CN115752702A - Low-noise vector hydrophone - Google Patents
Low-noise vector hydrophone Download PDFInfo
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- CN115752702A CN115752702A CN202211507139.6A CN202211507139A CN115752702A CN 115752702 A CN115752702 A CN 115752702A CN 202211507139 A CN202211507139 A CN 202211507139A CN 115752702 A CN115752702 A CN 115752702A
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Abstract
The invention relates to a low-noise vector hydrophone which comprises a vector hydrophone, wherein the vector hydrophone has the specific structure as follows: the piezoelectric accelerometer comprises a piezoelectric accelerometer, a sound pressure sensor, a preamplifier circuit and an aluminum alloy shell, wherein an annular limiting rib is fixed at the position below the inner wall surface of the aluminum alloy shell, a piezoelectric accelerometer is installed on the inner wall surface of the aluminum alloy shell above the annular limiting rib through epoxy resin adhesive, and a piezoelectric wafer is bonded at the bottom of the inner side of the aluminum alloy shell to directly form the sound pressure sensor; the top surface of the piezoelectric accelerometer is fixedly provided with a preamplification circuit through four copper columns, can be used for measuring marine environmental noise and detecting marine underwater targets, and has important application value in the aspects of marine environmental monitoring, marine biological resource survey, underwater warning of port channel and coast and the like.
Description
Technical Field
The invention relates to the technical field of hydrophones, in particular to a low-noise vector hydrophone.
Background
The noise of the marine environment has unique characteristics, the noise sources are various, and the sound production mechanism is different, and comprises wind borne noise, industrial noise, ship noise, sea wave noise, rain noise, biological noise, ocean turbulence noise, sea water thermal noise and the like. The research on the marine environmental noise is an important process for understanding the sea, is the basis for effectively using all acoustic equipment, and has important significance on marine research, underwater acoustic detection and ship engineering.
At present, for the measurement and research of the noise of the marine environment, basically only the sound pressure is used as a physical quantity, the vector hydrophone can synchronously pick up three components of the sound pressure and the particle vibration speed of a sound field at a spatial common point, the noise intensity information can be directly measured and obtained, a more comprehensive research means is provided from the perspective of acoustic energy, and the method has important research significance for the research and analysis of noise sources. In addition, the vector hydrophone can obtain the performance equivalent to a quaternary sound pressure array sonar system, has the advantages of cosine-shaped directivity irrelevant to frequency, strong capability of suppressing isotropic noise and the like, and can meet the requirement on low-noise target detection.
The marine environmental noise measurement requires that the vector hydrophone has the detection capability of weak acoustic signals, namely, a low self-noise level (generally, the self-noise level is required to be lower than the marine environmental noise value under the zero-order sea condition). The self-noise of the vector hydrophone is related to sensitive elements and structural parameters, most of the vector hydrophones pursue high sensitivity in the design process at present, and the design is rarely carried out aiming at the self-noise.
The patent No. CN200710072328.4 provides a composite same-vibration high-frequency triaxial vector hydrophone which mainly comprises a triaxial vibration sensor and a low-density composite material and is characterized in that the upper limit working frequency can reach 12.5kHz.
The patent number CN201110301913.3 proposes a co-vibrating vector receiver which can be used under deep water, which adopts a working mode of longitudinal vibration of a piezoelectric plate, and is characterized in deep water and low-frequency underwater acoustic measurement.
Patent No. cn202011189207.X, a vector hydrophone of a composite cymbal type piezoelectric ceramic transducer is proposed, which adopts a structural form of four groups of cymbal type piezoelectric ceramic transducers and a central inertial body, and is characterized by low frequency and high sensitivity.
None have been designed for self-noise.
Disclosure of Invention
The applicant aims at the defects in the prior art and provides a low-noise vector hydrophone, so that the detection of the underwater low-noise target of the ocean can be conveniently completed.
The technical scheme adopted by the invention is as follows:
a low-noise vector hydrophone comprises a vector hydrophone, and the specific structure of the vector hydrophone is as follows: the piezoelectric accelerometer comprises a piezoelectric accelerometer, a sound pressure sensor, a preamplifier circuit and an aluminum alloy shell, wherein an annular limiting rib is fixed at the position below the inner wall surface of the aluminum alloy shell, a piezoelectric accelerometer is installed on the inner wall surface of the aluminum alloy shell above the annular limiting rib through epoxy resin adhesive, and a piezoelectric wafer is bonded at the bottom of the inner side of the aluminum alloy shell to directly form the sound pressure sensor; the top surface of the piezoelectric accelerometer is fixedly provided with a preposed amplifying circuit through four copper columns.
