Sensor for detecting pressure waves in a fluid, provided with static pressure compensation

A method of sensing a pressure in a medium comprising:

• providing two reference spots;
• connecting at least one resilient member between the two reference spots;
• exerting a tension force on the resilient member;
• receiving a pressure wave in the medium;
• generating a pressure response force in response to a momentary pressure in the medium;
• high-pass filtering the pressure response force to obtain a filtered response force;
• subtracting the filtered response force from the tension force;
• and
• optically measuring the actual distance between the reference spots as being representative for the pressure to be sensed.

A method of sensing a pressure in a medium comprising:

• providing two reference spots;
• receiving a pressure wave in the medium;
• generating a pressure response force in response to a momentary pressure in the medium;
• high-pass filtering the pressure response force to obtain a filtered response force;
• applying the filtered response force to at least one of the reference spots;
• and
• optically measuring the actual distance between the reference spots as being representative for the pressure to be sensed.

A pressure sensor device comprising:

• a pressure response element that has an operative length parallel to an operative direction that is responsive to pressure, and is arranged for exerting operative forces pulling or pushing in a direction parallel to the operative direction;
• a high-pass force-transmission member arranged for substantially passing the operative forces having frequency above a threshold frequency and for substantially reducing or blocking the operative forces having a frequency below the threshold frequency;
• and
• optical measuring means for measuring the actual distance between two reference spots as being representative for the pressure to be sensed;
• wherein the two reference spots define between them the operative direction.