Composite sensor suitable for high navigational speed measurement

Abstract

The invention relates to a composite sensor suitable for high-navigational-speed measurement. The composite sensor is characterized in that the whole composite sensor is of an integrated columnar structure; the lower end of the phased array transducer located at the bottom is covered with a layer of vulcanized rubber to form a streamline surface; the electronic cabin is mounted at the upper end of the phased array transducer; the impedance matching plate is mounted in an inner cavity of the electronic cabin, and the lower end of the phased array cable is electrically connected with the impedance matching plate; the electromagnetic speed measurement assembly is mounted at the upper end of the electronic cabin; the upper end part of the electromagnetic speed measurement assembly and the lower end part of the rod body are inserted, positioned and matched and are hermetically and fixedly connected; the handle is arranged on the rod body in a sleeving mode, and the locking block is screwed into the external thread at the upper end of the rod body so that the handle can be fixed. An external connection hole is formed in the handle, so that the sensor can be mounted on a ship body; the connector mounting block is fixed at the upper end of the handle; the two watertight connectors are mounted at the upper end of the connector mounting block left and right; the lower end of the electromagnetic speed measurement cable is electrically connected with the electromagnetic speed measurement assembly, and the upper ends of the two cables are connected with the two watertight connectors respectively. The problem that acoustic velocity measurement is unstable at a high speed is solved.

Description

Technical Field

[0001] The invention relates to the field of propagation speed measuring devices, and more particularly to a composite sensor suitable for high-speed ship speed measurement. Background Art

[0002] The speed of a ship occupies a very important position among its many performance characteristics. The increase in ship speed has put forward higher requirements on the adaptability of ship equipment, especially acoustic measuring equipment such as acoustic speed logs and acoustic depth sounders, to high-speed working conditions. There are cases showing that the speed measurement performance of Doppler speed logs is seriously reduced or even unable to measure speed when the speed is above 20kn. The depth sounder also has the problem of being unable to measure depth at high speed.

[0003] According to ship principles and related foreign research, when a ship is sailing, a layer of ocean current rich in bubbles will form on the bottom surface of the ship, which is close to the hull. The ocean current layer gradually deteriorates with the increase of speed and affects the stability of the flow field at the bottom of the ship. Cavitation may even occur at extremely high speeds. Since the bubbles around the hull have a considerable drag reduction effect, this research direction has always received widespread attention in the field of ship design at home and abroad, and is also one of the main factors that must be considered for ships to achieve high speeds.

[0004] Acoustic transducers are usually installed close to the hull at about 1 / 3 of the distance from the bow. Figure 1 The location has better flow field stability in the whole ship, but in actual application, when the speed exceeds 20kn, the flow field in this part presents complex uncertainty and unpredictability. According to the research report, the main factor affecting the performance of acoustic equipment is the bow flow bubble, which is generally recognized by industry experts.

[0005] Given the sensitivity of acoustic measurement equipment to bubbles in the measurement area, under high-speed conditions, when the bubble richness of the flow field in the installation area is sufficient to affect the normal transmission and reception of the transducer sound waves, the speed measurement accuracy and stability will be reduced, or even the speed measurement will be impossible. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention proposes a composite sensor suitable for measuring speed at high ship speeds.

[0007] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0008] A composite sensor suitable for high-speed speed measurement, the composite sensor as a whole is an integrated columnar structure; including a phased array transducer, an electronic cabin, an electromagnetic speed measurement component, a rod body, a handle, a watertight connector mounting block, a first watertight connector, a second watertight connector, a phased array cable, an electromagnetic speed measurement cable, an impedance matching plate, and a locking block;

