
Value, and then just can obtain the velocity of sound
v sValue.In the measurement in order to obtain more accurately
v sValue generally can be measured many groups
f i~
φ I,And adopt the method for linear fit to make slope 2 π
Value, calculate then
v sValue, the method for described linear fit is those skilled in the art's common practise, has multiple computing method available.
The device of the measurement velocity of sound of the present invention is to adopt following technical scheme to realize: a kind of device of measuring the velocity of sound comprises first air chamber and second air chamber which is provided with the gas access; Be provided with loudspeaker in first air chamber, loudspeaker penetrates the sound wave direction and is provided with an acoustic waveguide tube; A port of described acoustic waveguide tube is located at loudspeaker and penetrates on the sound wave direction; Described acoustic waveguide tube has first aperture near the position of this port; First aperture is provided with first microphone that is positioned at the first air chamber inside outward; Have first via hole on the sidewall of first air chamber, have second via hole and the 3rd via hole on the sidewall of second air chamber, described acoustic waveguide tube passes second air chamber through the 3rd via hole and second via hole again after first via hole passes first air chamber; The tube wall that acoustic waveguide tube is positioned at the second air chamber inside is provided with second aperture; Described second aperture is provided with second microphone that is positioned at the second air chamber inside outward; Also comprise electric signal control survey assembly; Described electric signal control survey assembly comprises the sine-wave generator that is connected with loudspeaker, the digital to analog converter that is connected with the sine-wave generator signal input part, the microprocessor that is connected with digital to analog converter and the display screen that is connected with signal output part of microprocessor; Also comprise a lock-in amplifier; The synchronous input end of described lock-in amplifier is connected with first microphone, and the signal input part of lock-in amplifier is connected with second microphone; The signal output part of lock-in amplifier is connected with an analog to digital converter; Described analog to digital converter signal output part is connected with the signal input part of microprocessor; Microprocessor is connected with the digital to analog converter signal input part by another signal output part; Be tightly connected between described acoustic waveguide tube and first via hole, second, third via hole.
Noise for fear of the external world need arrange first air chamber and second air chamber, and the part of acoustic waveguide tube near front and back end ports is placed on respectively in first, second air chamber; The length of used acoustic waveguide tube in the calculating
lShould be the distance between first aperture and second aperture.When measuring, specific gas is imported first air chamber from the gas access, gas flows out by the front end by acoustic waveguide tube to the back-end being full of first air chamber, and is full of second air chamber through second aperture; After treating the stable gas pressure in the acoustic waveguide tube, begin to measure.Be set in lock-in amplifier on the phase place output mode this moment, can directly detect the phase differential between input signal and the synchronizing signal, can obtain the phasic difference of sound wave between acoustic waveguide tube second aperture and first aperture; The digital signal of microprocessor output control sine-wave generator, digital to analog converter is converted to simulating signal with digital signal, and the sine wave of control sine-wave generator output certain frequency and amplitude makes loudspeaker send the sinusoidal sound wave of corresponding frequencies to loudspeaker; Sinusoidal sound wave is transmitted to the rear end of acoustic waveguide tube by the front end of acoustic waveguide tube, and sound wave passes to lock-in amplifier after the position of first, second port of acoustic waveguide tube phase signals converts corresponding electric signal to by first microphone and second microphone respectively; Lock-in amplifier compares the position phase signals at acoustic waveguide tube first aperture and the second aperture place, inputs to microprocessor after acoustic waveguide tube second aperture that obtains after relatively and the phasic difference signal between first aperture are converted to corresponding digital signal through analog to digital converter; Microprocessor sends the frequency that instruction changes sound wave afterwards, and second aperture after the record change frequency and the phasic difference between first aperture; So at least, record two or more
f i~
φ iData adopt the method for linear fit that data are handled, and obtain accurate acoustic velocity value
v sMicroprocessor is under the support of corresponding software, offset of sinusoidal wave producer output order, the control sine-wave generator sends the different sine wave signal of frequency, and the phasic difference information that produces of record corresponding frequencies sound wave, again these information are handled, and adopting the form of curve to show by display screen the result, the velocity of propagation of sound wave just can be seen very intuitively.Described corresponding software is known in those skilled in the art, is easy to write.The method of the deal with data that the method for used linear fit is used always for those skilled in the art has multiple concrete method to select.
