LU500301B1 - Pressure-controlled device for measuring a target strength of an underwater acoustic scatterer and measuring method using the same - Google Patents
Pressure-controlled device for measuring a target strength of an underwater acoustic scatterer and measuring method using the same Download PDFInfo
- Publication number
- LU500301B1 LU500301B1 LU500301A LU500301A LU500301B1 LU 500301 B1 LU500301 B1 LU 500301B1 LU 500301 A LU500301 A LU 500301A LU 500301 A LU500301 A LU 500301A LU 500301 B1 LU500301 B1 LU 500301B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- sound
- transducer
- sound wave
- pressure
- signal
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H5/00—Measuring propagation velocity of ultrasonic, sonic or infrasonic waves, e.g. of pressure waves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Farming Of Fish And Shellfish (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present disclosure provides a pressure-controlled device for measuring a target strength of an underwater acoustic scatterer and a measuring method using the same. The pressure-controlled device includes a sound-speed measuring device, a data processor and a density measuring device. The sound-speed measuring device includes a sound-speed measuring container, a pressure pump, a first transducer, a second transducer, a signal generator and a signal collector. The pressure pump, the first transducer and the second transducer are connected to the sound-speed measuring container. The signal generator is connected to the first transducer, and the signal collector is connected to the second transducer and the data processor. The pressure-controlled device is simple and portable, and has wider applicability. Meanwhile, the device can simulate an actual underwater pressure to obtain a more accurate target strength and improve the accuracy of the resource estimation.
Description
TECHNICAL FIELD This application relates to acoustic techniques for researches of marine living resources, and more particularly to a pressure-controlled device for measuring a target strength of an underwater acoustic scatterer and a measuring method using the same.
BACKGROUND Acoustic technology has been widely used in the survey of marine living resources, and the target strength has a significant impact on the species identification and resource assessment in acoustic surveys. Some small aquatic organisms, such as zooplankton, have complex shapes and small sizes, so that it is impractical to directly measure their target strength. In view of this, it is required to obtain the comparison data between the target scatterer and the water medium in terms of the sound speed and density to indirectly calculate the target strength of those aquatic organisms. Therefore, the sound speed in the target scatterer needs to be measured. The existing sound speed measuring device can only measure the sound speed in biological tissues under the normal atmospheric pressure, and cannot simulate the actual pressure environment underwater, and thus the measured value deviates from the actual underwater value, failing to acquire an accurate target strength.
The existing sound-speed measuring device is usually placed in a pressure vessel, and mainly includes a pressure vessel and an acoustic chamber (the core component). In a direction perpendicular to an axis of an animal chamber, two thin rubber sheets are provided to confine aquatic organisms in the animal chamber. A top and a bottom of the animal chamber are respectively provided with a sealable threaded hole for accommodating an animal. Both sides of the acoustic chamber are provided with a transducer. All wires are waterproof, and are used for external connection through a connector arranged on the pressure vessel. A hole on a wall of the acoustic chamber is configured to release air bubbles that may be generated during the placement of the acoustic chamber in the experiment equipment or the pressure vessel. Air enters and exits through an intake valve and a vent valve, changing a pressure in the device. A sound speed contrast of the measured acoustic scatterer to the water medium is calculated through a series of algorithms. A target strength value is obtained through combining the sound speed contrast and the density contrast obtained by a density measuring device.
Unfortunately, the existing devices struggle with the following defects.
1. The pressure device and the sound-speed measuring device are independently arranged, leading to cumbersome structure, complicated operation and poor portability.
2. The animal chamber has a relatively small capacity, and can only accommodate a limited number of organisms. Moreover, it is not suitable for the large organisms such as Antarctic krill.
3. The rubber sheets on both sides of the animal chamber will affect the propagation speed of sound, causing a deviation in the final result.