[0009] The phased array transducer is located at the bottom of the sensor, and its lower end is covered with a layer of vulcanized rubber by vulcanization process to form a streamlined surface; the electronic cabin is installed on the upper end of the array transducer in a sealed contact manner; the lower end of the electronic cabin is open to form an internal cavity, the impedance matching board is installed in the internal cavity of the electronic cabin, and the lower end of the phased array cable is electrically connected to the impedance matching board; the electromagnetic speed measuring component is installed on the upper end of the electronic cabin in a sealed contact manner; the upper end of the electromagnetic speed measuring component is inserted and positioned with the lower end of the rod body, and is sealed and fixedly connected; the upper end of the rod body is an externally threaded cylinder, and the handle is set on the externally threaded cylinder in a lower limit manner The handle is arranged on the column, and the locking block is screwed into the threaded column to fix the handle; the handle is provided with an external connection hole, which is fixedly connected to a fixing frame or a liftable bracket at the lower end of the hull through the external connection hole, so that the composite sensor extends into the water under the hull; the connector mounting block is fixed to the upper end of the handle; the watertight connector 1 and the watertight connector 2 are installed on the upper end of the connector mounting block on the left and right; the lower end of the electromagnetic speed measuring cable is electrically connected to the electromagnetic speed measuring assembly, and the upper ends of the two cables are respectively connected to the watertight connector 1 and the watertight connector 2; the middle part of the shell of the electromagnetic speed measuring assembly adopts a column structure with a wing-shaped cross-section.

[0010] Moreover, the phased array transducer is a planar array, composed of 1-3 type piezoelectric composite ceramic material, the spacing between adjacent transducer elements is 1.25 mm, the effective diameter of the piezoelectric ceramic phase is 100±2 mm, and the resonant frequency is 600 kHz.

[0011] Furthermore, the impedance matching board is composed of a transformer, an inductor, and a resistor, and includes four impedance transformation channels to achieve the functions of tuning and impedance transformation.

[0012] Moreover, the electromagnetic speed measuring component includes a divider, the shell, a guide rod, a coil assembly, and an electrode assembly; the divider is fixed to the upper end of the shell; a rectangular through hole is opened in the middle part of the shell, and a waist-shaped hole is opened at the center axis of the shell at the upper end of the rectangular through hole. Both ends of the guide rod are waist-shaped shafts, one end of which is inserted into the waist-shaped hole of the shell and fastened and sealed by bonding; the coil assembly and the other end of the guide rod are fastened and sealed by bonding.

[0013] Moreover, a wiring hole is provided inside the shell of the electromagnetic speed measurement component, and the phased array cable passes through the wiring hole and is physically and electromagnetically isolated from the coil component of the electromagnetic speed measurement component; the phased array cable and the electromagnetic speed measurement cable respectively pass through two isolated wiring channels in the splitter, and the phased array cable and the electromagnetic speed measurement cable are respectively provided with a metal wire mesh shielding tube outside the rod body.

[0014] Moreover, the electrode plate of the electrode assembly adopts a conformal design structure with the airfoil-like shape of the shell, which is used to reduce water flow disturbance caused by the shape at high speed;

[0015] Moreover, the electrodes of the electrode assembly adopt a conformal design structure with the corresponding electrode plate to reduce water flow disturbance caused by the shape at high speed.

[0016] The advantages and positive effects of the present invention are:

[0017] 1. The present invention adopts a structure that combines a rod-type electromagnetic speed measurement component with a phased array transducer array, which can achieve accurate data compensation of acoustic speed measurement using electromagnetic speed measurement under high-speed conditions, solving the problem of instability of acoustic speed measurement at high speeds.

[0018] 2. The lower end of the phased array transducer of the present invention is covered with a layer of vulcanized rubber by a vulcanization process to form a streamlined surface, which can improve the acoustic velocity measurement performance at high speeds.

[0019] 2. The middle part of the shell of the electromagnetic speed measuring component described in the present invention adopts a columnar structure with a wing-shaped cross-section, which can greatly reduce the influence of water flow disturbance near the electromagnetic speed measuring component on the flow velocity signal, improve the speed measurement stability, and at the same time increase the cavitation critical speed, thereby facilitating stable speed measurement under high-speed conditions.

