An ultrasonic transducer hydrophone applied to single-channel seismic reflection wave method in water area

Abstract

The application relates to an ultrasonic transducing hydrophone applied to a water area single-channel seismic reflection wave method, which comprises an ultrasonic transducer and a high-frequency cable line; a plurality of ultrasonic transducers are coaxially and spaced apart, and the plurality of ultrasonic transducers are connected in parallel; one end of the high-frequency cable line is connected with the ultrasonic transducer, and the other end is correspondingly connected with a collecting device; the ultrasonic transducer comprises an outer cylinder, a piezoelectric ceramic, a damping block and a matching layer; the application adopts the mode of combined ultrasonic transducer, combines signals of the plurality of ultrasonic transducers into one signal, strengthens real seismic signals, suppresses noise, improves signal quality, and increases the range of received seismic signals; the whole hydrophone is small in size, convenient to carry, can better adapt to the arrangement and operation of special occasions, and solves the technical problems of high import cost and difficulty in importing small trace intervals.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydrophones, in particular to an ultrasonic transducing hydrophone applied to a water area single-channel seismic reflection wave method. BACKGROUND

[0002] The water area single-channel seismic reflection wave method exploration is a commonly used geophysical exploration method, which is used for detecting the characteristics of underwater geological structure and sediment; the method places a sound source and a hydrophone underwater, utilizes the reflection and refraction of seismic waves in the ground, and obtains information of the underground structure. The water area single-channel seismic reflection wave method exploration has wide application in the fields of marine placer reserves evaluation, seabed geological survey, cross-sea bridge, and geological survey of port terminals, for example, the method can help determine the location and scale of placer, and evaluate seabed geological conditions, thereby providing an important basis for the planning and design of marine engineering.

[0003] The water area single-channel seismic reflection wave method exploration equipment in the prior art is mainly imported equipment from abroad, which is expensive. Since the small trace interval hydrophone is still on the list of prohibited sales in the United States, it is difficult to import the small trace interval hydrophone. Moreover, the current water area single-channel seismic reflection wave method has a large equipment, and the linear length of the acquisition unit is generally more than 20 meters. Therefore, the method can only be used in a drag type construction, which is inconvenient and has great limitations. The method is not applicable in some occasions, such as existing bridges, port terminals, and occasions with high frequency of ships. SUMMARY

[0004] In order to overcome the deficiencies in the background art, the application discloses an ultrasonic transducing hydrophone applied to a water area single-channel seismic reflection wave method.

[0005] To achieve the above-mentioned application purposes, the application adopts the following technical solutions:

[0006] An ultrasonic transducing hydrophone applied to a water area single-channel seismic reflection wave method, comprising:

[0007] A plurality of ultrasonic transducers are coaxially and spaced apart, and the plurality of ultrasonic transducers are connected in parallel.

[0008] A high-frequency cable is connected to one end of the ultrasonic transducer, and the other end is connected to an acquisition device.

[0009] The ultrasonic transducer comprises:

[0010] An outer cylinder with an open upper end;

[0011] A plurality of piezoelectric ceramics are stacked up and down, and are coaxially arranged in the inner cavity of the outer cylinder, and are used for emitting and receiving ultrasonic waves.

[0012] A damping block is located in the inner cavity of the outer cylinder above the piezoelectric ceramic to absorb and shield interference above the piezoelectric ceramic, thereby reducing noise.

[0013] A matching layer is located in the inner cavity of the outer cylinder below the piezoelectric ceramic, and is used to match the acoustic impedance in order to broaden the operating frequency band of the ultrasonic transducer.

[0014] In this high-frequency cable, the positive wire is connected to the top surface of the uppermost piezoelectric ceramic, and the high-frequency cable is connected to the bottom surface of the lowermost piezoelectric ceramic.

[0015] Preferably, both the bottom and top surfaces of the piezoelectric ceramic are coated with a silver layer.

[0016] Preferred options also include:

[0017] The housing covers all ultrasonic transducers to facilitate the fixation of all ultrasonic transducers in their positions.

[0018] The outer casing has an opening at one end for inserting a high-frequency cable, and the opening is equipped with a sealing and clamping assembly.

[0019] Preferably, the sealing crimping assembly includes:

[0020] The internal and external threaded sleeve is fitted onto the body of the high-frequency cable and is axially screwed to the inner wall of the opening. The lower section of the inner wall of the internal and external threaded sleeve is provided with a reduced diameter section.

