Portable hydrophone calibrator structure

Abstract

The invention discloses a portable hydrophone calibrator structure, which is used for measuring sensitivity parameters of a hydrophone and comprises a piston sounder, a joint, a calibration cavity, an adapter, a locking nut, a measured hydrophone, a support, a joint sealing ring, a microphone, a microphone sealing ring, an adapter sealing ring and a locking nut sealing ring, a joint sealing ring is arranged in a sealing groove at the right end, and then the left end of the calibration cavity is sleeved; the adapter is sleeved on the rubber layer portion of the detected hydrophone, the adapter sealing ring is installed in the sealing groove on the left side of the adapter, the locking nut sealing ring is installed in the sealing groove on the left side of the locking nut, and then the adapter and the locking nut are connected through a thread structure of the adapter and the locking nut. The adapter, the locking nut, the detected hydrophone and the sealing ring which are assembled are sleeved on the right side of the calibration cavity together. The device is high in measurement precision, small in size, light in weight, convenient to carry, install and operate, high in measurement efficiency and suitable for on-site sensitivity calibration of the external field hydrophone.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater acoustic equipment measurement, and particularly relates to a structure of a portable hydrophone calibrator. Background Art

[0002] The traditional hydrophone sensitivity calibration device has a complex system composition, high price, and is inconvenient to carry. Especially when it comes to field measurement, the traditional measurement devices and methods cannot be used. Summary of the Invention

[0003] Aiming at the deficiencies and defects of the above-mentioned prior art, the invention provides a structure of a portable hydrophone calibrator, which has the advantages of high measurement accuracy, small volume, light weight, convenient to carry, install and operate, and high measurement efficiency, and is suitable for on-site sensitivity calibration of field hydrophones.

[0004] In order to solve the above technical problems, the invention provides the following technical solution: A structure of a portable hydrophone calibrator for measuring the sensitivity parameters of a hydrophone, including a piston sound generator, a joint, a calibration chamber, an adapter, a locking nut, a hydrophone under test, a support, a joint seal ring, a microphone, a microphone seal ring, an adapter seal ring, and a locking nut seal ring.

[0005] The left end of the joint is screwed into the piston sound generator, the joint seal ring is installed in the sealing groove at the right end, and then the left end of the calibration chamber is sleeved.

[0006] The adapter is sleeved on the rubber layer part of the hydrophone under test. The adapter seal ring is installed in the left sealing groove of the adapter, the locking nut seal ring is installed in the left sealing groove of the locking nut, and the adapter and the locking nut are connected by their own threaded structures. The assembled adapter, locking nut, hydrophone under test and seal rings are sleeved into the right side of the calibration chamber together.

[0007] The microphone seal ring is installed in the sealing groove at the boss of the calibration chamber, and the lower end of the microphone is screwed into the threaded hole at the boss of the calibration chamber.

[0008] The above-mentioned assembled overall components are installed on the support to obtain the complete structure of the portable hydrophone calibrator.

[0009] Preferably, the piston sound generator is the core component of the hydrophone calibrator, which can emit high-intensity and high-stability sound signals.

[0010] Preferably, the joint is a transfer piece, processed from stainless steel. One end of it is connected to the piston sound generator, and the other end is connected to the calibration chamber. The inner diameter of the joint is the same as the inner diameter of the emission end of the piston sound generator. Two sealing grooves are processed inside the right end of the joint for installing the joint seal ring, which can ensure the seal between the joint and the calibration chamber.

[0011] Preferably, the calibration cavity refers to a small cavity that can acoustically couple the piston generator and the hydrophone under test. The boundary of the calibration cavity is a rigid wall, that is, the boundary has a very high acoustic impedance. It is processed from stainless steel material. The thickness of the cavity wall is approximately equal to half of the cavity inner diameter. The maximum linear dimension in the cavity is smaller than the wavelength of the acoustic wave in the cavity medium.

[0012] Preferably, the maximum linear dimension in the standard cavity is not greater than one-tenth of the wavelength of the acoustic wave in the cavity medium. A boss is processed on the top of the calibration cavity for installing a microphone. If a microphone is not used, a plug can be used for sealing.

[0013] Preferably, the adapter is used to realize the sealing between the calibration cavity and the hydrophone under test, so that the internal sound pressure of the calibration cavity does not leak. The adapter is divided into two halves in the middle, that is, the HALF structure. Its material is engineering plastic. There is a sealing groove at the left end. The adapter sealing ring is assembled in the sealing groove to ensure the sealing between the calibration cavity and the adapter. An external thread is processed at the middle position of the adapter, which is matched with the internal thread on the locking nut, so that the adapter can be formed into a whole from the two-half structure and ensure the tight fit between the adapter and the rubber layer of the hydrophone under test, playing a sealing role.

[0014] Preferably, the left end of the locking nut is processed with an internal thread, which is matched with the external thread on the adapter. A sealing groove is processed at the middle position, and a locking nut sealing ring is installed in the sealing groove to ensure the sealing between the calibration cavity and the locking nut. Knurling is processed on the outer cylindrical surface at the right end of the locking nut.