[0020] 3. The electrode plate of the electrode assembly of the present invention adopts a conformal design structure with the wing-like shape of the shell, and the electrode adopts a conformal design structure with the corresponding electrode plate, both of which can reduce water flow disturbance caused by the shape at high speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the current and bubble distribution under the ship;

[0022] Figure 2 2a is a front view; 2b is a side view;

[0023] Figure 3 It is an overall cross-sectional view of the invented composite sensor;

[0024] Figure 4 4a is a cross-sectional view; 4b is a side view of the electromagnetic speed measuring assembly of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the invented coil assembly;

[0026] Figure 6 is a cross-sectional view of the coil assembly of the present invention;

[0027] Figure 7 is a schematic diagram of the structure of the electrode assembly of the present invention;

[0028] Figure 8 This is the circuit diagram of the bright impedance matching board;

[0029] Fig. 9It is the wiring diagram of the watertight connector and wires;

[0030] Fig.10 It is a schematic diagram of phased array arrangement, 10a, front view; 10, back view;

[0031] Fig.11 This is a schematic diagram of the leads on the rear radiating surface of the phased array. DETAILED DESCRIPTION

[0032] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Please see attached Figure 2-11 A composite sensor suitable for high-speed speed measurement of the present invention comprises:

[0037] Phased array transducer 1, electronic cabin 2, electromagnetic speed measurement component 3, rod body 4, handle 5, watertight connector mounting block 6, watertight connector one 7, watertight connector two 8, phased array cable 9, electromagnetic speed measurement cable 10, impedance matching plate 11, stud 12, locking block 13, etc.

[0038] The upper end of the phased array transducer 1 is a plane, and the electronic cabin 2 is installed on the upper surface of the phased array transducer 1, and the seal between the two is achieved through an O-ring. The lower end of the phased array transducer is covered with a layer of vulcanized rubber by vulcanization process to form a streamlined surface, which can improve the acoustic velocity measurement performance at high speed.

[0039] The lower end of the electronic cabin 2 is open, an impedance matching plate 11 is installed in the inner cavity of the electronic cabin 2 , and the phased array cable 9 is electrically connected to the impedance matching plate 11 .

[0040] The upper end of the electronic cabin 2 is a plane, and the electromagnetic speed measuring assembly 3 is installed on the upper surface of the electronic cabin 2, and the sealing between the two is achieved by an O-ring.

[0041] The upper end of the electromagnetic speed measuring component 3 is a protruding shaft structure, which is embedded in the lower end hole of the rod body 4, and the end faces of the two are fitted together, and then fastened by a stud 12 and a nut, and the seal between the two is achieved by an O-ring.

[0042] The upper end of the rod body 4 is an externally threaded cylinder. After the handle 5 is inserted into the cylinder, the locking block 13 is screwed into the thread to fix the handle 5.

[0043] The watertight connector mounting block 6 is mounted on the upper end surface of the handle 5 and is fastened with screws.

[0044] The watertight connector 1 7 and the watertight connector 2 8 are mounted on the upper end surface of the watertight connector mounting block 6 and fastened with screws.

[0045] The electromagnetic speed measuring assembly 3 comprises a distributor 31, a shell 32, a guide rod 33, a coil assembly 34, an electrode assembly 35, an O-ring 36, an O-ring 37, etc., and the shell is made of copper.

[0046] Specifically, the shell 32 is composed of three sections from top to bottom. The upper flange provides a mounting surface for the splitter 31, the lower flange provides a mounting surface for the electronic cabin 2, and the middle part is a column with a wing-shaped cross-section. A 162×37 rectangular through hole is opened in the middle part, and a waist-shaped hole is opened at the center axis of the upper shell of the rectangular through hole. Both ends of the guide rod 33 are waist-shaped shafts, one end of which is inserted into the waist-shaped hole of the shell. The mutual position accuracy is ensured through design and processing, ensuring that the relative position relationship between the coil assembly 34 and the shell 32 is accurate. The guide rod 33 and the shell are fastened and sealed by epoxy resin bonding.

[0047] Specifically, the coil assembly 34 is mounted on the guide rod 33 , fastened by epoxy resin bonding, and electrically connected to the watertight connector 2 8 .

[0048] Specifically, the splitter 31 is fastened to the housing 32 with six fixing screws, and two wiring channels are opened in the middle to separately route the phased array cable 9 and the electromagnetic speed measurement cable 10, and lead them out from the central hole of the upper protruding shaft and another eccentric hole.

