CN107655563A - A kind of test device and method of sonic transducer low frequency sensitivity - Google Patents
A kind of test device and method of sonic transducer low frequency sensitivity Download PDFInfo
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- CN107655563A CN107655563A CN201710665586.7A CN201710665586A CN107655563A CN 107655563 A CN107655563 A CN 107655563A CN 201710665586 A CN201710665586 A CN 201710665586A CN 107655563 A CN107655563 A CN 107655563A
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- 230000035945 sensitivity Effects 0.000 title claims abstract description 56
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000033001 locomotion Effects 0.000 claims abstract description 47
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 239000013535 sea water Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000002609 medium Substances 0.000 abstract description 31
- 238000005259 measurement Methods 0.000 abstract description 6
- 239000012736 aqueous medium Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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Abstract
The invention provides a kind of test device and method of sonic transducer low frequency sensitivity, the device includes：Container, the container is interior to set dividing plate so that container is divided into first compartment and second compartment, and the side wall of first compartment sets first through hole, and the side wall of second compartment sets the second through hole；Fluid media (medium) is held in first compartment, aqueous medium is held in second compartment；First through hole is tightly connected sound-producing device, the sealing of the second through hole, and sets standard hydrophone towards the side of first through hole in the second through hole；Or first through hole sealing, the second through hole is tightly connected sound-producing device, and sets sonic transducer to be measured towards the side of the second through hole in first through hole.The present invention meets the water environment and media environment and stimulus movement sounding of reciprocity sound field conditions by constructing, and after handling the parameter of acquisition, is capable of the sensitivity of sonic transducer of the accurate measurement condition of work in the fluid media (medium)s such as transformer oil.
Description
Technical Field
The invention relates to the field of acoustic measurement, in particular to a device and a method for testing low-frequency sensitivity of an acoustic sensor.
Background
Transformers can be divided into oil-immersed transformers and dry-type transformers. In order to strengthen the insulation and cooling conditions in the oil-immersed transformer, an iron core and a winding of the transformer are immersed into an oil tank filled with transformer oil. In order to detect the body noise of an oil-filled transformer, an acoustic sensor resistant to transformer oil has been developed.
In order to detect the sensitivity of transformer oil resistant acoustic sensors, the same comparison or reciprocity test methods as hydrophone calibration are commonly used in the prior art. The comparison method is to compare a standard hydrophone with known sensitivity with a hydrophone to be detected to obtain the sensitivity of the hydrophone to be detected; the reciprocity test is an accurate method of calibrating a receiving transducer (a standard microphone or a standard hydrophone) using the principle of electro-acoustic reciprocity, which is defined as a standard method by the International Electrotechnical Commission (IEC). The principle of electro-acoustic reciprocity refers to a linear, passive, reversible electro-acoustic transducer (reciprocal transducer) in which the ratio of the receiving sensitivity when used as a receiver to the transmission response when used as a transmitter is a constant, referred to as the reciprocity constant.
Therefore, the prior art has at least the following technical drawbacks: if a comparison method is adopted, a standard hydrophone with known sensitivity is needed, and the sensitivity of the standard hydrophone is actually the sensitivity in water; when the standard hydrophone is placed in transformer oil, the sensitivity of the standard hydrophone can be changed to a certain extent due to the fact that the impedance of water is different from that of the transformer oil, so that the measurement is inaccurate, and meanwhile, the packaging material of the standard hydrophone can be corroded by the transformer oil to cause damage to the standard hydrophone; if a reciprocity testing method is adopted, a reciprocity transducer resistant to transformer oil corrosion needs to be developed, and the method is difficult to realize.
Disclosure of Invention
Aiming at the complaint defect in the prior art, the invention provides a device and a method for testing the low-frequency sensitivity of an acoustic sensor.