4. The observation window is too small to observe the situation in the chamber well.
5. An additional pressure vessel is required, increasing the production cost.
SUMMARY Aiming at the above-mentioned shortcomings in the prior art, the present disclosure provides a pressure-controlled device for measuring a target strength of an underwater acoustic scatterer and a measuring method using the same. The device is simple and portable, and has wider applicability. Meanwhile, the device can simulate an actual underwater pressure to obtain a more accurate target strength and improve the accuracy of resource assessment.
In a first aspect, the present disclosure provides a pressure-controlled device for measuring a target strength of an underwater acoustic scatterer, which comprises: a sound-speed measuring device; a data processor; and a density measuring device; wherein the sound-speed measuring device comprises a sound-speed measuring container, a pressure pump, a first transducer, a second transducer, a signal generator and a signal collector, the pressure pump, the first transducer and the second transducer are connected to the sound-speed measuring container; the signal generator is connected to the first transducer; and the signal collector is connected to the second transducer and the data processor.
In some embodiments, the sound-speed measuring container is made of transparent acrylic material; an inverted T-shaped pipe is arranged in the sound-speed measuring container, the inverted T-shaped pipe comprises a horizontal pipe and a vertical pipe; a bottom of the vertical pipe is communicated with a middle of a top surface of the horizontal pipe; the vertical pipe is provided with a scale line along a vertical direction; a top of the vertical pipe is connected to a sample inlet of the sound-speed measuring container; the sample inlet is openable and is configured to communicate with the pressure pump; and two ends of the horizontal pipe are connected to the first transducer and second transducer, respectively.
In some embodiments, a rubber ring is arranged between the sample inlet and the sound-speed measuring container; the sample inlet is connected to a rubber pipe through a stainless-steel connecting piece; and the pressure pump is communicated with the vertical pipe through the rubber pipe.
In some embodiments, the sample inlet is made of stainless steel.
In some embodiments, a stainless-steel base is connected to a bottom of the sound-speed measuring container.
In some embodiments, a diameter of the inverted T-shaped pipe is 3.5 cm.
In a second aspect, the present disclosure further provides a method for measuring a target strength of an underwater acoustic scatterer using the above-mentioned pressure-controlled device, which comprises:
S1: pouring the sea water into the inverted T-shaped pipe through the sample inlet until a liquid level of the sea water reaches to mark 0 of the scale line;
S2: under different pressures, generating a first sound wave by the signal generator; transmitting, by the first transducer, the first sound wave to the second transducer; receiving, by the second transducer, the first sound wave; collecting, by the signal collector, a signal of the first sound wave through the second transducer; sending, by the signal collector, the signal of the first sound wave to the data processor; and obtaining, by the data processor, a propagation time t, of the first sound wave when a target organism to be measured is not in the sea water according to the signal of the first sound wave through pulse waveform matching or pulse peak detection;
S3: adding the target organism to be measured is into the inverted T-shaped pipe through the sample inlet; and recording a scale after the liquid level rises to obtain a volume of the target organism to be measured;
S4: changing a pressure in the inverted T-shaped pipe by the pressure pump to simulate a pressure at a required water depth in an ocean;
SS: generating, a second sound wave by the signal generator; transmitting, by the first transducer, the second sound wave to the second transducer; receiving, by the second transducer, the second sound wave; collecting, by the signal collector, a signal of the second sound wave through the second transducer; sending, by the signal collector, the signal of the second sound wave to the data processor; and obtaining, by the data processor, a propagation time t,, of the second sound wave when the target organism to be measured is in the sea water according to the signal of the second sound wave through the pulse waveform matching or the pulse peak detection;
S6: calculating, by the data processor, a sound speed contrast according to the signal of the first sound wave and the signal of the second sound wave and the volume of the target organism to be measured;
S7: obtaining, by the density measuring device, a density contrast; and sending, by the density measuring device, the density contrast to the data processor; and S8: substituting, by the data processor, the sound speed contrast and the density contrast into a target strength theoretical model to obtain a target strength value of the target organism to be measured.
