CN114354761B - Device and method for measuring loss of acoustic waveguide tube - Google Patents
Device and method for measuring loss of acoustic waveguide tube Download PDFInfo
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Abstract
The invention belongs to the technical field of acoustic waveguides, and particularly relates to a device and a method for measuring loss of an acoustic waveguide, wherein the device comprises an acoustic wave module, an acoustic waveguide tube, an operation module and an output module; the sound wave module is used for generating sound wave signals and transmitting the sound wave signals to the sound wave guide tube for propagation, the sound wave guide tube is provided with a plurality of output ends, one of the output ends is used as a reference output end, the other output end is used as a target output end, the sound wave signals output by the reference output end and the target output end are collected, sound pressure loss is obtained through calculation, the distance between the reference output end and the target output end corresponds to the sound pressure loss, and the corresponding relation between the sound pressure loss and the propagation distance can be obtained when sound waves propagate in the sound wave guide tube. Thereby improving the accuracy of calculation of the target loss of the acoustic waveguide.
Description
Technical Field
The invention belongs to the technical field of acoustic waveguides, and particularly relates to a device and a method for measuring loss of an acoustic waveguide.
Background
The research of acoustic waveguides at home and abroad has been focused on the theoretical analysis of the structures, characteristics, elastic wave propagation and the like of various acoustic waveguides, and belongs to the acoustic category. Few applications of acoustic waveguides as means of sensing, monitoring, etc. are being studied. With the increasing maturity and widespread use of optical fiber technology, there is an interest in acoustic wave guides having a similar optical fiber structure, and acoustic waves can be propagated in the acoustic wave guide with low loss, so that future application prospects of the acoustic wave guide technology are very attractive.
The acoustic waveguide tube consists of a cladding structure consisting of a solid tube wall and a fluid medium, the essence of the research on the acoustic waveguide tube is the research on the propagation loss of sound waves in the structure, and the current calculation method of the target loss mainly comprises a cut-off method, an insertion loss method, a backscattering method and the like. The commonality of the above methods is that the connection means are built by arranging connectors, thereby reducing the losses, and then the detection means are used for detecting the signal. However, in the above method, when the sound wave propagates inside the acoustic waveguide, attenuation change of sound pressure generated by the change of the length of the acoustic waveguide cannot be obtained, and thus the calculation accuracy of the target loss is affected.
Disclosure of Invention
The invention provides a device and a method for measuring the loss of an acoustic waveguide tube, which aim to solve the technical problem of inaccurate calculation of target loss when acoustic waves propagate in the acoustic waveguide tube in the prior art
An apparatus for measuring acoustic waveguide loss, comprising:
the sound wave module is used for generating sound wave signals;
the sound wave guide tube comprises an input end, a reference output end and a target output end, the input end of the sound wave guide tube is connected with the sound wave module, and the sound wave guide tube is used for transmitting the sound wave signals; the reference output end is separated from the target output end;
the operation module is connected with the reference output end of the acoustic waveguide tube and the target output end of the acoustic waveguide tube and is used for calculating and obtaining sound pressure loss according to the sound wave signals output by the reference output end and the sound wave signals output by the target output end;
and the output module is connected with the operation module and is used for outputting the corresponding output of the first preset value and the sound pressure loss so as to acquire the corresponding relation between the distance and the sound pressure loss.
Optionally, the device further comprises a conversion module, wherein the reference output end of the acoustic waveguide tube and the target output end of the acoustic waveguide tube are connected with the operation module through the conversion module;
the conversion module is used for converting the sound wave signals output by the reference output end into reference electric signals and converting the sound wave signals output by the target output end into target electric signals;
and the operation module calculates and obtains the sound pressure loss according to the reference electric signal and the target electric signal.
Optionally, the operation module includes:
the conversion unit is connected with the conversion module and is used for converting the reference electric signal into a reference sound pressure value and converting the target electric signal into a target sound pressure value;
and the subtracting unit is connected with the converting unit and is used for carrying out difference operation on the reference sound pressure value and the target sound pressure value and obtaining the sound pressure loss.
Optionally, the acoustic wave module includes:
a signal input unit for generating a pulse signal;
the power amplifier is connected with the signal input unit and used for amplifying the pulse signal;
an impedance matcher connected with the power amplifier for providing impedance matching;
an ultrasonic transducer connected to the impedance matcher; for generating the acoustic wave signal based on the impedance matched and amplified pulse signal.