[0015] Preferably, the support is provided with a prevention groove for placing the piston generator and the calibration cavity, and a handle hole is processed on the support. The material of the support is high-strength engineering plastic.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention has the advantages of high measurement accuracy, small volume, light weight, convenient to carry, install and operate, and high measurement efficiency, and is suitable for on-site sensitivity calibration of hydrophones in the field. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic cross-sectional view of the present invention;

[0019] Figure 3 is a front view schematic diagram of the present invention;

[0020] Figure 4 is a top view schematic diagram of the present invention

[0021] Wherein: 1. Piston sound generator; 2. Connector; 3. Calibration cavity; 4. Adapter; 5. Locking nut; 6. Hydrophone under test; 7. Support; 8. Connector sealing ring; 9. Microphone; 10. Microphone sealing ring; 11. Adapter sealing ring; 12. Locking nut sealing ring. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1

[0024] As Figures 1-4 shown, a portable hydrophone calibrator structure, mainly used for measuring the sensitivity parameters of a hydrophone, is composed of components such as a piston sound generator 1, a connector 2, a calibration cavity 3, an adapter 4, a locking nut 5, a hydrophone under test 6, a support 7, a connector sealing ring 8, a microphone 9, a microphone sealing ring 10, an adapter sealing ring 11, and a locking nut sealing ring 12.

[0025] First, screw the left end of the connector 2 into the piston sound generator 1, install the connector sealing ring 8 in the sealing groove at the right end, and then sleeved it on the left end of the calibration cavity 3.

[0026] Put the adapter 4 on the rubber layer part of the hydrophone under test 6, install the adapter sealing ring 11 in the left sealing groove of the adapter 4, then install the locking nut sealing ring 12 into the left sealing groove of the locking nut 5, then connect the adapter 4 and the locking nut 5 with their own threaded structures, and finally sleeve the assembled adapter 4, locking nut 5, hydrophone under test 6 and the sealing ring together onto the right side of the calibration cavity 3.

[0027] Install the microphone sealing ring 10 into the sealing groove at the boss of the calibration cavity 3, and then screw the lower end of the microphone 9 into the threaded hole at the boss of the calibration cavity 3.

[0028] Finally, place the installed overall component on the support 7 to complete the installation of the portable hydrophone calibrator structure.

[0029] The working principle of the structure of this portable hydrophone calibrator is as follows: A piston sound generator emits high-intensity and high-stability sound waves to form a uniform and stable sound pressure field inside the calibration cavity. Both the hydrophone under test and the microphone are located inside the calibration cavity and are subjected to the same sound pressure. By collecting the open-circuit voltages of the microphone and the hydrophone under test, the sound pressure sensitivity of the hydrophone under test can be obtained, which is also equal to the free-field sensitivity at low frequencies. Since the microphone has good stability, the measurement uncertainty is small.

[0030] Embodiment 2

[0031] The piston sound generator 1 is the core component of the hydrophone calibrator and needs to be able to emit high-intensity and high-stability sound signals.

[0032] The joint 2, as an adapter, is made of stainless steel. One end is connected to the piston sound generator 1, and the other end is connected to the calibration cavity 3. The inner diameter of the joint 2 is the same as the inner diameter of the emitting end of the piston sound generator 1. Two sealing grooves are machined inside the right end of the joint 2 for installing the joint sealing ring 8, which can ensure the seal between the joint 2 and the calibration cavity 3.

[0033] The calibration cavity 3 refers to a small cavity that can acoustically couple the piston sound generator 1 with the hydrophone under test. The calibration cavity 3 requires the boundary of the cavity to be a rigid wall, that is, the boundary has a very high acoustic impedance. Therefore, the calibration cavity 3 is made of stainless steel. The thickness of the cavity wall is approximately equal to half of the inner diameter of the cavity. The maximum linear dimension inside the cavity is much smaller than the wavelength of the sound wave in the cavity medium. Usually, it is required that the size inside the cavity is not greater than one-tenth of the wavelength. A boss is machined on the top of the calibration cavity 3 for installing the microphone 9. If the microphone 9 is not used, a plug can be used for sealing.

[0034] The function of the adapter 4 is to achieve the seal between the calibration cavity 3 and the hydrophone under test 6, so that the internal sound pressure of the calibration cavity 3 does not leak. For the convenience of installation, the adapter 4 is divided into two halves in the middle, that is, the HALF structure, and the material is engineering plastic. There is a sealing groove at the left end, and the adapter sealing ring 11 is assembled in the sealing groove to ensure the seal between the calibration cavity 3 and the adapter 4. An external thread is machined at the middle position of the adapter 4, which is matched with the internal thread on the locking nut 5, so that the adapter 4 can be formed into a whole from the two-half structure and ensure the tight fit between the adapter 4 and the rubber layer of the hydrophone under test 6, playing a sealing role.

