a single-piece can-shaped housing (1) sealed off by a diaphragm (12),

a sensor element (2), arranged in the housing (1), for transmitting and receiving ultrasound,

a matching layer (3) arranged between the diaphragm (12) and the sensor element (2),

a stress equalizing layer (5) which completely encloses the sensor element (2) except for a front side adjoining the matching layer (3) and is made of of an epoxy resin,

a clamping ring (4) coaxially enclosing the matching layer (3), and

a damping layer (6) that fills a cavity that remains in the housing (1) and is bounded by the clamping ring (4), the stress equalizing layer (5) and the housing (1).

Abstract: This ultrasonic transducer has a high chemical resistance and a small diameter and can be used over a very wide temperature range. It has a single-piece, can-shaped housing (1) sealed off by a diaphragm (12), a sensor element (2), arranged in the housing (1), for transmitting and receiving ultrasound, a matching layer (3) arranged between the diaphragm (12) and the sensor element (2), a stress equalizing layer (5) which completely encloses the sensor element (2) apart from a front area adjoining the matching layer (3) and is made of a thermosetting plastic, especially of an epoxy resin, a clamping ring (4) coaxially enclosing the matching layer (3), and a damping layer (6) that fills a cavity that remains in the housing (1) and is bounded by the clamping ring (4), the stress equalizing layer (5) and the housing (1).

U.S. Class: (73/290V) (367/152) (367/162) (310/324) (310/326)

IPC: (G01F 23/28)

US Patents Cited: 2430013 4130018 4184094 4326274 4523122 4984449 5121628 5329682 5363341 5375099 5418759 5541468

Priority: (EPX 19950928 95115281)

OG Section: Mechanical