Optionally, the acoustic waveguide is fixed in a medium container through a fixed base, a fluid medium is arranged in the medium container, and the acoustic waveguide is immersed in the fluid medium in the medium container; the fluid medium within the acoustic waveguide is for conducting the acoustic signal.
Optionally, the ultrasonic transducer is fixedly arranged on the side wall of the medium container, the solid-liquid coupler is a horn-shaped solid, the large end of the solid-liquid coupler faces the ultrasonic transducer, and the small end of the solid-liquid coupler is connected with the input end of the acoustic waveguide tube.
Optionally, the device further comprises a solid-liquid coupler, wherein the input end of the solid-liquid coupler faces the ultrasonic transducer, the output end of the solid-liquid coupler is connected with the acoustic waveguide, and the solid-liquid coupler is used for transmitting the acoustic wave signals into the acoustic waveguide.
Optionally, the spacing distance between adjacent target output ends is fixed.
The invention also provides a method for measuring acoustic waveguide loss, comprising the steps of:
acquiring an acoustic wave signal, and transmitting the acoustic wave signal to an acoustic waveguide tube for conduction;
acquiring a reference sound wave signal from a reference output end preset on the sound wave guide tube, and acquiring a target sound wave signal from a target output end preset on the sound wave guide tube; converting the reference acoustic wave signal into a reference electrical signal and converting the target acoustic wave signal into a target electrical signal;
converting the reference electric signal into a reference sound pressure value, converting the target electric signal into a target sound pressure value, and obtaining a sound pressure loss by carrying out difference between the reference sound pressure value and the target sound pressure value;
and obtaining the distance between the reference output end and the target output end, thereby obtaining the corresponding relation between the distance and the sound pressure loss.
Optionally, the conversion formula of the reference sound pressure value is:wherein P is 0 For the reference sound pressure value, A 0 For the amplitude of the reference electrical signal M L On-load sensitivity of a cable for transmitting the reference electrical signal and the target electrical signal;
the conversion formula of the target sound pressure value is as follows:wherein P is 1 For the target sound pressure value, A 1 Is the amplitude of the target electrical signal.
The invention has the beneficial effects that: the invention relates to a device and a method for measuring the loss of an acoustic waveguide tube, which are characterized in that an acoustic wave module is used for generating an acoustic wave signal and transmitting the acoustic wave signal into the acoustic waveguide tube for propagation, the acoustic waveguide tube is provided with a plurality of output ends, one of the output ends is used as a reference output end, the other output end is used as a target output end, the acoustic wave signals output by the reference output end and the target output end are collected, the acoustic pressure loss is calculated, the distance between the reference output end and the target output end corresponds to the acoustic pressure loss, and the corresponding relation between the acoustic pressure loss and the propagation distance can be obtained when the acoustic wave propagates in the acoustic waveguide tube. Thereby improving the accuracy of calculation of the target loss of the acoustic waveguide.
Drawings
FIG. 1 is a schematic diagram of an apparatus for measuring acoustic waveguide loss in an embodiment of the present invention;
FIG. 2 is a flow chart of a method of measuring acoustic waveguide loss in an embodiment of the present invention;
reference numerals illustrate:
1. ultrasonic transducer
2. Solid-liquid coupler
3. Conversion module
4. Acoustic waveguide
41. Reference output terminal
42. Target output end
5. Water tank
6. Fixed base
7. Oscilloscope
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention, however, it will be apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.
The inventor finds that in the existing acoustic waveguide technology, the transmission loss of the acoustic waveguide is not accurately calculated. Reasons include:
(1) In the existing acoustic waveguide technology, fluid media are generally adopted to transmit acoustic waves, but the existing connector does not well consider the problem of solid-liquid coupling;
(2) The acoustic wave guide tube 4 for propagating the acoustic wave is not studied for the phenomenon that the acoustic wave decays along with the length of the acoustic wave guide tube 4 when propagating inside the guide tube;
(3) The problem of non-axisymmetric modes of the acoustic waveguide 4 is not considered.
All of the above affects the accuracy of the acoustic waveguide transmission loss.