A kind of device of measuring the velocity of sound comprises first air chamber and second air chamber which is provided with the gas access; Be provided with loudspeaker in first air chamber, loudspeaker penetrates the sound wave direction and is provided with an acoustic waveguide tube; A port of described acoustic waveguide tube is located at loudspeaker and penetrates on the sound wave direction; Described acoustic waveguide tube has first aperture near the position of this port; First aperture is provided with first microphone that is positioned at the first air chamber inside outward; Have first via hole on the sidewall of first air chamber, have second via hole and the 3rd via hole on the sidewall of second air chamber, described acoustic waveguide tube passes second air chamber through the 3rd via hole and second via hole again after first via hole passes first air chamber; The tube wall that acoustic waveguide tube is positioned at the second air chamber inside is provided with second aperture; Described second aperture is provided with second microphone that is positioned at the second air chamber inside outward; Also comprise electric signal control survey assembly; Described electric signal control survey assembly comprises the sine-wave generator with three signal output ports that is connected with loudspeaker, the digital to analog converter that is connected with the sine-wave generator signal input part, the microprocessor that is connected with digital to analog converter and the display screen that is connected with signal output part of microprocessor; Sine-wave generator is connected with loudspeaker by first signal output port, and second output port of sine-wave generator is connected with first phase detector; Described first phase detector is connected with sine-wave generator by a signal input part, and described first phase detector is connected with second microphone by another signal input part; The signal output part of first phase detector is connected with the 3rd phase detector; First microphone is connected with second phase detector by signal output part; The 3rd signal output port of described sine-wave generator is connected with another signal input part of second phase detector; The signal output part of described first phase detector is connected with a signal input part of the 3rd phase detector, the signal output part of second phase detector is connected with another signal input part of the 3rd phase detector, and the signal output part of the 3rd phase detector is connected with an analog to digital converter; Described analog to digital converter signal output part is connected with the signal input part of microprocessor; Microprocessor is connected with the digital to analog converter signal input part by another signal output part; Be tightly connected between described acoustic waveguide tube and first via hole, second via hole and the 3rd via hole.
At some frequency place, because the signal off resonance causes signal weaker, lock-in amplifier can't obtain the phase differential of sound wave between second aperture and first aperture very accurately, so we adopt three phase detectors to obtain the phase differential of second aperture and the first aperture place acoustic signals.At first carrying out the position by first phase detector, second phase detector with sine-wave generator respectively from the signal of the signal of first microphone and second microphone compares, two phasic differences that obtain are compared by the 3rd phase detector again, have just obtained the phasic difference of second aperture and the first aperture place sound wave.Because reference signal provides by sine-wave generator, though under the more weak situation of microphone signal also very accurate obtain between second aperture and second aperture phase information.Fig. 6 is the comparison diagram of acoustic velocity value and theoretical value in the He that adopts said apparatus and record and the CO2 combination gas, and transverse axis is the number percent of He gas in He and the CO2 combination gas among the figure, and the longitudinal axis is the velocity of sound, the m/s of unit.Square is the data point that records among the figure, and black curve is the theoretical value of calculating, as seen from the figure theoretical and experiment coincide fine.
The present invention has overcome present traditional acoustic velocity measutement device needs technical matterss such as the participation of mobile machine and complex structure be bulky, and that has realized measuring is increasingly automated, has satisfied the technical need in optoacoustic spectroscopy field.And simple in structure, with low cost, measurement result is accurate.
Description of drawings
Fig. 1 measuring principle figure of the present invention.
Structural representation when Fig. 2 device of the present invention adopts the linear pattern conduit.
