Device for calibrating sensitivity of optical fiber hydrophone

Abstract

The utility model relates to a device for calibrating the sensitivity of an optical fiber hydrophone, which comprises a vertically arranged bracket, a horizontally arranged movable bracket movably connected with the bracket up and down, a first movable clamping fixture and a second movable clamping fixture capable of horizontally moving on the horizontal bracket, a shock insulation base and a sound barrel arranged on the shock insulation base, a tail cable of the standard hydrophone is connected with the first movable clamping clamp so that the standard hydrophone can be hung in the sound barrel, the hydrophone to be tested is hung in the sound barrel, the upper end of the hydrophone to be tested is connected with the lower end of the rigid optical unit, and the upper end of the optical unit is connected with the second movable clamping clamp. According to the device, accurate test data can be provided through fixation of the hydrophone; and meanwhile, a basis is provided for optical fiber array parameter design.

Description

Technical field:

[0001] The utility model relates to the technical field of optical fiber hydrophones, in particular to a device for calibrating the sensitivity of optical fiber hydrophones. Background technology:

[0002] Fiber optic hydrophone technology is a new underwater sound detection technology, which has developed along with the development of optical fiber and fiber optic device technology. Compared with traditional piezoelectric ceramic hydrophone technology, fiber optic hydrophone has the characteristics of high sensitivity, no impedance matching, inherent resistance to electromagnetic interference and arbitrary structure; fiber optic hydrophone array technology has the advantages of long transmission distance and wide transmission bandwidth. Therefore, with my country's vigorous development in the marine field and the rapid upgrading of naval equipment, the application scope of fiber optic arrays is becoming wider and wider.

[0003] The sensitivity of fiber optic hydrophones is generally measured by comparison. The basic principle is as follows: the fiber optic hydrophone to be tested and the standard hydrophone are placed in the same sound field for sound pressure testing, and the test results of the two are compared to obtain the sensitivity of the hydrophone. Due to the limitations of the original test device, it is difficult to ensure that the fiber optic hydrophone and the standard hydrophone are in the same position. In order to accurately measure the sensitivity of the fiber optic hydrophone, the hydrophone to be tested needs to be fixed next to the standard hydrophone to ensure that the two are in the same sound field of sound pressure, and then the sensitivity of the fiber optic hydrophone is tested. The sensitivity calibration of different fiber optic hydrophones can provide guidance for the control of test depth, the design of structural strength, and even the optimization of sensitivity consistency. However, there is a large error in the current fixing method of the sensitivity test of the fiber optic hydrophone, which causes the fiber optic hydrophone and the standard ball to be not in the same sound field, and there is a large deviation in the test; in addition, the installation of the fixing device is cumbersome and cannot be quickly positioned; and the positions of different fiber optic hydrophones to be tested are different, the sensitivity consistency is poor, and the test is inaccurate. In summary, the current fixing method cannot accurately calibrate the sensitivity data of the fiber optic hydrophone in the same sound field, and thus cannot accurately provide parameter basis for the fiber optic array. A new device for calibrating the sensitivity of the fiber optic hydrophone is urgently needed to solve the above technical problems. Utility model content:

[0004] The technical problem to be solved by the utility model is to provide a device for calibrating the sensitivity of an optical fiber hydrophone. The fixing device can not only provide accurate test data by fixing the hydrophone, but also provide a basis for the design of optical fiber array parameters.

[0005] The technical solution of the utility model is to provide a device for calibrating the sensitivity of an optical fiber hydrophone, comprising a vertically arranged bracket, a horizontally arranged movable bracket movably connected to the bracket up and down, a first movable clamping fixture and a second movable clamping fixture that can be horizontally moved on the horizontal bracket, a seismic isolation base and a sound barrel arranged on the seismic isolation base, and also comprising a standard hydrophone and a hydrophone to be tested, the standard hydrophone tail cable is connected to the first movable clamping fixture so that the standard hydrophone is suspended in the sound barrel, the hydrophone to be tested is suspended in the sound barrel, the upper end of the hydrophone to be tested is connected to the lower end of a rigid optical unit, the upper end of the optical unit is connected to the second movable clamping fixture, the pigtail of the hydrophone to be tested passes through the upper end of the optical unit upward along the lower end of the optical unit, and the outer surface of the optical unit is provided with scales along the axial direction.