[0035] The left end of the locking nut 5 is machined with an internal thread, which is matched with the external thread on the adapter 4. A sealing groove is machined at the middle position, and the locking nut sealing ring 12 is installed in the sealing groove to ensure the seal between the calibration cavity 3 and the locking nut 5. For the convenience of operation, knurling is machined on the outer cylindrical surface at the right end of the locking nut 5.

[0036] In order to make the portable hydrophone calibrator placed stably, a support 7 is machined in combination with the outer dimensions of the piston sound generator 1 and the calibration cavity 3. For the convenience of movement, a handle hole is machined on it, and the material is made of high-strength engineering plastic.

[0037] Although the specific embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these specific embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable hydrophone calibrator structure for measuring the sensitivity parameters of a hydrophone, characterized in that, It includes a piston sound generator (1), a joint (2), a calibration cavity (3), an adapter (4), a lock nut (5), a hydrophone under test (6), a support (7), a joint sealing ring (8), a microphone (9), a microphone sealing ring (10), an adapter sealing ring (11), and a lock nut sealing ring (12). The left end of the joint (2) is screwed into the piston sound generator (1). The joint sealing ring (8) is installed in the sealing groove at the right end, and then the left end of the calibration cavity (3) is sleeved. The adapter (4) is sleeved on the rubber layer part of the hydrophone under test (6). The adapter sealing ring (11) is installed in the left sealing groove of the adapter (4). The lock nut sealing ring (12) is installed in the left sealing groove of the lock nut (5). The adapter (4) and the lock nut (5) are connected by their own thread structure. The assembled adapter (4), lock nut (5), hydrophone under test (6), and sealing rings are sleeved into the right side of the calibration cavity (3) together. The microphone sealing ring (10) is installed in the sealing groove at the boss of the calibration cavity (3). The lower end of the microphone (9) is screwed into the threaded hole at the boss of the calibration cavity (3). The above assembled overall components are installed on the support (7) to obtain the complete structure of the portable hydrophone calibrator.

2. The structure of a portable hydrophone calibrator according to claim 1, wherein: The piston sound generator (1) is the core component of the hydrophone calibrator, which can emit high-intensity and high-stability sound signals.

3. The structure of a portable hydrophone calibrator according to claim 1, wherein: The joint (2) is a transfer piece, processed from stainless steel. One end of it is connected to the piston sound generator (1), and the other end is connected to the calibration cavity (3). The inner diameter of the joint (2) is the same as the inner diameter of the emission end of the piston sound generator (1). Two sealing grooves are processed inside the right end of the joint (2) for installing the joint sealing ring (8), which can ensure the seal between the joint (2) and the calibration cavity (3).

4. The structure of a portable hydrophone calibrator according to claim 1, wherein: The calibration cavity (3) refers to a small cavity that can acoustically couple the piston sound generator (1) and the hydrophone under test (6). The cavity boundary of the calibration cavity (3) is a rigid wall, that is, the boundary has a very high acoustic impedance. It is processed from stainless steel material. The thickness of the cavity wall is approximately equal to half of the cavity inner diameter. The maximum linear dimension inside the cavity is smaller than the wavelength of the acoustic wave in the cavity medium.

5. The structure of a portable hydrophone calibrator according to claim 4, characterized in that: The maximum linear dimension inside the cavity of the standard cavity (3) is not greater than one-tenth of the wavelength of the acoustic wave in the cavity medium. A boss is processed at the top of the calibration cavity (3) for installing the microphone (9). If the microphone (9) is not used, a plug can be used for sealing.

6. The structure of a portable hydrophone calibrator according to claim 1, wherein: The adapter (4) is used to achieve the seal between the calibration cavity (3) and the hydrophone under test (6), so that the internal sound pressure of the calibration cavity (3) does not leak. The adapter (4) is divided into two halves in the middle, that is, the HALF structure. Its material is engineering plastic. There is a sealing groove at the left end. The adapter sealing ring (11) is assembled in the sealing groove to ensure the seal between the calibration cavity (3) and the adapter (4). External threads are processed at the middle position of the adapter (4) to cooperate with the internal threads on the lock nut (5), which can make the adapter (4) form a whole from the two-half structure and ensure the tight fit between the adapter (4) and the rubber layer of the hydrophone under test (6), playing a sealing role.

7. The structure of a portable hydrophone calibrator according to claim 6, characterized in that: The left end of the lock nut (5) is machined with an internal thread, which is matched with the external thread on the adapter (4). A sealing groove is machined at the middle position, and a lock nut sealing ring (12) is installed in the sealing groove to ensure the seal between the calibration cavity 3 and the lock nut (5). Knurling is machined on the outer cylindrical surface at the right end of the lock nut (5).

8. A structure of a portable hydrophone calibrator according to claim 6, characterized in that: The support (7) is provided with a prevention groove for placing the piston sound generator (1) and the calibration cavity (3), and a handle hole is machined on the support (7). The material of the support (7) is made of high-strength engineering plastic.

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