Portable calibration tool clamp for towed line array depth sensor

Abstract

The utility model relates to a towed line array depth sensor portable calibration work fixture which comprises a fixture body, a connecting column is arranged at the lower end of the fixture body in a protruding mode, external threads matched with water permeable holes of a sensor installation framework to be calibrated are arranged on the peripheral face of the connecting column, and the connecting column is of a hollow structure. The side face of the clamp body is further provided with a connecting screw hole connected and matched with an external air pressure valve, the connecting screw hole communicates with the connecting column through an air channel, and the air channel is located in the clamp body. According to the calibration tool clamp, through the miniaturized structural design, on the premise that the calibration precision is guaranteed, depth calibration work can be rapidly and efficiently completed by a single person.

Description

Technical field:

[0001] The utility model relates to the technical field of pressure sensing, in particular to a portable calibration fixture for a towed array depth sensor. Background technology:

[0002] The detection of underwater targets at equal depths is an effective way to give full play to the effectiveness of sonar. The detection array of towed linear array sonar is usually designed with zero buoyancy. By configuring a certain length of gravity tow cable, releasing it to the set depth, the hydrodynamic balance of the detection cable array is achieved under the combined action of cable gravity, cable buoyancy, cable flow resistance, array flow resistance and other forces, so as to achieve the effect of horizontal and stable towing at a certain depth underwater and search for underwater target signals. Therefore, high requirements are placed on the accuracy of the depth sensor.

[0003] The traditional method of calibrating towed array depth sensors requires placing the entire array into a water pressure tank, and the sensor signals are led out from the top of the pressure tank through a watertight composite cable, and the sensor is numerically calibrated by gradually increasing the pressure. This method requires a large amount of engineering, a lot of manpower, and a long preparation and operation time. Utility model content:

[0004] The technical problem to be solved by the utility model is to provide a portable calibration fixture for a towed array depth sensor. Through a miniaturized structural design, the depth calibration work can be completed quickly and efficiently by a single person while ensuring the calibration accuracy. For the calibration task of a large-scale array, the 1-2 days of work that originally required the assistance of large-scale engineering equipment can be completed within half a day, and the work efficiency can be improved by more than 50%, while saving the task cost to a certain extent. This design is of great significance to ensuring the engineering realization of towed array sonar in deep-sea exploration.

[0005] The technical solution of the utility model is to provide a portable calibration fixture for a towed array depth sensor, including a fixture body, a connecting column protruding from the lower end of the fixture body, an outer peripheral surface of the connecting column is provided with an external thread adapted to the water-permeable hole of the sensor mounting frame to be calibrated, the connecting column is a hollow structure, and a connecting screw hole for connecting and cooperating with an external air pressure valve is also provided on the side of the fixture body, the connecting screw hole is connected to the connecting column through an air duct, and the air duct is located in the fixture body.

[0006] Through miniaturized structural design, the depth calibration work can be completed quickly and efficiently by one person while ensuring the calibration accuracy. For the calibration task of large-scale arrays, the workload of 1-2 days that originally required the assistance of large-scale engineering equipment can be completed in half a day, which improves the work efficiency by more than 50% and saves the task cost to a certain extent. This design is of great significance to the engineering realization of towed line array sonar in deep-sea exploration.

[0007] Preferably, the clamp body is further provided with a sealing ring installation groove, which is located outside the connection between the connecting column and the clamp body. The sealing ring is installed in the sealing ring installation groove.

[0008] Preferably, the connecting column and the clamp body are integrally formed.

[0009] The connecting column and the fixture body are made of TC4 titanium alloy. The fixture body and the connecting column have a tensile strength of not less than 895MPa and a specified residual elongation stress of not less than 830MPa, which meets the use scenario of the fiber optic towed array depth sensor generally not exceeding 5MPa water depth.

[0010] Preferably, the fixture body is a cubic structure, the edge length of the cube does not exceed 20 mm, and the height and diameter of the connecting column do not exceed 10 mm.

[0011] The material density of the clamp body and the connecting column of the utility model is about 4.51g / cm 3 , its overall mass does not exceed 50g.

[0012] Preferably, the connecting screw hole is connected to an external pressure ball valve, which is connected to an air pressure pump through an air pressure pipe, and a pressure gauge is also connected to the pressure pipe. Air pressure can be added to the sensor frame from the outside to pressurize the sensor, and calibration is achieved by comparing the sensor value with the external pressure gauge value.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model has a simple structure, light weight, small size, and is not limited by environmental space factors. As long as the clamp is provided with air pressure within the range of the depth sensor, the depth value calibration can be carried out in any place. This type of depth calibration fixture can be applied to various towed linear arrays of different diameters, and can also be used to install similar depth sensor frames. Description of the drawings:

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a cross-sectional view of the utility model.

[0017] Figure 3 It is a schematic diagram of the calibration method of the utility model.

[0018] Figure 4 These are the calibration and fitting results of the embodiment of the present utility model.

