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Clarence Zarobila (Assoc)

Mr. Zarobila is a physicist in PML's Sensor Science Division. He co-developed the Robotic Optical Scattering Instrument (ROSI), the national reference instrument for specular and bi-directional reflectance measurements. For that work he and his colleagues received the NIST Judson C. French award. He also co-developed the air-LUSI telescope, the "eye" of a system which measures the spectral irradiance of the moon from an aircraft flying near the top of the atmosphere. He supports NIST STARS and a variety of other projects in PML and EL by developing optical and engineering models. His research interests include interferometry, spectrophotometry, color and appearance, and sensing using optical and fiber-optic techniques.

Research projects


NIST Stars

Previous Publications

"Fiber-Optic Sensors," Davis, C. M. and Zarobila, C. J., In R.W. Waynant, & M.N. Ediger, Electro-Optics Handbook, (2nd ed., Chapter) New York: McGraw-Hill.

Selected Publications


Diffuse Visual Transmission Density

Clarence Zarobila, Robert E. Vest, Maria E. Nadal
This document, SP250-99 (2022), NIST Measurement Services: Diffuse Visual Transmission Density, describes the instrument used to measure diffuse visual

Disinfection of Respirators with Ultraviolet Radiation

Dianne L. Poster, Matthew Hardwick, C Cameron Miller, Michael A. Riley, W. W. Shanaka I. Rodrigo, Andras E. Vladar, John D. Wright, Christopher D. Zangmeister, Clarence Zarobila, Jeremy Starkweather, John Wynne, Jason Yilzarde
Data for interpreting virus inactivation on N95 face filtering respirators (FFRs) by ultraviolet (UV) radiation are important in developing UV strategies for
Created June 4, 2019, Updated March 2, 2024