Structural representation when Fig. 3 device of the present invention adopts U-shaped conduit.
Structural representation when Fig. 4 device of the present invention adopts lock-in amplifier.
Structural representation when Fig. 5 device of the present invention adopts three phase detectors.
Fig. 6 is by the velocity of sound of measurement device among Fig. 5 and the comparison of calculated value.
The 1-loudspeaker, 2-acoustic waveguide tube, the sinusoidal sound wave of 3-, 4-first air chamber, 5-first microphone, 6-second air chamber, 7-second microphone, 8-electric signal control survey part, 22-U type acoustic waveguide tube, the 41-gas access, 42-first via hole, 61-second via hole, 62-the 3rd via hole, the 81-sine-wave generator, 82-lock-in amplifier, 83-digital to analog converter, the 84-analog to digital converter, the 85-microprocessor, 86-display screen, 87-first phase detector, 88-second phase detector, 89-the 3rd phase detector, 211-first aperture, 212-second aperture.
Embodiment
A kind of method of measuring the velocity of sound may further comprise the steps: (a) with frequency be
f iSinusoidal sound wave from the length that is full of specific gas be
lThe front end input of acoustic waveguide tube, record the phasic difference of this sound wave between acoustic waveguide tube rear end and front end
φ i, described phasic difference
φ iExpression formula be
φ i=2
π 
, in the formula
v sBe the velocity of propagation of sound wave in this gas,
bBe constant; (b) frequency of change sound wave is measured at least one group again
f i~
φ iValue; (c) according to resulting at least two groups
f i~
φ iNumerical value adopts linear fit method to calculate
φ i=2 π
Slope 2 π
Value, just obtained the velocity of propagation of sound wave in this kind gas
v s
A kind of device of measuring the velocity of sound comprises first air chamber 4 and second air chamber 6 which is provided with gas access 41; Also comprise an acoustic waveguide tube 2; Have on the sidewall of first air chamber 4 on the sidewall of first via hole, 42, the second air chambers 6 and have second via hole 61 and the 3rd via hole 62, the front end of described acoustic waveguide tube 2 passes first via hole 42 and enters first air chamber 4; Second air chamber 6 is passed through the 3rd via hole 62 and second via hole 61 in the rear end of acoustic waveguide tube 2; Be provided with loudspeaker 1 in first air chamber 4, the front port of acoustic waveguide tube 2 is located at loudspeaker 1 and penetrates on the sound wave direction; Described acoustic waveguide tube 2 has first aperture 211 near the position of front port; Be provided with first microphone 5 that is positioned at first air chamber, 4 inside outside first aperture 211; The tube wall that acoustic waveguide tube 2 is positioned at second air chamber, 6 inside is provided with second aperture 212; Described second aperture, 212 outer second microphones 7 that are positioned at second air chamber, 6 inside that are provided with; Also comprise electric signal control survey assembly 8; Described electric signal control survey assembly 8 comprises the sine-wave generator 81 that is connected with loudspeaker 1, the digital to analog converter 83 that is connected with sine-wave generator 81 signal input parts, the microprocessor 85 that is connected with digital to analog converter 83 and the display screen 86 that is connected with 85 1 signal output parts of microprocessor; Also comprise a lock-in amplifier 82; The synchronous input end of described lock-in amplifier 82 is connected with first microphone 5, and the signal input part of lock-in amplifier 82 is connected with second microphone 7; The signal output part of lock-in amplifier 82 is connected with an analog to digital converter 84; Described analog to digital converter 84 signal output parts are connected with the signal input part of microprocessor 85; Microprocessor 85 is connected with digital to analog converter 83 signal input parts by another signal output part; Be tightly connected between described acoustic waveguide tube 2 and first via hole 42, second via hole 61 and the 3rd via hole 62.