In some embodiments, in step (S6), the data processor calculates the sound speed contrast according to formula (1) shown as follows: hip, Ÿ rns (D; wherein hy, 1s the sound speed contrast; t, is the propagation time of second sound wave when the target organism is in the sea water; tg, is the propagation time of the first sound wave when the target organism to be measured is not in the sea water; and & is a volume fraction calculated according a formula shown as follows: o=* (2); wherein V, is the volume of the target organism to be measured; and ¥,, is a total volume of the sea water and the target organism to be measured.
The beneficial effects of the present disclosure are described as follows.
A pressure-controlled device for measuring a target strength of an underwater acoustic scatterer provided herein combines a pressure device and a sound-speed measuring device into one device, and has simple operation, high portability and low cost. The inverted T-shaped pipe is a cylindrical pipe with a diameter of 3.5 cm, which can accommodate more animals or larger animals such as Antarctic krill. No other equipment is provided between two transducers, reducing the influence on the propagation of sound speed and the deviation of final result. Transparent acrylic allows a directly observation of animals and water in the horizontal pipeline. The biological posture can be recorded by a camera, providing a reference for studying the relationship between the target strength and the inclination angle and cross-section of the biological body.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically depicts a structure of a pressure-controlled device for measuring a target strength of an underwater acoustic scatterer in accordance with an embodiment of the present disclosure.
DETAILED DESCRIPTION OF EMBODIMENTS The technical solutions of this disclosure will be further described below with reference to the accompanying drawing and embodiment.
As shown in FIG. 1, the present disclosure provides a pressure-controlled device for measuring a target strength of an underwater acoustic scatterer, which includes a sound-speed measuring device 1, a data processor 2 and a density measuring device 3. The sound-speed measuring device 1 includes a sound-speed measuring container 11, a pressure pump 12, a first transducer 13, a second transducer 14, a signal generator and a signal collector 16. The pressure pump 12, the first transducer 13 and the second transducer 14 are connected to the sound-speed measuring container 11. The signal generator 15 is connected to the first transducer 13, and the signal collector 16 is connected to the second transducer 14 and the data processor 2.
In this embodiment, the sound-speed measuring container 11 is made of transparent acrylic, and an inverted T-shaped pipe 111 is arranged in the sound-speed measuring container 11. The inverted T-shaped pipe 111 includes a horizontal pipe and a vertical pipe. A bottom of the vertical pipe is communicated with a middle of a top surface of the horizontal pipe. The vertical pipe is provided with a scale line 112 along a vertical direction. A top of the vertical pipe is connected to a sample inlet 113 of the sound-speed measuring container 11. The sample inlet 113 is openable and is configured to communicate with the pressure pump 12. Two ends of the horizontal pipe are connected to the first transducer 13 and second transducer 14, respectively. The first transducer 13 and the second transducer 14 are respectively connected to the signal generator 15 or the signal collector 16 through a waterproof cable. The transparent acrylic is configured visually see an animal in the pipes.
À rubber ring is arranged between the sample inlet 113 and the sound-speed measuring container 11. The sample inlet 113 1s connected to a rubber pipe through a stainless-steel connecting piece. The pressure pump 12 is communicated with the vertical pipe through the rubber pipe.
The sample inlet 113 is made of stainless steel, which is not easily corroded by sea water 4 to extend a service life of the equipment.
A stainless-steel base 114 is connected to a bottom of the sound-speed measuring container 11, and is configured for fixing the sound-speed measuring container 11.
A diameter of the inverted T-shaped pipe 111 is 3.5 cm.
The present disclosure further provides a method for measuring a target strength using the pressure-controlled device for measuring a target strength of an underwater acoustic scatterer provided herein. The steps of the method are described as follows.
S1: The sea water 4 is poured into the inverted T-shaped pipe 111 from through oppening113 until a liquid level of the sea water 4 rises to mark 0 of the scale line
112.