[0019] In the figure: 1. Clamp body; 2. Connecting column; 3. Connecting screw hole; 4. Air duct; 5. Sealing ring mounting groove; 6. Pressure ball valve; 7. Air pressure pump; 8. Pressure gauge; 9. Depth sensor frame; 10. Depth sensor end face. Specific implementation method:

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Reference Figure 1-3 The utility model discloses a portable calibration fixture for a towed array depth sensor, including a fixture body 1, a connecting column 2 protruding from the lower end of the fixture body 1, an outer peripheral surface of the connecting column 2 is provided with an external thread adapted to a water-permeable hole of a sensor mounting frame to be calibrated, the connecting column 2 is a hollow structure, and a connecting screw hole 3 for connecting and cooperating with an external air pressure valve is further provided on one side of the fixture body 1, the connecting screw hole 3 is connected to the connecting column 2 through an air duct 4, and the air duct 4 is located in the fixture body 1.

[0022] In order to improve the connection sealing performance when the clamp is in use, a sealing ring installation groove 5 is further provided on the clamp body 1 . The sealing ring installation groove 5 is located outside the connection between the connecting column 2 and the clamp body 1 .

[0023] In this embodiment, the air channel 4 includes two sections, one section is horizontally arranged and connected to the connecting screw hole 3, and the other section is vertically arranged, and the two ends are respectively connected to the connecting column 2 and the inner end of the horizontally arranged air channel. The connecting column 2 and the clamp body 1 are integrally formed of TC4 titanium alloy, so that the structure has a tensile strength of not less than 895MPa and a specified residual elongation stress of not less than 830MPa, which meets the use scenario of the optical fiber towed array depth sensor generally not exceeding 5MPa water depth.

[0024] As an embodiment, the fixture body 1 is a cubic structure, the cube edge length is 18mm, the connecting column 2 is 8mm high and 6mm in diameter. In addition, in order to facilitate connection observation, a truncated cone-shaped connecting platform is provided below the fixture body 1, and its diameter is larger than that of the connecting column. Similarly, the airway passes through the connecting platform and is connected to the connecting column.

[0025] When in use, the screw hole 3 is connected to an external pressure ball valve 6, and the pressure ball valve 6 is connected to the air pressure pipe and the air pressure pump 7. The pressure pipe is also connected to a pressure gauge 8. When the connecting column 2 is docked with the depth sensor skeleton 9, the air pressure is injected into the system through the air pressure pump and acts on the end face 10 of the depth sensor to carry out depth sensor calibration.

[0026] The specific usage of this new type is as follows:

[0027] (1) Connect the connection column 2 of the calibration fixture to the water-permeable hole of the sensor mounting frame 9 and tighten them;

[0028] (2) Install the pressure ball valve 6 on the connecting screw hole 3 of the calibration fixture;

[0029] (3) Install the air pressure pipe at the other end of the pressure ball valve 6;

[0030] (4) Connect the test dry end device to the array sensor data port;

[0031] (5) Turn on the air pressure pump 7, adjust the air pressure to 0 MPa through the pressure gauge 8, and record the pressure value of the depth sensor at this time through the test software or program;

[0032] (6) Pressurize in increments of 0.2 MPa, maintain pressure for 1-2 minutes after each pressurization, read and record the sensor data at the corresponding pressure;

[0033] (7) Compare the recorded measured value with the calibration value, draw a linear function graph and perform linear fitting, and save the fitting result to the detection system terminal.

[0034] The developed calibration fixture is used to calibrate the depth sensor data of a certain type of fiber optic towed linear array. The calibration results are shown in Table 1 below.

[0035] Table 1 Depth sensor calibration results

[0036]

[0037] The fitting curve of the calibration result ( Figure 4 ), the R value is 0.99987, the slope is 0.99681, and the intercept is 0.65704. The above results verify that the calibration of the depth sensor of the utility model is operable, efficient and accurate, and can do this job well.

[0038] 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 portable calibration fixture for a towed array depth sensor, characterized in that: It includes a clamp body, a connecting column protruding from the lower end of the clamp body, an outer peripheral surface of the connecting column is provided with an external thread adapted to the water-permeable hole of the sensor mounting frame to be calibrated, the connecting column is a hollow structure, and a connecting screw hole for connecting and cooperating with an external air pressure valve is also provided on the side of the clamp body, the connecting screw hole is connected to the connecting column through an air channel, and the air channel is located in the clamp body.

2. The portable calibration fixture for towed array depth sensor according to claim 1 is characterized by: A sealing ring installation groove is also provided on the clamp body, and the sealing ring installation groove is located outside the connection between the connecting column and the clamp body.

3. The portable calibration fixture for towed array depth sensor according to claim 1 is characterized by: The connecting column and the clamp body are integrally formed.

4. The portable calibration fixture for towed array depth sensor according to claim 3 is characterized by: The connecting column and the clamp body are made of TC4 titanium alloy.

5. The portable calibration fixture for towed array depth sensor according to claim 4 is characterized by: The clamp body and the connecting column have a tensile strength of not less than 895MPa and a specified residual elongation stress of not less than 830MPa.

6. The portable calibration fixture for towed array depth sensor according to claim 3 is characterized by: The fixture body is a cubic structure, the edge length of the cube does not exceed 20mm, and the height and diameter of the connecting column do not exceed 10mm.

7. The portable calibration fixture for towed array depth sensor according to claim 1, characterized in that: The connecting screw hole is externally connected to a pressure ball valve, the pressure ball valve is connected to the air pressure pump through an air pressure pipe, and a pressure gauge is also connected to the pressure pipe.

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