CN115598217B - Device and method for in-situ measurement of low-frequency acoustic characteristics of seabed sediment layer - Google Patents
Device and method for in-situ measurement of low-frequency acoustic characteristics of seabed sediment layer Download PDFInfo
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- 239000013049 sediment Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012625 in-situ measurement Methods 0.000 title claims abstract description 12
- 239000000523 sample Substances 0.000 claims abstract description 107
- 238000011065 in-situ storage Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000000149 penetrating effect Effects 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 3
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- 238000005070 sampling Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
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- 239000013505 freshwater Substances 0.000 description 1
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- 239000002344 surface layer Substances 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a device and a method for in-situ measurement of low-frequency acoustic characteristics of a seabed sediment layer, wherein the device comprises a deck subsystem and an underwater detection subsystem, the deck subsystem comprises a hydraulic unit and a display control unit, and the underwater detection subsystem comprises an acoustic transmitting unit and an acoustic receiving unit; the acoustic transmitting unit comprises a transmitting transducer and a transmitting circuit module; the acoustic receiving unit comprises a conical probe, a first acoustic probe, a receiving circuit probe and a second acoustic probe. The deck subsystem and the underwater detection subsystem are powered and communicated through a four-core cable, and real-time state display and remote control of the deck subsystem on the underwater detection subsystem are achieved. The acoustic receiving unit is based on a hydraulic unit, and can penetrate into a hard deposition layer to obtain the acoustic characteristics of the deposition layer with a large depth profile. The method is suitable for the in-situ measurement of the large-depth low-frequency acoustic characteristics of the seabed sediment layer, can accurately obtain the sound velocity and the sound attenuation coefficient of the sediment layer in situ, and is used for ocean sound field calculation and seabed engineering geological exploration.
Description
Technical Field
The invention belongs to the technical field of measuring the acoustic characteristics of seabed sediment layers, and particularly relates to a device and a method for measuring the low-frequency acoustic characteristics of the seabed sediment layers in situ.
Background
The acoustic characteristics are important environmental factors of oceans and are widely applied to oceanographic science and oceanographic engineering. The acoustic characteristics of the seabed surface sedimentary stratum are used as the lower boundary of sound wave propagation in the ocean, and the acoustic characteristics of the ocean water body jointly constrain the sound wave propagation in the ocean, so that the method is one of the key parameters of ocean sound field calculation. Meanwhile, the seabed sediment layer is also a direct object for ocean engineering construction, the acoustic characteristics of the seabed sediment layer are closely related to elasticity, and the seabed sediment layer is an important content for carrying out ocean engineering geological evaluation. There are two methods for measuring the acoustic properties of seafloor sediments: one is sampling measurement and the other is in-situ measurement. Sampling measurement is a measurement performed in a laboratory after a sample of a sediment layer is collected from the seabed, and the measurement mode has two problems: on the one hand, the sample collection and handling process causes the disturbance of the sediment, changing its original physical state, and on the other hand, the original temperature and pressure environment of the seabed is separated, changing its original environmental conditions. The physical state and environmental conditions of sediments have important influence on acoustic characteristics, and based on the important influence, in-situ measurement technology is actively developed internationally and domestically, and a measuring instrument is inserted into the submarine sediments for in-situ measurement.
At present, the acoustic characteristic in-situ measurement of a seabed sedimentary deposit is mainly performed on a surface layer, the self weight of equipment is utilized to penetrate into the sedimentary deposit, the penetration depth is usually less than 10 meters, and the measurement technology can meet the calculation requirement of an ocean sound field. However, the ocean engineering construction needs to measure the acoustic characteristics of the seabed sediment layer with a larger depth, the geological exploration requirement of the seabed engineering construction cannot be met by utilizing the self-weight penetration mode of the equipment, the acoustic characteristic measurement of the seabed sediment layer with a large depth is difficult to carry out, and meanwhile, the low-frequency measurement operation is not suitable to carry out.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the low-frequency acoustic characteristics of a seabed sedimentary layer in situ, aiming at the defects of the prior art.