The further technical scheme is as follows:
the structure of the piezoelectric accelerometer is as follows: the piezoelectric three-lamination device comprises a piezoelectric three-lamination piece, a brass mass block, a thimble and an aluminum alloy base, wherein two piezoelectric wafers with holes are respectively bonded on two sides of a brass backing by using a conductive adhesive to form the piezoelectric three-lamination piece, and a groove is formed in the inner side of the brass backing; the brass mass block is integrally of a cylindrical structure, four conical ejector pins are uniformly machined in the center line position of the side surface and used for supporting the brass mass block in a hanging mode, the aluminum alloy base is integrally of a cylindrical structure, four circular grooves with internal threads are uniformly distributed in the center line position of the side surface, the axial direction is a through hole, the brass mass block is located in the through hole, the gland is integrally of a cup-shaped structure, the outer surface is provided with external threads, a hexagonal through hole is formed in the bottom of the cup-shaped structure, four piezoelectric three-lamination sheets are fixed in the four circular grooves in the side surface of the aluminum alloy base respectively through the four glands, meanwhile, the brass mass block and the piezoelectric three-lamination sheets are fixed through the ejector pins, a brass backing groove is matched with the shape of the head of the ejector pin, and a gap between the brass mass block and the aluminum alloy base is filled with polyurethane rubber.
The sound pressure sensor adopts a piezoelectric double-lamination structure.
The specific mounting structure of the sound pressure sensor is as follows: the inner side and the outer side of the bottom of the aluminum alloy shell are both processed into a planar structure, a circular groove is formed in the inner side outer edge of the planar structure, the piezoelectric wafer is bonded in the groove, polyurethane rubber is filled in the outer side of the planar structure, a lead is led out of the piezoelectric wafer, and a sound pressure signal is transmitted to the pre-amplification circuit.
The center of the piezoelectric wafer is provided with a hole.
The structure of the preamplification circuit is as follows: the circuit comprises a voltage amplifier, four charge amplifiers, two differential amplifiers and three low-pass filters, wherein one path of sound pressure signal firstly enters the voltage amplifier to be amplified, and then a high-frequency signal is filtered by the low-pass filters; the four paths of sound particle vibration signals firstly enter a charge amplifier to complete charge or voltage conversion and primary amplification, then enter a differential amplifier to realize secondary differential amplification, and finally a low-pass filter filters high-frequency noise signals.
And a watertight connector is arranged in the middle of the top surface of the aluminum alloy shell and is used for vector hydrophone cable connection.
The aluminum alloy shell adopts a split structure.
The aluminum alloy shell is divided into an upper part and a lower part, and sealing is completed through epoxy resin glue.
The sections of the upper end surface and the lower end surface of the aluminum alloy shell are of oval structures.
The invention has the following beneficial effects:
(1) The vector hydrophone can detect very weak acoustic signals including acoustic pressure signals and acoustic vector signals in the measurement and detection of marine acoustics, so that a more precise marine noise field structure can be obtained, and underwater targets with lower noise can be found;
(2) The piezoelectric accelerometer in the vector hydrophone adopts a differential structure, so that the axial sensitivity is improved, the transverse sensitivity is reduced, and the influence caused by the rotation of the vector hydrophone can be inhibited;
(3) In the piezoelectric accelerometer, the parameters of the accelerometer are easily adjusted by adjusting the size of the mass block;
(4) In the sound pressure sensor, the piezoelectric ceramic piece is directly bonded on the inner surface of the aluminum alloy shell, so that the underwater sealing problem caused by a signal line cabin is avoided;
(5) The vector hydrophone adopts an aluminum alloy shell, so that external electromagnetic interference can be effectively shielded, and the measurement precision is improved;
(6) The aluminum alloy shell of the vector hydrophone is in a cylindrical shape with elliptical caps at two ends, and the influence caused by flow noise can be reduced.
(7) The invention relates to a low-noise vector hydrophone based on a piezoelectric three-lamination structure, which can be suitable for marine environment noise measurement and marine underwater low-noise target detection.
Drawings
FIG. 1 is a cross-sectional view of the construction of a vector hydrophone of the present invention.
Figure 2 is a cross-sectional view of the structure of the piezoelectric accelerometer of the present invention.
Fig. 3 is a schematic view of the structure of the sound pressure sensor of the present invention.
