Method for rapidly measuring phase consistency of hydrophone

Abstract

The invention relates to a hydrophone phase consistency rapid measurement method, which comprises the following steps of S1, fixing a measured hydrophone by adopting an arc butt joint clamp; s2, arranging a sound field; s3, setting a measurement system and a measurement signal; and S4, the signals received by the detected hydrophones are collected and processed, and the phase difference between the detected hydrophones is obtained. The device is used for solving the problem of rapid and accurate measurement of the phase consistency of the batch hydrophones in a laboratory pool environment, a plurality of hydrophones can be installed at a time, the disassembly and assembly time is greatly shortened, and the front and back positioning precision during batch time sequence testing is improved.

Description

Technical Field:

[0001] The present invention belongs to the technical field of hydrophone testing, and particularly relates to a method for quickly measuring the phase consistency of hydrophones. Background Art:

[0002] The passive receiving array of a sonar is composed of multiple receiving hydrophones arranged in a certain structure. By performing time delay or phase compensation processing on the signals received by the hydrophones, the passive receiving array can achieve different beam directions and gains. Therefore, the phase consistency between the receiving hydrophones becomes a key technical performance index. The conventional laboratory pool detection method is the single-frequency pulse sound measurement method, which is a detection mode for a single hydrophone or a single channel. The fixture uses a bolt fastening method, and the hydrophone under test needs to be frequently replaced. This detection mode has low efficiency, and frequent disassembly and assembly are likely to cause loosening of the fixture and deviation of the installation position, greatly increasing the uncertainty introduced by human factors during the phase consistency detection process. Moreover, when facing the detection requirements of a large number of array hydrophones, this method is obviously not practical. Therefore, there is an urgent need for a new method for quickly measuring the phase consistency of hydrophones to meet the detection requirements. Summary of the Invention:

[0003] The technical problem to be solved by the present invention is to provide a method for quickly measuring the phase consistency of hydrophones, which is used to solve the problem of quickly and accurately measuring the phase consistency of a large number of hydrophones in a laboratory pool environment. It can install multiple hydrophones at one time, greatly shortening the disassembly and assembly time and improving the front and back positioning accuracy during batch timing testing. In addition, the improved multi-frequency superposition pulse measurement method is adopted, which superimposes multiple detection frequencies into a custom pulse signal and combines it with a multi-channel automated detection system based on the PXI bus, greatly improving the detection work efficiency.

[0004] The technical solution of the present invention is to provide a method for quickly measuring the phase consistency of hydrophones, including the following steps:

[0005] S1, fixing the hydrophone under test with an arc docking fixture;

[0006] S2, arranging the sound field;

[0007] S3, setting the measurement system and the measurement signal;

[0008] S4, collecting and processing the signals received by the hydrophone under test to obtain the phase difference between the hydrophones under test;

[0009] Among them, in the step S1, the arc docking fixture is composed of an arc-shaped bracket, a docking pipe, and multiple groups of clamping components. The arc-shaped bracket includes a flange rod, a rib plate, and an arc-shaped frame for connecting with the pool lifting rod. Multiple circular holes are evenly arranged on the upper and lower cross beams of the arc-shaped frame, and the upper and lower circular holes in the same vertical plane are a group. The clamping component includes a fixed collar, a limit support rod, a cross bar, and a clamp. The clamp is a quick-release structure composed of an upper clamp block, a lower clamp block, a lock, and a pin, which realizes the circumferential fixation of the hydrophone to be measured.

[0010] Preferably, the arc docking fixture has five groups of clamping components. The lengths of the five groups of clamping components are the same, and the centers of the clamps in a row at the lower end or the upper end of the five groups of clamping components are on the same arc surface.

[0011] Preferably, in the step S2, the requirement for the sound field layout is that the horizontal distance between the auxiliary transmitting transducer and the hydrophone to be measured is equal to the radius of the arc-shaped frame of the arc docking fixture.

[0012] Preferably, in the step S3, the set information includes the impedance matching file of the measurement system. Select one output of the hydrophone to be measured as the reference benchmark, and set the frequency, amplitude, initial phase, pulse width, and period of the superimposed test signal. The multi-frequency superimposed pulse signal is obtained:

[0013]

[0014] where i is the number of detection frequency points, f i is the i-th frequency, A i is the amplitude corresponding to the i-th frequency, is the initial phase corresponding to the i-th frequency, and t is the time sampling sequence.

