Patent ID: 6179084
Filing Date: 2001-01-30
Classification: G01V,Y10S

Abstract:
An underground acoustic wave transmitting device (30) arranged in a bore hole (12) for transmitting an acoustic wave in ground, characterized by including at least first and second source vibrators (32), with each said source vibrator (32) comprising:a mass body (40) arranged in an axial direction of said bore hole;a vibrator (34) disposed on said mass body such that the vibration direction is perpendicular to or parallel with a wall of said bore hole;an anvil (42) for contacting to said wall, disposed on said bore hole wall side of said vibrator; anda clamping mechanism (64) for pressure-contacting said anvil to said wall of said bore hole;wherein said first and second source vibrators (32) are substantially aligned with one another in said bore hole, with said first source vibrator (32) having a rotational position substantially 90.degree. from a rotational position of said second source vibrator (32).