[0049] Specifically, since the phased array cable 9 and the electromagnetic speed measurement cable 10 cannot be physically isolated in the rod body, electromagnetic shielding heat shrink tubes can be used to cover the outside of the cables respectively to perform effective EMI shielding.

[0050] Specifically, the coil assembly 34 is composed of an upper frame 1-8, a lower frame 1-5, an upper coil core 1-7, a lower coil core 1-2, an upper coil 1-6, a lower coil 1-1, an adjustment block 1-3, an adjustment fastening screw 1-4, etc. Figure 5 As shown, from left to right are the lower coil 1-1, the lower coil core 1-2, the adjustment block 1-3, the adjustment fastening screw 1-4, the lower frame 1-5, the upper coil 1-6, the upper coil core 1-7, and the upper frame 1-8. The upper coil 1-6 is sleeved on the outside of the upper coil core 1-7, and the lower coil 1-1 is sleeved on the outside of the lower coil core 1-2. The 15-inch wide boss on the right side of the upper coil core 1-7 is embedded in the 15-inch wide groove opened in the upper frame 1-8, and the two are bonded and fixed by epoxy resin; the 15-inch wide boss on the right side of the upper coil core 1-7 is embedded in the 15-inch wide groove opened in the lower frame 1-5, and the two are bonded and fixed by epoxy resin; the arc surface of the lower frame 1-5 matches the arc surface of the adjustment block 1-3, and the arc surface of the adjustment block 1-3 can rotate around the arc surface of the lower frame 1-5. After determining that the upper coil 1-6 and the lower coil 1-1 are in the same direction, the two are fastened by adjusting the fastening screw 1-4; the 15-inch wide boss on the right side of the lower coil core 1-2 is embedded in the 15-inch wide groove opened in the adjustment block 1-3, and the two are bonded and fixed by epoxy resin.

[0051] In the above-mentioned embodiment of the present invention, the upper coil core and the lower coil core are made of 1J50 iron-nickel soft magnetic alloy and are processed into an I-shaped core, which has the characteristics of high magnetic permeability, high saturation magnetic induction intensity, low hysteresis loss, etc., and can reduce the size of the coil core to ensure that there is enough potting space inside.

[0052] The core material adopts the following heat treatment process: H2 heating to 1150℃ and keeping it for 5 hours, cooling to 600℃ at 100℃ / hour, and cooling to below 300℃ at ≥400℃ / hour to ensure that it obtains the best magnetic and mechanical properties.

[0053] In the above embodiment of the present invention, the upper frame and the lower frame are made of modified epoxy dicyandiamide (ether) and solidified as one body after hot pressing, and have high mechanical strength and dielectric properties, good dimensional stability, heat resistance, moisture resistance and impact resistance.

[0054] In the above-mentioned embodiment of the present invention, after the upper coil and the lower coil are wound, they are wrapped with shielding copper foil on the outside, led out with a wire, and glass cloth tape is wrapped around the outer surface of the shielding copper foil, and vacuum dipped with epoxy insulating paint.

[0055] The coil assembly is installed on one side of the electrode assembly located in the inner cavity of the shell and is electrically connected to the watertight connector; the magnetic field is generated by the coil assembly, the electrode is exposed to seawater, the seawater and the ship move relative to each other, cutting the magnetic lines of force, and generating a signal that is linearly proportional to the relative water flow speed, thereby realizing the detection of the ship speed.

[0056] Specifically, the electrode assembly 35, such as Figure 7 As shown, it is divided into electrode assembly 1 and electrode assembly 2. Electrode assembly 1 includes electrode plate 1 2-1, electrode 1 2-2, welding piece 1 2-3, nut 1 2-4 and electrode wire 1 2-5, etc. Electrode assembly 2 includes electrode plate 2 3-1, electrode 2 3-2, welding piece 2 3-3, nut 2 3-4 and electrode wire 2 3-5, etc. Electrode 1 is arranged on the outer surface of electrode plate 1, and conformal design is adopted, and the outer surfaces of the two are consistent; electrode 2 is arranged on the outer surface of electrode plate 2, and conformal design is adopted, and the outer surfaces of the two are consistent. Welding piece one is arranged on the inner surface of electrode plate one at a position corresponding to electrode one, and a nut 2-4 is screwed into the thread at the rear of electrode one to press welding piece one, and is sealed by epoxy resin; electrode wire one is electrically connected to welding piece one by electric welding, and the other end is electrically connected to watertight connector 2 8; welding piece two is arranged on the inner surface of electrode plate two at a position corresponding to electrode two, and a nut 2-4 is screwed into the thread at the rear of electrode two to press welding piece two, and is sealed by epoxy resin; electrode wire two is electrically connected to welding piece two by electric welding, and the other end is electrically connected to watertight connector 2 8.

[0057] Specifically, because the magnitude of the magnetic field strength decreases as the distance between the electrode surface and the excitation coil increases, the design requires that the distance between the electrode 1 and the electrode 2 and the coil assembly 34 be as close as possible.

[0058] Specifically, fluid simulation technology was used to simulate and optimize the shell shape of the electromagnetic speed measuring component. The final design results were verified through water tunnel tests, and it was finally determined that the use of an airfoil-like shape can greatly reduce the impact of water flow disturbances near the electromagnetic speed measuring component on the flow velocity signal, improve the speed measurement stability, and at the same time increase the cavitation critical speed, making it easier to achieve stable speed measurement under high-speed conditions.

[0059] Specifically, the electromagnetic speed measurement component adopts epoxy resin bonding and casting technology, which has high bonding strength. The electrode component, coil component, shell, etc. are cast with epoxy resin and formed into a rigid body after high-temperature curing, and have high mechanical strength.

[0060] Whether the combination of the shell and the epoxy resin glue is tight and reliable is also particularly critical in the casting, so the mechanical processing quality and surface treatment process of the shell are extremely important. The shell should be fully considered when designing, and sharp corners and edges should be avoided as much as possible. Since the linear expansion coefficient of epoxy resin glue is much larger than that of metal materials, when metal materials are involved in the casting process, the thermal stress caused by temperature changes should be considered. It is this thermal stress and the shrinkage stress generated when the resin is cured that together constitute the internal stress of the solidified material, and this internal stress is often concentrated at the sharp corners of the metal material, especially after the curing reaction is completed. If the temperature drops too quickly, this stress will cause cracking, delamination and debonding of the solidified material. Therefore, the sharp corners and edges of the shell are inverted into R angles. After eliminating the sharp corners and edges, not only the bonding adhesion between the epoxy resin glue and the shell is improved, but also the stress concentration of the casting caused by the sharp corners and edges of the shell is prevented.

[0061] The 600kHz phased array transducer array consists of nearly a thousand independent transducer elements (such as Fig.10 As shown), the spacing between the transducers is 1.25 mm (according to the sound speed C = 1500 m / s), and the parallel connection between the transducer elements is Fig.11 The front radiating surface of the phased array is a common negative electrode, and an X-shaped lead is used to finally form eight transducer sub-arrays, namely X1, X2, X3, X4, Y1, Y2, Y3, and Y4.

[0062] Transducer array and parameter requirements:

[0063] 1) Transducer array material: 1-3 composite material

[0064] 2) Effective diameter of ceramic: 100±5mm

[0065] 3) The distance between each adjacent transducer is 1.25mm

[0066] 4) The front radiating surface of the phased array is a common negative pole.

[0067] 5) The connection of the rear radiation surface of the phased array is as follows Fig.11 As shown, an X-shaped lead is used to eventually form 8 transducer arrays, namely X1, X2, X3, X4, Y1, Y2, Y3, and Y4.

[0068] 6) Array natural horizontal / vertical directivity opening angle: θ≤2.5°;

[0069] 7) Side lobe under natural directivity of the array: δ≤-15dB;

[0070] 8) Maximum transmission voltage response level under natural directivity conditions of the array: Sv ≥ 185dB;

[0071] 9) Maximum emission sound source level under natural directivity conditions of the array: ≥230dB.

[0072] The input impedance and output impedance of the back-end processing circuit are both 50Ω, while the impedance of the phased array transducer is a non-standard value. In order to achieve impedance matching, an impedance matching board is required to achieve impedance transformation. The impedance matching board consists of 4 RM8 transformers to achieve impedance transformation between the phased array transducer and the back-end processing circuit.

