MOBILE ACOUSTIC SIGNAL DETECTING

Brand	Owner	Address	Description
WELLSEIS	BOLT TECHNOLOGY CORPORATION	Four Duke Place Norwalk CT 06854	[ MOBILE ACOUSTIC SIGNAL DETECTING HYDROPHONES, ] HIGH ENERGY IMPULSIVE ACOUSTIC UNITS, AND [ APPARATUS FOR OPERATING ] [ HYDROPHONES AND ] ACOUSTIC UNITS;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

An acoustic detection of a discrete acoustic signal allows to detect a leak behind a casing (23) of a borehole. An acoustic amplitude (AA) is sampled during a recording time period (24; 64) at a determined position along the tube. Time intervals (26; 66) are defined inside of the recording time period (24), and for each time interval (26) the measured acoustic amplitudes are processed to obtain respectively a corresponding power-frequency spectrum (261). A plurality of the power-frequency spectra are analyzed to identify the discrete acoustic signal by detecting time and frequency dependant changes of power. Preferably the processing involves a Fourier transform analysis. A power-frequency time plot is used to conveniently identify the discrete acoustic event.