FIG. 4 is a functional schematic diagram of a preamplifier circuit of the invention.
Wherein: 100. a vector hydrophone; 110. a piezoelectric accelerometer; 120. a sound pressure sensor; 130. a pre-amplification circuit; 140. an aluminum alloy housing; 150. an annular spacing rib; 160. epoxy resin glue; 170. a copper pillar; 180. a watertight connector;
111. piezoelectric three-lamination; 112. a piezoelectric wafer with holes; 113. a conductive adhesive; 114. a brass backing; 115. a thimble; 116. a gland; 117. a brass mass block; 118. a urethane rubber; 119. an aluminum alloy base;
121. a piezoelectric wafer; 122. a circular groove; 123. a wire;
131. a sound pressure signal; 132. a sound particle vibration signal; 133. a voltage amplifier; 134. a charge amplifier; 135. a differential amplifier; 136. and a low-pass filter.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 4, the low-noise vector hydrophone of this embodiment includes a vector hydrophone 100, and the specific structure of the vector hydrophone 100 is as follows: the acoustic pressure sensor comprises a piezoelectric accelerometer 110, an acoustic pressure sensor 120, a pre-amplification circuit 130 and an aluminum alloy shell 140, wherein an annular limiting rib 150 is fixed at the lower position of the inner wall surface of the aluminum alloy shell 140, the piezoelectric accelerometer 110 is installed on the inner wall surface of the aluminum alloy shell 140 above the annular limiting rib 150 through epoxy resin glue 160, and a piezoelectric wafer 121 is bonded at the bottom position of the inner side of the aluminum alloy shell 140 to directly form the acoustic pressure sensor 120; the top surface of the piezoelectric accelerometer 110 is fixedly mounted with a preamplifier circuit 130 by four copper posts 170.
The structure of the piezoelectric accelerometer 110 is: the piezoelectric three-lamination-piece structure comprises a piezoelectric three-lamination piece 111, a brass mass block 117, a thimble 115 and an aluminum alloy base 119, wherein two piezoelectric wafers 112 with holes are respectively adhered to two sides of a brass backing 114 by using a conductive adhesive 113 to form the piezoelectric three-lamination piece 111, and a groove is formed in the inner side of the brass backing 114; the brass mass block 117 is integrally of a cylindrical structure, four conical thimbles 115 are evenly machined at the central line position of the side surface and used for supporting the brass mass block 117 in a suspended mode, the aluminum alloy base 119 is integrally of a cylindrical structure, four circular grooves with internal threads are evenly distributed at the central line position of the side surface, a through hole is formed in the axial direction, the brass mass block 117 is located in the through hole, the gland 116 is integrally of a cup-shaped structure, external threads are arranged on the outer surface, a hexagonal through hole is formed in the bottom of the gland, the four piezoelectric three-lamination sheets 111 are respectively fixed in the four circular grooves in the side surface of the aluminum alloy base 119 through the four glands 116, meanwhile, the brass mass block 117 and the piezoelectric three-lamination sheets 111 are fixed through the thimbles 115, the groove of the brass backing 114 is matched with the head portion of the thimbles 115, and a gap between the brass mass block 117 and the aluminum alloy base 119 is filled with polyurethane rubber 118.
The design of the hexagonal through hole is mainly convenient for screwing the gland 116 by an inner hexagonal wrench for tightening.
The sound pressure sensor 120 employs a piezoelectric dual stack structure.
The specific mounting structure of the sound pressure sensor 120 is: the bottom of the aluminum alloy shell 140 is processed into a plane structure, the inner side and the outer edge of the plane structure are provided with a circular groove 122, the piezoelectric wafer 121 is bonded in the circular groove 122, the outer side of the plane structure is filled with polyurethane rubber 118, the piezoelectric wafer 121 leads out a lead 123, and the sound pressure signal 131 is transmitted to the pre-amplification circuit 130.
The piezoelectric disc 121 has a hole in the center.
The pre-amplifier circuit 130 has the following structure: the circuit comprises a voltage amplifier 133, four charge amplifiers 134, two differential amplifiers 135 and three low-pass filters 136, wherein one path of sound pressure signal 131 firstly enters the voltage amplifier 133 to be amplified, and then a high-frequency signal is filtered by the low-pass filters 136; the four paths of acoustic particle vibration signals 132 firstly enter a charge amplifier 134 to complete charge or voltage conversion and primary amplification, then enter a differential amplifier 135 to realize secondary differential amplification, and finally pass through a low-pass filter 136 to filter high-frequency noise signals.
