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Acoustic impedance tube

An impedance tube and acoustic technology, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problems that the impedance tube cannot be measured, and the impedance tube is not flexible and portable, so as to achieve the effect of improving portability

Pending Publication Date: 2020-08-04
STATE GRID HUBEI ELECTRIC POWER RES INST +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Impedance tubes currently used in the field of acoustic measurement do not have the function of stretching and portability, and are generally installed on the console through impedance tube holders, and can only be measured by moving the position of the object to be measured. For immobile or one-time measurements There are many objects to be measured, and the measurement cannot be performed, which leads to great limitations of the impedance tube

Method used

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  • Acoustic impedance tube
  • Acoustic impedance tube
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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] Such as figure 1 As shown, an acoustic impedance tube includes an impedance tube, a positioning plate 1, and a telescopic support rod 7. The impedance tube includes a fixed sleeve 4 and a telescopic sleeve 5. The top of the telescopic sleeve 5 is provided with a speaker 6, and the telescopic sleeve The bottom of the tube 5 is inserted into the top of the fixed sleeve 4, the wall of the fixed sleeve 4 is provided with an acoustic measurement sensor 3, an...

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Abstract

The invention provides an acoustic impedance tube. The tube comprises an impedance tube, a positioning disc and a telescopic strut. The impedance tube comprises a fixed sleeve and a telescopic sleeve;a loudspeaker is arranged at the top of the telescopic sleeve; and the bottom of the telescopic sleeve is inserted into the top of the fixed sleeve, an acoustic measurement sensor is arranged on a wall of the fixed sleeve, the positioning disc is installed at the bottom of the fixed sleeve and used for fixing the acoustic impedance tube to the surface of a measured material, and a top end of thetelescopic strut is connected with the loudspeaker through a support and used for adjusting an overall height of the impedance tube. The two telescopic devices in the acoustic impedance tube can facilitate a user to adjust the lengths of different devices so as to correspond to to-be-measured materials with different frequencies, and portability of the acoustic impedance tube is improved.

Description

technical field [0001] The invention relates to the technical field of acoustic measurement, in particular to a novel portable acoustic impedance tube device. Background technique [0002] Acoustic impedance tube is a device used to measure the vertical incidence sound absorption coefficient of sound-absorbing materials. Its main body is a tube with a rectangular or circular section with a rigid wall, and the linear dimension of the section should be much smaller than λ / 2; for circular tubes, its diameter should be smaller than 0.586λ. The length of the tube should ensure that at least one antinode and one node appear in the tube at the lowest measurement frequency. One end of the tube is equipped with a sound source and a movable probe microphone, and the other end is reserved as a sample of the installation material, and the installation of the sample should be the same as that used for the actual material. The sound source generates a plane wave in the tube, which is pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/09
CPCG01N29/09
Inventor 蔡萱李小平王玉兴瞿子涵张莹
Owner STATE GRID HUBEI ELECTRIC POWER RES INST
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