CN114354761A - Device and method for measuring loss of acoustic waveguide - Google Patents
Device and method for measuring loss of acoustic waveguide Download PDFInfo
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Abstract
The invention belongs to the technical field of acoustic waveguide, and particularly relates to a device and a method for measuring the loss of an acoustic waveguide, wherein the device comprises an acoustic module, the acoustic waveguide, an operation module and an output module; the sound wave module is used for generating sound wave signals and sending the sound wave signals to the sound wave guide pipe for transmission, the sound wave guide pipe is provided with a plurality of output ends, one of the output ends serves as a reference output end, the other output end serves 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 transmission distance when the sound waves are transmitted in the sound wave guide pipe can be obtained. Thereby improving the accuracy of the 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 on acoustic wave guides at home and abroad has been focused on theoretical analysis of structures, characteristics, elastic wave propagation and the like of various acoustic wave guides, and belongs to the acoustic category. The application research of the acoustic waveguide as a sensing and monitoring means is seldom related. With the increasing maturity and widespread use of optical fiber technology, there is an interest in acoustic waveguides with similar optical fiber structures, in which acoustic waves can propagate with low loss, and the future application prospect of such acoustic waveguide technology is very attractive.
The acoustic waveguide is composed of a cladding structure composed of a solid tube wall and a fluid medium, the essence of the research on the acoustic waveguide is the research on the propagation loss of the acoustic wave in the structure, and the current target loss calculation methods mainly include a truncation method, an insertion loss method, a backscattering method and the like. The common feature of the above methods is that a connector is arranged to build a connection device, so as to reduce loss, and then a detection device is used to detect signals. However, the above method cannot obtain the attenuation change of the sound pressure along with the change of the length of the acoustic waveguide when the acoustic wave propagates inside the acoustic waveguide, thereby affecting the calculation accuracy of the target loss.
Disclosure of Invention
The invention provides a device and a method for measuring the loss of an acoustic waveguide, which aim to solve the technical problem that the target loss is not accurately calculated when the acoustic wave propagates in the acoustic waveguide in the prior art
An apparatus for measuring acoustic waveguide loss, comprising:
the sound wave module is used for generating a sound wave signal;
an acoustic waveguide comprising an input, a reference output, and a target output, the input of the acoustic waveguide being connected to the acoustic module, the acoustic waveguide being configured to propagate the acoustic signal; the reference output end is distant from the target output end;
the operation module is connected with the reference output end of the sound wave guide pipe and the target output end of the sound wave guide pipe and used for calculating and obtaining sound pressure loss according to the sound wave signal output by the reference output end and the sound wave signal output by the target output end;
and the output module is connected with the operation module and used for correspondingly outputting the first preset value and the sound pressure loss so as to obtain the corresponding relation between the distance and the sound pressure loss.
Optionally, the apparatus further comprises a conversion module, and the reference output end of the acoustic waveguide and the target output end of the acoustic waveguide are connected with the operation module through the conversion module;
the conversion module is used for converting the sound wave signal output by the reference output end into a reference electric signal and converting the sound wave signal output by the target output end into a target electric signal;
and the operation module calculates to obtain 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 subtraction unit is connected with the conversion unit and is used for carrying out difference calculation on the reference sound pressure value and the target sound pressure value and obtaining the sound pressure loss.
Optionally, the 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;
the impedance matcher is connected with the power amplifier and is used for providing impedance matching;
the ultrasonic transducer is connected with 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 fixing 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 disposed on a sidewall 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 to an input end of the acoustic waveguide.
Optionally, the apparatus further includes a solid-liquid coupler, an input end of the solid-liquid coupler faces the ultrasonic transducer, an output end of the solid-liquid coupler is connected with the acoustic waveguide, and the solid-liquid coupler is configured to transmit the acoustic signal into the acoustic waveguide.
Optionally, the separation distance between adjacent target output ends is fixed.