[0021] A flexible sealing ring is fitted onto the body of the high-frequency cable and is located within the inner cavity of the inner and outer threaded sleeve.

[0022] Hollow screw plugs are fitted onto the body of high-frequency cables, with one end screwed into the inner cavity of the inner and outer threaded sleeves to facilitate the compression of flexible sealing rings.

[0023] Preferably, the end of the outer shell facing away from the opening is a tapered end.

[0024] Preferably, the distance between adjacent ultrasonic transducers is 0.3 to 0.7 m.

[0025] Preferably, the number of ultrasonic transducers is 2 to 4.

[0026] Preferably, the number of piezoelectric ceramics in each ultrasonic transducer is 3 or 4.

[0027] Preferably, the piezoelectric ceramic has an inverted conical structure with an open top, so that all the piezoelectric ceramics can be stacked one on top of the other, so that adjacent piezoelectric ceramics can fit together tightly.

[0028] Preferably, the high-frequency cable is connected to the acquisition device via an amplifier circuit.

[0029] By employing the technical solution described above, the present invention has the following beneficial effects:

[0030] 1. Due to the damping block, the ultrasonic waves above the piezoelectric ceramic can be absorbed, thus reducing noise.

[0031] 2. Due to the matching layer, it can match the acoustic impedance between the ultrasonic transducer and the working load, so as to broaden the working frequency band of the ultrasonic transducer and thus improve the ultrasonic resolution and working adaptability.

[0032] 3. The uniformity of the piezoelectric ceramic voltage is ensured by coating both the top and bottom surfaces with silver layers.

[0033] 4. By using a combination of ultrasonic transducers, the signals from multiple ultrasonic transducers are combined into one signal, which enhances the real seismic signal and suppresses noise, thereby improving signal quality and increasing the range of seismic signal reception.

[0034] 5. Overall, this hydrophone is small and portable, making it more adaptable to special occasions for setup and operation, and solving the technical problems of high import costs and difficulties in importing small-diameter channels. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the present invention;

[0036] Figure 2 for Figure 1 Enlarged view of part I in the image;

[0037] Figure 3 for Figure 2 Enlarged view of part II in the image;

[0038] Figure 4 for Figure 3 A magnified view of section III in the image.

[0039] In the figure: 1. Ultrasonic transducer; 11. Outer cylinder; 12. Piezoelectric ceramic; 13. Damping block; 14. Matching layer; 2. High-frequency cable; 3. Outer shell; 4. Sealing wire assembly; 41. Internal and external threaded sleeve; 42. Flexible sealing ring; 43. Hollow screw plug. Detailed Implementation

[0040] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0041] Example 1, in conjunction with Appendix Figures 1 to 4 An ultrasonic transducer hydrophone for use in single-channel seismic reflection wave method in water areas includes multiple ultrasonic transducers 1 arranged coaxially and spaced apart, and a high-frequency cable 2 that connects the multiple ultrasonic transducers 1 in parallel. In use, the high-frequency cable 2 is connected to the corresponding acquisition device.

[0042] Furthermore, the high-frequency cable 2 is connected to the acquisition device via an amplifier circuit.

[0043] Depending on the requirements, the number of ultrasonic transducers 1 is 2 to 4; the distance between adjacent ultrasonic transducers 1 is 0.3 to 0.7 m.

[0044] In this embodiment, as shown in Figure X, three ultrasonic transducers 1 are used, and the distance between two adjacent ultrasonic transducers 1 is 0.5m. This makes the total length of the hydrophone, excluding the high-frequency cable 2, slightly greater than 1m. Compared with the 6m and above imported from the United States, this hydrophone achieves a miniaturized design, which is more convenient for construction and can be well adapted to occasions with frequent bridges, ports, docks, and ships.

[0045] In other embodiments, the number of ultrasonic transducers 1 can be 2 or 4. The distance between two adjacent ultrasonic transducers 1 can have a certain error. That is, the distance between two adjacent ultrasonic transducers 1 only needs to be between 0.3 and 0.7 m.

[0046] In actual production, the length of this hydrophone is between 1.5 and 2 meters.