In order to solve the above problems, as shown in fig. 1, an apparatus for measuring acoustic waveguide loss provided in the present invention includes an acoustic wave module, an acoustic waveguide 4, a conversion module 3, an operation module, and an output module;
the sound wave module is used for generating sound wave signals;
the sound wave guide tube 4 is provided with an input end, a reference output end 41 and a target output end 42, the input end of the sound wave guide tube 4 is connected with the sound wave module, and the sound wave guide tube 4 is used for transmitting sound wave signals; specifically, the acoustic waveguide 4 is provided with a plurality of output ends, the reference output end 41 is one of the output ends, and the other output ends are target output ends 42; the interval between the output ends is a fixed preset value.
The conversion module 3 is connected with a reference output end 41 of the acoustic waveguide tube 4 and a target output end 42 of the acoustic waveguide tube 4; the conversion module 3 is configured to convert the acoustic wave signal output by the reference output terminal 41 into a reference electrical signal, and convert the acoustic wave signal output by the target output terminal 42 into a target electrical signal;
the operation module is connected with the conversion module 3 and is used for calculating and obtaining sound pressure loss according to the reference electric signal and the target electric signal; the reference electric signal and the target electric signal are pulse signals, and the acoustic wave signals are attenuated to a certain extent after being transmitted by the acoustic waveguide tube 4, and the corresponding pulse signals are attenuated to a certain extent, so that the attenuation of sound pressure can be obtained by only calculating the reference electric signal and the target electric signal;
the output module is connected with the operation module and is used for obtaining and outputting the corresponding relation between the distance between the reference output end 41 and the target output end 42 and the sound pressure loss; in some embodiments, the output module includes an oscilloscope 7, and the oscilloscope 7 is used for displaying the attenuation of sound pressure along with the propagation distance;
specifically, the acoustic wave module comprises a signal input unit, a power amplifier, an impedance matcher, an ultrasonic transducer 1 and a solid-liquid coupler 2;
the signal input unit comprises a pulse signal generator, in some embodiments, the model of the pulse signal generator is DG800, and the signal input unit is configured to generate a pulse signal;
the power amplifier is connected with the signal input unit and is used for amplifying the pulse signal generated by the signal input unit;
the impedance matcher is connected with the power amplifier; the impedance matching is used for ensuring the integrity of the signal;
the ultrasonic transducer 1 is connected with an impedance matcher, and the impedance matcher is used for carrying out impedance matching on the ultrasonic transducer 1; the ultrasonic transducer 1 is used for generating an acoustic wave signal according to the amplified pulse signal under the condition of impedance matching; in some embodiments, the ultrasonic transducer 1 is a piezoelectric ceramic, and under the condition of impedance matching, the amplified pulse signal can be ensured to be completely input into the ultrasonic transducer 1, and the ultrasonic transducer 1 generates mechanical vibration according to the amplified pulse signal, so as to drive surrounding medium to vibrate, and generate an acoustic wave signal.
The input end of the solid-liquid coupler 2 faces the ultrasonic transducer 1, and the output end of the solid-liquid coupler 2 is connected with the acoustic waveguide 4 and used for transmitting acoustic wave signals into the acoustic waveguide 4. The function of the solid-liquid coupler 2 is to better guide the acoustic wave signal into the acoustic waveguide 4.
Specifically, the operation module includes:
a conversion unit connected with the conversion module 3 for converting the reference electric signal and the target electric signal into a reference sound pressure value and a target sound pressure value, and the conversion formula is thatWherein P is a sound pressure signal, A is the amplitude of the electrical signal;
and the subtracting unit is connected with the converting unit and is used for carrying out difference operation on the reference sound pressure value and the target sound pressure value to obtain sound pressure loss, and carrying out difference operation on the target sound pressure value P1 and the reference sound pressure value P0 to obtain sound pressure loss P1-P0.
In some embodiments, the acoustic waveguide 4 is fixed in the medium container by means of a fixing base 6, the fixing base 6 fixing the acoustic waveguide 4 itself on the one hand and placing the generating means of the ultrasonic waves (i.e. the ultrasonic transducer 1), the transmitting means (i.e. the acoustic waveguide 4) and the receiving means (i.e. the conversion module 3) in contact with each other and interfering with each other on the other hand.
