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Hydrophone sensitivity calibration method based on sine function fitting

A calibration method and sine function technology, applied to vibration measurement in instruments and fluids, measuring vibration and other directions, can solve the problems of poor repeatability, low sensitivity and accuracy, and achieve the effect of avoiding influence, improving accuracy and eliminating accidental errors.

Pending Publication Date: 2020-12-04
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

[0007] In the hydrophone sensitivity calibration test, the manual reading calibration method has occasional errors, and the output signal of the hydrophone is affected by high-order harmonics, noise and amplitude modulation effects, so the traditional manual reading comparison method to calibrate the sensitivity of the hydrophone For the problems of low precision and poor repeatability, the present invention provides a hydrophone sensitivity calibration method based on sine function fitting, which improves the measurement accuracy and repeatability of hydrophone sensitivity

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  • Hydrophone sensitivity calibration method based on sine function fitting
  • Hydrophone sensitivity calibration method based on sine function fitting
  • Hydrophone sensitivity calibration method based on sine function fitting

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Embodiment

[0043] This embodiment is verified by simulation experiments. The initial conditions of the experiment are as follows: the sound source frequency is 500 Hz, the sensitivity of the standard hydrophone is -200 dB, the peak-to-peak output of the standard hydrophone is 0.5 V, and the peak-to-peak output of the hydrophone to be tested is 50 μV. The sensitivity of the standard hydrophone is theoretically -120dB. The sampling frequency of the two hydrophones needs to satisfy the sampling theorem, not generally. In the simulation, the sampling frequency of the hydrophone to be tested and the standard hydrophone are set to be the same, both of which are 10kHz.

[0044] Under ideal conditions, the output signals of the hydrophone to be tested and the standard hydrophone are single-frequency sinusoidal signals with the same frequency as the fundamental frequency of the sound source, respectively as figure 2 and image 3 As shown, the peak-to-peak output signals of the hydrophone under ...

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Abstract

The invention discloses a hydrophone sensitivity calibration method based on sine function fitting, and the method comprises the following steps: adopting a hydrophone sensitivity calibration system which is mainly composed of a sound source, a to-be-measured hydrophone, a standard hydrophone and a data processor, and enabling the data processor to record an output signal of the to-be-measured hydrophone and an output signal of the standard hydrophone; constructing a fitting function, fitting the two paths of hydrophone output signals, and obtaining signal peak-to-peak values corresponding tofundamental frequency items in the two paths of hydrophone output signals by utilizing a fitting coefficient; and substituting the fitting coefficient into a hydrophone sensitivity calculation formulato obtain the sensitivity of the to-be-measured hydrophone. According to the invention, accidental errors of a manual reading calibration method are overcome, and the measurement precision and repeatability of the sensitivity of the hydrophone are improved.

Description

technical field [0001] The invention relates to the sonar field of electronic equipment, in particular to a hydrophone sensitivity calibration method based on sinusoidal function fitting. Background technique [0002] The towed line array sonar has the advantages of less restricted array aperture by the platform space, low operating frequency and far away from the noise source of the towed platform. It is widely used in the detection and tracking of underwater targets such as surface ships and submarines. An important part of a towed line array sonar is an array of hydrophones arranged in a line. [0003] The most basic and important technical parameter index of hydrophone is sensitivity. Taking the piezoelectric hydrophone as an example, its sensitivity represents the ability of the hydrophone to convert the sound pressure signal into a voltage signal. The sensitivity of the hydrophone limits the optimization upper limit of other technical indicators of the sonar system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H3/00G01H11/08
CPCG01H3/005G01H11/08
Inventor 张海生罗斌王晓林
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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