Device and method for testing acoustic wave impedance of gradient medium
A technology of acoustic impedance and testing device, which is applied to the analysis of fluids using sonic/ultrasonic/infrasonic waves, and the analysis of solids using sonic/ultrasonic/infrasonic waves, etc. It can solve the problems of insufficient calculation accuracy, large workload and low efficiency.
Inactive Publication Date: 2013-03-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
Although this method can get the test results, but the workload is huge, the calculation accuracy is not enough and the efficiency is low
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[0017] The present invention will be described in detail below in conjunction with specific embodiments.
[0018] Such as figure 1 As shown, a novel gradient medium acoustic impedance testing device and testing method of the present invention is composed of a charge amplifier, a voltage amplifier, a modulator, a DC stabilized power supply, a waveguide coaxial converter, a disk array, and an acoustic oscillation receiver. The function generator adopts 23Hz-76Hz tunable AC technology, the cosine wave distortion is less than 0.26%, and the acoustic impedance detection accuracy is 1×10 -3 Rayleigh. The current output by the charge amplifier is below 27mA, and the dynamic voltage is 7V. The electromagnetic coil is pressed from a nickel steel wire with a thickness of 0.05mm. The acoustic wave receiver is sintered from fresh, high-purity W, Mo, Ti, Fe and Al powders, and their average particle diameters are 1.5, 2.3, 60, 79 and 102 μm, respectively. After fully mixing, hot press ...
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Abstract
The invention relates to a device and a method for testing the acoustic wave impedance of a gradient medium, and belongs to the technical field of acoustic wave material test. The invention provides a method for acquiring the acoustic wave impedance of the gradient medium by one-time measurement. The device for testing the acoustic wave impedance of the gradient medium consists of a function generator, a charge amplifier, a voltage amplifier, a modulator, a direct-current voltage stabilization power supply, a waveguide coaxial converter, a disk array and an acoustic wave oscillation receiver.In the device, interference of noise is controlled by forbidden band filtration and amplification so as to realize electromagnetic shielding. The acoustic wave impedance of the gradient medium is acquired through a gene genetic algorithm and compared with curve data acquired by the test device, so that the structure of the gradient medium and the influence of a tissue state on the impedance are accurately tested in the loop. The device and the method can be also used in the fields of measurement of other heterogeneous materials and be popularized in the fields of measurement of electromagnetic gradient media, and have the characteristics of simpleness and accuracy.
Description
technical field [0001] A gradient medium acoustic impedance testing device and a testing method belong to the technical field of acoustic wave material testing, and relate to a novel gradient medium impedance testing device and testing method, which are used to obtain gradient medium acoustic impedance. Background technique [0002] The precise measurement of the impedance of the gradient medium has a wide range of applications in remote sensing applications, acoustic communications, sonar detectors, acoustic and biological sensors, and nano-micro devices. In these applications, the acoustic impedance characteristics of gradient media are crucial parameters. How to accurately determine the acoustic impedance characteristics of gradient media through a simple test has always been an important technical difficulty in testing. Among the current various testing methods, only indirect testing can be performed on the acoustic impedance parameters of the gradient medium, and calcul...
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IPC IPC(8): G01N29/02G01N29/04
Inventor李永舒畅
OwnerBEIJING INSTITUTE OF TECHNOLOGYGY