Baker Hughes Corporation

Lance A Beckner

Brooks A Childers

Daniel Scott Homa

Robert M Harman

Daniel S Homa

An apparatus for estimating a property includes a hollow core tube and an input light guide disposed at least partially within hollow core tube. The apparatus also includes a second gap disposed within the hollow core tube and separated from the input light guide by an air gap width. The second gap is formed of a first solid material and has a second gap width. The apparatus also includes a third gap disposed at least partially within the hollow core tube and being further from the input light guide than the second gap. The third gap is formed of a second solid material and has a third gap width.

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Roanoke, VA, United States of America

Lance A Beckner