The medium container is internally provided with a fluid medium, the acoustic waveguide 4 is immersed in the fluid medium inside the medium container, and the fluid medium fills the internal space of the acoustic waveguide 4. For example, the medium container is a water tank 5, the fluid medium is water, and the acoustic waveguide 4 is immersed in the water so that the acoustic wave propagates in the water. The ultrasonic transducer 1 is fixedly arranged on the wall of the water tank 5, the solid-liquid coupler 2 is a horn-shaped solid, the large end of the solid-liquid coupler 2 faces the ultrasonic transducer 1, and the small end of the solid-liquid coupler 2 is connected with the input end of the acoustic waveguide tube 4.
Specifically, 7 output ends are arranged on the acoustic waveguide tube 4, the output ports are distributed on two sides of the acoustic waveguide tube 4, 3 output ports are arranged on each side, the two output ports are distributed in a staggered mode, one end of the acoustic wave pipeline is an input port, and the other end of the acoustic wave pipeline is a seventh output port; the distance between the output ports is 30cm, so that errors caused by signal interference generated by the fact that the distance between the output ports is too close can be prevented, and the fact that the attenuation distance of sound waves is too large can be prevented. The output ports are selected to be distributed on two sides of the waveguide tube in an oblique symmetry mode so as to prevent sound waves from propagating in the waveguide tube and generating a non-axisymmetric mode, thereby affecting the accuracy of a measurement result.
The acoustic waveguide 4 is fixed at the central position of the water tank 5 through the fixed base 6 and is not contacted with the wall of the water tank 5, the input end of the acoustic waveguide is provided with a solid-liquid coupler 2, the ultrasonic transducer 1 is fixed with the wall of the water tank 5, and the ultrasonic transducer 1 is opposite to the solid-liquid coupler 2 and has a phase difference of about 5 cm; two conversion modules 3 (namely piezoelectric hydrophones) are arranged at the output end of the acoustic waveguide tube 4, wherein one piezoelectric hydrophone is arranged at the first output port of the acoustic waveguide tube 4, and the output port is taken as a reference output port 41; the other piezoelectric hydrophone is arranged at any other output port which is taken as a target output port 42; the two piezoelectric hydrophones extend into the output port at a position of 2cm and are not contacted with the pipe wall; the signal input unit, the power amplifier, the impedance matcher, the operation module and the output module are arranged outside the water tank 5, wherein the operation module and the output module are actually oscilloscopes 7, and are realized by utilizing the operation and display functions of the oscilloscopes 7.
The solid-liquid coupler 2 is made of high-impedance solid material, and the fluid medium in the acoustic waveguide tube 4 is low-impedance water, so that the solid-liquid coupler 2 has the function of enabling sound waves to better propagate into the waveguide tube, and is designed into a wide-mouth horn shape, the design increases the acoustic contact angle between the coupler and the ultrasonic transducer 1, reduces the contact angle between the medium water in the tube and the coupler, and enables the acoustic waves to be transmitted more effectively.
In some embodiments, the conversion module 3 is a piezoelectric hydrophone, such as a piezoelectric hydrophone model number RESON TC 4035.
Based on an apparatus for measuring the loss of the acoustic waveguide 4 in this embodiment, as shown in fig. 2, this embodiment further provides a method for measuring the loss of the acoustic waveguide 4, including the steps of:
s1, generating burst pulse signals through a signal input unit, wherein the burst pulse signals are sinusoidal pulses, the number of the pulses is 2, and the repetition frequency is controlled to be low, so that the mutual noninterference between the two pulses is ensured. The power amplifier amplifies the pulse signal, and then the amplified pulse signal is used for effectively applying the formed driving signal to the ultrasonic transducer 1 through the impedance matching network, so that the reverse power is reduced, and the system power loss and the system heating and damage caused by the reverse power are reduced. The ultrasonic transducer 1 is piezoelectric ceramics, and generates mechanical vibration under the action of a driving signal, so that surrounding media (namely water molecules) are driven to vibrate, acoustic wave signals propagating in water are generated, and the acoustic wave signals enter the acoustic waveguide tube 4 for propagation under the action of the solid-liquid coupler 2.