A kind of device of measuring the velocity of sound comprises first air chamber 4 and second air chamber 6 which is provided with gas access 41; Also comprise an acoustic waveguide tube 2; Have on the sidewall of first air chamber 4 on the sidewall of first via hole, 42, the second air chambers 6 and have second via hole 61 and the 3rd via hole 62, the front end of described acoustic waveguide tube 2 passes first via hole 42 and enters first air chamber 4; Second air chamber 6 is passed through the 3rd via hole 62 and second via hole 61 in the rear end of acoustic waveguide tube 2; Be provided with loudspeaker 1 in first air chamber 4, the front port of acoustic waveguide tube 2 is located at loudspeaker 1 and penetrates on the sound wave direction; Described acoustic waveguide tube 2 has first aperture 211 near the position of front port; Be provided with first microphone 5 that is positioned at first air chamber, 4 inside outside first aperture 211; The tube wall that acoustic waveguide tube 2 is positioned at second air chamber, 6 inside is provided with second aperture 212; Described second aperture, 212 outer second microphones 7 that are positioned at second air chamber, 6 inside that are provided with; Described electric signal control survey assembly 8 comprises the sine-wave generator with three signal output ports 81 that is connected with loudspeaker 1, the digital to analog converter 83 that is connected with sine-wave generator 81 signal input parts, the microprocessor 85 that is connected with digital to analog converter 83 and the display screen 86 that is connected with 85 1 signal output parts of microprocessor; Sine-wave generator 81 is connected with loudspeaker 1 by first signal output port, and second output port of sine-wave generator 81 is connected with first phase detector 87; Described first phase detector 87 is connected with sine-wave generator 81 by a signal input part, and described first phase detector 87 is connected with second microphone 7 by another signal input part; The signal output part of first phase detector 87 is connected with the 3rd phase detector 89; First microphone 5 is connected with second phase detector 88 by signal output part; The 3rd signal output port of described sine-wave generator 81 is connected with another signal input part of second phase detector 88; The signal output part of described first phase detector 87 is connected with a signal input part of the 3rd phase detector 89, the signal output part of second phase detector 88 is connected with another signal input part of the 3rd phase detector 89, and the signal output part of the 3rd phase detector 89 is connected with an analog to digital converter 84; Described analog to digital converter 84 signal output parts are connected with the signal input part of microprocessor 85; Microprocessor 85 is connected with digital to analog converter 83 signal input parts by another signal output part; Be tightly connected between described acoustic waveguide tube 2 and first via hole 42, second via hole 61 and the 3rd via hole 62.
Described acoustic waveguide tube 2 is the linear pattern acoustic waveguide tube.As shown in Figure 2.Described acoustic waveguide tube 2 is U-shaped acoustic waveguide tube 22.Shown in Fig. 3,4,5; Adopt U-shaped acoustic waveguide tube 22 can save the space, be convenient to instrument miniaturization.
The length of described acoustic waveguide tube 2 is that 10cm ~ 36cm(can select 10cm, 12cm, 14cm, 16cm, 18cm, 20cm, 22cm, 24cm, 26cm, 28cm, 30cm, 32cm, 34cm, 36cm).
The length of described U-shaped acoustic waveguide tube 22 is that 10cm ~ 36cm(can select 10cm, 12cm, 14cm, 16cm, 18cm, 20cm, 22cm, 24cm, 26cm, 28cm, 30cm, 32cm, 34cm, 36cm); The bending radius of U-shaped acoustic waveguide tube 22 is not less than 3cm.The length of acoustic waveguide tube 2 is elected 10cm ~ 36cm as, not only can avoid oversize acoustic waveguide tube to cause that the instrument volume is excessive like this, and the measuring error brought of the acoustic waveguide tube that can avoid lacking very much.The bending radius of U-shaped acoustic waveguide tube 22 should be not less than 3 cm, guarantees the normal propagation in acoustic waveguide tube of sinusoidal sound wave 3.