[0006] The utility model fixes the optical unit with scales on the movable bracket through the movable clamping fixture, so as to realize the rapid positioning and fixing of the hydrophone to be tested, and the rigidly arranged optical unit can ensure that the hydrophone to be tested always keeps a vertical state at a certain depth, and will not float in the water due to the lightness of the optical fiber hydrophone. When the depth needs to be adjusted during the test, the depth can be adjusted by adjusting the upper and lower parts of the movable bracket, and the hydrophone to be tested will not slide or move as the whole moves up and down; at the same time, the scales on the optical unit can ensure that different hydrophones to be tested always keep in the same sound field position, so as to ensure the consistency of sensitivity of the same type of hydrophones; the design of the movable clamping fixture can realize the rapid fixing of the hydrophone to be tested.

[0007] Preferably, the optical unit is composed of a hydrophone adapter and a rigid hollow tube, and the top of the hydrophone adapter is threadedly connected to the bottom of the hollow tube, so as to realize quick connection and fixation and protect the pigtail of the hydrophone to be tested.

[0008] Preferably, the lower end of the hydrophone adapter is threadedly connected to the end cap of the hydrophone to be tested, so as to achieve quick connection and fixation and keep the two concentric.

[0009] Preferably, the hydrophone to be tested and the standard hydrophone are arranged at the acoustic center positions.

[0010] Preferably, the hollow tube is a stainless steel tube, and scales are etched on the stainless steel.

[0011] Preferably, the hollow tube is arranged vertically.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] By setting two movable clamps on the movable bracket and setting the scale on the optical unit, the depth of the sound field of the hydrophone to be tested can be adjusted to a certain extent, and the relative position of the standard hydrophone and the hydrophone to be tested does not change; the structural combination of the rigid hollow tube and the adapter is adopted to keep the hydrophone to be tested underwater in a vertical state at all times, which solves the problems of the hydrophone floating and inaccurate test position; with the aid of the scale on the hollow tube, the hydrophone can be quickly fixed, which solves the problem of the hydrophone to be tested and the standard hydrophone needing to be aligned with the center each time the test is tested, and the position deviation problem; the test speed of the hydrophone is improved. Description of the drawings:

[0014] Figure 1 This is a schematic diagram of the installation of the hydrophone and the optical unit of the utility model.

[0015] Figure 2 It is a schematic diagram of the use of the utility model.

[0016] In the figure: 1. hydrophone to be tested; 2. optical unit; 3. pigtail; 4. standard hydrophone; 5. sound barrel; 6. vibration isolation base; 7. bracket; 8. movable bracket; 9. first movable clamping fixture; 10. second movable clamping fixture; 11. pigtail cable; 21. hollow tube; 22. adapter. Specific implementation method:

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Reference Figure 1 , 2The utility model is a device for calibrating the sensitivity of an optical fiber hydrophone, comprising a vertically arranged bracket 7, a movable bracket 8 movably connected to the bracket 7, the movable bracket 8 being arranged horizontally, a first movable clamping fixture 9 and a second movable clamping fixture 10 which can be moved horizontally are slidably connected to the movable bracket 8, and can be positioned by corresponding fastening bolts after the sliding is completed, a vibration isolation base 6 and a sound barrel 5 arranged on the vibration isolation base 6 are also arranged below the movable bracket 8, and a standard hydrophone 4 and a hydrophone to be tested 1 are also included. The standard hydrophone 4 is suspended in the sound barrel 5, and the upper end of the tail cable 11 above it is clamped on the first movable clamping fixture 9. The hydrophone 1 to be tested is also suspended in the sound barrel 5, and the hydrophone 1 to be tested and the standard hydrophone 4 are both aligned with the sound center position. The upper end of the hydrophone 1 to be tested is connected to the lower end of the rigid optical unit 2, and the upper end of the optical unit 2 is connected to the second movable clamping fixture 10. Specifically, the optical unit 2 is composed of a hydrophone adapter 21 and a rigid hollow tube 22, wherein the top of the hydrophone adapter 21 is threadedly connected to the lower end of the hollow tube 22, and the lower end of the hydrophone adapter 21 is threadedly connected to the end cover of the hydrophone to be tested, and the pigtail 3 of the hydrophone 1 to be tested passes through the hydrophone adapter 21 and then goes upward along the lower end of the hollow tube 22 and passes through the upper end of the hollow tube 22. This structure can realize rapid connection and fixation, and protect the pigtail 3 of the hydrophone to be tested. At the same time, in order to facilitate the detection of subsequent hydrophones to be tested in the same batch after the first hydrophone 1 to be tested is detected, the outer surface of the hollow tube 22 is provided with scales along the axial direction, and the subsequent hydrophones to be tested 1 can be conveniently located by the scales.

[0019] It should be noted that the movable bracket 8 and the bracket 7 can be connected and limited by a slider and a tightening bolt by conventional means, and the movable clamping fixture is a conventional movable clamp in the field, which is not the innovation point of the present utility model.

[0020] In this embodiment, the hollow tube 22 is a stainless steel tube with scales etched on the stainless steel. The hollow tube 22 is vertically clamped on the second movable clamping fixture 10. Figure 1 The optical unit 2 is inserted into the inside, and the hydrophone adapter 21 is connected to the end cover of the hydrophone to be tested, so that the hydrophone 1 to be tested and the optical unit 2 are integrated, and the two are kept in a concentric state. Since the optical unit 2 is a rigid structure, the problem of the hydrophone 1 to be tested floating during sensitivity calibration and inaccurate test position is solved.

[0021] When in use: hang and fix the standard hydrophone 4 in the sound barrel 5, place the first hydrophone 1 to be tested connected to the optical unit 2 in the sound barrel 5 and align it with the sound center position of the standard hydrophone 4, fix the hydrophone 1 to be tested on the movable bracket 8 through the second movable clamping fixture 10, and record the scale value on the optical unit 2; afterwards, in the sensitivity test of the same batch of hydrophones 1 to be tested, it is only necessary to fix the hydrophone 1 to be tested with the optical unit 2 according to the first scale position, so that different hydrophones 1 to be tested in the same batch can maintain the same fixed position and accurate positioning, and then the calibration operation can be carried out.

[0022] The above is only an explanation of the preferred embodiments of the utility model, which cannot be understood as a limitation of the claims. Any equivalent structure or equivalent process changes made using the utility model specification are included in the patent protection scope of the utility model.

Claims

1. A device for calibrating the sensitivity of an optical fiber hydrophone, comprising a vertically arranged bracket, a horizontally arranged movable bracket movably connected to the bracket up and down, a first movable clamping fixture and a second movable clamping fixture that can be horizontally moved on the horizontal bracket, a vibration isolation base, and a sound barrel arranged on the vibration isolation base, characterized in that: It also includes a standard hydrophone and a hydrophone to be tested. The tail cable of the standard hydrophone is connected to the first movable clamping fixture so that the standard hydrophone is suspended in the sound barrel. The hydrophone to be tested is suspended in the sound barrel. The upper end of the hydrophone to be tested is connected to the lower end of the rigid optical unit. The upper end of the optical unit is connected to the second movable clamping fixture. The pigtail of the hydrophone to be tested runs upward along the lower end of the optical unit through the upper end of the optical unit. The outer surface of the optical unit is provided with scales along the axial direction.

2. The device for calibrating the sensitivity of a fiber optic hydrophone according to claim 1, characterized in that: The optical unit consists of a hydrophone adapter and a rigid hollow tube, and the top end of the hydrophone adapter is threadedly connected to the lower end of the hollow tube.

3. The device for calibrating the sensitivity of a fiber optic hydrophone according to claim 2, characterized in that: The lower end of the hydrophone adapter is threadedly connected to the end cover of the hydrophone to be tested.

4. The device for calibrating the sensitivity of a fiber optic hydrophone according to claim 1, characterized in that: The hydrophone to be tested and the standard hydrophone are aligned at the acoustic center.

5. The device for calibrating the sensitivity of a fiber optic hydrophone according to claim 2, characterized in that: The hollow tube is a stainless steel tube.

6. The device for calibrating the sensitivity of a fiber optic hydrophone according to claim 1, characterized in that: The hollow tube is arranged vertically.

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