Acoustic sounding system for measuring distances
Номер патента: GB2438577A
Опубликовано: 28-11-2007
Автор(ы): Walter Franklin Guion, Weatherford Lamb Inc, Weatherford U S Lp Partnership
Принадлежит: Weatherford Lamb Inc
Опубликовано: 28-11-2007
Автор(ы): Walter Franklin Guion, Weatherford Lamb Inc, Weatherford U S Lp Partnership
Принадлежит: Weatherford Lamb Inc
Реферат: An acoustic generator, a device that generates sound by opening a pressurized gas chamber (80) to a gaseous void, comprising a chamber having at least one valve (84) that opens to a void, a pressure system (90s) linked to the chamber to set the chamber's gas pressure to a different pressure than the void's gas pressure when the valve is in the closed position, an actuator (20) that continues to apply an actuating force to the valve (84) after the valve is cracked open and the unequal gas pressures begin to equilibrate, said actuating force being other than the force created by the unequal gas pressures equilibrating, and an offset system (45) linked to the valve that opposes the effects of the equilibrating force upon the valve.
Distributed survey system for obtaining underground electrical characteristics and distributed survey method using same
Номер патента: US20150369948A1. Автор: Yoshihiro Yamashita,Hiromasa Shima,Kou Sano. Владелец: Bureau de Recherches Geologiques et Minieres BRGM. Дата публикации: 2015-12-24.