One aspect of the present invention provides a device for testing low-frequency sensitivity of an acoustic sensor, including: the container is divided into a first compartment and a second compartment by a partition board, a first through hole is formed in the side wall of the first compartment, and a second through hole is formed in the side wall of the second compartment; the first compartment contains fluid medium, and the second compartment contains water medium; the first through hole is hermetically connected with a sound generating device, the second through hole is hermetically connected, and a standard hydrophone is arranged on one side, facing the first through hole, of the second through hole; or, the first through hole is sealed, the second through hole is hermetically connected with the sound generating device, and the first through hole faces to one side of the second through hole and is provided with a sound sensor to be detected.
The sound production device comprises a vibration exciter, an ejector rod, an accelerometer and a flat piston, wherein the vibration exciter is sequentially connected with the ejector rod, the accelerometer and the flat piston, and the flat piston is hermetically connected with the first through hole or the second through hole.
Wherein the first through hole and the second through hole are oppositely arranged.
Wherein the fluid medium comprises transformer oil, seawater, kerosene or alcohol.
The container is a hard-wall container, the flat piston is a circular hard flat piston, the standard hydrophone is a B & K8104 type hydrophone, and the partition plate is a stainless steel partition plate.
Another aspect of the present invention provides a method for testing low-frequency sensitivity of an acoustic sensor according to the above apparatus, including: s1, exciting the sound production device to produce sound at a first movement speed, and acquiring sound pressure of the standard hydrophone; s2, exciting the sound generating device to generate sound at a second movement speed and acquiring the voltage of the sound sensor to be detected; and S3, acquiring the sensitivity of the to-be-detected sound sensor according to the first movement speed, the sound pressure, the second movement speed and the voltage.
Wherein the step S1 further includes: exciting the flat piston to move to sound through the vibration exciter, and acquiring a first movement speed of the flat piston and the sound pressure of the standard hydrophone; the step S2 further includes: and exciting the flat piston to move to sound through the vibration exciter, and acquiring the second movement speed of the flat piston and the voltage of the acoustic sensor to be detected.
Wherein the step S3 further includes: the sensitivity of the acoustic sensor under test is obtained by,
wherein f is the frequency, V1(f) For the first movement speed, P (f) is the sound pressure, V2(f) For the second movement speed, E (f) is the voltage, and M (f) is the sensitivity of the acoustic sensor to be measured.
Wherein, before the step S1, the method further includes: sealing the second through hole, and arranging a standard hydrophone on one side of the second through hole, which faces the first through hole; before the step S2, the method further includes: and sealing the first through hole, and arranging an acoustic sensor to be tested on one side of the first through hole, which faces the second through hole.
Wherein the first and second movement velocities are obtained by the accelerometer.
According to the device and the method for testing the low-frequency sensitivity of the acoustic sensor, provided by the invention, the water environment and the medium environment meeting the condition of a reciprocal sound field are constructed, and the motion is stimulated to sound, so that the sensitivity of the acoustic sensor under the working condition in fluid media such as transformer oil can be accurately measured after the acquired parameters are processed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first state of a testing apparatus for low-frequency sensitivity of an acoustic sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second state of the testing apparatus for low-frequency sensitivity of an acoustic sensor according to the embodiment of the present invention;
fig. 3 is a schematic flow chart of a method for testing low-frequency sensitivity of an acoustic sensor according to an embodiment of the present invention;
in the figure, 1: a container; 2: a partition plate; 3: a plate piston; 4: a plate piston; 5: a standard hydrophone; 6: a sensor to be tested; 7: a vibration exciter; 8: a top rod; 9: an accelerometer; 10: and (4) a fixing device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The device for testing the low-frequency sensitivity of the acoustic sensor provided by the embodiment of the invention is used for measuring the sensitivity of the acoustic sensor used in a fluid medium environment, and the embodiment of the invention is described below by taking the measurement of the sensitivity of the acoustic sensor used for measuring the noise of the oil-immersed transformer body as an example, but the scope of the embodiment of the invention is not limited thereto.
Fig. 1 is a schematic structural diagram of a first state of a testing apparatus for low-frequency sensitivity of an acoustic sensor according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a second state of the testing apparatus for low-frequency sensitivity of an acoustic sensor according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the apparatus includes: the container comprises a container 1, wherein a partition plate 2 is arranged in the container 1 to divide the container 1 into a first compartment and a second compartment, a first through hole is formed in the side wall of the first compartment, and a second through hole is formed in the side wall of the second compartment; the first compartment contains fluid medium, and the second compartment contains water medium; the first through hole is hermetically connected with a sound generating device, the second through hole is hermetically connected, and a standard hydrophone 5 is arranged on one side, facing the first through hole, of the second through hole; or, the first through hole is sealed, the second through hole is hermetically connected with the sound generating device, and the first through hole faces to one side of the second through hole and is provided with the acoustic sensor 6 to be detected.
The fluid medium is a medium corresponding to the use environment of the acoustic sensor to be detected, namely an ideal working environment of the acoustic sensor to be detected; the acoustic sensor to be tested is arranged in the fluid medium for testing the sensitivity, and an accurate sensitivity result can be obtained.
The water medium is a medium corresponding to the use environment of the standard hydrophone, namely the ideal working environment of the standard hydrophone, and in addition, the temperature of the water medium should be kept at the working temperature of the standard hydrophone during the test.
Specifically, the container 1 may be one of various shapes such as a circle or a square; the container 1 may be divided into two parts by a partition 2, forming two compartments. One of the compartments can be filled with a fluid medium and is configured as a fluid medium environment; the other compartment may be filled with water and configured as an aqueous environment. A through hole can be respectively arranged at the opening holes on the side walls of the two compartments, namely a first through hole can be arranged on the side wall of the first compartment; a second through hole is provided in a side wall of the second compartment.
Under first state, first through-hole is sealed, and is connected with sound generating mechanism for sound generating mechanism horizontal movement sound production, and the one side towards first through-hole of the second through-hole in the second compartment sets up standard hydrophone 5, measures the acoustic pressure value.
Under the second state, the second through-hole is sealed, and is connected with sound generating mechanism for sound generating mechanism horizontal movement sound production, and the one side towards the second through-hole of the first through-hole in first compartment sets up the acoustic sensor 6 that awaits measuring, output voltage value.
According to the device for testing the low-frequency sensitivity of the acoustic sensor, provided by the embodiment of the invention, the water environment and the medium environment meeting the reciprocal sound field condition are constructed, and the motion is stimulated to sound, so that the sensitivity of the acoustic sensor under the working condition in the fluid medium such as transformer oil can be accurately measured after the acquired parameters are processed.
On the basis of the above embodiment, the sound production device includes vibration exciter 7, ejector pin 8, accelerometer 9 and dull and stereotyped piston, vibration exciter 7 in proper order with ejector pin 8 accelerometer 9 with dull and stereotyped piston connection, dull and stereotyped piston with first through-hole or second through-hole sealing connection.
Among them, a vibration exciter (vibration exciter) is a device attached to some machines and equipments for generating an exciting force, and is an important part using mechanical vibration. The vibration exciter can make the excited object obtain a certain form and magnitude of vibration quantity, so as to make vibration and strength test for object or make calibration for vibration testing instrument and sensor.
As shown in fig. 1, in a first state, a vibration exciter 7, a mandril 8 and an accelerometer 9 are connected with a flat piston 3 in sequence, the vibration exciter 7 excites the flat piston 3 to sound at a certain moving speed, and the accelerometer 9 can measure a first moving speed of the flat piston 3; the second through hole is sealed, and the sealing mode shown in fig. 2 can be adopted specifically, namely, the flat piston 4 is connected with the second through hole in a sealing mode, and the flat piston 4 is also connected with the fixing device 10, so that the purpose of sealing is achieved; a standard hydrophone 5 can also be placed 1cm in front of the second through hole.
