Near-field calibrating method for acoustic parameters of high-frequency ultrasonic emitter and array
A technology of acoustic parameters and calibration methods, applied in the direction of electrical components, etc., can solve problems such as unsatisfactory signal-to-noise ratio, difficulties in implementing high-frequency ultrasonic transmitters and their arrays, etc.
Active Publication Date: 2015-01-28
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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[0004] The purpose of the present invention is to solve the problems that the high-frequency ultrasonic transmitter and its array are difficult to implement in the process of far-field acoustic parameter measurement, and the signal-to-noise ratio cannot be satisfied. Field calibration method, and to avoid the limitations of sound pressure phase measurement in the near-field measurement process of high-frequency transmitters or arrays, two sets of measurement surfaces that are very close and parallel to each other are obtained in the near-field of high-frequency transmitters or arrays. Complex sound pressure data, using finite difference approximation to construct a virtual "secondary sound source", and then using the Rayleigh integral method to calculate the sound pressure at a given point in the far field of the high-frequency ultrasonic transmitter or array value, and based on this method, a set of calibration system was established
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[0037] Further description will be made below in conjunction with the accompanying drawings and embodiments. The present invention is used to calibrate a planar emitter ( image 3 ) Implementation process and examples of the sound field:
[0038] Such as figure 1 as shown in figure 1 As shown, the present invention is a high-frequency ultrasonic transmitter and its array acoustic parameter near-field calibration method. The test calibration device mainly includes a signal source, a power amplifier, a high-precision three-dimensional scanning motion positioning mechanism, a high-frequency hydrophone, and a preamplifier. , digital oscilloscope, program-controlled computer, etc. The signal source generates a sinusoidal filling pulse wave signal, which is amplified by a power amplifier to drive a high-frequency ultrasonic transmitter or array to radiate sound waves into the water. The high-frequency needle-type hydrophone or diaphragm-type hydrophone is installed on a high-preci...
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The invention relates to a near-field calibrating method for acoustic parameters of a high-frequency ultrasonic emitter and an array. The near-field calibrating method is characterized by acquiring complex sound pressure data on two mutually parallel planes close to a near field of the high-frequency emitter, obtaining mass point vibration velocity distribution of the position by means of difference approximation, establishing a 'secondary acoustic source' of the mass point vibration velocity, computing a sound field of the emitter and the array by means of Rayleigh integral formula, and accordingly, obtaining acoustic parameters of the high-frequency emitter and the array. The near-field calibrating method has the advantages of simplicity and convenience in implementation, high computing efficiency, accuracy and the like, and is applicable to calibration and testing of sound pressure in the sound field of the optional-shaped high-frequency ultrasonic emitter and the array thereof.
Description
Technical field [0001] The invention relates to the field of measurement and calibration of acoustic parameters of ultrasonic transducers, in particular to the field of measurement and calibration of underwater ultrasonics, and mainly relates to a near-field calibration method for high-frequency ultrasonic transmitters and array acoustic parameters. Background technique [0002] Usually, the detection of the acoustic performance of transducers or acoustic arrays needs to meet the far-field distance condition (l≥D 2 / λ), but as the operating frequency of the transmitting transducer or acoustic array increases, for the same transducer size, the far-field distance increases, and it is difficult for the test pool to meet the requirements. In addition, the high-frequency acoustic energy attenuates seriously with the increase of distance, and the signal-to-noise ratio condition that far-field detection needs to meet may be difficult to meet. At the same time, as the frequency inc...
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IPC IPC(8): H04R29/00
Inventor 王世全平自红黄勇军朱学文
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP