公开(公告)号：US20210341320A1

公开(公告)日：2021-11-04

申请号：US17245645

申请日：2021-04-30

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Jeremiah Williams ,  Hengky Chandraalim

IPC: G01F1/10 ,  G01F1/115 ,  G01L11/02

Abstract: A passive microscopic flow sensor includes a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fiber. The three-dimensional microscopic optical structure includes a post attached off-center to and extending longitudinally from the cleaved tip of the optical fiber. A rotor of the three-dimensional microscopic optical structure is received for rotation on the post. The rotor has more than one blade. Each blade has a reflective undersurface that reflects a light signal back through the optical fiber when center aligned with the optical fiber, the blades of the rotor shaped to rotate at a rate related to a flow rate.