S2: Under different pressures, the signal generator 15 generates a first sound wave, and the first sound wave is transmitted to the second transducer 14 through the first transducer 13. The signal collector 16 collects a signal of the first sound wave of the first sound wave through the second transducer 14, and sends the signal of the first sound wave to the data processor 2. The data processor 2 obtains a propagation time t, of the first sound wave when a target organism 5 to be measured is not in the sea water 4 according to the signal of the first sound wave through pulse waveform matching or pulse peak detection.
S3: The target organism 5 to be measured is added into the inverted T-shaped pipe 111 from through sample inlet 113, and a scale after the liquid level rises is recorded to obtain a volume of the target organism 5 to be measured.
S4: A pressure in the inverted T-shaped pipe 111 is changed by the pressure pump 12 to simulate a pressure at a required water depth in an ocean.
SS: The signal generator 15 generates a second sound wave, and the second sound wave is transmitted to the second transducer 14 through the first transducer 13. The signal collector 16 collects a signal of the second sound wave of the second sound wave through the second transducer 14, and sends the signal of the second sound wave to the data processor 2. The data processor 2 obtains a propagation time tm of the second sound wave when the target organism 5 is in the sea water 4 according to the signal of the second sound wave through the pulse waveform matching or the pulse peak detection.
S6: The data processor 2 calculates a sound speed contrast according to the signal of the first sound wave and the signal of the second sound wave and the volume of the target organism 5 to be measured.
S7: A density contrast is obtained using the density measuring device 3, and is sent to the data processor 2.
S8: The data processor 2 substitutes the sound speed contrast and the density contrast into a target strength theoretical model to obtain a target strength value of the target organism 5 to be measured.
In this embodiment, in step (S6), the data processor 2 calculates the sound speed contrast according to formula (1) shown as follows: hip, Ÿ Tn (D; in the formula, hy, is the sound speed contrast. t,, is the propagation time of the second sound wave when the target organism 5 is in the sea water 4. ty is the propagation time of the first sound wave when the target organism 5 to be measured is not in the sea water 4. © is a volume fraction calculated according a formula shown as follows: © = = (2); in the formula, V, is the volume of the target organism 5 to be measured, and Vy, 1s a total volume of the sea water 4 and the target organism 5 to be measured.
In an embodiment, a transparent acrylic material is used to make the sound-speed measuring container 11. The pressure pump 12 is directly connected to the sound speed measuring container 11. Under the condition that the device 1s sealed and stable, the pressure pump 12 is used to change an internal pressure of the sound speed measuring container 11. A capacity of the sound speed measuring container 11 can be enlarged by increasing a diameter of an acoustic channel, so as to accommodate more animals or larger animals. When in use, a closed piston of the sample inlet 113 is removed, and the sea water 4 and as many target organisms 5 to be measured as possible are poured into the sound speed measuring container 11. A volume scale is marked on an inner wall of the vertical pipe of the inverted T-shaped pipe 111 to obtain a volume of the target organisms 5 to be measured, so as to calculated a sound speed contrast. The closed piston of the sample inlet 113 is plugged back, and connected to the pressure pump 12. The internal pressure of the device is increased by the pressure pump 12 to simulate the environments of different water depth. According to a propagation distance of the sound wave, that is, a distance between the first transducer 13 and the second transducer 14 and a time difference between the transmitting and receiving signals of the transducers, a propagation speed of the sound wave is obtained, such that a sound speed of a mixed liquid of the sea water 4 and the target organisms 5 to be measured is obtained. A sound speed of the sea water 4 is measured in the same way. Then the sound speed contrast is calculated, and a target strength value is obtained by combining the sound speed contrast with the density contrast. Since the acrylic is transparent, a camera can be placed outside the device to record the different forms of animals in the acoustic channel.
