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Device and method for measuring broadband complex response of transducer based on logarithmic variable window function

A measurement method and a technology of a measurement device, which are applied to measurement devices, vibration measurements in fluids, and measurement vibrations, etc., can solve the problems of low measurement frequency, inconspicuous changes in frequency characteristics of transducers with frequency at high frequencies, and inability to adapt to transducers. Broadband test requirements for energy devices and other issues, to achieve the effect of suppressing same-sex noise

Active Publication Date: 2019-09-06
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At low frequencies, due to the low measurement frequency, the frequency bandwidth corresponding to each octave is narrow, so the frequency characteristics of the transducer change significantly with frequency at low frequencies; while at high frequencies, due to the high measurement frequency, each octave The frequency bandwidth corresponding to the range is relatively wide, and the frequency characteristic of the transducer does not change significantly with the frequency at high frequencies. At this time, the linear change of ordinary frequency cannot meet the broadband test requirements of the transducer.

Method used

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  • Device and method for measuring broadband complex response of transducer based on logarithmic variable window function
  • Device and method for measuring broadband complex response of transducer based on logarithmic variable window function
  • Device and method for measuring broadband complex response of transducer based on logarithmic variable window function

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Embodiment 1

[0026] Embodiment 1: As shown in the accompanying drawing, this transducer broadband complex response measurement device based on the logarithmic variable window function mainly includes the following components: a signal source that emits a logarithmic chirp signal and has an external trigger function; dual-channel Data acquisition system, the highest sampling rate of each channel is greater than 10 times the test frequency, and has an external trigger function, the phase deviation of the dual-channel data acquisition device does not exceed 2°; linear power amplifier, linear distortion is not greater than 2%; linear transmission changer standard hydrophone; two dual-channel preamplifiers, the phase consistency deviation between the channels of the dual-channel preamplifier does not exceed 2°; current sampler, the current and voltage deviation of the current sampler does not exceed 2° ;computer.

[0027] Signal sources, power amplifiers, transducers, preamplifiers, standard hy...

Embodiment 2

[0070] The specific implementation of the invention is described in detail below in conjunction with the measurement of the broadband emission current response of the transducer:

[0071] The measuring device as figure 1 As shown, the device is composed of a signal transmitter, a linear power amplifier, a transmitting transducer under test, a current and voltage sampler, a standard hydrophone, a preamplifier, a PXI data collector and a control system. The entire measurement is carried out in a fully anechoic pool of 50m×15m×10m.

[0072] The requirements for instrumentation in the system are as follows:

[0073] The signal source is a logarithmic chirp signal that can be transmitted, and the frequency accuracy of the transmitted signal is not less than 0.01%; the linear power amplifier must have a good match with the transmitting transducer, and have good linear characteristics in the working frequency band; the transmitting transducer works In the linear frequency range, ca...

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Abstract

The invention discloses a device and method for measuring the broadband complex response of a transducer based on a logarithmic variable window function. The invention mainly aims at the phenomenon that the frequency response change of an underwater acoustic transducer and a hydrophone has logarithmic characteristics, and establish a calibration system transfer function logarithmic coordinate frequency response model by transmitting orthogonal logarithmic chirp signals. By analyzing the frequency response of the transfer function of the measuring system and the moving average window function,aiming at the frequency response functions of different center frequencies, the corresponding moving average window function and more average points are calculated to obtain higher measuring precision; and in a high frequency band, the change of the frequency response of a transmitting transducer relative to the frequency is not obvious, and the transfer function does not need higher resolution and average points, so that the measurement accuracy is ensured, and the calculation is simplified. By utilizing the linear response measuring device established by the invention, the broadband measurement of the transmitting response of the transducer and the sensitivity of the hydrophone can be realized.

Description

technical field [0001] The invention relates to the field of transducer underwater acoustic parameter measurement, in particular to a transducer broadband complex response measurement device and method based on a logarithmic variable window function. Background technique [0002] With the development of underwater acoustic technology, underwater acoustic measurement plays an important role in ensuring the performance indicators and normal use of underwater acoustic equipment. At present, underwater acoustic transducers and hydrophones usually perform free-field measurements in limited waters or open waters. In order to avoid being affected by the boundary of limited waters, water surface and underwater obstacles during the measurement process, pulse sound technology is usually used for measurement. The direct sound and reflected sound signals are separated in time and space, thereby suppressing the influence of the reflected sound signal on the direct sound. In order to imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01H3/00
CPCG01H3/005G01S7/52004
Inventor 贾广慧陈毅杨柳青
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP