We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing elem... more We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing element is a piece of material of high Verdet constant placed between polarizers. When the angle between the polarizers differs by 45 degrees, a signal of twice the frequency of the ac is generated--in addition to the usual signal with the same frequency as the current. The quotient of these two signals allows a normalized output to be obtained that is proportional to the amplitude of the current. Experimental results demonstrating the practicality of the procedure are presented.
This paper describes a simple interferometric arrangement, which allows a direct observation of B... more This paper describes a simple interferometric arrangement, which allows a direct observation of Berry's topological phase in optical fibers. The interferometer consists of a single mode, low birefringent fiber ring that involves a non-coplanar path (a helix). The fringe shift observed by changing the helix pitch permits the measurement of the geometrical phase.
Pure and Applied Optics: Journal of the European Optical Society Part A, 1998
A Michelson interferometer is presented which enables a direct measurement of Berry's geomet... more A Michelson interferometer is presented which enables a direct measurement of Berry's geometric phase (spin-redirection phase) resulting from light propagating through a helically wound optical single-mode fibre. The operation of the interferometer is interpreted in terms of Pancharatnam's theorem. In addition, we put the spin-redirection phase into the context of Pancharatnam's phase.
SO2 and NO2 were remotely measured in a main street of Montevideo city using Multiaxis-Differenti... more SO2 and NO2 were remotely measured in a main street of Montevideo city using Multiaxis-Differential Optical Absorption Spectroscopy (MAX-DOAS) combined with on-field selected targets. Target-based measurements are the basis of a new experimental procedure called Topographic Target Light scattering-DOAS (TOTAL-DOAS) that provides a well define absorption path to measure the near surface distribution of trace gases in the boundary layer. It combines the measurement principles of the long-path DOAS and zenith-scattered sunlight DOAS, within the near UV and VIS spectral range. We give a general description of the procedure and present first results of the 2006 campaign at Montevideo.
A gravity referenced optical inclinometer which uses a transparent fluid as angle-senor element i... more A gravity referenced optical inclinometer which uses a transparent fluid as angle-senor element is described. Its principle of operation is based on light refraction at a free surface of the fluid. Measurements were carried out in an optical inclinometer built by the authors, and a resolution of 0.0007 degrees was obtained. The inclinometer permits real-time angle determinations along two perpendicular axis.
We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing elem... more We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing element is a piece of material of high Verdet constant placed between polarizers. When the angle between the polarizers differs by 45 degrees, a signal of twice the frequency of the ac is generated--in addition to the usual signal with the same frequency as the current. The quotient of these two signals allows a normalized output to be obtained that is proportional to the amplitude of the current. Experimental results demonstrating the practicality of the procedure are presented.
This paper describes a simple interferometric arrangement, which allows a direct observation of B... more This paper describes a simple interferometric arrangement, which allows a direct observation of Berry's topological phase in optical fibers. The interferometer consists of a single mode, low birefringent fiber ring that involves a non-coplanar path (a helix). The fringe shift observed by changing the helix pitch permits the measurement of the geometrical phase.
Pure and Applied Optics: Journal of the European Optical Society Part A, 1998
A Michelson interferometer is presented which enables a direct measurement of Berry's geomet... more A Michelson interferometer is presented which enables a direct measurement of Berry's geometric phase (spin-redirection phase) resulting from light propagating through a helically wound optical single-mode fibre. The operation of the interferometer is interpreted in terms of Pancharatnam's theorem. In addition, we put the spin-redirection phase into the context of Pancharatnam's phase.
SO2 and NO2 were remotely measured in a main street of Montevideo city using Multiaxis-Differenti... more SO2 and NO2 were remotely measured in a main street of Montevideo city using Multiaxis-Differential Optical Absorption Spectroscopy (MAX-DOAS) combined with on-field selected targets. Target-based measurements are the basis of a new experimental procedure called Topographic Target Light scattering-DOAS (TOTAL-DOAS) that provides a well define absorption path to measure the near surface distribution of trace gases in the boundary layer. It combines the measurement principles of the long-path DOAS and zenith-scattered sunlight DOAS, within the near UV and VIS spectral range. We give a general description of the procedure and present first results of the 2006 campaign at Montevideo.
A gravity referenced optical inclinometer which uses a transparent fluid as angle-senor element i... more A gravity referenced optical inclinometer which uses a transparent fluid as angle-senor element is described. Its principle of operation is based on light refraction at a free surface of the fluid. Measurements were carried out in an optical inclinometer built by the authors, and a resolution of 0.0007 degrees was obtained. The inclinometer permits real-time angle determinations along two perpendicular axis.
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Papers by Erna Frins