The internal diameter of used acoustic waveguide tube should be less than the twice of transmitting wave length of sound in the pipe in the actual measurement, generally be set in 1.0-3.0mm(and can select 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm) between, so design can be crossed and be avoided sound to produce transverse mode and have influence on detection to the row ripple in the acoustic waveguide tube cross-sectional direction.Fig. 1 is measuring principle figure, and sinusoidal sound wave 3 refers to that the vibration Changing Pattern of sound wave follows sinusoidal wave characteristic, and for intuitively sinusoidal sound wave has been drawn as sinusoidal wave form, in fact sound wave is compressional wave among the figure.
Claims (9)
1. a method of measuring the velocity of sound is characterized in that, may further comprise the steps: be f with frequency (a)
iSinusoidal sound wave be the front end input of the acoustic waveguide tube of l from the length that is full of specific gas, record the phasic difference φ of this sound wave between acoustic waveguide tube rear end and front end
i, described phasic difference φ
iExpression formula be φ
i=2 π
, v in the formula
sBe the velocity of propagation of sound wave in this gas, b is constant; (b) frequency of change sound wave is measured at least one group of f again
i~ φ
iValue; (c) according to resulting at least two group f
i~ φ
iNumerical value adopts linear fit method to calculate φ
i=2 π
Slope 2 π
Value, just obtained the velocity of propagation v of sound wave in this kind gas
s
2. a device of measuring the velocity of sound is used for realizing the method for claim 1, it is characterized in that comprising first air chamber (4) and second air chamber (6) which is provided with gas access (41); Also comprise an acoustic waveguide tube (2); Have first via hole (42) on the sidewall of first air chamber (4), have second via hole (61) and the 3rd via hole (62) on the sidewall of second air chamber (6), the front end of described acoustic waveguide tube (2) passes first via hole (42) and enters first air chamber (4); Second air chamber (6) is passed through the 3rd via hole (62) and second via hole (61) in the rear end of acoustic waveguide tube (2); Be provided with loudspeaker (1) in first air chamber (4), the front port of acoustic waveguide tube (2) is located at loudspeaker (1) and penetrates on the sound wave direction; Described acoustic waveguide tube (2) has first aperture (211) near the position of front port; Be provided with one outside first aperture (211) and be positioned at inner first microphone (5) of first air chamber (4); Acoustic waveguide tube (2) is positioned at the inner tube wall of second air chamber (6) and is provided with second aperture (212); Outer being provided with of described second aperture (212) is positioned at inner second microphone (7) of second air chamber (6); Also comprise electric signal control survey assembly (8); Described electric signal control survey assembly (8) comprise the sine-wave generator (81) that is connected with loudspeaker (1), the digital to analog converter (83) that is connected with sine-wave generator (81) signal input part, the microprocessor (85) that is connected with digital to analog converter (83) and with (85) display screens that signal output part is connected of microprocessor (86); Also comprise a lock-in amplifier (82); The synchronous input end of described lock-in amplifier (82) is connected with first microphone (5), and the signal input part of lock-in amplifier (82) is connected with second microphone (7); The signal output part of lock-in amplifier (82) is connected with an analog to digital converter (84); Described analog to digital converter (84) signal output part is connected with the signal input part of microprocessor (85); Microprocessor (85) is connected with digital to analog converter (83) signal input part by another signal output part; Be tightly connected between described acoustic waveguide tube (2) and first via hole (42), second via hole (61) and the 3rd via hole (62).