A derivation process of the formula (1) is as follows: the sound speed contrast h is calculated as follows: h=Sz 148% 214 An ¢ ¢ GB); in the formula, cz is a sound speed of an organism, and c is a sound speed of water. Ah=h-1<1, Ac5=c,-C. Sound velocities and a volume fraction are calculated as follows:
| _P,1-P Cw GC (4); in the formula, en, 1s a sound speed of the mixture, and cz a sound speed of an organism. A volume fraction ® is defined as a ratio of a volume of the organism to a volume of the mixture (V, = V, + Vz, in the formula, ¥, is a volume of water):
A Va ©. The sound speed contrast of the mixture is defined as hy, = Cm/c, and the equation (4) can be converted into: = > +1-® m 5); in which hy, =1+Ah,,; Ah, <I; hoa = a /® m (6); in the formula, subscript TA is time average.
For a geometric shape in which a total distance between the transmitter and the receiver is L and a thickness of an animal layer is D, a propagation time when there is an animal is t,,=D/c+(L-D)/c. A difference in sound speed can be expressed as a measurable difference in propagation time: © ob (7); in the formula, Ac, —EmÂc, and tp =D/c, which is a propagation time of the sound wave to propagate over the distance D in the absence of animals. The equation (7) is substituted into the equation (6): fra Ar R ®) mp (1; in the formula, hrs is the sound speed contrast. The target strength value of the organism is obtained through substituting the above-obtained sound speed contrast and the density contrast obtained by the density measuring device 3 into various theoretical models of target strength.
Though the present disclosure has been described in detail with reference to the embodiments and the accompanying drawings, various variations can still be made by those skilled in the art. Any variations, modifications and replacements made by those skilled in the art without departing from the spirit of the disclosure should fall within the scope of the disclosure defined by the appended claims.
Claims (8)
1. A pressure-controlled device for measuring a target strength of an underwater acoustic scatterer, comprising: a sound-speed measuring device; a data processor; and a density measuring device; wherein the sound-speed measuring device comprises a sound-speed measuring container, a pressure pump, a first transducer, a second transducer, a signal generator and a signal collector; the pressure pump, the first transducer and the second transducer are connected to the sound-speed measuring container; the signal generator is connected to the first transducer; and the signal collector is connected to the second transducer and the data processor.
2. The pressure-controlled device according to claim 1, characterized in that the sound-speed measuring container is made of transparent acrylic material; an inverted T-shaped pipe is arranged in the sound-speed measuring container; the inverted T-shaped pipe comprises a horizontal pipe and a vertical pipe; a bottom of the vertical pipe is communicated with a middle of a top surface of the horizontal pipe; the vertical pipe is provided with a scale line along a vertical direction; a top of the vertical pipe is connected to a sample inlet of the sound-speed measuring container; the sample inlet is openable and is configured to communicate with the pressure pump; and two ends of the horizontal pipe are connected to the first transducer and second transducer, respectively.
3. The pressure-controlled device according to claim 2, characterized in that a rubber ring is arranged between the sample inlet and the sound-speed measuring container; the sample inlet is connected to a rubber pipe through a stainless steel connecting piece; and the pressure pump is communicated with the vertical pipe through the rubber pipe.
4. The pressure-controlled device according to claim 3, characterized in that the sample inlet is made of stainless steel.
5. The pressure-controlled device according to claim 4, characterized in that a stainless-steel base is connected to a bottom of the sound-speed measuring container.
6. The pressure-controlled device according to claim 5, characterized in that a diameter of the inverted T-shaped pipe is 3.5 cm.
