ANTI-SCRATCHING PROTECTION FOR ACOUSTIC SENSORS

摘要

An acoustic sensing element of an acoustic sensor and/or transducer can be covered with a composite material comprising a cover material and an anti-scratch material. In one aspect, an acoustic impedance of the cover material is lower than an acoustic impedance of the anti-scratch material. During acoustical sensing, the acoustic sensing element transmits an ultrasonic signal through the cover material and the anti-scratch material, which interferes with an object on (or near) the surface of the anti-scratch material. An interference signal that is generated based on an interference of the ultrasonic signal with the object propagates through the anti-scratch material and the cover material and is sensed by the acoustic sensing element. Further, an image of the object is recreated based on an analysis of the interference signal.

主权项

1. An acoustic sensor, comprising:
an acoustic sensing element; and a cover material deposited between the acoustic sensing element and an anti-scratch material, wherein an acoustic impedance of the cover material is lower than an acoustic impedance of the anti-scratch material.