Acoustic detection of position of a component of a fluid control device

A system for estimating a position of a component of a fluid control device, comprising:

• an optical fiber sensor having a section disposed at a fixed location relative to the fluid control device, the fluid control device configured to be disposed in a borehole in an earth formation and including a moveable member connected to an actuator, the fixed location selected so that acoustic signals generated by fluid flowing through the fluid control device are receivable by the section of the optical fiber sensor;
• an interrogation assembly configured to inject an optical signal into the optical fiber and receive a return signal;
• a position sensor disposed at the fluid control device, the position sensor configured to detect a position of the actuator;
• and
• a processing device configured to perform:
• associating the detected position of the actuator with an associated position of the moveable member;
• detecting the return signal, and identifying a signal pattern based on the return signal;
• and
• estimating a position of the moveable member based on the identified signal pattern;
• and
• comparing the associated position of the moveable member with the estimated position of the moveable member.