7. A method for measuring a target strength of an underwater acoustic scatterer using the pressure-controlled device according to any one of claims 2-6, comprising: S1: pouring sea water into the inverted T-shaped pipe through the sample inlet until a liquid level of the sea water reaches mark 0 of the scale line; S2: under different pressures, generating a first sound wave by the signal generator; transmitting, by the first transducer, the first sound wave to the second transducer; receiving, by the second transducer, the first sound wave; collecting, by the signal collector, a signal of the first sound wave through the second transducer; sending, by the signal collector, the signal of the first sound wave to the data processor; and obtaining, by the data processor, a propagation time t; of the first sound wave when a target organism to be measured is not in the sea water according to the signal of the first sound wave through pulse waveform matching or pulse peak detection; S3: adding the target organism to be measured is into the inverted T-shaped pipe through the sample inlet; and recording a scale after the liquid level rises to obtain a volume of the target organism to be measured; S4: changing a pressure in the inverted T-shaped pipe by the pressure pump to simulate a pressure at a required water depth in an ocean; SS: generating, a second sound wave by the signal generator; transmitting, by the first transducer, the second sound wave to the second transducer; receiving, by the second transducer, the second sound wave; collecting, by the signal collector, a signal of the second sound wave through the second transducer; sending, by the signal collector, the signal of the second sound wave to the data processor; and obtaining, by the data processor, a propagation time t,, of the second sound wave when the target organism to be measured is in the sea water according to the signal of the second sound wave through the pulse waveform matching or the pulse peak detection; S6: calculating, by the data processor, a sound speed contrast according to the signal of the first sound wave and the signal of the second sound wave and the volume of the target organism to be measured; S7: obtaining, by the density measuring device, a density contrast; and sending, by the density measuring device, the density contrast to the data processor; and S8: substituting, by the data processor, the sound speed contrast and the density contrast into a target strength theoretical model to obtain a target strength value of the target organism to be measured.
8. The method according to claim 7, characterized in that in step, the data processor calculates the sound speed contrast according to formula (1) shown as follows: Bry = os (1); wherein hg is the sound speed contrast; t,, is the propagation time of the second sound wave when the target organism is in the sea water, tp is the propagation time of the first sound wave when the target organism to be measured is not in the sea water; and ® is a volume fraction calculated according a formula shown as follows: © = = 2);
wherein V;, is the volume of the target organism to be measured; and Vy, is a total volume of the sea water and the target organism to be measured.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110370508.0A CN113091877B (en) | 2021-04-07 | 2021-04-07 | Device and method for measuring target strength of pressure-controlled acoustic scatterers in water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU500301B1 true LU500301B1 (en) | 2021-12-20 |
Family
ID=76674471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU500301A LU500301B1 (en) | 2021-04-07 | 2021-06-18 | Pressure-controlled device for measuring a target strength of an underwater acoustic scatterer and measuring method using the same |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN113091877B (en) |
| AU (1) | AU2021103467A4 (en) |
| LU (1) | LU500301B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114384155A (en) * | 2022-01-12 | 2022-04-22 | 重庆医科大学 | Measuring system and method for measuring sound velocity of medium in waveguide |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4974213A (en) * | 1988-12-16 | 1990-11-27 | Siwecki Thomas L | Passive active underwater sound detection apparatus |
| JP3656357B2 (en) * | 1997-03-28 | 2005-06-08 | いすゞ自動車株式会社 | Volume velocity measuring method and apparatus |
| CN2503470Y (en) * | 2001-11-19 | 2002-07-31 | 国家海洋局海洋技术研究所 | Sea water sound velocimeter |
| DE102006013809B3 (en) * | 2006-03-22 | 2007-09-06 | Elster-Instromet Systems Gmbh | Method and device for measuring operating density and / or operating sound velocity in a gaseous medium |
