Laboratory for electro-optics and sensor systems
Institute of automation
A miniature, fully optically controlled, dielectric, opto-thermally actuated tweezer/micro-gripper that is suitable for the manipulation of small objects is presented. The tweezer/micro-gripper is formed at the tip of an optical fiber and utilizes a mid-power laser diode for its actuation. Read More …
In this article, a novel miniature Fabry-Perot twist/rotation sensor using a four core fiber and quadruple interferometer setup is presented and demonstrated. Detailed sensor modeling, analytical evaluation and test measurement assessment were conducted in this contribution. The sensor structure comprises Read More …
Miniature, all-silica, fiber-optic sensors capable of independent measurement of at least two different parameters arepresented. Sensors were produced by a micromachining process based on the selective etching of specially designed phosphorous-doped optical fibers and an assembly-procedure that included fiber cleaving, Read More …
This paper proposes an all-optical-fiber sensor for continuous measurements of liquid levels. The proposed sensor utilizes an optically absorbing vanadium doped optical fiber, which is configured as a long-gauge, optically-heated, fiber-optic, Fabry-Perot interferometer that is immersed into the measured liquid. Read More …
This paper presents a micro-machined, high-resolution refractive index sensor suitable for monitoring of small changes in the composition of gases. Experimentally demonstrated measurement resolution, induced by gas composition variation, proved to be in the range of 5×10-9 of a Refractive Read More …
Tomaž Gregorec, 2022, master thesis, Summary: In the scope of this master’s thesis, the production of a system for off-axis laser splicing of silica capillaries and the production of a long active length absorption cell were covered. The capillary splicer enables the fabrication of special structures that offer new possibilities in the fabrication of optical fiber sensors. The absorption cell enables the measurement of light absorption in small volumes of liquids without the use of colorimetric reagents. The operation of the absorption cell was tested by measuring the ratio of isopropanol in water and by measuring the concentration of copper ions dissolved in water. Read More …
Jure Javornik, 2022, Master thesis Abstract: In this master thesis a system for all-fiber micro-cell manufacturing is presented. System was built around an already existing fs laser system. Thesis describes an ultrashort pulse generation method and the theoretical background of ultrashort pulse and material intercation. A procedure for sensor manufacturing is presented. Sensor's spectral responses and mechanical propreties are presented. The fabrication of microfluidic channels, microscrews and microresonators on the tip of the optical fiber is described. The thesis also incorporates in-fiber mirror fabrication with ultrashort laser pulses inducing local refractive index changes. Mirror inscription took place at different pulse energy levels and in different configurations of mirror allignment. Optical and mechanical propreties of the inscribed mirrors were measured. Two application examples were shown using inscribed mirrors. Keywords: Ultrashort pulses, femtosecond laser, micro-structres, mirror inscription, micro-cell Read More …
Dominik Gril, 2022, Master thesis Abstaract: In this master thesis, we are presenting procedure designing and manufacturing of microfluidic optical sensor system, which is intended for measuring of dissolved oxygen in water. Sensor is based on luminescence quenching phenomena. We present a detailed design, and manufacturing procedure of microfluidic flow sensor system. System can perform measurements on low flows of sample, so it can perform measurement on small volume of liquid. There is also described designing analogue electronic circuit, for measuring short lifetimes of reagent. Presentation and evaluation of measurement results is also performed. Keywords: Microfluidics, Dissolved oxygen, Luminescence, Optical sensor Read More …
Emanuel Nikl Hutinski, 2021, magistrsko delo Opis: Magistrsko delo obsega dva dela, teoretični in praktični del. Opisana je izdelava senzorja za zaznavanje raztezkov na osnovi Michelsonovega interferometra z dvema laserskima diodama. Nadalje so v delu predstavljene tudi simulacije, izbira komponent, Read More …
Obzorje 2020 MAGNELIQ Magnetno-električna tekočina za boljše zaznavanje
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