An apparatus for accurate remote distance sensing based on fiber-optic low-coherence light interferometry has been designed for molten glass level measurement. We demonstrate operation of the meter in an adverse industrial environment with <20-μm resolution (standard deviation) within a 20-mm range with the sensing head placed in an oven at ∼800 °C. In laboratory conditions we were able to measure with 3-μm resolution, which could be improved to submicrometer level by optimization of a reference arm of the interferometer and detection electronics.
© 1998 Optical Society of America
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(280.0280) Remote sensing and sensors : Remote sensing and sensors
Linas Giniunas, Remigijus Karkockas, and Romualdas Danielius, "Accurate Remote Distance Sensing by Use of Low-Coherence Interferometry: An Industrial Application," Appl. Opt. 37, 6729-6733 (1998)