| CN102175301B (en) * | 2011-03-08 | 2013-01-02 | 中国矿业大学(北京) | Device and method for accurately measuring propagation velocity of wave under different stress conditions |
| CN103090959B (en) * | 2013-02-27 | 2015-06-03 | 中国科学院重庆绿色智能技术研究院 | Acoustic velocity measurement method and device of magnetorheological fluid ultrasonic wave |
| CN104614446B (en) * | 2015-01-20 | 2017-05-10 | 中国人民解放军92859部队 | Acoustic velocity measurement method based on marine bottom sediment |
| WO2017050142A1 (en) * | 2015-09-23 | 2017-03-30 | 中国石油大学(华东) | Simulation experiment test system and test method for gas hydrates in porous medium |
| CN105301114B (en) * | 2015-10-20 | 2018-01-12 | 浙江大学 | A kind of acoustic stimulation insertion loss measuring method based on multichannel space-time liftering technology |
| CN106018550B (en) * | 2016-07-01 | 2019-01-22 | 广东工业大学 | Apparatus and method for measuring acoustic properties |
| CN207717216U (en) * | 2018-01-11 | 2018-08-10 | 长沙理工大学 | A kind of long-range measurement experiment device of the velocity of sound |
| CN111912512A (en) * | 2019-05-07 | 2020-11-10 | 中国地质大学（北京） | Sound velocity measuring device |
| CN110231084B (en) * | 2019-06-25 | 2024-05-28 | 中国科学院声学研究所 | Sound velocity measuring device and method for low temperature and low pressure |
| CN110726775A (en) * | 2019-11-14 | 2020-01-24 | 四川省食品药品检验检测院(四川省药品质量研究所、四川省医疗器械检测中心) | Sound velocity and sound attenuation coefficient measuring device and method |
| CN211877221U (en) * | 2020-04-28 | 2020-11-06 | 湖南国天电子科技有限公司 | Device for measuring underwater sound velocity |
| CN111413402B (en) * | 2020-04-29 | 2024-05-24 | 中国科学院声学研究所 | Acoustic attenuation coefficient measuring device and method for low-temperature low-pressure environment |
-
2021
- 2021-04-07 CN CN202110370508.0A patent/CN113091877B/en active Active
- 2021-06-18 AU AU2021103467A patent/AU2021103467A4/en not_active Ceased
- 2021-06-18 LU LU500301A patent/LU500301B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| AU2021103467A4 (en) | 2021-09-09 |
| CN113091877B (en) | 2023-07-14 |
| CN113091877A (en) | 2021-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110146895B (en) | Acoustic velocity profile inversion method based on inverted multi-beam echometer | |
| Thode et al. | Depth-dependent acoustic features of diving sperm whales (Physeter macrocephalus) in the Gulf of Mexico | |
| WO2014029160A1 (en) | Acoustic undersea tide gauge | |
| LU500301B1 (en) | Pressure-controlled device for measuring a target strength of an underwater acoustic scatterer and measuring method using the same | |
| CN108931777A (en) | The measurement method of cold seepage output gas migration flux | |
| CN104407340A (en) | Device and method for calibrating lineup of dragging linear array | |
| CN113156413B (en) | Seabed reference calibration method based on double-pass acoustic path | |
| CN102393196A (en) | Ocean internal wave acoustic detection method | |
| CN110530765B (en) | Parameter inversion method of bubble group size distribution in water based on nonlinear parameter measurement | |
| CN102081170A (en) | Submarine cable secondary positioning method based on integrated positioning of acoustic long baseline and ultrashort baseline | |
| CN107991679A (en) | A kind of monitoring method and monitoring device of planktonic organism vertical migration | |
| CN111780852B (en) | Device and method for measuring deep sea performance of low-frequency transducer in real time | |
| LU500294B1 (en) | Underwater sound velocity measuring apparatus and method for operating same | |
| CN108398690A (en) | A kind of seabed backscatter intensity measurement method | |
| RU2013134267A (en) | VESSEL WALL FILTER FOR ULTRASONIC ANALYSIS OF MITRAL REGURGITATION | |
| CN111982156B (en) | Underwater echo simulation technology-based single-beam depth finder calibration method | |
| CN209589205U (en) | A kind of multi-beam water depth measuring system | |
| CN210775547U (en) | Acoustic wave flow velocity profiler | |
| CN114594481B (en) | An acoustic sea temperature profiler based on multi-frequency backscatter echo measurement | |
| CN215340310U (en) | Underwater vertical array element position measuring system | |
| CN107687892A (en) | A kind of test device and method of sonic transducer low frequency sensitivity | |
| CN114488162A (en) | A Novel Single Beam Echo Sounder and Its Attitude Compensation Method | |
| CN114777696B (en) | Ultrasonic thickness measuring method | |
| CN113030925B (en) | Data acquisition equipment, underwater vertical array element position measurement system and method | |
| RU2764403C1 (en) | Sea water salinity variation meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20211220 |