RU1796064C - Method of increasing energy efficiency of parametric source of sound - Google Patents

Abstract

The invention relates to hydroacoustics and can be used to create highly efficient acoustic radiation. The purpose of the invention is to increase conversion stability and the ability to control conversion efficiency. In the far zone of the parametric sound source, a region of increased non-linearity is formed in the form of a layer of gas bubbles, which is created by electrolysis of water on a translucent electrically conductive electrode. Irradiation of the bubble layer by pump waves leads to the intense formation of difference frequency waves. 2 ill.

Description

ate with

The invention relates to hydroacoustics and can be used in acoustic radiation sources in a wide frequency band.

A method is known for increasing the energy efficiency of converting the energy of pump waves into the energy of difference frequency waves (VLF) by forming a region with cavitation bubbles formed by focusing the emitted pump waves. A disadvantage of the known solution is a significant expansion of the antenna pattern due to the significant attenuation of high-frequency waves on cavitation bubbles near the surface of the emitter.

There is also known a method of increasing the energy efficiency of a parametric sound source, which consists in creating a bubble in its far zone

curtains leading to increased non-linearity. A disadvantage of the solution is the difficulty in creating a uniform layer and maintaining its parameters unchanged over time and.

The aim of the invention is to increase the stability of the conversion and the ability to control the conversion efficiency.

The goal is achieved due to the fact that in the known method, the formation of a bubble zone with increased non-linearity is produced by electrolysis on the surface of a translucent electrically conductive plate.

In FIG. 1 shows a block diagram of a device for implementing the method: FIG. 2 is a timing diagram of the operation of a device that implements the method.

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The method includes the following operations: forming in the far zone of the irradiator a uniform bubble layer by electrolysis of water on a sound-conducting electrically conductive plate; irradiation of the formed bubble layer with pump waves.

A device for implementing the method comprises: 1 - a video pulse generator; 2 - delay circuit; 3 - shaper of rectangular pulses; 4 - rectangular pulse shaper; 5, 6 - generator of harmonic oscillations; 7, 8 — pulse modulator; 9.10 power amplifier; 11 - acoustic pump transducer; 12 - constant voltage source; 13 - pulse modulator; 14 - DC amplifier; 15, 16 - electrolysis plates,

The device operates as follows. At the output of the generator 1, l / h clock pulses are generated, synchronizing the operation of the entire device. The trailing edges of the clock triggers a delay circuit 2, which generates at its output video pulses of duration t3ad equal to the time interval necessary to reach the maximum amplitude value of 8 RF. past

Claims (1)

The claims A method of increasing the energy efficiency of a parametric sound source, including introducing into the far zone a parametric sound source, a layer of bubbles and irradiating it with waves to pump through a metal plate, and also starts the first rectangular pulse shaper 3, which generates video pulses From at its output equal to the duration of the emitted pump pulses . The second pulse shaper 4 also starts at the trailing edges of the pulses Hi, generating at its output video pulses of the aircraft with a duration m equal to the duration of the pulse voltage supplied to the electrolysis plates. Continuous oscillations with frequencies FI and F2 generated at the outputs of generators 5 and 6 arrive at the signal inputs of pulse modulators 7 and 8, at the outputs of which under the influence of video pulses From, radio pulses From and Ib are formed with harmonic filling, which are emitted into the water by an acoustic pump transducer 11. Before emitting the pump waves using a constant voltage source, the third pulse modulator 13 and amplifier 14 a pulse voltage of duration is generated, which is applied to the electrolysis plates 15 and 16 and thereby prepares a layer with an increased nonlinearity. characterized in that, in order to increase the stability of the conversion and the ability to control the conversion efficiency, a layer of gas bubbles is created by electrolysis directly on the surface of the soundproof electrically conductive plate. Fi-g. 2.