CN113916348A - Device and method for measuring material transmission loss - Google Patents
Device and method for measuring material transmission loss Download PDFInfo
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- CN113916348A CN113916348A CN202111055958.7A CN202111055958A CN113916348A CN 113916348 A CN113916348 A CN 113916348A CN 202111055958 A CN202111055958 A CN 202111055958A CN 113916348 A CN113916348 A CN 113916348A
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
The embodiment of the application discloses a device and a method for measuring material transmission loss. The device comprises: the device comprises a standing wave tube, a loudspeaker, an optical fiber laser, an optical fiber pressure sensor component and an information processing component; the loudspeaker transmits the received low-frequency white noise to the optical fiber pressure sensor component so as to deform the optical fiber pressure sensor component; the optical fiber laser is used for emitting incident laser to the deformed optical fiber pressure sensor component so as to change the number of interference fringes corresponding to the optical fiber pressure sensor component; the optical fiber pressure sensor assembly is fixed on the surface of the tube wall of the standing wave tube; the optical fiber pressure sensor assembly is used for reflecting incident laser and obtaining an optical signal; the information processing assembly is connected with the optical fiber pressure sensor assembly; the information processing assembly collects optical signals of the optical fiber pressure sensor assembly and processes the optical signals to obtain the transmission loss of the sample to be tested. Through above-mentioned device, improve the accuracy of sound insulation material measurement in the low frequency range.
Description
Technical Field
The application relates to the technical field of material testing, in particular to a device and a method for measuring material transmission loss.
Background
Today, globalization is increasingly deep, large civil aircrafts play an important role in international trade and trade, and with the enhancement of national strength and the continuous deepening of international communication in China, the autonomous research and development of the large civil aircrafts are also on schedule. The high economic and high safety requirements of large civil aircrafts make many relevant aerodynamic problems to be solved urgently, noise is one of the aerodynamic problems which must be paid attention to in the development stage of the large civil aircrafts, and the internal noise of the aircrafts influences the comfortable riding environment of carrying personnel, so that the international recognition degree of the large civil aircrafts is determined. The noise sources of the passenger aircraft cabin usually adopt three methods of sound absorption, sound insulation and sound source control, and after long-term research and design, the aircraft reduces aerodynamic noise, jet flow noise and turbine vibration as much as possible, so that the cabin noise is mainly solved by adopting the sound absorption and sound insulation methods. The middle and high frequency noise in the cabin is easily absorbed through the glass fiber cotton between the skin and the interior trim panel, the low frequency noise is often difficult to remove, and the noise in the aircraft cabin is mainly low frequency noise, so the research on the low frequency noise reduction material is not slow.
The development of the low-frequency noise reduction material cannot be separated from a testing device for evaluating the low-frequency acoustic characteristics of the material, so that standing wave tubes sold on the market at present can carry out relatively accurate sound insulation measurement on the sound insulation material in a high-frequency range according to piezoelectricity, but the sensitivity in a low-frequency range is relatively low, so that the transmission loss of the sound insulation material in the low-frequency range is difficult to accurately evaluate.
Disclosure of Invention
The embodiment of the application provides a device and a method for measuring material transmission loss, which are used for solving the following technical problems: the existing standing wave tube is difficult to accurately evaluate the transmission loss of the sound insulation material in a low frequency range.
The embodiment of the application adopts the following technical scheme:
the embodiment of the application provides a device for measuring the transmission loss of a material, which comprises a standing wave tube, a loudspeaker, a fiber laser, a fiber pressure sensor component and an information processing component; the loudspeaker is used for transmitting the received low-frequency white noise to the optical fiber pressure sensor component so as to enable the optical fiber pressure sensor component to deform in different degrees; the optical fiber laser is connected with the optical fiber pressure sensor assembly through an optical fiber; the optical fiber laser is used for emitting incident laser to the deformed optical fiber pressure sensor component so as to change the number of interference fringes corresponding to the optical fiber pressure sensor component; the optical fiber pressure sensor assembly is fixed on the surface of the tube wall of the standing wave tube; the optical fiber pressure sensor assembly is used for reflecting the incident laser and obtaining an optical signal; the information processing assembly is connected with the optical fiber pressure sensor assembly through an optical fiber; the information processing assembly is used for collecting the optical signal of the optical fiber pressure sensor assembly and processing the optical signal to convert the optical signal into an electric signal so as to obtain the transmission loss of the sample to be measured.