S2, the sound wave propagates along the sound waveguide tube 4, firstly, a reference sound wave signal is obtained through a first output port (namely a reference output port 41), the corresponding piezoelectric hydrophone is converted into a reference electric signal, the reference electric signal is sent to the oscilloscope 7, and the amplitude of the reference electric signal is A0;
the sound wave continues to propagate until a target sound wave signal is obtained through a piezoelectric hydrophone corresponding to the other output port (namely, the target output port 42), the sound wave signal is converted into a target electric signal, the target electric signal is sent to the oscilloscope 7, and the amplitude of the target electric signal is A1;
the amplitudes of the electric signals generated by the sound waves transmitted to other output ports are measured in the same mode, wherein the amplitudes are respectively A2, A3, A4, A5 and A6;
s3, converting the reference electric signal into a reference sound pressure value, converting the target electric signal into a target sound pressure value, and obtaining a sound pressure loss by carrying out difference between the reference sound pressure value and the target sound pressure value;
the conversion formula of the reference sound pressure value is:wherein P is 0 For reference sound pressure value, A 0 For the amplitude of the reference electrical signal, M L On-load sensitivity of the cable for transmitting the reference electrical signal and the target electrical signal;
the conversion formula of the target sound pressure value is:wherein P is 1 For the target sound pressure value, A 1 Is the amplitude of the target electrical signal;
similarly, sound pressures of other output ports are obtained;
the sound pressure loss of the output port is P2, P3, P4, P5 and P6; therefore, the sound pressure loss of the output port is respectively: P1-P0, P2-P0, P3-P0, P4-P0, P5-P0 and P6-P0;
s4, obtaining the distance L between the reference output end 41 port and all other ports, wherein the distance L is the distance between two output ports along the axis of the acoustic waveguide 4, for example, the distance between the reference output end 41 port and the target output end 42 port is L1, and the distances between the reference output end 41 port and all other output ports are L2, L3, L4, L5 and L6 respectively; the sound pressure loss corresponds to the distance, and six two-dimensional data can be obtained, which are respectively: { L1, (P1-P0) }, { L2, (P2-P0) }, { L3, (P3-P0) }, { L4, (P4-P0) }, { L5, (P5-P0) } and { L6, (P6-P0) }; and placing the 6 two-dimensional data in a two-dimensional coordinate with the distance as a horizontal axis and the sound pressure loss as a vertical axis, connecting lines, and fitting to obtain a corresponding relation curve of the sound pressure loss and the propagation distance.
The following points can be well solved by the device and the invention in the embodiment:
(1) The device is provided with the solid-liquid coupler 2, so that the coupling problem of the solid tube wall of the waveguide tube and the fluid medium in the solid tube wall can be well considered;
(2) The fact that the plurality of output ports of the acoustic waveguide tube 4 are in an asymmetric structure considers the axisymmetric mode problem of the acoustic waveguide tube 4;
(3) The measuring method can finally obtain the attenuation change condition of the whole length, namely the change condition of the loss of the acoustic waveguide tube 4 along with the propagation distance;
in summary, according to the device and the method for measuring the acoustic waveguide loss, the signal input unit generates the pulse signal, and the pulse signal drives the ultrasonic transducer 1 to mechanically vibrate and generate the acoustic signal after amplification and impedance matching; the sound wave signal propagates into the sound wave guide tube 4 through the solid-liquid coupler 2, the sound wave guide tube 4 is provided with a plurality of output ends, one of the output ends is used as a reference output end 41, the other is used as a target output end 42, the sound wave signals output by the reference output end 41 and the target output end 42 are collected, the sound pressure loss is calculated, the distance between the reference output end 41 and the target output end 42 corresponds to the sound pressure loss, and the corresponding curve relationship between the loss and the propagation distance can be obtained when the sound wave propagates in the sound wave guide tube 4. Thereby improving the accuracy of calculation of the target loss of the acoustic waveguide 4.
In the above embodiments, while the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description. The embodiments of the invention are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. An apparatus for measuring acoustic waveguide loss, comprising:
the sound wave module is used for generating sound wave signals;
the sound wave guide tube comprises an input end, a reference output end and a target output end, the input end of the sound wave guide tube is connected with the sound wave module, and the sound wave guide tube is used for transmitting the sound wave signals; the reference output end is separated from the target output end;
the operation module is connected with the reference output end of the acoustic waveguide tube and the target output end of the acoustic waveguide tube and is used for calculating and obtaining sound pressure loss according to the sound wave signals output by the reference output end and the sound wave signals output by the target output end;
the output module is connected with the operation module and is used for outputting a first preset value and the sound pressure loss correspondingly so as to acquire the corresponding relation between the distance and the sound pressure loss, and the interval between the output ends is the first preset value;
the sound wave guide tube is provided with a plurality of output ends, one of the reference output ends is arranged, the other output ends are the target output ends, 7 output ends are arranged on the sound wave guide tube and distributed on two sides of the sound wave guide tube, 3 output ends are arranged on each side and distributed on two sides in a staggered mode, one end of the sound wave guide tube is an input end, and the other end of the sound wave guide tube is a seventh output end.
