Multilayer backing absorber for ultrasonic transducer

A backing absorber for use with an ultrasonic transducer, comprising:

• a first absorber element comprising a first metal layer bonded to a first adhesive layer and a first polymer layer coupled to said first metal layer;
• and
• a second absorber element comprising a second metal layer bonded to a second adhesive layer and a second polymer layer coupled to said second metal layer, said second metal layer arranged between and in contact with said first adhesive layer and said second polymer layer;
• wherein said backing absorber is adapted to be coupled to a vibrating layer of said ultrasonic transducer and configured to dampen ultrasonic signals emitted by said vibrating layer when said backing absorber is coupled to said vibrating layer, and
• wherein each of said first and second metal layers forms a periodic grating of metal strips.

A method of making a backing absorber for an ultrasonic transducer, comprising:

• forming a first absorber element by forming a first metal layer on a first polymer layer to define a periodic grating of metal strips and coupling said first metal layer to a first adhesive layer;
• forming a second absorber element by forming a second metal layer on a second polymer layer to define a periodic grating of metal strips;
• and
• bonding said second absorber element to said first absorber element by coupling said second polymer layer to said first polymer layer via said first adhesive layer such that said second metal layer is arranged between and in contact with said first adhesive layer and said second polymer layer,
• wherein a surface of said first absorber element is configured to be coupled to a corresponding surface of a vibrating layer of said ultrasonic transducer for absorbing ultrasonic waves.