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Pulse width frequency modulation light-driven sound wave emitter and modulation method

An acoustic wave emitter and light-driven technology, applied in ultrasonic/sonic/infrasonic wave transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve the problems that cannot meet the requirements of sound field distribution, and the sound field distribution of acoustic wave emitters is difficult to adjust flexibly , to achieve the effect of easy realization and low cost

Pending Publication Date: 2022-04-22
ZHEJIANG LAB
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sound field distribution of traditional sound wave transmitters is difficult to adjust flexibly, and cannot meet the needs of sound field distribution in special application scenarios

Method used

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  • Pulse width frequency modulation light-driven sound wave emitter and modulation method
  • Pulse width frequency modulation light-driven sound wave emitter and modulation method
  • Pulse width frequency modulation light-driven sound wave emitter and modulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] like figure 1 As shown, a phased array acoustic wave transmitter driven by PWM light includes a continuous light source 1 , a spatial light modulator 2 and a light-absorbing film 3 . The continuous light source 1 is a continuous laser or a laser diode, and the spatial light modulator 2 is a reflective digital micromirror device (DMD).

[0022] The continuous light 4 emitted by the continuous light source 1 enters the spatial light modulator 2, and the spatial light modulator 2 changes the spatial distribution of the continuous light 4 emitted by the continuous light source 1 so that the continuous light 4 is partially irradiated to all The light-absorbing film 3, the light-absorbing film 3 generates photoacoustic effect and excites the sound wave 6 after absorbing the light energy of part of the continuous light 5 irradiated on it, and realizes the pulse width by controlling the switch and time delay of the spatial light modulator 3 FM and Phased Array Acoustic Emissio...

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PUM

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Abstract

The invention discloses a pulse width frequency modulation light-driven sound wave emitter and a modulation method. The pulse width frequency modulation light-driven sound wave emitter comprises a continuous light source, a spatial light modulator and a light absorption film. The spatial light modulator changes spatial distribution of continuous light emitted by the continuous light source, so that the continuous light is partially irradiated to the light absorption film, and the light absorption film absorbs light energy of the continuous light irradiated to the light absorption film, generates a photoacoustic effect and excites sound waves. The continuous laser generated by the continuous light source is subjected to pulse width modulation in a delayed manner by controlling a switch of the spatial light modulator, and a plurality of sound waves with different frequencies and phased array sound emission are generated in different areas of the space. The phased array continuous sound wave emission system is simple in structure and good in realizability, sound waves with flexible and adjustable frequency and space distribution can be generated, and the requirements for sound wave frequency and space sound field distribution in different applications are met.

Description

technical field [0001] The invention relates to the technical field of acoustic wave emitters, in particular to an acoustic wave emitter suitable for generating a pulse-width-frequency-modulated light-driven acoustic wave whose frequency and spatial distribution are flexibly adjustable. Background technique [0002] The function of the acoustic wave transmitter is to convert the input electric power into sound waves and transmit them out. It is widely used in industrial testing, medical imaging, consumer electronics and other fields. Conventional sound emitters include speakers. Loudspeakers are usually made based on electromagnetic, piezoelectric or electrostatic effects that cause a diaphragm to vibrate and resonate with the surrounding air to produce sound. However, the sound field distribution of traditional sound wave emitters is difficult to adjust flexibly, and cannot meet the requirements for sound field distribution in special application scenarios. [0003] The p...

Claims

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Application Information

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IPC IPC(8): H04B10/524H04B11/00
CPCH04B10/524H04B11/00
Inventor 唐昆高大王少博王钰琪李驰野施钧辉
Owner ZHEJIANG LAB
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