The invention is realized by the following technical scheme: a low-frequency acoustic characteristic in-situ measuring device for a seabed sediment layer comprises a deck subsystem and an underwater detection subsystem; the deck subsystem comprises a hydraulic unit and a display control unit; the underwater detection subsystem comprises an acoustic transmitting unit and an acoustic receiving unit; the acoustic emission unit comprises a hemispherical directional low-frequency emission transducer and a hemispherical directional high-frequency emission transducer; the acoustic receiving unit comprises a second acoustic probe rod, a receiving circuit probe rod, a first acoustic probe rod and a conical probe which are sequentially connected from top to bottom to form a probe rod;
a first receiving transducer and a second receiving transducer are embedded and installed in the first acoustic probe; a third receiving transducer and a fourth receiving transducer are embedded and mounted in the second acoustic probe rod;
the first acoustic probe rod is provided with a first 4-hole sound-transmitting window and a second 4-hole sound-transmitting window, the second acoustic probe rod is provided with a third 4-hole sound-transmitting window and a fourth 4-hole sound-transmitting window, all the sound-transmitting windows are radially inwards sunk by 1mm, a first receiving transducer, a second receiving transducer, a third receiving transducer and a fourth receiving transducer are respectively and correspondingly installed and embedded in the first 4-hole sound-transmitting window, the second 4-hole sound-transmitting window, the third 4-hole sound-transmitting window and the fourth 4-hole sound-transmitting window, a plurality of sound attenuation grooves are formed in the outer wall of the probe rod, the first acoustic probe rod and the receiving circuit probe rod as well as the receiving circuit probe rod and the second acoustic probe rod are communicated and powered through 4-core socket cables, each 4-core socket cable consists of a first plug, an electric slip ring and a second plug, two cores are powered, and two cores are communicated;
the hemispherical directional high-frequency transmitting transducer is used for transmitting sound waves to measure the distance between the hemispherical directional high-frequency transmitting transducer and each receiving transducer, the hemispherical directional low-frequency transmitting transducer is used for transmitting sound waves, and the acoustic characteristics are further measured through the receiving of the acoustic receiving unit;
the hydraulic unit is used for penetrating the acoustic receiving unit into the seabed sedimentary deposit through hydraulic pressure; the display control unit is used for controlling the transmitting parameters of the transmitting transducer on the acoustic transmitting unit and receiving the data collected by the receiving transducer on the acoustic receiving unit.
Furthermore, the display control unit is used for controlling the acoustic emission unit and acquiring data of the acoustic receiving unit, and controlling emission and data acquisition based on the clock synchronization signal.
Furthermore, the acoustic emission unit further comprises an underwater sound velocity meter for measuring the sound velocity in water.
Further, the cone-shaped probe, which has a diameter 2mm larger than the diameters of the first and second acoustic probes, reams a hole while penetrating the sedimentary layer of the seabed.
Furthermore, the distance between the first acoustic probe and the distance between the 2 receiving transducers respectively arranged on the second acoustic probe are the same; the polarization direction of the first acoustic probe is opposite to that of the 4 adjacent receiving transducers mounted on the second acoustic probe.
Furthermore, an attitude sensor is arranged in the receiving circuit probe rod, and the attitude of the probe rod in the seabed sediment layer is monitored in real time.
Further, the first acoustic probe is provided with a displacement sensor, and the depth of the integral probe penetrating into the sediment is obtained.
The invention also provides an in-situ measurement method for the low-frequency acoustic characteristics of the seabed sediment layer, which comprises the following steps:
(1) During operation, arranging the acoustic transmitting unit, and after the acoustic transmitting unit sits on the bottom, penetrating the acoustic receiving unit into the seabed sedimentary layer through the hydraulic unit;
(2) In the process of penetrating into the seabed sediment layer, performing underwater measurement; the method comprises the following steps that an acoustic receiving unit penetrates into a settled layer, and the acoustic characteristic of the settled layer is measured by using the same transmitting frequency as that in water;
(3) And collecting sound wave data in the settled layer and the water body through the acoustic receiving unit, transmitting the sound wave data to the display control unit, and performing post-processing on the data to obtain in-situ acoustic characteristic parameters of the submarine sediments.
The invention has the beneficial effects that: the hydraulic pressure based on deck subsystem penetrates the unit, utilizes the probe rod device of design, can penetrate the seabed sedimentary deposit of great degree of depth, carries out acoustic characteristic normal position and measures, through the design of the acoustics window of probe rod, can ensure to receive the sound wave of great degree of depth sedimentary deposit to effectively protect receiving transducer in the atress of great degree of depth sedimentary deposit, keep receiving transducer's receiving sensitivity. The invention utilizes the separately arranged transmitting transducer, can adopt a large-sized low-frequency acoustic transducer, and integrates the high-frequency transducer and the underwater sound velocity meter to complete the measurement of the relative distance between the transmitting transducer and the receiving transducer; the invention realizes the deep in-situ low-frequency measurement of the large acoustic characteristic of the seabed sedimentary deposit and provides an effective means for the elastic mechanics evaluation of the seabed sedimentary deposit in the field of ocean engineering.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the general structure of the present invention.