The invention also provides a method for measuring the loss of the acoustic waveguide, which comprises the following steps:
acquiring an acoustic wave signal, and sending the acoustic wave signal to an acoustic wave guide pipe for conduction;
acquiring a reference sound wave signal from a reference output end preset on the sound wave guide pipe, and acquiring a target sound wave signal from a target output end preset on the sound wave guide pipe; converting the reference sound wave signal into a reference electric signal and converting the target sound wave signal into a target electric signal;
converting the reference electric signal into a reference sound pressure value, converting the target electric signal into a target sound pressure value, and calculating the difference between the reference sound pressure value and the target sound pressure value to obtain sound pressure loss;
and acquiring the distance between the reference output end and the target output end so as to acquire the corresponding relation between the distance and the sound pressure loss.
Optionally, the conversion formula of the reference sound pressure value is:
wherein P is0Is the reference sound pressure value, A0Is the amplitude of said reference electrical signal, MLA load sensitivity for a cable used to transmit the reference electrical signal and the target electrical signal;
the conversion formula of the target sound pressure value is as follows:
wherein P is1Is the target sound pressure value, A1Is the amplitude of the target electrical signal.
The invention has the beneficial effects that: according to the device and the method for measuring the loss of the sound wave guide pipe, the sound wave module generates a sound wave signal, the sound wave signal is sent to the sound wave guide pipe to be transmitted, the sound wave guide pipe is provided with a plurality of output ends, one of the output ends serves as a reference output end, the other output end serves as a target output end, the sound wave signals output by the reference output end and the target output end are collected, the 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 transmission distance when the sound wave is transmitted in the sound wave guide pipe can be obtained. Thereby improving the accuracy of the 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 accordance with an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method of measuring acoustic waveguide loss in an embodiment of the present invention;
the reference numbers illustrate:
1 ultrasonic transducer
2 solid-liquid coupler
3 conversion module
4 Acoustic waveguide
41 reference output terminal
42 target output
5 Water tank
6 fixed base
7 oscilloscope
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
In the following description, numerous details are set forth 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 the transmission loss calculation of the acoustic waveguide is not accurate enough in the existing acoustic waveguide technology. The reasons include:
(1) in the existing acoustic waveguide technology, a fluid medium is generally adopted to transmit acoustic waves, but the problem of solid-liquid coupling is not well considered in the existing connector;
(2) for the acoustic waveguide 4 which transmits the acoustic wave, the phenomenon that the acoustic wave attenuates along with the length of the acoustic waveguide 4 when the acoustic wave propagates in the waveguide is not researched;
(3) the problem of non-axisymmetric modes of the acoustic waveguide 4 is not taken into account.
The above reasons all affect the accuracy of the transmission loss of the acoustic waveguide.
In order to solve the above problem, as shown in fig. 1, the apparatus for measuring the loss of an acoustic waveguide provided in the present invention includes an acoustic module, an acoustic waveguide 4, a conversion module 3, an operation module and an output module;
the sound wave module is used for generating a sound wave signal;
the acoustic waveguide 4 is provided with an input end, a reference output end 41 and a target output end 42, the input end of the acoustic waveguide 4 is connected with the acoustic module, and the acoustic waveguide 4 is used for transmitting acoustic signals; specifically, the acoustic waveguide 4 is provided with a plurality of output terminals, the reference output terminal 41 is one of the output terminals, and the other output terminals are the target output terminals 42; the distance 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 4 and a target output end 42 of the acoustic waveguide 4; the conversion module 3 is used for converting the acoustic wave signal output by the reference output end 41 into a reference electric signal and converting the acoustic wave signal output by the target output end 42 into a target electric signal;
the operation module is connected with the conversion module 3 and 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 both pulse signals, and the acoustic wave signals are attenuated to a certain extent through the propagation of the acoustic wave guide tube 4, and the corresponding pulse signals are also attenuated to a certain extent, so that the attenuation of sound pressure can be obtained only by calculating the reference electric signal and the target electric signal;
the output module is connected with the operation module and 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 comprises an oscilloscope 7, and the attenuation of the sound pressure along with the propagation distance is displayed by the oscilloscope 7;
specifically, the sound 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, wherein in some embodiments, the model of the pulse signal generator is DG800, and the signal input unit is used for generating a pulse signal;
the power amplifier is connected with the signal input unit and used for amplifying the pulse signal generated by the signal input unit;
the impedance matcher is connected with the power amplifier; the impedance matching has the function of ensuring the integrity of signals;
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 a surrounding medium to vibrate and generate a sound 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 sound wave guide tube 4 and used for transmitting the sound wave signals into the sound wave guide tube 4. The solid-liquid coupler 2 serves to better direct the acoustic signal into the acoustic waveguide 4.