[0015] Preferably, in the step S4, it is required to simultaneously collect the signals received by multiple hydrophones to be measured, and use the fast Fourier transform to calculate the phase spectrum of the output signal of each hydrophone to be measured. Subtract the phase spectrum of each hydrophone to be measured from the reference benchmark to obtain the phase difference corresponding to the measurement frequency.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] Aiming at the problem of rapid and accurate measurement of the phase consistency of a batch of hydrophones in a laboratory pool environment, a rapid measurement method for the phase consistency of hydrophones is provided. Based on the detection conditions of the spherical wave sound field in the pool, a low-scattering multi-channel quick-disassembly encircling circular arc docking fixture is designed on the circular arc surface that meets the far-field distance of the sound field. Multiple hydrophones can be installed at one time, realizing the precise positioning and rapid disassembly and assembly of the hydrophones, and reducing the influence of position offset caused by frequent manual clamping. At the same time, a multi-frequency superposition pulse measurement method is proposed, combined with a multi-channel automatic detection system based on the PXI bus. By using spectrum analysis, the phase differences of the hydrophones corresponding to multiple frequency points can be obtained in a single measurement, which has the characteristics of high detection efficiency and high reliability. Description of the Drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of the circular arc docking fixture of the present invention.

[0019] Figure 2 It is a top view of the overall structure of the circular arc docking fixture of the present invention.

[0020] Figure 3 It is a schematic diagram of the clamp structure.

[0021] Figure 4 It is Figure 1 The enlarged view at position A in

[0022] In the figure: 1, flange rod; 2, rib plate; 3, arc frame; 4, docking pipe; 5, hydrophone; 6, fixed collar; 7, limit support rod; 8, cross bar; 9, clamp; 11, opening slot; 91, upper clamping block; 92, lower clamping block; 93, lock; 94, pin; 95, rectangular hole. Specific Embodiments:

[0023] The present invention will be further described below in conjunction with the drawings in terms of specific embodiments:

[0024] A rapid measurement method for the phase consistency of hydrophones includes the following steps:

[0025] Step 1: Fix the hydrophone under test using the circular arc docking fixture;

[0026] Step 2: Arrange the sound field

[0027] Step 3: Set up the measurement system and measurement signal;

[0028] Step 4: Collect and process the signals received by the hydrophones under test to obtain the phase differences between the hydrophones under test.

[0029] In this embodiment, the circular arc docking fixture is composed of an arc-shaped bracket, a docking pipe, and five groups of clamping components, as Figure 1As shown, the arc-shaped bracket includes a flange rod 1, a rib plate 2 and an arc-shaped frame 3, and the clamping component includes a fixing ring 6, a limiting support rod 7, a cross bar 8 and a clamp 9.

[0030] Specifically, the flange rod 1 of the arc-shaped bracket is fixedly connected to the arc-shaped frame 3. The upper end of the flange rod 1 is provided with two open grooves 11 for fastening to the flange of the pool lifting rod, and the lower end is fixedly connected to the arc-shaped frame 3. A rib plate 2 for improving the strength and rigidity of the clamp is provided on the flange rod 1 of the arc-shaped support frame. The upper and lower beams of the arc-shaped frame 3 are evenly arranged with multiple circular holes, and the upper and lower circular holes on the same vertical plane are grouped together.

[0031] Moreover, a plurality of clamping components are designed on one side of the arc-shaped bracket. The upper and lower ends of the limiting support rod 7 of each clamping component are respectively provided with fixing rings 6. The cross bar 8 and the fixing ring 6 can be fixed with butterfly screws, and one side of the cross bar 8 is connected to a clamp for clamping the hydrophone 5, and the other end is connected to the docking pipe 4.

[0032] Further, such as Figure 2 As shown, the clamping member's clamping hoop 9 is a quick-release structure, consisting of an upper clamping block 91, a lower clamping block 92, a lock buckle 93 and a latch 94. The rectangular protrusion of the upper clamping block 91 cooperates with the rectangular hole 95 of the lock buckle 93 to achieve the embracing and fixing of the hydrophone 4, and the clamping hoop 9 is freely opened and closed by the latch 94.

[0033] As an implementation mode, all the clamping parts have the same length, and the centers of the clamps 9 in the lower row or the upper row of the clamping parts are maintained on the same arc surface.

[0034] Furthermore, in step 2, a plurality of hydrophones are first fixed, and then the auxiliary transmitting transducer is arranged according to the radius of the arc frame of the arc fixing fixture. Finally, the lifting and rotating device is operated to arrange the acoustic centers of the hydrophone and the auxiliary transmitting transducer at the same water immersion depth.