Fig. 2 is a schematic diagram of an acoustic transmitting unit of the present invention.
Fig. 3 is a schematic diagram of an acoustic receiving unit of the present invention.
Fig. 4 is a schematic view of a connection scheme between the acoustic probe and the receiving circuit probe according to the present invention.
FIG. 5 is a schematic calculation diagram of the measurement method of the present invention.
In the figure, a hydraulic unit 1.1, a display and control unit 1.2, an acoustic emission unit 2.1, an acoustic receiving unit 2.2, a hemispherical directional low-frequency emission transducer 2.1.1, a hemispherical directional high-frequency emission transducer 2.1.2, an underwater sound velocity meter 2.1.3, a cone-shaped probe 2.2.1, a first acoustic probe 2.2.2, a receiving circuit probe 2.2.3, a second acoustic probe 2.2.4, a first receiving transducer 2.2.2.1, a second receiving transducer 2.2.2.2, a third receiving transducer 2.2.4.1, a fourth receiving transducer 2.2.4.2, a first 4-hole sound-transmitting window 2.2.3, a second 4-hole sound-transmitting window 2.2.4, a third 4-hole sound-transmitting window 2.2.4.3 and a fourth 4-hole sound-transmitting window 2.2.2.4.4.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1-3, the in-situ measuring device for low frequency acoustic characteristics of seabed sediment layer of the present invention comprises a deck subsystem and an underwater detection subsystem; the deck subsystem comprises a hydraulic unit 1.1 and a display control unit 1.2; the underwater detection subsystem comprises an acoustic emission unit 2.1 and an acoustic receiving unit 2.2; the transmitting unit comprises a hemispherical directional low-frequency transmitting transducer 2.1.1 and a hemispherical directional high-frequency transmitting transducer 2.1.2 with the frequency of 100 kHz-200 kHz, the frequency of the hemispherical directional low-frequency transmitting transducer 2.1.1 is 1 kHz-8 kHz, and the frequency of the hemispherical directional high-frequency transmitting transducer 2.1.2 is 100 kHz-200 kHz; the acoustic receiving unit comprises a conical probe 2.2.1, a first acoustic probe 2.2.2, a receiving circuit probe 2.2.3 and a second acoustic probe 2.2.4; the first acoustic probe 2.2.2 is provided with a first receiving transducer 2.2.2.1 and a second receiving transducer 2.2.2.2; the second acoustic probe 2.2.4 is provided with a third receiving transducer 2.2.4.1 and a fourth receiving transducer 2.2.4.2; the receiving circuit probe 2.2.3 is located between the first acoustic probe 2.2.2 and the second acoustic probe 2.2.4, and the cone-shaped probe 2.2.1, the first acoustic probe 2.2.2, the receiving circuit probe 2.2.3 and the second acoustic probe 2.2.4 are connected into one acoustic probe through threads.
The hemispherical directional high-frequency transmitting transducer 2.1.2 is used for transmitting sound wave measurement and the distance between each receiving transducer, the hemispherical directional low-frequency transmitting transducer 2.1.1 is used for transmitting sound wave, and the acoustic characteristics are further measured by receiving through the acoustic receiving unit 2.2;
the hydraulic unit 1.1 is used for penetrating the acoustic receiving unit 2.2 into the seabed sedimentary deposit through hydraulic pressure; the display control unit 1.2 is used for controlling the transmitting parameters of the transmitting transducer on the acoustic transmitting unit 2.1, receiving the data collected by the receiving transducer on the acoustic receiving unit 2.2, and controlling the transmitting and data collecting work based on the clock synchronization signal.
As shown in fig. 2, the acoustic transmitter unit 2.1 includes an underwater sound velocity meter 2.1.3 for measuring the speed of sound in water.
The conical probe 2.2.1, which has a diameter 2mm larger than the diameter of the first 2.2.2 and second 2.2.4 acoustic probes, is reamed while penetrating a sedimentary layer of the seabed.