A watertight connector 180 is mounted in the middle of the top surface of the aluminum alloy shell 140 for cable connection of the vector hydrophone 100.
The aluminum alloy case 140 has a split structure.
The aluminum alloy housing 140 is divided into upper and lower portions, which are sealed with epoxy glue 160.
The cross-section of the upper and lower end surfaces of the aluminum alloy case 140 is an elliptical structure.
The pre-amplifier circuit 130 of the present invention is composed of a charge amplifier 134, a differential amplifier 135 and a low-pass filter 136, and is used for amplifying and filtering signals of the piezoelectric accelerometer 110 and the acoustic pressure sensor 120, so as to improve the signal-to-noise level of the signals.
The aluminum alloy housing 140 of the present invention is used to integrally seal the piezoelectric accelerometer 110, the acoustic pressure sensor 120, and the preamplifier circuit 130, and to make the average density of the vector hydrophone 100 consistent with that of seawater.
The vector hydrophone 100 disclosed by the invention is in a cylinder shape with micro negative buoyancy, and the upper end and the lower end of the vector hydrophone adopt semi-ellipsoidal shells as end covers, so that a better flow guide effect can be achieved.
The preamplification circuit 130 of the present invention is configured with a magnetic sensor for measuring the orientation of the vector hydrophone 100 itself.
The vector hydrophone 100 of the present invention may further include a data acquisition circuit therein for converting signals into digital signals and outputting the digital signals.
The vector hydrophone 100 disclosed by the invention can effectively monitor low-frequency noise signals below 1kHz in the ocean, and can realize accurate measurement even for infrasonic frequency signals within the range of 5-20 Hz.
As shown in fig. 1, the vector hydrophone 100 comprises a piezoelectric accelerometer 110, an acoustic pressure sensor 120, a preamplifier circuit 130, an aluminum alloy housing 140 and a water-tight connector 180. The vector hydrophone 100 is generally cylindrical in shape, and the piezoelectric accelerometer 110 is located at the center of the vector hydrophone 100 and rigidly fixed inside the aluminum alloy housing 140 by the annular restraining ribs 150 and the epoxy glue 160. The sound pressure sensor 120 is located inside the bottom of the aluminum alloy case 140. The pre-amplifier circuit 130 is fixed to the upper end of the piezoelectric accelerometer 110 by four copper posts 170. The aluminum alloy housing 140 is divided into upper and lower portions, which are sealed with epoxy glue 160. The watertight connector 180 is located on the uppermost portion of the aluminum alloy shell 140 and used for enabling the cable to penetrate through the cabin to achieve output of various signals of the vector hydrophone 100, and the watertight connector 180 and the aluminum alloy shell 140 are sealed through epoxy resin glue 160.
As shown in fig. 2, the piezoelectric accelerometer 110 is used for measuring an ambient noise particle vibration signal 132, and has a specific structure: consists of a piezoelectric tri-lamination sheet 111, a thimble 115, a brass quality block 117 an aluminum alloy base 119, a gland 116, and the like. Two perforated piezoelectric wafers 112 are respectively adhered to two sides of a brass backing 114 by using conductive adhesive 113 to form a piezoelectric three-lamination sheet 111, and a groove is arranged on the inner side of the brass backing 114. The brass mass block 117 is of a cylindrical structure as a whole, and four conical thimbles 115 are uniformly processed at the central line position of the side surface and are used for suspending and supporting the brass mass block 117. The aluminum alloy base 119 is of a cylindrical structure as a whole, four circular grooves with internal threads are uniformly distributed in the middle line position of the side surface, a through hole is axially formed in the middle line position, and the brass mass block 117 is located in the through hole. The gland 116 is integrally of a cup-shaped structure, the outer surface of the gland is provided with external threads, and the bottom of the gland is provided with a hexagonal through hole. The four piezoelectric three-lamination sheets 111 are respectively fixed in four circular grooves on the side surface of an aluminum alloy base 119 by four pressing covers 116, a brass mass block 117 and the piezoelectric three-lamination sheets 111 are fixed by a thimble 115, and the shape of a groove of a brass backing 114 is matched with that of the head of the thimble 115. The gap between the brass mass 117 and the aluminum alloy base 119 is filled with urethane rubber 118, which acts as a damping function.
