High sensitivity optical measurement of skin gloss

We demonstrate a low-cost optical method for measuring the gloss properties with improved sensitivity in the low gloss regime, relevant for skin gloss properties. The gloss estimation method is based on, on the one hand, the slope of the intensity gradient in the transition regime between specular and diffuse reflection and on the other on...

Sustainability evaluation of graduate courses in an university of the South of Brazil

The Auditing Instrument for Sustainability in Higher Education (AISHE) is an assessment instrument developed specifically for higher education. The AISHE had been applied in many institutions in its first version (AISHE 1.0) and has a new version the AISHE 2.0, with new elements for evaluation (ROORDA, 2008). This paper shows the results of...

The effect of the longitudinal polarization component in multi-axial nulling interferometry for exoplanet detection

We show a fundamental limitation of multi-axial beam combiners in nulling interferometry. The longitudinal electric field induced by the focusing optics can drastically limit the performance of such a nulling interferometer. We further analyze the filtering capabilities of a single-mode optical fiber with respect to that longitudinal field.

Michelson wide-field stellar interferometry: Principles and experimental verification

A new interferometric technique for Michelson wide-field interferometry is presented that consists of a Michelson pupil-plane combination scheme in which a wide field of view can be achieved in one shot. This technique uses a stair-shaped mirror in the intermediate image plane of each telescope in the array, allowing for simultaneous correction...