As shown in fig. 3, the first acoustic probe 2.2.2 is provided with a first 4-hole sound-transmitting window 2.2.3 and a second 4-hole sound-transmitting window 2.2.2.4, the second acoustic probe 2.2.4 is provided with a third 4-hole sound-transmitting window 2.2.4.3 and a fourth 4-hole sound-transmitting window 2.2.4.4, all the sound-transmitting windows are recessed by 1mm, the first receiving transducer 2.2.2.1, the second receiving transducer 2.2.2, the third receiving transducer 2.2.4.1 and the fourth receiving transducer 2.2.2.4.2 are respectively and correspondingly installed and embedded inside the first 4-hole sound-transmitting window 2.2.2.3, the second 4-hole sound-transmitting window 2.2.2.4.4, the third 4-hole sound-transmitting window 2.2.4.3 and the fourth 4-hole sound-transmitting window 2.2.2.4.4, and the outer wall of the first acoustic probe is provided with a plurality of sound attenuation grooves.
As shown in fig. 4, the first acoustic probe 2.2.2, the receiving circuit probe 2.2.3 and the second acoustic probe 2.2.4 communicate and supply power through a 4-core socket cable, the 4-core socket cable is composed of a first plug 2.2.2.5, an electrical slip ring 2.2.6 and a second plug 2.2.2.7, and the probes are connected through threads.
The first acoustic probe 2.2.2 and the second acoustic probe 2.2.4 are respectively provided with 2 receiving transducers with the same distance; the polarization direction of the first acoustic probe 2.2.2 is opposite to that of the 4 adjacent receiving transducers mounted on the second acoustic probe 2.2.4.
And an attitude sensor is arranged in the receiving circuit probe rod 2.2.3, so that the attitude of the probe rod in the seabed sediment layer can be monitored in real time.
The first acoustic probe 2.2.2 is provided with a displacement sensor, so that the depth of the probe penetrating into the sediment can be obtained.
After an investigation ship is installed and debugged, the acoustic transmitting unit 2.1 is arranged to enter the sea, the underwater sound velocity meter 2.1.3 measures the sound velocity of sea water, then the acoustic receiving unit 2.2 probe rod is arranged based on the hydraulic unit 1.1, the hemispherical directional high-frequency transmitting transducer 2.1.2 transmits sound waves in water after the first receiving transducer 2.2.2.1, the second receiving transducer 2.2.2, the third receiving transducer 2.2.4.1 and the fourth receiving transducer 2.2.4.2 in the probe rod enter the water, and the distances between the hemispherical directional high-frequency transmitting transducer 2.1.2 and the first receiving transducer 2.2.1, the second receiving transducer 2.2.2.2, the third receiving transducer 2.2.4.2 and the fourth receiving transducer 2.2.2 are calculated and obtained by utilizing the propagation time of the sound waves received by the four receiving transducers and based on the sound velocity measured by the underwater sound velocity meter 2.1.3. After the probe rod touches the bottom, the uniform velocity starts to penetrate into the seabed sedimentary deposit, the hemispherical directional low-frequency transmitting transducer 2.1.1 transmits sound waves, the sound wave propagation time and the sound wave amplitude received by the four receiving transducers are utilized, and the distance between the hemispherical directional low-frequency transmitting transducer 2.1.1 and the four receiving transducers is converted based on the horizontal projection distance and the penetration depth of the hemispherical directional low-frequency transmitting transducer 2.1.1 and the four receiving transducers, so that the sound velocity and the sound attenuation coefficient of the seabed sedimentary deposit at different layers are calculated.
As shown in FIG. 5, the distance between the transmitting transducer and the 4 receiving transducers of the acoustic probe at a certain time is
、
、
And & ->
The sound propagation time between the transmitting transducer and the receiving transducer is ≥ respectively>
、
、
And
wherein the sound velocity in the water is measured by a sound velocity meter>
.4 receiving transducers are each situated at a distance ≥ from one another>
、
And
the horizontal projection distance between the transmitting transducer and the probe rod is L, and the correction value of the receiving transducer relative to the horizontal projection point of the transmitting transducer is ^ 5>
。
Based on the above formulas (1), (2), (3), (4) and (5), the distance between the transmitting transducer and the receiving transducer at a certain time is obtained
、 
、 
And & ->
Using transmitting transducers andand receiving the propagation time of the transducer in the sediment layer on the seabed, and solving the sound velocity and the sound attenuation coefficient of the sediment layer.
On the other hand, the invention also provides a method for realizing the low-frequency acoustic characteristic in-situ measurement of the seabed sedimentary deposit by using the device, wherein during operation, the acoustic transmitting unit 2.1 is arranged, and after the acoustic transmitting unit sits on the bottom, the acoustic receiving unit 2.2 is penetrated into the seabed sedimentary deposit through the hydraulic unit 1.1; in the process of penetrating into the seabed sedimentary deposit, beginning to carry out underwater measurement; when the acoustic receiving unit 2.2 is penetrated into the sediment layer, the acoustic characteristics of the sediment layer are measured by using the same transmitting parameters as those in the water; acoustic data in the sediment layer and the water body are collected through the acoustic receiving unit 2.2 and transmitted to the display control unit 1.2, and post-processing of the data is carried out to obtain in-situ acoustic characteristic parameters of the submarine sediments.
The method comprises the following concrete steps:
step 1: system installation
1.1 Checking to confirm that the unit components are normal;
1.2 A deck subsystem and an underwater detection subsystem are assembled, respectively.
Step 2: system debugging
2.1 A 4-core socket cable is used for connecting the display control unit 1.2 with the acoustic transmitting unit 2.1 and the acoustic receiving unit 2.2 of the underwater detection subsystem;
2.2 Power supply and communication debugging are performed according to specific operation requirements.
And step 3: system laying
3.1 Using a winch to hoist the acoustic emission unit 2.1, laying down the cloth into water;
3.2 Acoustic emission unit 2.1, stopping laying;
3.3 An acoustic receiving unit 2.2 is arranged by using a hydraulic unit 1.1, when a conical probe 2.2.1, a first acoustic probe 2.2.2, a receiving circuit probe 2.2.3 and a second acoustic probe 2.2.4 are all immersed in water, a hemispherical directional high-frequency transmitting transducer 2.1.2 of the acoustic transmitting unit 2.1 transmits sound waves, four receiving transducers record the sound wave propagation time, and an underwater sound velocity meter 2.1.3 measures the sound velocity of seawater;
3.4 Utilizing the hydraulic unit 1.1 to continuously penetrate the conical probe 2.2.1, the first acoustic probe 2.2.2, the receiving circuit probe 2.2.3 and the second acoustic probe 2.2.4 into the seabed sediment layer, the hemispherical directional low-frequency transmitting transducer 2.1.1 of the acoustic transmitting unit 2.1 transmits sound waves, and the four receiving transducers record the sound wave propagation time;
3.5 When the probe rod reaches a predetermined depth of the seabed sediment layer or meets a hard stratum, the penetration is stopped and the probe rod is recovered.
And 4, step 4: system recovery
4.1 ) recovering the underwater detection subsystem to the deck after the operation is finished;
4.2 Detaching the underwater detection subsystem, washing with fresh water, and storing to a cool and dry place.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (7)
1. An in-situ measuring device for low-frequency acoustic characteristics of a seabed sediment layer is characterized by comprising a deck subsystem and an underwater detection subsystem; the deck subsystem comprises a hydraulic unit (1.1) and a display control unit (1.2); the underwater detection subsystem comprises an acoustic transmitting unit (2.1) and an acoustic receiving unit (2.2); the acoustic emission unit (2.1) comprises a hemispherical directional low-frequency emission transducer (2.1.1) and a hemispherical directional high-frequency emission transducer (2.1.2); the acoustic receiving unit (2.2) comprises a conical probe (2.2.1), a first acoustic probe (2.2.2), a receiving circuit probe (2.2.3) and a second acoustic probe (2.2.4), which are sequentially connected from bottom to top into a probe rod;
the first acoustic probe rod (2.2.2) is internally embedded with a first receiving transducer (2.2.2.1) and a second receiving transducer (2.2.2.2); a third receiving transducer (2.2.4.1) and a fourth receiving transducer (2.2.4.2) are embedded and installed in the second acoustic probe (2.2.4);
the first acoustic probe rod (2.2.2) is provided with a first 4-hole sound-transmitting window (2.2.2.3) and a second 4-hole sound-transmitting window (2.2.2.4), the second acoustic probe rod (2.2.4) is provided with a third 4-hole sound-transmitting window (2.2.4.3) and a fourth 4-hole sound-transmitting window (2.2.4.4), all the sound-transmitting windows are radially recessed by 1mm, and a first receiving transducer (2.2.2.1), a second receiving transducer (2.2.2.2), a third receiving transducer (2.2.4.1) and a fourth receiving transducer (2.2.4.2) are correspondingly embedded in the first 4-hole sound-transmitting window (2.2.3), the second 4-hole sound-transmitting window (2.2.2.4), the third 4-hole sound-transmitting window (2.2.4.3) and the fourth receiving transducer (2.2.4.4.2) are respectively and internally provided with a plurality of sound-transmitting grooves;