Optionally, the sample to be tested is placed at the butt joint position of the front section of the standing wave tube and the pipe orifice of the middle section along the direction perpendicular to the axis of the standing wave tube, so that the butt joint position of the pipe orifice is sealed by the sample to be tested.
Optionally, the sample to be tested is of a cylindrical structure; and the diameter of the sample to be tested is not less than the inner diameter of the standing wave tube, and the thickness of the sample to be tested is not more than a preset thickness threshold value.
Optionally, the optical fiber pressure sensor assembly includes a plurality of optical fiber pressure sensors, and the plurality of optical fiber pressure sensors are fixed on the wall surface of the standing wave tube at equal intervals.
Optionally, the information processing component includes a photoelectric conversion device and a signal acquisition and data processor; the photoelectric conversion device is connected with the optical fiber pressure sensor assembly through an optical fiber and is used for converting an optical signal sent by the optical fiber pressure sensor assembly into an electric signal and transmitting the electric signal to the signal acquisition and data processor; the input port of the signal acquisition and data processor is connected with the photoelectric conversion device, and the output port of the signal acquisition and data processor is connected with a computer; the signal acquisition and data processor is used for acquiring and processing the received electric signals and transmitting the processed electric signals to the computer for analysis and calculation.
Optionally, the apparatus further comprises a tip impedance; the terminal impedance is fixed at the terminal of the standing wave tube; the terminal impedance is used for testing the transmission loss of the material based on a transmission matrix method, changing the test sound pressure, obtaining a transmission loss matrix when the material has the terminal impedance, and forming an equation set for solving.
Optionally, the apparatus further comprises a power amplifier; one end of the power amplifier is connected with the calculator, and the other end of the power amplifier is connected with the loudspeaker; the power amplifier is used for amplifying the low-frequency white noise emitted by the calculator and transmitting the amplified low-frequency white noise to the loudspeaker.
Optionally, the speaker and the fiber laser are disposed in the same end of the standing wave tube.
The embodiment of the application also provides a method for measuring the transmission loss of the material, which is characterized in that the received low-frequency white noise is transmitted to the optical fiber pressure sensor component through a loudspeaker so as to enable the optical fiber pressure sensor component to deform in different degrees; emitting incident laser to the deformed optical fiber pressure sensor component through an optical fiber laser so as to change the number of interference fringes corresponding to the optical fiber pressure sensor component; wherein the fiber laser is connected with the fiber pressure sensor assembly through an optical fiber; reflecting the incident laser through the optical fiber pressure sensor component fixed on the surface of the standing wave tube to obtain an optical signal; acquiring an optical signal of the optical fiber pressure sensor assembly through an information processing assembly, and processing the optical signal to obtain the transmission loss of a sample to be tested; the information processing assembly is connected with the optical fiber pressure sensor assembly through an optical fiber.
Optionally, the obtaining of the transmission loss of the sample to be tested specifically includes: processing the acquired optical signal through the information processing assembly to obtain first signal data; obtaining second signal data through terminal impedance measurement; and obtaining the transmission loss of the sample to be tested according to the first signal data and the second signal data.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
1. the device of measurement material transmission loss that this application provided transmits low frequency white noise to light pressure sensor subassembly to make optic fibre pressure sensor subassembly take place to deform. And then, emitting laser to the deformed optical fiber pressure sensor assembly, wherein at the moment, the optical fiber pressure sensor assembly changes the optical path difference between the incident light and the reflected light due to the deformation, so that the number of interference fringes is changed. Through the obtained optical signal, the sound transmission loss of the current sound insulation material can be calculated. Because the sensitivity of the optical signal to the low-frequency signal is higher, the detection of the low-frequency signal is more accurate. Therefore, the problem that the sound insulation quantity of the sound insulation material in low frequency is difficult to measure in the prior art is solved.
2. The application provides a measure material transmission loss's device places the sample that awaits measuring in the anterior segment of standing wave pipe and the orificial butt joint position in middle section. On one hand, the pipe orifice at the interface position can be sealed to prevent sound leakage. On the other hand, the optical fiber pressure sensor can be placed towards two sides one by taking the material to be measured as the center, so that the acquired multiple groups of sound insulation quantity data are compared, and the accuracy of sound insulation quantity measurement is improved.
3. According to the device for measuring the material transmission loss, the plurality of optical fiber pressure sensors are fixed on the surface of the tube wall of the standing wave tube at equal intervals, and the complexity of calculating the transmission loss can be reduced. Because the standing wave tube is fixed on the surface of the standing wave tube at equal intervals, the problem of sound transmission distance does not need to be considered in the calculation process, the data volume is small, and the calculation speed is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort. In the drawings:
fig. 1 is a schematic structural diagram of an apparatus for measuring a material transfer loss according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for measuring a material transfer loss according to an embodiment of the present disclosure.
Wherein the content of the first and second substances,
the device comprises a first optical fiber pressure sensor 1, a second optical fiber pressure sensor 2, a third optical fiber pressure sensor 3, a fourth optical fiber pressure sensor 4, a power amplifier 5, a loudspeaker 6, an optical fiber laser 7, a photoelectric conversion device 8, a signal acquisition and data processor 9, a computer 10, a standing wave tube 11, terminal impedance 12 and a sample to be tested 13.
Detailed Description
The embodiment of the application provides a device and a method for measuring material transmission loss.
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments of the present disclosure, shall fall within the scope of protection of the present application.
In addition, in the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "inner", "outer", "axial", "radial", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are only used for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Referring to fig. 1, an embodiment of the present application provides an apparatus for measuring a material transfer loss. The device comprises a standing wave tube 11, a loudspeaker 6, an optical fiber laser 7, an optical fiber pressure sensor component and an information processing component. The loudspeaker 6 is used for transmitting the received low-frequency white noise to the optical fiber pressure sensor assembly so as to enable the optical fiber pressure sensor assembly to deform to different degrees. The optical fiber laser 7 is connected with the optical fiber pressure sensor assembly through an optical fiber, and the optical fiber laser 7 is used for emitting incident laser to the deformed optical fiber pressure sensor assembly so as to change the number of interference fringes corresponding to the optical fiber pressure sensor assembly. And the optical fiber pressure sensor component is fixed on the surface of the tube wall of the standing wave tube 11 and used for reflecting incident laser and obtaining an optical signal.
Further, the sample 13 to be measured in the standing wave tube 11 is acoustically excited by the speaker 6, and the alloy sheet (not shown) built in the optical fiber pressure sensor module is deformed by receiving sound pressure. At this time, the fiber laser 7 emits laser light to the fiber pressure sensor module, and the optical path difference between the incident light and the reflected light is changed by the deformed fiber pressure sensor, thereby causing the number of interference fringes to change.
It should be noted that, because the light waves are propagated in the medium in the form of sine waves, due to the independence and linear superposition of the propagation of the light waves, when two or more same-frequency light waves meet, a phenomenon of light enhancement or light attenuation occurs according to the difference of phases, that is, the number of interference fringes changes.
In addition, the information processing assembly is connected with the optical fiber pressure sensor assembly through an optical fiber. The information processing component is used for collecting optical signals of the optical fiber pressure sensor component and processing the optical signals to obtain the transmission loss of the sample to be tested 13.
Further, the information processing component modulates and demodulates the collected optical signal, demodulates the light wave interfered by the sound pressure in the optical signal from the optical signal, and converts the demodulated optical signal into an electric signal according to the preset relationship between the optical signal and the sound pressure signal.
The sound insulation quantity of the sample to be measured 13 in the low-frequency signal is measured through the change of the optical signal in the embodiment of the application. Because the sensitivity of the optical signal is high, the influence of the external environment is small, and further the transmission loss measurement can be carried out on the sample to be measured 13 in the low-frequency signal. Therefore, the problem that the prior art is difficult to measure the sound insulation quantity of the material under low-frequency signals is solved.