3. a device of measuring the velocity of sound is used for realizing the method for claim 1, it is characterized in that comprising first air chamber (4) and second air chamber (6) which is provided with gas access (41); Also comprise an acoustic waveguide tube (2); Have first via hole (42) on the sidewall of first air chamber (4), have second via hole (61) and the 3rd via hole (62) on the sidewall of second air chamber (6), the front end of described acoustic waveguide tube (2) passes first via hole (42) and enters first air chamber (4); Second air chamber (6) is passed through the 3rd via hole (62) and second via hole (61) in the rear end of acoustic waveguide tube (2); Be provided with loudspeaker (1) in first air chamber (4), the front port of acoustic waveguide tube (2) is located at loudspeaker (1) and penetrates on the sound wave direction; Described acoustic waveguide tube (2) has first aperture (211) near the position of front port; Be provided with one outside first aperture (211) and be positioned at inner first microphone (5) of first air chamber (4); Acoustic waveguide tube (2) is positioned at the inner tube wall of second air chamber (6) and is provided with second aperture (212); Outer being provided with of described second aperture (212) is positioned at inner second microphone (7) of second air chamber (6); Also comprise electric signal control survey assembly; Described electric signal control survey assembly (8) comprise the sine-wave generator with three signal output ports (81) that is connected with loudspeaker (1), the digital to analog converter (83) that is connected with sine-wave generator (81) signal input part, the microprocessor (85) that is connected with digital to analog converter (83) and with (85) display screens that signal output part is connected of microprocessor (86); Sine-wave generator (81) is connected with loudspeaker (1) by first signal output port, and second output port of sine-wave generator (81) is connected with first phase detector (87); Described first phase detector (87) is connected with sine-wave generator (81) by a signal input part, and described first phase detector (87) is connected with second microphone (7) by another signal input part; The signal output part of first phase detector (87) is connected with the 3rd phase detector (89); First microphone (5) is connected with second phase detector (88) by signal output part; The 3rd signal output port of described sine-wave generator (81) is connected with another signal input part of second phase detector (88); The signal output part of described first phase detector (87) is connected with a signal input part of the 3rd phase detector (89), the signal output part of second phase detector (88) is connected with another signal input part of the 3rd phase detector (89), and the signal output part of the 3rd phase detector (89) is connected with an analog to digital converter (84); Described analog to digital converter (84) signal output part is connected with the signal input part of microprocessor (85); Microprocessor (85) is connected with digital to analog converter (83) signal input part by another signal output part; Be tightly connected between described acoustic waveguide tube (2) and first via hole (42), second via hole (61) and the 3rd via hole (62).
4. as the device of claim 2 or the 3 described measurement velocities of sound, it is characterized in that described acoustic waveguide tube (2) is the linear pattern acoustic waveguide tube.
5. as the device of claim 2 or the 3 described measurement velocities of sound, it is characterized in that described acoustic waveguide tube (2) is U-shaped acoustic waveguide tube (22).
6. the device of the measurement velocity of sound as claimed in claim 4 is characterized in that, the length of described acoustic waveguide tube (2) is 10cm ~ 36cm, and internal diameter is 1mm ~ 3mm.
7. the device of the measurement velocity of sound as claimed in claim 5 is characterized in that, the length of described U-shaped acoustic waveguide tube (22) is 10cm ~ 36cm, and internal diameter is 1mm ~ 3mm; The bending radius of U-shaped acoustic waveguide tube (22) is not less than 3cm.
8. the device of the measurement velocity of sound as claimed in claim 6, it is characterized in that, first aperture (211) on the described acoustic waveguide tube (2) is 0.5cm ~ 2cm with the distance of acoustic waveguide tube (2) front end, and second aperture (212) is 0.5cm ~ 2cm with the distance of acoustic waveguide tube (2) rear end; The diameter of first aperture (211) and second aperture (212) is 0.2mm ~ 2mm; Described loudspeaker (1) is 0.5 ~ 10mm with the spacing of acoustic waveguide tube (2) front end; Described first microphone (5) is 0.3 ~ 2mm with the spacing of first aperture (211), and described second microphone (7) is 0.3 ~ 2mm with the spacing of second aperture (212).
