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

A measurement method and a window function technology, which are applied in the direction of measurement devices, vibration measurement in fluids, and measurement vibrations, can solve the problem of not being able to adapt to the requirements of wideband testing of transducers, and the frequency characteristics of transducers do not change with frequency at high frequencies. Obvious, low measurement frequency and other problems, to achieve the effect of reducing the amount of calculation, suppressing the same-sex noise, and meeting the test requirements

Active Publication Date: 2021-04-13
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 wideband complex response of transducer based on logarithmic variable window function
  • Device and method for measuring wideband complex response of transducer based on logarithmic variable window function
  • Device and method for measuring wideband 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 transducer broadband complex response measurement device and method based on a logarithmic variable window function. The logarithmic chirp signal of the calibration system is established to establish a logarithmic coordinate frequency response model of the transfer function. Through the analysis of the frequency response of the measurement system transfer function and the moving average window function, the corresponding moving average window function is calculated for the frequency response functions of different center frequencies, and more average points are used to obtain higher measurement accuracy; while at high In the frequency band, the frequency response of the transmitting transducer does not change significantly with respect to the frequency. At this time, the transfer function does not require high resolution and average points, which can simplify the calculation while ensuring the measurement accuracy. The linear response measuring device established by the invention can realize the broadband measurement of the transmitting response of the transducer and the sensitivity of the hydrophone.

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 Patents(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