As shown in fig. 2, in a second state, the vibration exciter 7, the ejector rod 8 and the accelerometer 9 are sequentially connected with the flat piston 4, the vibration exciter 7 excites the flat piston 4 to sound at a certain moving speed, and the accelerometer 9 can measure a second moving speed of the flat piston 4; the first through hole is sealed, and the sealing mode shown in fig. 3 can be adopted, namely, the flat piston 3 is connected with the first through hole in a sealing mode, and the flat piston 3 is also connected with the fixing device 10, so that the sealing purpose is achieved; the acoustic sensor 6 to be measured can also be arranged at the position 1cm in front of the first through hole.
On the basis of the above embodiment, the first through hole and the second through hole are oppositely arranged. Specifically, the two through holes are arranged oppositely, so that the output values of the acoustic sensor 6 to be detected and the standard hydrophone 5 are larger, and the detection result of the sensitivity is more accurate.
On the basis of the above embodiment, the fluid medium includes transformer oil, seawater, kerosene or alcohol, and the fluid medium may also be water. The testing device provided by the embodiment of the invention can be used for testing the sensitivity of the acoustic sensor applied to various media, and has a wide application scene.
On the basis of the above embodiment, the container 1 is a hard-wall container, the flat piston is a circular hard flat piston, the standard hydrophone 5 is a B & K8104 type hydrophone, and the partition plate 2 is a stainless steel partition plate.
The piston is a component capable of reciprocating and can be excited by a vibration exciter to move and sound; the plate piston 3 and the plate piston 4 may be circular hard plate pistons.
Fig. 3 is a schematic flow chart of a method for testing low-frequency sensitivity of an acoustic sensor according to an embodiment of the present invention, as shown in fig. 3, including: s1, exciting the sound production device to produce sound at a first movement speed, and acquiring sound pressure of the standard hydrophone; s2, exciting the sound generating device to generate sound at a second movement speed and acquiring the voltage of the sound sensor to be detected; and S3, acquiring the sensitivity of the to-be-detected sound sensor according to the first movement speed, the sound pressure, the second movement speed and the voltage.
In step S1, a test in a first state is performed, and the sound-generating device is excited to generate sound in the fluid medium at a first movement speed, and the sound pressure measured by the standard hydrophone in the fluid medium is obtained.
In step S2, a test in a second state is performed, and the sound generating device is excited in the aqueous medium at a second movement speed to generate movement sound, and the voltage output by the acoustic sensor to be tested in the fluid medium is acquired.
It should be noted that, the above steps S1 and S2 are interchangeable in time sequence, and the step of acquiring the sound pressure of the standard hydrophone by only exciting the sound-generating device to generate sound in the fluid medium according to the embodiment of the present invention is described in advance, and the scope of the embodiment of the present invention is not limited thereto.
In step S3, the sensitivity of the sensor to be measured can be obtained through calculation according to the first movement speed obtained in step S1 and step S2 and the sound pressure and the second movement speed obtained through measurement by the standard hydrophone and the voltage output by the sensor to be measured.
According to the method for testing the low-frequency sensitivity of the acoustic sensor, provided by the embodiment of the invention, the water environment and the medium environment meeting the reciprocal sound field condition are constructed, and the motion is stimulated to sound, so that the sensitivity of the acoustic sensor under the working condition in the fluid medium such as transformer oil can be accurately measured after the acquired parameters are processed.
On the basis of the above embodiment, the step S1 further includes: exciting the flat piston to move to sound through the vibration exciter, and acquiring a first movement speed of the flat piston and the sound pressure of the standard hydrophone; the step S2 further includes: and exciting the flat piston to move to sound through the vibration exciter, and acquiring the second movement speed of the flat piston and the voltage of the acoustic sensor to be detected.
Specifically, in step S1, in the first state, the vibration exciter excites the plate piston to move horizontally in the fluid medium to generate sound, and at the same time, the movement speed of the plate piston is measured, i.e. the first movement speed; meanwhile, the standard hydrophone is influenced by the horizontal movement sound production, and the sound pressure measured by the standard hydrophone is measured.
