Portable transducer impedance characteristic test tool

Abstract

The invention belongs to the technical field of underwater acoustic transducers, and particularly relates to a portable transducer impedance characteristic testing tool. Comprising a shell, the top of which is open; the sound transmission layer is arranged at the top of the shell; the sound absorption layer is arranged on the inner wall of the shell; and the coupling liquid is filled in the inner cavity of the shell. The sound absorption material is installed in the test tool, when the frequency of a tested object is within the effective sound absorption frequency band of the sound absorption material, sound waves can be well absorbed in the cavity of the tool, the intensity of reflection echoes is small, the absorption effect of an anechoic pool on the sound waves can be approximately simulated, and the approximate test of the impedance characteristic of the tested object in water is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater acoustic transducers, and in particular relates to a portable transducer impedance characteristic testing tool. Background Art

[0002] When developing, producing and testing underwater acoustic transducers, it is often necessary to test the impedance characteristics of the transducer in water to analyze and judge the transducer's performance, consistency, damage, etc. The impedance characteristics of the transducer in water generally need to be tested in an anechoic pool, but the construction cost of an anechoic pool is very high and it is inconvenient or immovable. When encountering field debugging, the test product cannot be moved, and it cannot be put into the water, etc., it is difficult to test the impedance characteristics of the transducer in water. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art. The present invention provides a portable transducer impedance characteristic test tool, which can approximately simulate the acoustic radiation environment of the transducer in the anechoic pool, and assist in the impedance characteristic test of the transducer in water. The test tool has the advantages of small size, light weight, easy to move and carry, and is very practical in the face of field debugging, when the tested product cannot be moved, cannot be put into the water, and other working scenarios, and can help users test and judge the state of the transducer.

[0004] In order to solve the above technical problems, the present invention provides a portable transducer impedance characteristic testing tool, comprising:

[0005] The shell is open at the top;

[0006] A sound-transmitting layer, disposed on the top of the shell;

[0007] A sound absorbing layer is arranged on the inner wall of the shell;

[0008] The coupling liquid is filled in the inner cavity of the shell.

[0009] Preferably, the shell is made of corrosion-resistant metal or non-metal material; the coupling liquid includes one of fresh water, sea water and silicone oil; the sound-transmitting layer is made of sound-transmitting material, including one of polyurethane and rubber material.

[0010] Preferably, the sound-transmitting layer is made of a material having acoustic impedance characteristics close to that of the external medium when the object under test is working, and the thickness is preferably an odd multiple of 1 / 4 wavelength of the target frequency.

[0011] Preferably, the sound-transmitting layer is in a plane, a curved surface or other special shapes.

[0012] Preferably, the sound absorbing layer includes a bottom sound absorbing layer and a side sound absorbing layer; the bottom sound absorbing layer is located at the bottom of the inner cavity of the shell, the side sound absorbing layer is located on the inner wall of the shell, and the bottom sound absorbing layer and the side sound absorbing layer are both made of sound absorbing material.

[0013] Preferably, the shape of the sound absorbing layer is a plane shape or a pointed shape; and the thickness, sound absorption frequency band and sound absorption coefficient of the sound absorbing material can be adjusted and replaced according to own needs.

[0014] Preferably, the thickness of the bottom sound absorbing layer is greater than the thickness of the side sound absorbing layer.

[0015] Preferably, it also includes a pressure-stabilizing valve, and the bottom of the shell is provided with the pressure-stabilizing valve to ensure the internal pressure balance of the tooling when the external environment temperature changes.

[0016] Preferably, it also includes a liquid injection hole, which is provided at the bottom of the shell and is used to fill or replace the coupling liquid in the tooling, and is simultaneously sealed by tightening a sealing plug.

[0017] Preferably, it further comprises an elastic base, wherein the elastic base is connected to the bottom of the shell through an elastic member; the elastic member is made of a spring or other elastic materials.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] When the present invention is used, the tooling is attached to the surface of the object to be tested, and the contact surface is coated with coupling liquid or coupling grease to assist acoustic coupling. The electrodes of the transducer to be tested are connected to the impedance analyzer, and the impedance characteristics of the object to be tested in water can be tested. Sound-absorbing materials are installed in the test tooling. When the frequency of the object to be tested is within the effective sound absorption frequency band of the sound-absorbing material, the sound waves can be well absorbed in the tooling cavity, and the intensity of the reflected echo is small, which can approximately simulate the absorption effect of the anechoic pool on the sound waves, and realize the approximate test of the impedance characteristics of the object to be tested in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a structural diagram of a portable transducer impedance characteristic testing tool.

[0021] In the figure: 1-sound-transmitting layer, 2-coupling liquid, 3-shell, 4-side sound-absorbing layer, 5-bottom sound-absorbing layer, 6-pressure-stabilizing valve, 7-liquid injection hole, 8-elastic base. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0023] like Figure 1 As shown, the test tool provided by the embodiment of the present invention is composed of a shell 3, a sound-transmitting layer 1, a coupling liquid 2, a bottom sound-absorbing layer 5, a side sound-absorbing layer 4, an elastic base 8, a pressure-stabilizing valve 6, a liquid injection hole 7, etc.

[0024] The housing 3 is made of metal or non-metal material, and the material itself should be able to prevent corrosion by the coupling fluid 2. The shape and size of the housing 3 can be changed according to the use environment.

