公开(公告)号：US20210372921A1

公开(公告)日：2021-12-02

申请号：US17335804

申请日：2021-06-01

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

Inventor： Jennie Burns ,  Joel Bixler

IPC: G01N21/45

Abstract: A digital speckle pattern interferometer (DSPI) is provided for long-range measurement of displacement of materials within a hazardous environments. A test arm of a portion of coherent beam from a laser is aimed at a selected angle to traverse a distance to a test surface. An input collimator has a lens wide enough to receive a reflected beam from the test surface and is focused at a corresponding distance. The reflected beam is combined with a reference beam split from the coherent radiation onto a camera for measuring displacement of the test surface based on an electronic speckle pattern interferometer (ESPI).