[0073] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0074] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0075] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A composite sensor suitable for high-speed speed measurement, characterized in that: The composite sensor is an integrated columnar structure as a whole; it includes a phased array transducer, an electronic cabin, an electromagnetic speed measurement component, a rod body, a handle, a watertight connector mounting block, a watertight connector 1, a watertight connector 2, a phased array cable, an electromagnetic speed measurement cable, an impedance matching plate, and a locking block; The phased array transducer is located at the bottom of the sensor, and its lower end is covered with a layer of vulcanized rubber by vulcanization process to form a streamlined surface; the electronic cabin is installed on the upper end of the phased array transducer in a sealed contact manner; the lower end of the electronic cabin is open to form an internal cavity, the impedance matching board is installed in the internal cavity of the electronic cabin, and the lower end of the phased array cable is electrically connected to the impedance matching board; the electromagnetic speed measuring component is installed on the upper end of the electronic cabin in a sealed contact manner; the upper end of the electromagnetic speed measuring component is inserted and positioned with the lower end of the rod body, and is sealed and fixedly connected; the upper end of the rod body is an externally threaded cylinder, and the handle is mounted on the externally threaded cylinder in a lower limit manner The invention relates to a threaded cylinder, and a locking block is screwed into the externally threaded cylinder to fix the handle; the handle is provided with an external connection hole, and is fixedly connected to a fixing frame or a liftable bracket at the lower end of the hull through the external connection hole, so that the composite sensor is extended into the water body under the hull; the connector mounting block is fixed to the upper end of the handle; a watertight connector 1 and a watertight connector 2 are installed on the left and right sides of the upper end of the connector mounting block; the lower end of the electromagnetic speed measuring cable is electrically connected to the electromagnetic speed measuring assembly, and the upper ends of the two cables are respectively connected to the watertight connector 1 and the watertight connector 2; the middle part of the shell of the electromagnetic speed measuring assembly adopts a column structure with a wing-shaped cross-section.

2. The composite sensor suitable for high-speed speed measurement according to claim 1 is characterized in that: The phased array transducer is a planar array, made of 1-3 type piezoelectric composite ceramic material, the spacing between adjacent transducer elements is 1.25 mm, the effective diameter of the piezoelectric ceramic phase is 100±2 mm, and the resonant frequency is 600 kHz.

3. The composite sensor suitable for high-speed speed measurement according to claim 1 is characterized in that: The impedance matching board is composed of a transformer, an inductor, and a resistor, and includes 4 impedance transformation channels to achieve the functions of tuning and impedance transformation.

4. The composite sensor suitable for high-speed speed measurement according to claim 1 is characterized in that: The electromagnetic speed measuring assembly includes a divider, a shell, a guide rod, a coil assembly, and an electrode assembly; the divider is fixed to the upper end of the shell; a rectangular through hole is opened in the middle part of the shell, and a waist-shaped hole is opened at the center axis of the shell at the upper end of the rectangular through hole. Both ends of the guide rod are waist-shaped shafts, one end of which is inserted into the waist-shaped hole of the shell and fastened and sealed by bonding; the coil assembly and the other end of the guide rod are fastened and sealed by bonding.

5. The composite sensor suitable for high-speed speed measurement according to claim 4 is characterized in that: A wiring hole is provided inside the shell of the electromagnetic speed measurement component, and the phased array cable passes through the wiring hole and is physically and electromagnetically isolated from the coil component of the electromagnetic speed measurement component; the phased array cable and the electromagnetic speed measurement cable respectively pass through two isolated wiring channels in the splitter, and the phased array cable and the electromagnetic speed measurement cable are respectively provided with a metal wire mesh shielding tube outside the rod body.

6. The composite sensor suitable for high-speed speed measurement according to claim 4 is characterized in that: The electrode plate of the electrode assembly adopts a conformal design structure with the airfoil-like shape of the shell.

7. The composite sensor for high-speed ship speed measurement according to claim 6 is characterized in that: The electrodes of the electrode assembly adopt a conformal design structure with the corresponding electrode plate.

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