As shown in fig. 3, the sound pressure sensor 120 is located inside the bottom of the aluminum alloy case 140 and is formed of a single piezoelectric wafer 121 having a through hole in the center, which contributes to further improvement in acoustic sensitivity. The inside and outside of a partial area at the bottom of the aluminum alloy shell 140 are processed into a plane structure, the circular groove 122 is arranged on the outer edge of the inner side of the plane to reduce the rigidity of the bending movement of the structure, the piezoelectric wafer 121 is bonded in the circular groove 122, and the polyurethane rubber 118 is filled on the outer side of the piezoelectric wafer to play a damping role. The wires 123 lead from the electrode surface on the piezoelectric wafer 121 and deliver the acoustic pressure signal 131 to the pre-amplifier circuit 130.
As shown in fig. 4, the pre-amplifier circuit 130 is used to pre-process the acoustic pressure signal 131 and the acoustic particle vibration signal 132 of the vector hydrophone 100, and includes a voltage amplifier 133, four charge amplifiers 134, two differential amplifiers 135, and three low-pass filters 136. One path of sound pressure signal 131 firstly enters a voltage amplifier 133 to be amplified, and then passes through a low-pass filter 136 to filter out a high-frequency signal. The four paths of acoustic particle vibration signals 132 firstly enter a charge amplifier 134 to complete charge/voltage conversion and primary amplification, then enter a differential amplifier 135 to realize secondary differential amplification, and finally pass through a low-pass filter 136 to filter high-frequency noise signals.
In actual operation, when the vector hydrophone 100 is placed in an underwater sound field, the vector hydrophone and sound particles of the sound field oscillate together and synchronously. The brass masses 117 within the vector hydrophone 100 are subjected to inertial forces and undergo relative displacement with respect to the aluminum alloy base 119. Inertial forces are applied to the piezo-electric tri-stack 111 via the four tapered spikes 115 to deform it. At this time, the perforated piezoelectric wafers 112 on both sides of the brass backing generate charge signals under the action of the forward piezoelectric effect, the charge signals are in direct proportion to the amplitude of the vibration acceleration of the sound dots and have the same phase, the piezoelectric three-lamination sheets 111 on the other side are configured in a parallel connection mode, and the piezoelectric three-lamination sheet 111 on the other side is configured in a differential mode for increasing the charge value to improve the sensitivity. The other axial working mode is the same. The wires are soldered to the surface of the piezoelectric tri-stack 111 and the resulting signal is fed to the preamplifier 130 for further signal acquisition and processing. On the other hand, due to the action of the sound wave pressure, the bottom shell of the vector hydrophone 100 is pressed to deform, and simultaneously drives the inner piezoelectric wafer 121 to deform, so that the piezoelectric wafer 121 generates a voltage signal proportional to the sound pressure signal due to the positive piezoelectric effect. Wires 123 are soldered to the surface of the piezoelectric wafer 121 and the resulting signal is fed to a pre-amplifier circuit 130 for further signal acquisition and processing.
The theoretical basis of the design of the invention is as follows:
when a low-noise amplifying circuit is adopted, the self-noise of the vector hydrophone mainly comes from the background noise of the internal accelerometer.
The background noise of the accelerometer consists of mechanical thermal balance noise and Johnson electrical thermal noise, and is represented by an acceleration power spectrum as follows:
in the formula (I), the compound is shown in the specification,
boltzmann constant K =1.381e-23J/K,
t is the absolute temperature of the molten metal,
ω n is the natural frequency of the frequency,
m is the mass of the inertia,
qm is the mechanical quality factor of the machine,
tan delta is the dielectric loss tangent of the alloy,
omega is the angular frequency of the wave to be generated,
ma is the accelerometer voltage sensitivity and,
c0 is the static capacitance.
According to the formula, when the structural form of the piezoelectric accelerometer is determined, the self noise can be structurally reduced by increasing the inertial mass, the sensitivity and the static capacitance.
Therefore, in the invention, the sensitivity and the resonant frequency are adjusted by arranging the independent mass block outside the three-lamination to increase the inertia mass. In addition, the prestress of the three laminated sheets is changed by adjusting the length of the thimble, and the sensitivity of the accelerometer is optimized.