[0035] As an implementation mode, in step 3, the measurement system power amplifier matching gear is set according to the selected auxiliary transmitting transducer impedance characteristics, and the transmitting signal period, pulse width and frequency amplitude are set according to the pool size and the auxiliary transmitting transducer response characteristics.

[0036] Furthermore, in step 4, a multi-channel acquisition device is used to synchronously record the output signal of each hydrophone, and the phase spectrum of the hydrophone output signal is obtained by fast Fourier transform calculation, and the phase difference is obtained by subtracting it from the reference phase spectrum. Each measurement requires the use of an averaging mode to obtain six groups of phase differences, and the average value of the six groups of phase differences is taken as the measurement result.

[0037] Aiming at the problem of rapid and accurate measurement of phase consistency of batch hydrophones in a laboratory water pool environment, the present invention designs a multi-channel quick-release embracing arc docking clamp with low acoustic scattering on an arc surface that meets the far-field distance of the sound field based on the detection conditions of the spherical wave acoustic field of the water pool. Multiple hydrophones can be installed at one time to achieve accurate positioning and rapid disassembly and assembly of the hydrophones, reducing the influence of position offset caused by frequent manual clamping. At the same time, a multi-frequency superposition pulse measurement method is proposed, which is combined with a multi-channel automatic detection system based on a PXI bus. The phase difference of hydrophones corresponding to multiple frequency points can be obtained in a single measurement by using spectrum analysis, which has the characteristics of high detection efficiency and high reliability.

[0038] The above is only an explanation of the preferred embodiments of the present invention, which should not be construed as a limitation on the claims. Any equivalent process changes made using the present invention specification are included in the patent protection scope of the present invention.

Claims

1. A rapid measurement method for the phase consistency of a hydrophone, characterized in that: Including the following steps: S1. Fix the hydrophone under test by using an arc docking fixture; S2. Arrange the sound field; S3. Set up the measurement system and measurement signals; S4. Collect and process the signals received by the hydrophone under test to obtain the phase difference between the hydrophones under test; Among them, in the said S1, the arc docking fixture consists of an arc-shaped bracket, a docking pipe and multiple groups of clamping components. Among them, the arc-shaped bracket includes a flange rod (1), a rib plate (2) and an arc-shaped frame (3) for connecting with the lifting rod of the water tank. Multiple round holes are evenly arranged on the upper and lower cross beams of the arc-shaped frame (3), and the upper and lower round holes in the same vertical plane are in a group; the clamping component includes a fixed collar (6), a limit support rod (7), a cross bar (8) and a clamp (9) to realize the surrounding fixation of the hydrophone under test.

2. The rapid measurement method for the phase consistency of a hydrophone according to claim 1, characterized in that: The arc docking fixture has five groups of clamping components. The lengths of the five groups of clamping components are the same, and the centers of the clamps (9) in a row at the lower end or the upper end of the five groups of clamping components are on the same arc surface.

3. The rapid measurement method for the phase consistency of a hydrophone according to claim 1, characterized in that: The clamp (9) is of a quick-release structure and consists of an upper clamp block (91), a lower clamp block (92), a lock (93) and a bolt (94).

4. The rapid measurement method for the phase consistency of a hydrophone according to claim 1, characterized in that: In the said S2, the requirement for sound field arrangement is that the horizontal distance between the auxiliary transmitting transducer and the hydrophone under test is equal to the radius of the arc-shaped frame of the arc docking fixture.

5. The rapid measurement method for the phase consistency of a hydrophone according to claim 1, characterized in that: In the said S3, the setting information includes the impedance matching file of the measurement system, select the output of one hydrophone under test as the reference benchmark, and set the frequency, amplitude, initial phase, pulse width and period of the superimposed test signal. Obtain a multi-frequency superimposed pulse signal: where i is the number of detected frequency points, f i is the i-th frequency, A i is the amplitude corresponding to the i-th frequency, is the initial phase corresponding to the i-th frequency, and t is the time sampling sequence.

6. The rapid measurement method for hydrophone phase consistency according to claim 1, characterized in that: In the said S4, it is required to perform simultaneous-base acquisition on the signals received by multiple hydrophones under test, and use the fast Fourier transform to calculate the phase spectrum of the output signal of each hydrophone under test, and subtract the phase spectrum of each hydrophone under test from the reference benchmark to obtain the phase difference corresponding to the measurement frequency.

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