As an embodiment, referring to fig. 1, a test sample 13 to be tested is placed at a butt joint position of a front section of the standing wave tube 11 and a middle section of a tube orifice along a direction perpendicular to an axis of the standing wave tube 11, so as to seal the butt joint position of the tube orifice by a sample to be tested.
Further, the standing wave tube 11 is composed of a front section, a middle section and a rear section. When the sound insulation test is performed on the test sample 13 to be tested, the test sample is firstly installed at the pipe orifice position of the middle section of the standing wave tube 11 and is in butt joint with the front section of the standing wave tube 11. The edge of the sample to be tested 13 is attached to the inner surface of the standing wave tube 11, so that the butt joint position of the gateway of the standing wave tube 11 is sealed, and the leakage of low-frequency white noise is prevented.
In the embodiment of the present application, the total length of the standing wave tube 11 is preferably 4 meters, the inner diameter is 195 millimeters, the outer diameter is 225 millimeters, and the test frequency range is 25Hz to 800 Hz. The tube wall is made of light aluminum alloy material, the wall thickness of the standing wave tube 11 is thick, the inner surface is smooth and seamless, and resonance caused by high-frequency acoustic vibration coupling is avoided.
It should be noted that the structural parameters of standing wave tube 11 are only preferred parameters, and in practical applications, the structural parameters of standing wave tube 11 may be adjusted according to requirements, which is not limited in this embodiment of the present application.
As an embodiment, referring to fig. 1, the sample to be measured 13 has a cylindrical structure. The diameter of the sample to be tested 13 is not less than the inner diameter of the standing wave tube 11, and the thickness of the sample to be tested 13 is not more than a preset thickness threshold value.
Further, the sample 13 to be tested in the embodiment of the present application may be a material with different moduli, different categories, and different composite forms, such as foam, rubber, and metal. In the embodiment of the present application, the edge of the sample to be measured 13 is attached to the inner surface of the standing wave tube 11, so that the cross-sectional shape of the sample to be measured 13 is the same as the cross-sectional shape of the standing wave tube 11.
For example, when the cross-sectional shape of the standing wave tube 11 is circular and the inside diameter of the standing wave tube 11 is 195mm, the structure of the sample to be measured 13 may be a cylinder, and the diameter of the sample to be measured 13 is not less than 195mm and the thickness is not more than 20 mm.
As an embodiment, referring to fig. 1, the optical fiber pressure sensor assembly includes a first optical fiber pressure sensor 1, a second optical fiber pressure sensor 2, a third optical fiber pressure sensor 3, and a fourth optical fiber pressure sensor 4. The plurality of optical fiber pressure sensors are fixed on the surface of the tube wall of the standing wave tube 11 at equal intervals. Meanwhile, the optical fiber pressure sensor can be flush mounted on the surface of the pipe wall by the aid of the mounting clamp of the optical fiber pressure sensor, so that effective sealing is achieved, and sound leakage is prevented.
Further, in the embodiment of the present application, it is preferable that the first optical fiber pressure sensor 1 and the second optical fiber pressure sensor 2 are disposed at the front section of the standing wave tube 11, the sample to be measured 13 is disposed at the middle section, and the third optical fiber pressure sensor 3 and the fourth optical fiber pressure sensor 4 are disposed at the rear section. And all the optical fiber pressure sensors are fixed on the surface of the tube wall of the standing wave tube 11 at equal intervals.
Sufficient optical signal data can be collected through four light pressure sensors in the embodiment of the application to calculate the sound insulation quantity of the sample to be measured 13. Because different distances have different losses in the transmission process of sound, the optical fiber pressure sensors are sequentially placed at equal intervals in a flush mode, the calculation amount of the distance to the sound transmission loss can be simplified, and the sound insulation effect of the to-be-tested sample 13 is obtained. Two optical fiber pressure sensors are respectively arranged at the front section and the rear section of the standing wave tube 11, so that the transmission loss of sound can be obtained more accurately with the least cost. If the number of the optical fiber pressure sensors is increased, not only the cost is increased, but also the data amount is increased, and the calculation complexity is increased.
Further, in the embodiment of the present application, the distance between two adjacent optical fiber pressure sensors is preferably 1 meter, the distance between an optical fiber pressure sensor and the built-in speaker 6 is preferably 0.6 meter, and the distance between an optical fiber pressure sensor and the end impedance 12 is preferably 0.4 meter.
It should be noted that, the number and the placement positions of the optical fiber pressure sensors in the embodiment of the present application are preferred, and in practical applications, the number and the placement positions of the optical fiber pressure sensors may also be changed according to requirements. For example, in order to improve the calculation accuracy of the sound transmission loss, the number of optical fiber pressure sensors to be placed on the wall surface of the standing wave tube 11 may be increased, and the distance between two adjacent optical fiber pressure sensors may be decreased to measure more optical signal data, thereby improving the calculation accuracy of the transmission loss.
As an embodiment, referring to fig. 1, the apparatus for measuring the material transfer loss further includes a power amplifier 5. One end of the power amplifier 5 is connected with the calculator, and the other end is connected with the loudspeaker 6. The power amplifier 5 is used for amplifying the low frequency white noise emitted from the computer 10 and transmitting the amplified low frequency white noise to the speaker 6.
In one embodiment, referring to fig. 1, a speaker 6 and a fiber laser 7 are built in the same end of the standing wave tube 11.
Further, when testing the sound insulation amount of the sample 13 to be tested, the computer 10 emits low-frequency white noise, which is amplified by the power amplifier 5 and then transmitted to the speaker 6. The loudspeaker 6 is arranged at one end of the standing wave tube 11 and transmits low-frequency white noise to a sample 13 to be tested in the standing wave tube 11 and an optical fiber pressure sensor assembly. The optical fiber pressure sensor component can generate deformation after receiving the sound pressure of low-frequency white noise. At this time, the optical fiber laser 7 installed on the same side as the speaker 6 emits incident laser to the optical fiber pressure sensor module, and the optical fiber pressure sensor module that is deformed reflects the incident laser, and due to the deformation, the incident angle and the reflection angle are changed, thereby changing the optical signal.
As an embodiment, referring to fig. 1, the information processing assembly includes a photoelectric conversion device 8 and a signal acquisition and data processor 9. The photoelectric conversion device 8 is connected with the optical fiber pressure sensor assembly through an optical fiber, and the photoelectric conversion device 8 is used for converting an optical signal sent by the optical fiber pressure sensor assembly into an electric signal and transmitting the electric signal to the signal acquisition and data processor 9. An input port of the signal acquisition and data processor 9 is connected with the photoelectric conversion device 8, and an output port of the signal acquisition and data processor 9 is connected with the computer 10. The signal acquisition and data processor 9 is used for acquiring and processing the received electric signals and transmitting the processed electric signals to the computer 10 for analysis and calculation.
Further, after the optical fiber pressure sensor component obtains the optical signal, the optical signal is converted into an electrical signal through the information processing component, and the electrical signal is processed and calculated, so that the sound transmission loss of the current sample to be measured 13 in the low-frequency white noise signal is obtained. The signal acquisition and data processor 9 modulates and demodulates the acquired optical signal, and demodulates the light waves interfered by the sound pressure in the optical signal from the optical signal. And then the demodulated optical signal is converted into an electrical signal through the photoelectric conversion device 8 and the relationship between the preset optical signal and the sound pressure signal. The signal acquisition and data processor 9 transmits the received electric signals to the computer 10, and analyzes and calculates the received data through the calculation software preset by the computer 10, so as to obtain the transmission loss of the material to be measured.
In one embodiment, referring to fig. 1, a terminal impedance 12 is fixed to a terminal of a standing wave tube 11. The terminal impedance is used for changing the test sound pressure when the transmission loss of the material is tested based on the transmission matrix method, obtaining the transmission loss matrix when the material has the terminal impedance, and forming an equation set for solving.
Further, the terminal impedance 12 is used for changing the test sound pressure, and when the terminal impedance 12 is tested, the sound insulation test result of the test sample 13 to be tested is tested.
Further, after removing the terminal impedance 12 of the rear section of the standing wave tube 11, the test is repeated and analyzed and calculated again by the computer 10. And (4) making a transmission matrix for the two test results, and finally obtaining the transmission loss of the sample to be tested 13.
Table 1 is a comparative table of tests performed on a certain test material in examples of the present application.
TABLE 1
As shown in Table 1, the test results of the comparative products and the products of the examples of the present application are significantly deviated from the test results of the products of the examples of the present application in the frequency range of 25Hz to 200Hz, and the test results of the comparative products and the products of the examples of the present application are more consistent with the test results of the products of the examples of the present application in the frequency range of 200 Hz. The comparison of standard data shows that the products of the embodiment of the application can be tested accurately in the range of 25Hz to 800Hz, so that the measurement of the sound insulation quantity is more accurate in the low-frequency range of the embodiment.
The embodiment of the application provides a method for measuring the transmission loss of a material, which comprises the following steps: the received low-frequency white noise is transmitted to the optical fiber pressure sensor component through the loudspeaker 6, so that the optical fiber pressure sensor component is deformed to different degrees. And emitting incident laser to the deformed optical fiber pressure sensor assembly through the optical fiber laser 7 so as to change the number of interference fringes corresponding to the optical fiber pressure sensor assembly. Wherein, the fiber laser 7 is connected with the fiber pressure sensor component through an optical fiber. The incident laser is reflected by the optical fiber pressure sensor component fixed on the surface of the standing wave tube 11, and an optical signal is obtained. And acquiring the optical signal of the optical fiber pressure sensor assembly through the information processing assembly, and processing the optical signal to obtain the transmission loss of the sample 13 to be measured. Wherein, the information processing assembly is connected with the optical fiber pressure sensor assembly through an optical fiber.
Referring to fig. 2, the method for measuring the material transfer loss specifically includes the following steps:
s201, emitting low-frequency white noise through the computer 10, and amplifying the low-frequency white noise through the power amplifier 5.
And S202, transmitting the amplified low-frequency white noise to an optical fiber pressure sensor assembly in the standing wave tube 11 through the loudspeaker 6.
S203, the fiber laser 7 emits incident laser light to the fiber pressure sensor.
Furthermore, the optical fiber pressure sensor assembly comprises a plurality of optical fiber pressure sensors fixed on the tube wall of the standing wave tube 11. The alloy sheet arranged in the optical fiber pressure sensor generates deformation due to sound pressure. At this time, the fiber laser 7 emits incident laser light to the fiber pressure sensor, and the fiber pressure sensor is deformed, so that the angle between the incident light and the reflected light is changed, and at this time, the number of interference fringes is changed.
S204, the information processing assembly collects the optical signals and processes the collected optical signals to obtain electric signals.
And S205, the information processing assembly transmits the obtained electric signal to the computer 10, and the electric signal is processed and calculated through preset software in the computer 10, so that the transmission loss of the sample to be tested 13 is obtained.
Further, the collected optical signals are processed through the information processing assembly, and first signal data are obtained. The second signal data is measured by the tip impedance 12. And obtaining the transmission loss of the sample to be tested 13 according to the first signal data and the second signal data.
Further, the terminal of standing wave tube 11 of the embodiment of the present application is further installed with a terminal impedance 12, and terminal impedance 12 may also receive an acoustic signal emitted by speaker 6. After receiving the acoustic signal, the end impedance 12 is compared with the impedance of the sound source, so as to obtain the transmission loss of the sample 13 to be measured. And removing the terminal impedance 12 at the rear section of the standing wave tube 11, testing again, analyzing and calculating, and making a transmission matrix for the two calculation results by software in the computer 10 to finally obtain the transmission loss of the sample 13 to be tested.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the embodiments of the apparatus, the device, and the nonvolatile computer storage medium, since they are substantially similar to the embodiments of the method, the description is simple, and for the relevant points, reference may be made to the partial description of the embodiments of the method.