Specifically, the operation module includes:
a conversion unit connected with the conversion module 3 for converting the reference electrical signal and the target electrical signal into a reference sound pressure value and a target sound pressure value according to the conversion formula
Wherein P is a sound pressure signal, and A is the amplitude of the electrical signal;
and the subtraction unit is connected with the conversion unit and is used for carrying out difference operation on the reference sound pressure value and the target sound pressure value to obtain the sound pressure loss, and carrying out difference operation on the target sound pressure value P1 and the reference sound pressure value P0 to obtain the sound pressure loss P1-P0.
In some embodiments, the acoustic waveguide 4 is fixed inside 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 ultrasound waves (i.e. the ultrasound transducer 1), the transmitting means (i.e. the acoustic waveguide 4) and the receiving means (i.e. the transducer module 3) in contact with each other and interfering with each other on the other hand.
The fluid medium is arranged in the medium container, the acoustic wave guide tube 4 is immersed in the fluid medium in the medium container, and the fluid medium fills the inner space of the acoustic wave guide tube 4. For example, the medium container is a water tank 5, the fluid medium is water, and the acoustic waveguide 4 is submerged in the water so that the acoustic waves propagate 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 sound wave guide tube 4.
Specifically, 7 output ends are arranged on the acoustic waveguide 4, the output ends are distributed on two sides of the acoustic waveguide 4, 3 output ends are arranged on each side, the two output ends are distributed in a staggered mode, one end of the acoustic pipeline is an input end, and the other end of the acoustic pipeline is a seventh output end; the distance between the output ports is 30cm, so that errors caused by signal interference due to too short distance between the output ports can be prevented, and the phenomenon that the distance is too large and the sound wave attenuation distance is not long enough can be prevented. The output ports are selected to be obliquely and symmetrically distributed on two sides of the waveguide tube so as to prevent the sound wave from propagating in the waveguide tube to generate a non-axisymmetric mode, thereby influencing the accuracy of the 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 waveguide is provided with a solid-liquid coupler 2, the ultrasonic transducer 1 is fixed on the wall of the water tank 5, and the ultrasonic transducer 1 is opposite to the solid-liquid coupler 2 with the difference of about 5 cm; two conversion modules 3 (namely piezoelectric hydrophones) are arranged at the output end of the acoustic waveguide 4, wherein one piezoelectric hydrophone is arranged at the first output port of the acoustic waveguide 4, and the output port is used as a reference output port 41; the other piezoelectric hydrophone is arranged at any other output port, and the port is used as a target output port 42; the two piezoelectric hydrophones extend to the position 2cm away from the output port and are not in contact with the pipe wall; the water tank 5 is externally provided with a signal input unit, a power amplifier, an impedance matcher, an operation module and an output module, wherein the operation module and the output module are both oscilloscopes 7 actually, and the operation and display functions of the oscilloscopes 7 are utilized for implementation.
The solid-liquid coupler 2 is made of high-impedance solid materials, and the fluid medium in the sound wave guide pipe 4 is water with low impedance, so that the solid-liquid coupler 2 has the effects that sound waves can be better transmitted into the sound wave guide pipe, the shape is designed to be in a wide-mouth horn shape, the sound contact angle between the coupler and the ultrasonic transducer 1 is increased through the design, the contact angle between the medium water in the pipe and the coupler is reduced, and the sound waves can be more effectively transmitted.
