Ultrasonic transducer, a method for transmitting of an ultrasound wave, and a method for detecting of an ultrasound wave

A method for detecting of an ultrasound wave, said method comprising:

• receiving the ultrasound wave at an ultrasonic transducer comprising:
• a substrate comprising a frontside configured to face an external medium for propagation of the ultrasound wave;
• a membrane arranged to be suspended at a distance from a cavity surface of the substrate for defining a cavity between the membrane, the cavity surface, and at least one cavity wall, wherein the membrane is configured to transversally vibrate;
• wherein the ultrasonic transducer comprises at least one venting hole wall at the frontside for defining a venting hole at the frontside, wherein the ultrasonic transducer further comprises at least one venting channel wall defining a venting channel configured to connect the cavity to the venting hole, wherein the transducer has an acoustic resonance frequency and the membrane has a membrane resonance frequency, wherein the acoustic resonance frequency is different from the membrane resonance frequency, wherein the received ultrasound wave has a frequency corresponding to the acoustic resonance frequency;
• and
• detecting a vibration of the membrane at the frequency of the ultrasound wave, wherein the vibration is caused by the received ultrasound wave.