2. The apparatus for measuring acoustic waveguide loss according to claim 1, further comprising a conversion module, wherein the reference output end of the acoustic waveguide and the target output end of the acoustic waveguide are connected to the operation module through the conversion module;
the conversion module is used for converting the sound wave signals output by the reference output end into reference electric signals and converting the sound wave signals output by the target output end into target electric signals;
and the operation module calculates and obtains the sound pressure loss according to the reference electric signal and the target electric signal.
3. An apparatus for measuring acoustic waveguide loss according to claim 2, wherein said operation module comprises:
the conversion unit is connected with the conversion module and is used for converting the reference electric signal into a reference sound pressure value and converting the target electric signal into a target sound pressure value;
and the subtracting unit is connected with the converting unit and is used for carrying out difference operation on the reference sound pressure value and the target sound pressure value and obtaining the sound pressure loss.
4. An apparatus for measuring acoustic waveguide loss according to claim 1, wherein said acoustic wave module comprises:
a signal input unit for generating a pulse signal;
the power amplifier is connected with the signal input unit and used for amplifying the pulse signal;
an impedance matcher connected with the power amplifier for providing impedance matching;
an ultrasonic transducer connected to the impedance matcher; for generating the acoustic wave signal based on the impedance matched and amplified pulse signal.
5. The apparatus for measuring acoustic waveguide loss according to claim 4, further comprising a solid-liquid coupler having an input end directed toward said ultrasonic transducer, an output end of said solid-liquid coupler being connected to said acoustic waveguide, said solid-liquid coupler being adapted to transfer said acoustic signal into said acoustic waveguide.
6. The device for measuring loss of an acoustic waveguide according to claim 5, wherein the acoustic waveguide is fixed in a medium container by a fixing base, a fluid medium is provided in the medium container, and the acoustic waveguide is immersed in the fluid medium in the medium container; the fluid medium within the acoustic waveguide is for conducting the acoustic signal.
7. The device for measuring loss of an acoustic waveguide according to claim 6, wherein the ultrasonic transducer is fixedly disposed on a side wall of the medium container, the solid-liquid coupler is a horn-shaped solid, a large end of the solid-liquid coupler faces the ultrasonic transducer, and a small end of the solid-liquid coupler is connected with an input end of the acoustic waveguide.
8. A method of measuring acoustic waveguide loss, comprising the steps of:
acquiring an acoustic wave signal, and transmitting the acoustic wave signal to an acoustic waveguide tube for conduction;
acquiring a reference sound wave signal from a reference output end preset on the sound wave guide tube, and acquiring a target sound wave signal from a target output end preset on the sound wave guide tube; converting the reference acoustic wave signal into a reference electrical signal and converting the target acoustic wave signal into a target electrical signal;
converting the reference electric signal into a reference sound pressure value, converting the target electric signal into a target sound pressure value, and obtaining a sound pressure loss by carrying out difference between the reference sound pressure value and the target sound pressure value;
obtaining the distance between the reference output end and the target output end, thereby obtaining the corresponding relation between the distance and the sound pressure loss;
the sound wave guide tube is provided with a plurality of output ends, one of the reference output ends is arranged, the other output ends are the target output ends, 7 output ends are arranged on the sound wave guide tube and distributed on two sides of the sound wave guide tube, 3 output ends are arranged on each side and distributed on two sides in a staggered mode, one end of the sound wave guide tube is an input end, and the other end of the sound wave guide tube is a seventh output end.
9. The method of measuring acoustic waveguide loss according to claim 8, wherein the conversion formula of the reference sound pressure value is:wherein P is 0 For the reference sound pressure value, A 0 For the amplitude of the reference electrical signal M L On-load sensitivity of a cable for transmitting the reference electrical signal and the target electrical signal;
the conversion formula of the target sound pressure value is as follows:wherein P is 1 For the target sound pressure value, A 1 Is the amplitude of the target electrical signal.
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