In some embodiments, the conversion module 3 is a piezoelectric hydrophone, for example a piezoelectric hydrophone of the model RESON TC 4035.
Based on the apparatus for measuring the loss of the acoustic waveguide 4 in the present embodiment, as shown in fig. 2, the present embodiment further provides a method for measuring the loss of the acoustic waveguide 4, including the steps of:
and S1, generating a burst pulse signal through the signal input unit, wherein the burst pulse signal is a sine pulse, the number of the pulses is 2, and the repetition frequency is controlled to be low, so that mutual interference between the two pulses is ensured. The power amplifier amplifies the power of the pulse signal, and then the amplified pulse signal effectively applies 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 ceramic, and generates mechanical vibration under the action of a driving signal, so that a surrounding medium (namely water molecules) is driven to vibrate, a sound wave signal transmitted in water is generated, and the sound wave signal enters the sound wave guide tube 4 to be transmitted under the action of the solid-liquid coupler 2.
S2, the sound wave is transmitted along the sound wave guide tube 4, firstly, the corresponding piezoelectric hydrophone obtains a reference sound wave signal through a first output port (namely, a reference output port 41), the reference sound wave signal is converted into a reference electric signal, and the reference electric signal is sent to the oscilloscope 7 and is a pulse signal, and the amplitude value of the pulse signal is A0;
the sound wave continues to propagate until a target sound wave signal is obtained through the piezoelectric hydrophone corresponding to the other output port (namely the target output port 42), and the target sound wave signal is converted into a target electric signal and sent to the oscilloscope 7, wherein the target electric signal is a pulse signal, and the amplitude value of the pulse signal is A1;
in the same way, the amplitudes of the electric signals generated by the sound waves transmitted to other output ports are measured, and 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 calculating the difference between the reference sound pressure value and the target sound pressure value to obtain sound pressure loss;
the conversion formula of the reference sound pressure value is as follows:
wherein P is0As a reference sound pressure value, A0Is the amplitude of the reference electrical signal, MLThe on-load sensitivity of the cable used to transmit the reference electrical signal and the target electrical signal;
the conversion formula of the target sound pressure value is as follows:
wherein P is1Is a target sound pressure value, A1Is the amplitude of the target electrical signal;
similarly, obtaining the sound pressure of other output ports;
the sound pressure loss of the output port is P2, P3, P4, P5 and P6; therefore, the sound pressure loss at the output port is: P1-P0, P2-P0, P3-P0, P4-P0, P5-P0 and P6-P0;
s4, obtaining distances L between the reference output port 41 and all other ports, where the distance L is a distance between two output ports along the axis of the acoustic waveguide 4, for example, the distance between the reference output port 41 and the target output port 42 is L1, and the distances between the reference output port 41 and the other output ports are L2, L3, L4, L5, and L6, respectively; the sound pressure loss corresponds to the distance, so that 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 the lines, and fitting to obtain a corresponding relation curve of the sound pressure loss and the propagation distance.
The device and the invention in the embodiment can well solve the following problems:
(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 plurality of output ports of the acoustic waveguide 4 adopt an asymmetric structure, so that the problem of the axisymmetric mode of the acoustic waveguide 4 is considered;
(3) the measurement method can finally obtain the attenuation change condition of the whole length, namely the change condition of the loss of the acoustic waveguide 4 along with the propagation distance;
in summary, in the device and method for measuring the loss of the acoustic waveguide in the present invention, 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 acoustic wave signal is transmitted to the acoustic wave guide tube 4 through the solid-liquid coupler 2, the acoustic wave guide tube 4 is provided with a plurality of output ends, one of the output ends serves as a reference output end 41, the other output end serves as a target output end 42, the acoustic wave signals output by the reference output end 41 and the target output end 42 are collected, acoustic pressure loss is obtained through calculation, the distance between the reference output end 41 and the target output end 42 corresponds to the acoustic pressure loss, and therefore the corresponding curve relation between the loss and the transmission distance when the acoustic wave is transmitted in the acoustic wave guide tube 4 can be obtained. Thereby improving the accuracy of calculation of the target loss of the acoustic waveguide 4.
