DEVICE FOR MEASURING NATURAL ACOUSTIC NOISE IN BOREHOLE Russian patent published in 1998 - IPC

FIELD: geophysics. SUBSTANCE: device has three orthogonal detector of acoustic signals, commutator of detectors, serial circuit of filters unit, rectifiers unit, second commutator, analog-to- digital converter, transmitting unit, which is connected to logging cable. Said serial circuit is connected to input of amplifier. In addition device has two gravitation accelerometers, which outputs are connected to inputs of second commutator. They are oriented in order to align their axes of sensitivity to axes of sensitivity of two acoustic signals detectors which are directed in perpendicular to axis of borehole device. EFFECT: possibility to detect direction to source of acoustic signals, possibility to use single-wire logging cable for measuring in different band-widths of natural noises. 1 dwg