9. the device of the measurement velocity of sound as claimed in claim 7, it is characterized in that, first aperture (211) on the described U-shaped acoustic waveguide tube (22) is 0.5cm ~ 2cm with the distance of U-shaped acoustic waveguide tube (22) front end, and second aperture (212) is 0.5cm ~ 2cm with the distance of U-shaped acoustic waveguide tube (22) rear end; The diameter of first aperture (211) and second aperture (212) is 0.2mm ~ 2mm; Described loudspeaker (1) is 0.5 ~ 10mm with the spacing of acoustic waveguide tube (2) front end; Described first microphone (5) is 0.3 ~ 2mm with the spacing of first aperture (211), and described second microphone (7) is 0.3 ~ 2mm with the spacing of second aperture (212).
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| CN103994813A (en) * | 2014-04-28 | 2014-08-20 | 中国计量学院 | Small-diameter gas velocity measurement test device and test method thereof |
| CN105910696A (en) * | 2016-06-24 | 2016-08-31 | 中国航空工业集团公司西安飞机设计研究所 | Method and device for measuring sound velocity of compressible gas |
| CN106898344A (en) * | 2017-03-22 | 2017-06-27 | 中国海洋大学 | Programmable wave surface actuation means |
| CN108918661A (en) * | 2018-08-21 | 2018-11-30 | 中国科学院声学研究所东海研究站 | A kind of dusty material sonic velocity measurement method |
| CN111551243A (en) * | 2020-05-08 | 2020-08-18 | 天津大学 | Working frequency expanding method for resonance cavity hydrophone |
| CN114384155A (en) * | 2022-01-12 | 2022-04-22 | 重庆医科大学 | Measuring system and method for measuring sound velocity of medium in waveguide |
| CN114414028A (en) * | 2022-01-25 | 2022-04-29 | 重庆医科大学 | Device and method for measuring sound velocity of medium in sound wave guide tube based on sub-wavelength scale |
| CN114485896A (en) * | 2022-01-25 | 2022-05-13 | 重庆医科大学 | Waveguide tube sound velocity measuring device and method based on polyvinylidene fluoride piezoelectric film |
| RU2771969C1 (en) * | 2021-05-25 | 2022-05-16 | Алексей Николаевич Темников | Laboratory installation for measuring the sound wavelength and determining the speed of sound in the air |
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| CN103994813A (en) * | 2014-04-28 | 2014-08-20 | 中国计量学院 | Small-diameter gas velocity measurement test device and test method thereof |
| CN105910696A (en) * | 2016-06-24 | 2016-08-31 | 中国航空工业集团公司西安飞机设计研究所 | Method and device for measuring sound velocity of compressible gas |
| CN106898344A (en) * | 2017-03-22 | 2017-06-27 | 中国海洋大学 | Programmable wave surface actuation means |
| CN108918661A (en) * | 2018-08-21 | 2018-11-30 | 中国科学院声学研究所东海研究站 | A kind of dusty material sonic velocity measurement method |
| CN111551243A (en) * | 2020-05-08 | 2020-08-18 | 天津大学 | Working frequency expanding method for resonance cavity hydrophone |
| RU2771969C1 (en) * | 2021-05-25 | 2022-05-16 | Алексей Николаевич Темников | Laboratory installation for measuring the sound wavelength and determining the speed of sound in the air |
| CN114384155A (en) * | 2022-01-12 | 2022-04-22 | 重庆医科大学 | Measuring system and method for measuring sound velocity of medium in waveguide |
| CN114414028A (en) * | 2022-01-25 | 2022-04-29 | 重庆医科大学 | Device and method for measuring sound velocity of medium in sound wave guide tube based on sub-wavelength scale |
| CN114485896A (en) * | 2022-01-25 | 2022-05-13 | 重庆医科大学 | Waveguide tube sound velocity measuring device and method based on polyvinylidene fluoride piezoelectric film |
| CN114414028B (en) * | 2022-01-25 | 2023-11-24 | 重庆医科大学 | Device and method for measuring sound velocity of medium in sound waveguide tube based on sub-wavelength scale |
| CN114485896B (en) * | 2022-01-25 | 2023-11-24 | 重庆医科大学 | Waveguide sound velocity measuring device and method based on polyvinylidene fluoride piezoelectric film |
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