In the embodiments described above, although 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 that fall within the broad scope of the appended claims.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An apparatus for measuring acoustic waveguide loss, comprising:
the sound wave module is used for generating a sound wave signal;
an acoustic waveguide comprising an input, a reference output, and a target output, the input of the acoustic waveguide being connected to the acoustic module, the acoustic waveguide being configured to propagate the acoustic signal; the reference output end is distant from the target output end;
the operation module is connected with the reference output end of the sound wave guide pipe and the target output end of the sound wave guide pipe and used for calculating and obtaining sound pressure loss according to the sound wave signal output by the reference output end and the sound wave signal output by the target output end;
and the output module is connected with the operation module and used for correspondingly outputting the first preset value and the sound pressure loss so as to obtain the corresponding relation between the distance and the sound pressure loss.
2. An apparatus for measuring the loss of an acoustic waveguide as recited in claim 1, further comprising a transformation module, wherein said reference output of said acoustic waveguide and said target output of said acoustic waveguide are connected to said operational module through said transformation module;
the conversion module is used for converting the sound wave signal output by the reference output end into a reference electric signal and converting the sound wave signal output by the target output end into a target electric signal;
and the operation module calculates to obtain 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 computing 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 subtraction unit is connected with the conversion unit and is used for carrying out difference calculation 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 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;
the impedance matcher is connected with the power amplifier and is used for providing impedance matching;
the ultrasonic transducer is connected with the impedance matcher; for generating the acoustic wave signal based on the impedance matched and amplified pulse signal.
5. An apparatus for measuring loss of an acoustic waveguide as claimed in claim 4, further comprising a solid-liquid coupler, an input end of the solid-liquid coupler facing the ultrasonic transducer, an output end of the solid-liquid coupler being connected to the acoustic waveguide, the solid-liquid coupler being configured to transmit the acoustic signal into the acoustic waveguide.
6. An apparatus for measuring acoustic waveguide loss according to claim 5 wherein the acoustic waveguide is secured within a media container by a mounting base, a fluid medium being disposed within the media container, the acoustic waveguide being immersed within the fluid medium within the media container; the fluid medium within the acoustic waveguide is for conducting the acoustic signal.
7. The apparatus according to claim 6, wherein the ultrasonic transducer is fixedly disposed on a sidewall 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 to the input end of the acoustic waveguide.
8. An apparatus for measuring acoustic waveguide loss as claimed in claim 1, wherein the separation distance between adjacent said target outputs is fixed.
9. A method of measuring acoustic waveguide loss, comprising the steps of:
acquiring an acoustic wave signal, and sending the acoustic wave signal to an acoustic wave guide pipe for conduction;
acquiring a reference sound wave signal from a reference output end preset on the sound wave guide pipe, and acquiring a target sound wave signal from a target output end preset on the sound wave guide pipe; converting the reference sound wave signal into a reference electric signal and converting the target sound wave signal into a target electric signal;
converting the reference electric signal into a reference sound pressure value, converting the target electric signal into a target sound pressure value, and calculating the difference between the reference sound pressure value and the target sound pressure value to obtain sound pressure loss;
and acquiring the distance between the reference output end and the target output end so as to acquire the corresponding relation between the distance and the sound pressure loss.
10. A method for measuring acoustic waveguide loss according to claim 9, wherein said reference acoustic pressure value is transformed by the equation:
wherein P is0Is the reference sound pressure value, A0Is the amplitude of said reference electrical signal, MLA load sensitivity for a cable used to transmit the reference electrical signal and the target electrical signal;
the conversion formula of the target sound pressure value is as follows:
wherein P is1Is the target sound pressure value, A1Is the amplitude of the target electrical signal.
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