Specifically, in step S2, in the second state, the reciprocity property condition is satisfied with the first state; exciting the flat piston to horizontally move in the water medium by a vibration exciter to produce sound, and measuring the movement speed of the flat piston at the same time, wherein the movement speed is the second movement speed; and simultaneously acquiring the voltage output by the acoustic sensor to be detected.
On the basis of the above embodiment, the step S3 further includes: the sensitivity of the acoustic sensor under test is obtained by,
wherein f is the frequency, V1(f) For the first movement speed, P (f) is the sound pressure, V2(f) For the second movement speed, E (f) is the voltage, and M (f) is the sensitivity of the acoustic sensor to be measured.
On the basis of the above embodiment, the step S1 is preceded by: sealing the second through hole, and arranging a standard hydrophone on one side of the second through hole, which faces the first through hole; before the step S2, the method further includes: and sealing the first through hole, and arranging an acoustic sensor to be tested on one side of the first through hole, which faces the second through hole.
Specifically, before the test in the first state of step S1, the second through hole needs to be sealed, for example, a flat piston is connected to the second through hole in a sealing manner, and the flat piston is further connected to a fixing device, so as to achieve the purpose of sealing; a standard hydrophone was also placed 1cm in front of the second through hole.
Specifically, before the test in the second state of step S2, the first through hole needs to be sealed, for example, a flat piston is connected to the first through hole in a sealing manner, and the flat piston is further connected to a fixing device, so as to achieve the purpose of sealing; and the acoustic sensor to be measured is arranged at the position 1cm in front of the first through hole.
On the basis of the above embodiment, the first movement velocity and the second movement velocity are acquired by an accelerometer.
In order to illustrate the device and method for testing the low-frequency sensitivity of the acoustic sensor provided by the above embodiments of the present invention, the following examples are given.
The sensitivity of the transformer oil resistant acoustic sensor is tested by adopting the testing device and the method provided by the embodiment. And the ambient temperature is kept at the working temperature of the standard hydrophone, and the sensitivity test based on the acoustic-acoustic reciprocity principle is carried out. The test is mainly divided into 3 steps:
step 1: as shown in fig. 1, the test in the first state is performed; the second plate piston 4 is fixed by a fixing device 10, a standard hydrophone 5 is arranged 1cm in front of the second plate piston, the first plate piston 3 is excited to horizontally move and produce sound by a vibration exciter 7 through a mandril 8, an accelerometer 9 is connected between the mandril 8 and the first plate piston 3 in series to measure the movement speed of the first plate piston 3, and meanwhile, the sound pressure is measured through the standard hydrophone 5(B & K8104 type hydrophone).
Step 2: as shown in fig. 2, the test in the second state is performed; the first flat plate piston 3 is fixed through a fixing device 10, a sensor 6 to be measured is arranged 1cm right in front of the first flat plate piston 3, a vibration exciter 7 is used for exciting the second flat plate piston 4 to horizontally move to produce sound through a mandril 8, an accelerometer 9 is connected between the mandril 8 and the second flat plate piston 4 in series to measure the movement speed of the second flat plate piston 4, and meanwhile the output voltage of the sensor 6 to be measured is measured.
And step 3: and obtaining a calculation formula (1) of the sensitivity of the acoustic sensor 6 to be detected through the acoustic reciprocity principle, and obtaining the sensitivity of the acoustic sensor 6 to be detected.