the first acoustic probe rod (2.2.2) and the receiving circuit probe rod (2.2.3) and the second acoustic probe rod (2.2.4) are communicated and powered through a 4-core socket cable, the 4-core socket cable consists of a first plug (2.2.2.5), an electric slip ring (2.2.2.6) and a second plug (2.2.2.7), and the two-core power supply and the two-core communication are realized;
the hemispherical directional low-frequency transmitting transducer (2.1.1) is used for transmitting sound waves and measuring sound wave signals of a sedimentary deposit, the acoustic characteristics are further measured by receiving through the acoustic receiving unit (2.2), the hemispherical directional high-frequency transmitting transducer (2.1.2) is used for transmitting the sound waves and measuring the distance between the receiving transducers, and the acoustic propagation signals in the water body are received through the acoustic receiving unit (2.2);
the acoustic emission unit (2.1) further comprises an underwater sound velocity meter (2.1.3) for measuring the sound velocity in water;
the hydraulic unit (1.1) is used for penetrating the acoustic receiving unit (2.2) into the seabed sedimentary deposit through hydraulic pressure;
the display and control unit (1.2) is used for controlling the transmitting parameters of the transmitting transducer on the acoustic transmitting unit (2.1) and receiving the data collected by the receiving transducer on the acoustic receiving unit (2.2).
2. The in-situ measuring device for the low-frequency acoustic characteristics of the seabed sediment layer as claimed in claim 1, wherein the display and control unit (1.2) is used for controlling the acoustic emission unit (2.1) and acquiring data of the acoustic receiving unit (2.2), and the emission and data acquisition work is controlled based on a clock synchronization signal.
3. An in situ device for measuring the low frequency acoustic properties of sediment at the seabed as claimed in claim 1, wherein the cone shaped probe (2.2.1) has a diameter 2mm larger than the diameter of the first acoustic probe (2.2.2) and the second acoustic probe (2.2.4) and is reamed when penetrating the sediment at the seabed.
4. The in-situ measuring device for the low frequency acoustic characteristics of the seabed sediment as claimed in claim 1, wherein the distance between the 2 receiving transducers respectively arranged on the first acoustic probe (2.2.2) and the second acoustic probe (2.2.4) is the same; the polarization direction of the first acoustic probe (2.2.2) is opposite to that of 4 adjacent receiving transducers arranged on the second acoustic probe (2.2.4).
5. The in-situ measurement device for the low-frequency acoustic characteristics of the seabed sediment as claimed in claim 1, wherein the receiving circuit probe rod (2.2.3) is internally provided with an attitude sensor for monitoring the attitude of the probe rod in the seabed sediment in real time.
6. An in situ measurement device of low frequency acoustic properties of sedimentary layers on the seabed as claimed in claim 1, wherein the first acoustic probe (2.2.2) is provided with a displacement sensor to obtain the depth of the whole probe penetrating into the sediment.
7. An in-situ measuring method for the acoustic properties of a seabed sediment layer based on the in-situ measuring device for the low-frequency acoustic properties of the seabed sediment layer as claimed in any one of claims 1 to 6, which comprises the following steps:
(1) During operation, arranging the acoustic transmitting unit (2.1), and after the acoustic transmitting unit sits on the bottom, penetrating the acoustic receiving unit (2.2) into a seabed sedimentary layer through the hydraulic unit (1.1);
(2) In the process of penetrating into the seabed sedimentary deposit, beginning to carry out underwater measurement; when the acoustic receiving unit (2.2) penetrates into the sedimentary deposit, the acoustic characteristics of the sedimentary deposit are measured by using the same transmitting frequency as that in water;
(3) Acoustic data in the sedimentary deposit and the water body are collected through the acoustic receiving unit (2.2) and transmitted to the display control unit (1.2), and post-processing of the data is carried out to obtain in-situ acoustic characteristic parameters of the submarine sediments.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211594471.0A CN115598217B (en) | 2022-12-13 | 2022-12-13 | Device and method for in-situ measurement of low-frequency acoustic characteristics of seabed sediment layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211594471.0A CN115598217B (en) | 2022-12-13 | 2022-12-13 | Device and method for in-situ measurement of low-frequency acoustic characteristics of seabed sediment layer |
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