The above description is intended to be illustrative, and not restrictive, the scope of the invention being indicated by the claims, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A low noise vector hydrophone, comprising: the hydrophone comprises a vector hydrophone (100), wherein the specific structure of the vector hydrophone (100) is as follows: the acoustic pressure sensor comprises a piezoelectric accelerometer (110), an acoustic pressure sensor (120), a preamplification circuit (130) and an aluminum alloy shell (140), wherein an annular limiting rib (150) is fixed at the lower position of the inner wall surface of the aluminum alloy shell (140), the piezoelectric accelerometer (110) is installed on the inner wall surface of the aluminum alloy shell (140) above the annular limiting rib (150) through epoxy resin glue (160), and a piezoelectric wafer (121) is bonded at the bottom position of the inner side of the aluminum alloy shell (140) to directly form the acoustic pressure sensor (120); the top surface of the piezoelectric accelerometer (110) is fixedly provided with a preposed amplifying circuit (130) through four copper columns (170).
2. The low noise vector hydrophone of claim 1 wherein: the piezoelectric accelerometer (110) is structurally characterized in that: the piezoelectric three-lamination-piece structure comprises a piezoelectric three-lamination piece (111), a brass mass block (117), a thimble (115) and an aluminum alloy base (119), wherein two piezoelectric wafers (112) with holes are respectively adhered to two sides of a brass backing (114) by utilizing a conductive adhesive (113) to form the piezoelectric three-lamination piece (111), and a groove is formed in the inner side of the brass backing (114); the brass mass block (117) is integrally of a cylindrical structure, four conical ejector pins (115) are uniformly machined in the center line position of the side surface and used for supporting the brass mass block (117) in a suspended mode, the aluminum alloy base (119) is integrally of a cylindrical structure, four circular grooves with internal threads are uniformly distributed in the center line position of the side surface, a through hole is formed in the axial direction, the brass mass block (117) is located in the through hole, the gland (116) is integrally of a cup-shaped structure, the outer surface of the gland is provided with external threads, hexagonal through holes are formed in the bottom of the gland, four piezoelectric three-lamination sheets (111) are respectively fixed in the four circular grooves in the side surface of the aluminum alloy base (119) through the four glands (116), meanwhile, the brass mass block (117) and the piezoelectric three-lamination sheets (111) are fixed through the ejector pins (115), the groove of the brass backing (114) is matched with the head of the ejector pins (115), and a gap between the brass mass block (117) and the aluminum alloy base (119) is filled with polyurethane rubber (118).
3. The low noise vector hydrophone of claim 1 wherein: the sound pressure sensor (120) is of a piezoelectric double-lamination structure.
4. The low noise vector hydrophone of claim 1 wherein: the specific mounting structure of the sound pressure sensor (120) is as follows: the inner side and the outer side of the bottom of the aluminum alloy shell (140) are both processed into a planar structure, a circular groove (122) is formed in the inner side and the outer edge of the planar structure, the piezoelectric wafer (121) is bonded in the circular groove (122), polyurethane rubber (118) is filled in the outer side of the planar structure, a lead (123) is led out of the piezoelectric wafer (121), and a sound pressure signal is transmitted to the preamplifier circuit (130).
5. The low-noise vector hydrophone of claim 4, wherein: the piezoelectric wafer (121) is provided with a hole in the center.
6. The low noise vector hydrophone of claim 1 wherein: the structure of the preamplifier circuit (130) is as follows: the circuit comprises a voltage amplifier (133), four charge amplifiers (134), two differential amplifiers (135) and three low-pass filters (136), wherein one path of sound pressure signal (131) firstly enters the voltage amplifier (133) to be amplified, and then a high-frequency signal is filtered by the low-pass filters (136); the four paths of sound particle vibration signals (132) firstly enter a charge amplifier (134) to complete charge or voltage conversion and primary amplification, then enter a differential amplifier (135) to realize secondary differential amplification, and finally a low-pass filter (136) is used for filtering high-frequency noise signals.
7. The low-noise vector hydrophone of claim 1, wherein: and a watertight connector (180) is arranged in the middle of the top surface of the aluminum alloy shell (140) and is used for cable connection of the vector hydrophone (100).
8. The low noise vector hydrophone of claim 1 wherein: the aluminum alloy shell (140) adopts a split structure.
9. The low-noise vector hydrophone of claim 1, wherein: the aluminum alloy shell (140) is divided into an upper part and a lower part, and the upper part and the lower part are mutually sealed through epoxy resin glue (160).
10. The low-noise vector hydrophone of claim 1, wherein: the cross sections of the upper end surface and the lower end surface of the aluminum alloy shell (140) are of an oval structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117412218A (en) * | 2023-12-14 | 2024-01-16 | 青岛国数信息科技有限公司 | Hydrophone and manufacturing process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117412218A (en) * | 2023-12-14 | 2024-01-16 | 青岛国数信息科技有限公司 | Hydrophone and manufacturing process |
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