【発明の名称】衝撃音波発生装置及び発生方法

Japanese Patent JP2730714

B2

The novel method substantially reduces the pressure pulse generated by an implosion of a cavity within a body of water by aborting the implosion. The abortion of the implosion is produced by generating within the cavity an explosion at the instant that this cavity attains its maximum volume.The method can also be used to generate within a body of water an impulsive acoustic signal by generating a first explosion within the body of water to produce therein a powerful pressure pulse and a cavity of very low pressure, and then generating a second explosion within the cavity so as to establish hydrostatic pressure inside the cavity while the volume of the cavity remains within a few percent of its maximum volume.The apparatus comprises first (10) and second (10) explosive generators which consecutively create-two explosions within the body of water: a first explosion which produces within the body of water a powerful acoustic-pulse (P_o) and an expanding cavity (1) of very low pressure, and a second explosion which establishes hydrostatic pressure within the cavity (1) while the volume of the cavity (1) remains within a few percent of its maximum volume, thereby substantially reducing the ensuing secondary pressure pulses.

WO/2020/169729	SEISMIC SOURCE WITH CHAMBER FOR HOUSING WAVE GENERATOR
WO2008005101	DIVERSE BUBBLE SIZE GENERATION
JP3124556	[Title of Invention] Seismic pulse generator

ADORIEN PII PASUKU

JP3649886A

March 25, 1998

February 19, 1986

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ADORIEN PII PASUKU

G01V1/387; (IPC1-7): G01V1/387

JP48102001A
JP5014501A

【文献】米国特許3292140(US,A)
【文献】米国特許3744018(US,A)

Aoyama

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