According to the device and the method for testing the low-frequency sensitivity of the acoustic sensor, provided by the embodiment of the invention, aiming at the sensitivity measurement problem of a special acoustic sensor for a special medium, a water environment and a medium environment are constructed to be respectively provided with a standard hydrophone and an acoustic sensor to be tested, so that the standard hydrophone is ensured to be in an ideal working environment; meanwhile, the flat piston is used as a point sound source, a calculation formula of the sensitivity of the acoustic sensor to be detected is obtained according to the acoustic reciprocity principle, and the sensitivity of the acoustic sensor to be detected is further accurately obtained.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A device for testing the low frequency sensitivity of an acoustic sensor, comprising:
the container is divided into a first compartment and a second compartment by a partition board, a first through hole is formed in the side wall of the first compartment, and a second through hole is formed in the side wall of the second compartment; the first compartment contains fluid medium, and the second compartment contains water medium;
the first through hole is hermetically connected with a sound generating device, the second through hole is hermetically connected, and a standard hydrophone is arranged on one side, facing the first through hole, of the second through hole; or,
the first through hole is sealed, the second through hole is hermetically connected with the sound generating device, and the first through hole faces towards one side of the second through hole and is provided with an acoustic sensor to be detected.
2. The apparatus of claim 1, wherein:
the sound production device comprises a vibration exciter, an ejector rod, an accelerometer and a flat piston, wherein the vibration exciter is sequentially connected with the ejector rod, the accelerometer and the flat piston, and the flat piston is hermetically connected with the first through hole or the second through hole.
3. The apparatus of claim 1, wherein the first and second through-holes are oppositely disposed.
4. The apparatus of claim 1, wherein the fluid medium comprises transformer oil, seawater, kerosene, or alcohol.
5. The apparatus of claim 2, wherein the vessel is a hard-walled vessel, the plate piston is a circular hard plate piston, the standard hydrophone is a B & K8104 hydrophone, and the septum is a stainless steel septum.
6. A method for testing the low frequency sensitivity of an acoustic sensor according to the apparatus of claim 2, comprising:
s1, exciting the sound production device to produce sound at a first movement speed, and acquiring sound pressure of the standard hydrophone;
s2, exciting the sound generating device to generate sound at a second movement speed and acquiring the voltage of the sound sensor to be detected;
and S3, acquiring the sensitivity of the to-be-detected sound sensor according to the first movement speed, the sound pressure, the second movement speed and the voltage.
7. The method of claim 6,
the step S1 further includes:
exciting the flat piston to move to sound through the vibration exciter, and acquiring a first movement speed of the flat piston and the sound pressure of the standard hydrophone;
the step S2 further includes:
and exciting the flat piston to move to sound through the vibration exciter, and acquiring the second movement speed of the flat piston and the voltage of the acoustic sensor to be detected.
8. The method according to claim 6, wherein the step S3 further comprises:
the sensitivity of the acoustic sensor under test is obtained by,
<mrow> <mi>M</mi> <mrow> <mo>(</mo> <mi>f</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mrow> <msub> <mi>V</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>f</mi> <mo>)</mo> </mrow> <mi>E</mi> <mrow> <mo>(</mo> <mi>f</mi> <mo>)</mo> </mrow> </mrow> <mrow> <msub> <mi>V</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>f</mi> <mo>)</mo> </mrow> <mi>P</mi> <mrow> <mo>(</mo> <mi>f</mi> <mo>)</mo> </mrow> </mrow> </mfrac> </mrow>
wherein f is the frequency, V1(f) For the first movement speed, P (f) is the sound pressure, V2(f) For said second movement speed, E (f) isVoltage, M (f) is the sensitivity of the acoustic sensor to be measured.
9. The method of claim 7,
before the step S1, the method further includes:
sealing the second through hole, and arranging a standard hydrophone on one side of the second through hole, which faces the first through hole;
before the step S2, the method further includes:
and sealing the first through hole, and arranging an acoustic sensor to be tested on one side of the first through hole, which faces the second through hole.
10. The method of claim 7, wherein the first and second velocities of motion are obtained by the accelerometer.
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| CN112285796A (en) * | 2020-10-10 | 2021-01-29 | 国网湖南省电力有限公司 | Oil-immersed reactor noise prediction method based on reciprocity principle |
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