The foregoing description of specific embodiments of the present application has been presented. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the embodiments of the present application pertain. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An apparatus for measuring material transfer loss, the apparatus comprising: the device comprises a standing wave tube, a loudspeaker, an optical fiber laser, an optical fiber pressure sensor component and an information processing component;
the loudspeaker is used for transmitting the received low-frequency white noise to the optical fiber pressure sensor component so as to enable the optical fiber pressure sensor component to deform in different degrees;
the optical fiber laser is connected with the optical fiber pressure sensor assembly through an optical fiber; the optical fiber laser is used for emitting incident laser to the deformed optical fiber pressure sensor component so as to change the number of interference fringes corresponding to the optical fiber pressure sensor component;
the optical fiber pressure sensor assembly is fixed on the surface of the tube wall of the standing wave tube; the optical fiber pressure sensor assembly is used for reflecting the incident laser and obtaining an optical signal;
the information processing assembly is connected with the optical fiber pressure sensor assembly through an optical fiber; the information processing assembly is used for collecting optical signals of the optical fiber pressure sensor assembly and processing the optical signals to obtain the transmission loss of the sample to be tested.
2. The device for measuring the material transfer loss according to claim 1, wherein the sample to be measured is placed at a butt joint position of a front section of the standing wave tube and a middle section of the tube orifice along a direction perpendicular to an axis of the standing wave tube, so as to seal the butt joint position of the tube orifice by the sample to be measured.
3. The device for measuring the material transfer loss according to claim 1, wherein the sample to be measured is a cylindrical structure; and is
The diameter of the sample to be tested is not smaller than the inner diameter of the standing wave tube, and the thickness of the sample to be tested is not larger than a preset thickness threshold value.
4. The apparatus according to claim 1, wherein the optical fiber pressure sensor assembly comprises a plurality of optical fiber pressure sensors, and the optical fiber pressure sensors are uniformly fixed on the wall surface of the standing wave tube.
5. The apparatus for measuring material transfer loss according to claim 1, wherein the information processing unit comprises a photoelectric conversion device and a signal acquisition and data processor;
the photoelectric conversion device is connected with the optical fiber pressure sensor assembly through an optical fiber and is used for converting an optical signal sent by the optical fiber pressure sensor assembly into an electric signal and transmitting the electric signal to the signal acquisition and data processor;
the input port of the signal acquisition and data processor is connected with the photoelectric conversion device, and the output port of the signal acquisition and data processor is connected with a computer; the signal acquisition and data processor is used for acquiring and processing the received electric signals and transmitting the processed electric signals to the computer for analysis and calculation.
6. The apparatus for measuring material transfer loss of claim 1, further comprising a tip impedance;
the terminal impedance is fixed at the terminal of the standing wave tube; and the terminal impedance is used for changing the test sound pressure when the transmission loss of the material is tested based on a transmission matrix method, obtaining a transmission loss matrix when the material has the terminal impedance, and forming an equation set for solving.
7. The apparatus of claim 1, further comprising a power amplifier;
one end of the power amplifier is connected with the calculator, and the other end of the power amplifier is connected with the loudspeaker; the power amplifier is used for amplifying the low-frequency white noise emitted by the calculator and transmitting the amplified low-frequency white noise to the loudspeaker.
8. The apparatus of claim 1, wherein the speaker is disposed at the same end of the standing wave tube as the fiber laser.
9. A method of measuring material transfer loss, the method comprising:
transmitting the received low-frequency white noise to an optical fiber pressure sensor component through a loudspeaker so as to enable the optical fiber pressure sensor component to deform in different degrees;
emitting incident laser to the deformed optical fiber pressure sensor component through an optical fiber laser so as to change the number of interference fringes corresponding to the optical fiber pressure sensor component; wherein the fiber laser is connected with the fiber pressure sensor assembly through an optical fiber;
reflecting the incident laser through the optical fiber pressure sensor component fixed on the surface of the standing wave tube to obtain an optical signal;
acquiring an optical signal of the optical fiber pressure sensor assembly through an information processing assembly, and processing the optical signal to obtain the transmission loss of the sample to be measured through calculation; the information processing assembly is connected with the optical fiber pressure sensor assembly through an optical fiber.
10. The method for measuring the material transfer loss according to claim 9, wherein the obtaining the transfer loss of the sample to be measured specifically comprises:
processing the acquired optical signal through the information processing assembly to obtain first signal data; obtaining second signal data through terminal impedance measurement;
and obtaining the transmission loss of the sample to be tested according to the first signal data and the second signal data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055958.7A CN113916348B (en) | 2021-09-09 | 2021-09-09 | Device and method for measuring material transmission loss |
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