Programmable wave front control device

Abstract

The invention discloses a programmable wave front control device. The device includes a sound wave reflecting conduit with two open ends, the inner side of the sound wave reflecting conduit is provided with a movable plug, and the movable plug is matched with the port of the sound wave reflecting conduit, so that the movable plug blocks an open tube of the sound wave reflecting conduit. Since the movable plug is connected with a reciprocating movement mechanism, under the driving of a driving component, the reciprocating movement mechanism takes the movable plug to move in the sound wave reflecting conduit in a reciprocating manner, so that the distance from the other end of the sound wave reflecting conduit to the movable plug changes. The programmable wave front control device provided by the invention can adjust the effective distance of wave transmission in the sound wave reflecting conduit, control reflection of reflected waves, and specifically enable the distance from the other end of the sound wave reflecting conduit to the movable plug and phase difference between incident waves and reflected waves to be directly proportional, so that a wave front is controllable, and thus the programmable wave front control device can be applied to various fields needing control of the wave front, thereby solving related problems of the fields.

Description

technical field [0001] The invention relates to the field of sound wave technology, in particular to a programmable wave front control device. Background technique [0002] The problem of sound transmission in pipes is often used in acoustic research. Among them, a plane acoustic wave has an important characteristic, that is, its amplitude does not change with distance, but in the actual free space, what is obtained by using a general sound source is not a plane wave, but a spherical wave whose wave front gradually weakens with distance. The pipeline we are studying now is a good environment for the propagation of plane sound waves, so the pipeline has become a relatively important research environment for acoustic research. For example, the measurement of acoustic impedance and sound absorption coefficient of sound-absorbing materials, the calibration of microphone sensitivity, the measurement of some other acoustic parameters and the research and observation of some acous...

AI Technical Summary

Problems solved by technology

However, one problem currently exists is that once the length of the acoustic waveguide is determined, it cannot be changed. Only a fixed-length acoustic waveguide can be used to study the sound waves of the corresponding frequency band, or other measures such as changing the cross-sectional area mentioned above can be used to expand its application. scope

This not only causes a waste of resources, but also limits the range of use of the acoustic waveguide, causing inconvenience to the study of acoustic waves

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