[0047] Furthermore, in conjunction with the appendix Figure 2 The ultrasonic transducer 1 includes an outer cylinder 11, a piezoelectric ceramic 12, a damping block 13, and a matching layer 14; specifically, the upper end of the outer cylinder 11 is open, which is used to fix and protect the piezoelectric ceramic 12, the damping block 13, and the matching layer 14.

[0048] The outer cylinder 11 may be made of plastic or metal, depending on the requirements.

[0049] Multiple piezoelectric ceramics 12 are stacked on top of each other and coaxially arranged in the inner cavity of the outer cylinder 11 for transmitting and receiving ultrasonic waves.

[0050] Depending on the need, the number of piezoelectric ceramics 12 is 3 or 4. In this embodiment, 3 piezoelectric ceramics 12 are used.

[0051] Furthermore, to increase the uniformity of the voltage of the piezoelectric ceramic 12, both the bottom and top surfaces of the piezoelectric ceramic 12 are coated with silver layers as electrodes; specifically, the silver layer electrode on the top surface of the ceramic sheet is connected to the positive electrode and led to the circuit, while the silver layer electrode on the bottom surface is connected to the negative electrode to form a differential signal loop.

[0052] Furthermore, the piezoelectric ceramic 12 has an inverted conical structure with an open top, which allows all the piezoelectric ceramics 12 to be stacked on top of each other, so that adjacent piezoelectric ceramics 12 can fit together tightly.

[0053] The damping block 13 is located in the inner cavity of the outer cylinder 11 above the piezoelectric ceramic 12. It is used to absorb and shield the interference above the piezoelectric ceramic 12 in order to reduce noise. Specifically, the damping block 13 is composed of several damping materials and is adhered to the piezoelectric ceramic 12.

[0054] The matching layer 14 is located inside the outer cylinder 11 below the piezoelectric ceramic 12. It is used to match the acoustic impedance in order to broaden the operating frequency band of the ultrasonic transducer 1, thereby improving the ultrasonic resolution and operating adaptability, and adjusting the receivable frequency range. Specifically, by adjusting the frequency that the piezoelectric ceramic 12 can respond to through the matching layer 14, the operating frequency of the ultrasonic transducer 1 can be reduced.

[0055] In the high-frequency cable 2, the positive wire is connected to the top surface of the uppermost piezoelectric ceramic 12, and the high-frequency cable 2 is connected to the bottom surface of the lowermost piezoelectric ceramic 12.

[0056] Overall, the ultrasonic transducer 1 has a bandwidth of 200Hz to 200000Hz, a sensitivity of <10 microvolts for receiving sound waves, and a dynamic range of approximately 78dB, capable of detecting a range of 0 to 133dB.

[0057] This hydrophone uses a combination of ultrasonic transducers 1 to merge the signals from multiple ultrasonic transducers 1 into a single signal, thereby enhancing the real seismic signal and suppressing noise, thus improving signal quality and increasing the range of seismic signal reception.

[0058] During assembly, the matching layer 14 is first installed into the bottom of the inner cavity of the outer cylinder 11, then the three piezoelectric ceramics 12 connected to the high-frequency cable 2 are stacked one on top of the other in the inner cavity of the outer cylinder 11, then the damping block 13 is pressed into the inner cavity of the outer cylinder 11, and finally sealed with adhesive.

[0059] Furthermore, in conjunction with the appendix Figure 1To fix the position of the ultrasonic transducer 1, an ultrasonic transducer hydrophone applied to the single-channel seismic reflection wave method in water also includes a housing 3 for fixing the position of the ultrasonic transducer 1. Specifically, one end of the housing 3 is provided with an opening for inserting a high-frequency cable 2, and the opening is provided with a sealing wire clamping assembly 4. The other end of the housing 3 is a tapered end. Multiple ultrasonic transducers 1 are coaxially spaced and installed inside the housing 3.

[0060] As required, the outer casing 3 is made of plastic.

[0061] As required, a limiting ring is provided in the inner cavity of the outer shell 3 between two adjacent ultrasonic transducers 1 to prevent the ultrasonic transducers 1 from shifting position. To reduce the weight of the limiting ring, the ring wall is designed with a hollow structure.

[0062] Furthermore, in conjunction with the appendix Figure 4 The sealing crimping assembly 4 includes:

[0063] The internal and external threaded sleeve 41 is fitted onto the body of the high-frequency cable 2 and is axially screwed to the inner wall of the opening. The lower section of the inner wall of the internal and external threaded sleeve 41 is provided with a reduced diameter section.

[0064] As needed, the inner end of the internal and external threaded sleeve 41 abuts against the corresponding ultrasonic transducer 1.

[0065] The flexible sealing ring 42 is sleeved on the body of the high-frequency cable 2 and is located in the inner cavity of the internal and external threaded sleeve 41.

[0066] Hollow screw plug 43 is fitted onto the body of high-frequency cable 2, and one end is screwed into the inner cavity of the inner and outer threaded sleeve 41 to facilitate the compression of flexible sealing ring 42.

[0067] This allows the hollow screw plug 43 to engage with the reduced diameter portion of the inner and outer threaded sleeve 41, compressing the flexible sealing ring 42 and causing it to deform, thereby ensuring a sealed fit between the high-frequency cable 2 and the inner and outer threaded sleeve 41.

[0068] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to encompass all changes falling within the meaning and scope of equivalents within this invention.

Claims

1. An ultrasonic transducer hydrophone for use in the single-channel seismic reflection wave method in water, characterized in that: include: An ultrasonic transducer (1) is provided with multiple transducers coaxially spaced, and the multiple ultrasonic transducers (1) are connected in parallel; a high-frequency cable (2) is connected at one end to the ultrasonic transducer (1) and at the other end to the acquisition device. The ultrasonic transducer (1) includes: an outer cylinder (11) with an open upper end; multiple piezoelectric ceramics (12) stacked vertically and coaxially disposed within the inner cavity of the outer cylinder (11) for transmitting and receiving ultrasonic waves; a damping block (13) disposed within the inner cavity of the outer cylinder (11) above the piezoelectric ceramics (12) for absorbing and shielding interference above the piezoelectric ceramics (12) to reduce noise; and a matching layer (14) disposed within the inner cavity of the outer cylinder (11) below the piezoelectric ceramics (12) for matching acoustic impedance to broaden the operating frequency band of the ultrasonic transducer (1). In the high-frequency cable (2), the positive electrode is connected to the top surface of the uppermost piezoelectric ceramic (12), and the high-frequency cable (2) is connected to the bottom surface of the lowermost piezoelectric ceramic (12).

2. The ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 1, characterized in that: The bottom and top surfaces of the piezoelectric ceramic (12) are coated with a silver layer.

3. The ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 1, characterized in that: Also includes: The housing (3) covers all the ultrasonic transducers (1) so that all the ultrasonic transducers (1) can be fixed in position; wherein, one end of the housing (3) is provided with an opening for the insertion of a high-frequency cable (2), and the opening is provided with a sealing wire clamping assembly (4).

4. An ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 3, characterized in that: The sealing and pressing assembly (4) includes: an inner and outer threaded sleeve (41), which is fitted onto the body of the high-frequency cable (2) and axially screwed into the inner wall of the opening, and the lower section of the inner wall of the inner and outer threaded sleeve (41) is provided with a reduced diameter part; a flexible sealing ring (42), which is fitted onto the body of the high-frequency cable (2) and is located in the inner cavity of the inner and outer threaded sleeve (41); and a hollow screw plug (43), which is fitted onto the body of the high-frequency cable (2) and one end is screwed into the inner cavity of the inner and outer threaded sleeve (41) to facilitate the compression of the flexible sealing ring (42).

5. An ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 3, characterized in that: The outer shell (3) has a tapered end away from the opening.

6. An ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 1, characterized in that: The distance between adjacent ultrasonic transducers (1) is 0.3~0.7m.

7. An ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 1, characterized in that: The number of ultrasonic transducers (1) is 2 to 4.

8. An ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 1, characterized in that: The number of piezoelectric ceramics (12) in each ultrasonic transducer (1) is 3 or 4.

9. An ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 1, characterized in that: The piezoelectric ceramic (12) has an inverted conical structure with an open top, so that all the piezoelectric ceramics (12) can be stacked on top of each other, so that adjacent piezoelectric ceramics (12) can fit together tightly.

10. An ultrasonic transducer hydrophone for single-channel seismic reflection wave method in water as described in claim 1, characterized in that: The high-frequency cable (2) is connected to the acquisition device via an amplifier circuit.

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