Under water listening device for receiving sound wave or earthquake wave

Application Number: 00108261
Application Date: 2000.04.26
Publication Number: 1272037
Publication Date: 2000.11.01
Priority Information: 1999/4/26 FR 99/05289
International: H04R1/44
Applicant(s) Name: Institut Francais Du Petrole
Inventor(s) Name: J. Lourente;G. Konstandino
Patent Agency Code: 31100
Patent Agent: li xiang
Abstract Hydrophone with two unsymmetrically connected sensitive elements. The hydrophone comprises a detection unit including a closed housing (1) delimited by two cups (2, 3) resting against each other, each one being provided with a flexible diaphragm (4) and at least two piezoelectric sensitive elements (6, 8) associated each with electrodes (7, 9), one outside the housing, the other inside the housing. The two sensitive elements are preferably different in size, notably with different diameters. Electrodes (7a, 9a) of the sensitive elements that are not in contact with cups (2, 3) are electrically interconnected and the electrodes in contact with cups (2, 3) are also electrically interconnected. Each detection unit is preferably included in a protective assembly (not shown). The hydrophone can be used for marine seismic monitoring or prospecting for example.