[0025] The sound-transmitting layer 1 is made of sound-transmitting materials, including but not limited to polyurethane, rubber and other materials. Preferably, the material has acoustic impedance characteristics close to those of the external medium when the object under test is working. The thickness is preferably an odd multiple of 1 / 4 wavelength of the target frequency to ensure the best sound transmission effect. The shape of the sound-transmitting layer 1 can be flat, curved or irregular, and can be changed according to actual needs.

[0026] The coupling fluid 2 includes but is not limited to fresh water, sea water, silicone oil, etc., and can be replaced depending on the use environment. For example, water may solidify when facing extremely low temperatures outdoors, but silicone oil will not solidify.

[0027] The bottom sound absorbing layer 5 and the side sound absorbing layer 4 are made of sound absorbing materials. The shape of the sound absorbing layer is not limited, and generally has a flat shape or a pointed shape. The thickness, sound absorption frequency band and sound absorption coefficient of the sound absorbing material can be adjusted and replaced according to their own needs. For the finished test tooling, it should be used within the effective sound absorption frequency band of the sound absorbing material as much as possible. Exceeding the effective sound absorption frequency band may cause large test errors or inaccuracies.

[0028] The elastic base 8 is connected to the shell. The base material is not limited. The connection is made of springs or other elastic materials. When in use, it can exert a force on the surface of the transducer under test and the sound-transmitting layer 1 of the tooling. The magnitude of the force is determined by the spring stiffness and compression amount, and can be adjusted by itself to ensure that the contact surface maintains good acoustic coupling.

[0029] The pressure regulating valve 6 can ensure the internal pressure balance of the tooling when the external environment temperature changes, and avoid the internal solid and liquid expansion or contraction at high or low temperatures, which may bring safety hazards or affect the service life.

[0030] The injection hole 7 is used to fill or replace the coupling liquid 2 in the tooling, and is sealed by tightening the sealing plug when in use.

[0031] It also includes the following usage process:

[0032] When in use, stick the tooling to the surface of the object to be tested, and apply coupling liquid 2 or coupling grease to the contact surface to assist acoustic coupling. Connect the transducer electrode to the impedance analyzer to test the impedance characteristics of the object under test in water. Sound-absorbing materials are installed in the test tooling. When the frequency of the object under test is within the effective sound absorption frequency band of the sound-absorbing material, the sound waves can be well absorbed in the tooling cavity, and the reflected echo intensity is small, which can approximately simulate the absorption effect of the anechoic pool on the sound waves, and realize the approximate test of the impedance characteristics of the object under test in water.

[0033] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A portable transducer impedance characteristic test tool, characterized in that: include: The shell is open at the top; A sound-transmitting layer, disposed on the top of the shell; A sound absorbing layer is arranged on the inner wall of the shell; The coupling liquid is filled in the inner cavity of the shell.

2. A portable transducer impedance characteristic testing tool as claimed in claim 1, characterized in that: The shell is made of corrosion-resistant metal or non-metal material; the coupling liquid includes one of fresh water, sea water and silicone oil; the sound-transmitting layer is made of sound-transmitting material, including one of polyurethane and rubber material.

3. A portable transducer impedance characteristic testing tool as claimed in claim 2, characterized in that: The sound-transmitting layer is preferably made of a material with acoustic impedance characteristics close to that of the external medium when the object being measured is working, and the thickness is preferably an odd multiple of 1 / 4 wavelength of the target frequency.

4. A portable transducer impedance characteristic testing tool as claimed in claim 2, characterized in that: The sound-transmitting layer is in the shape of a plane or a curved surface.

5. A portable transducer impedance characteristic testing tool as claimed in claim 1, characterized in that: The sound absorbing layer comprises a bottom sound absorbing layer and a side sound absorbing layer; the bottom sound absorbing layer is located at the bottom of the inner cavity of the shell, the side sound absorbing layer is located on the inner side wall of the shell, and the bottom sound absorbing layer and the side sound absorbing layer are both made of sound absorbing material.

6. A portable transducer impedance characteristic testing tool as claimed in claim 5, characterized in that: The shape of the sound absorbing layer is a plane shape or a pointed shape; and the thickness, sound absorption frequency band and sound absorption coefficient of the sound absorbing material can be adjusted and replaced according to own needs.

7. A portable transducer impedance characteristic testing tool as claimed in claim 6, characterized in that: The thickness of the bottom sound absorbing layer is greater than the thickness of the side sound absorbing layer.

8. The portable transducer impedance characteristic testing tool as claimed in claim 1, characterized in that: It also includes a pressure-stabilizing valve, which is arranged at the bottom of the shell to ensure that the internal pressure of the tooling is balanced when the external environment temperature changes.

9. A portable transducer impedance characteristic testing tool as claimed in claim 1, characterized in that: It also includes a liquid injection hole, which is provided at the bottom of the shell and is used to fill or replace the coupling liquid in the tooling, and is sealed by tightening a sealing plug.

10. A portable transducer impedance characteristic testing tool as claimed in any one of claims 1 to 9, characterized in that: It also includes an elastic base, which is connected to the bottom of the shell through an elastic member; the elastic member is made of a spring or other elastic materials.

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