Prof. Denis Donlagić Profile

Prof. Denis Donlagić

Assistant Professor at Univ of Maribor

SPIE Involvement:

Author

Publications (24)

SPIE Journal Paper | 4 June 2024 Open Access

Photothermal gas sensing with a custom-made, fiber-coupled Fabry–Pérot etalon

Manuel Tanzer, Benjamin Lang, Matej Njegovec, Vedran Budinski, Simon Pevec, Jure Javornik, Denis Donlagic, Alexander Bergmann

OE, Vol. 63, Issue 06, 064101, (June 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.6.064101

KEYWORDS: Sensors, Fabry Perot interferometers, Sensing systems, Reflection, Laser sources, Signal to noise ratio, Optical engineering, Laser interferometry, Signal detection, Nitrogen dioxide

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SPIE Journal Paper | 6 March 2019 Open Access

Multiparameter fiber-optic sensors: a review

Simon Pevec, Denis Donlagić

OE, Vol. 58, Issue 07, 072009, (March 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.7.072009

KEYWORDS: Sensors, Fiber Bragg gratings, Temperature metrology, Fiber optics sensors, Cladding, Single mode fibers, Temperature sensors, Interferometers, Optical engineering, Modulation

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Proceedings Article | 2 June 2014 Paper

Analysis of organic solvents and liquid mixtures using a fiber-tip evaporation sensor

Eyal Preter, Denis Donlagic, Vlada Artel, Rachel Katims, Chaim Sukenik, Avi Zadok

Proceedings Volume 9157, 91574Y (2014) https://doi.org/10.1117/12.2059371

KEYWORDS: Liquids, Sensors, Fiber optics sensors, Bioalcohols, Fiber coatings, Binary data, Optical fibers, Fringe analysis, Self-assembled monolayers, Coating

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Proceedings Article | 2 June 2014 Paper

Optical fiber Fabry-Pérot sensor fabrication based on focused ion beam post-processing

Ricardo Andre, Simon Pevec, Martin Becker, Jan Dellith, Manfred Rothhardt, Manuel Marques, Denis Donlagic, Hartmut Bartelt, Orlando Frazão

Proceedings Volume 9157, 91577T (2014) https://doi.org/10.1117/12.2059175

KEYWORDS: Sensors, Ion beams, Etching, Optical fibers, Structured optical fibers, Silica, Scanning electron microscopy, Glasses, Wet etching, Fiber optics sensors

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Proceedings Article | 15 May 2014 Paper

An all-fiber vacuum sensor based on thermo-optics' effect in vanadium-doped fiber

Ziga Matjasec, Denis Donlagic

Proceedings Volume 9141, 91411R (2014) https://doi.org/10.1117/12.2053776

KEYWORDS: Sensors, Thermal optics, Modulation, Vanadium, Fiber optics sensors, Standards development, Refractive index, Semiconductor lasers, Wavelength division multiplexing, Mirrors

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SPIE Journal Paper | 2 October 2013 Open Access

Cost-efficient speckle interferometry with plastic optical fiber for unobtrusive monitoring of human vital signs

Peter Podbreznik, Denis Donlagic, Dejan Lesnik, Boris Cigale, Damjan Zazula

JBO, Vol. 18, Issue 10, 107001, (October 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.10.107001

KEYWORDS: Speckle, Interferometry, Sensors, Vital signs, Speckle interferometry, Polymer optical fibers, Phase only filters, Signal detection, Speckle pattern, Optical fibers

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Proceedings Article | 7 November 2012 Paper

Monitoring of fluid evaporation using fiber-optic micro-cells

Eyal Preter, Borut Preložnik, Chaim Sukenik, Denis Donlagic, Avi Zadok

Proceedings Volume 8421, 84217Z (2012) https://doi.org/10.1117/12.975056

KEYWORDS: Microfluidics, Bioalcohols, Signal attenuation, Fiber optics, Fluid dynamics, Refractive index, Silica, Microfluidic imaging, Fiber optics sensors, Refraction

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Proceedings Article | 10 May 2012 Paper

Bend insensitive multimode fibers with extreme bend loss tolerance and high bandwidth

Denis Donlagic, Borut Lenardic, Saeed Rehman

Proceedings Volume 8368, 83680G (2012) https://doi.org/10.1117/12.921407

KEYWORDS: Optical fibers, Multimode fibers, Refractive index, Tolerancing, Cladding, Wavefronts, Waveguides, Defense and security, Phase velocity, Distance measurement

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Proceedings Article | 9 May 2012 Paper

In-line optical fiber-sensors based on low-loss semi-reflective in-fiber mirrors

E. Cibula, D. Donlagic

Proceedings Volume 8439, 843922 (2012) https://doi.org/10.1117/12.922202

KEYWORDS: Mirrors, Sensors, Reflectivity, Temperature sensors, Refractive index, Single mode fibers, Optical fibers, Fusion splicing, Etching, Cladding

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Proceedings Article | 9 May 2012 Paper

Micromachining of optical fibers using selective etching of doped silica glass

Simon Pevec, Edvard Cibula, Borut Lenardič, Denis Đonlagić

Proceedings Volume 8428, 84280S (2012) https://doi.org/10.1117/12.922045

KEYWORDS: Optical fibers, Etching, Micromachining, Silica, Glasses, Sensors, Doping, Fiber to the x, Photonic microstructures, Standards development

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Proceedings Article | 26 April 2012 Paper

A thermally scanned all-fiber interferometer based on vanadium-doped fiber

Žiga Matjašec, Stanislav Čampelj, Denis Đonlagić

Proceedings Volume 8426, 84261F (2012) https://doi.org/10.1117/12.922508

KEYWORDS: Interferometers, Modulation, Vanadium, Absorption, Michelson interferometers, Diodes, Sensors, Semiconductor lasers, Refractive index, Fiber optics

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Proceedings Article | 26 April 2012 Paper

All-fiber micro-machined Fabry-Perot strain sensor

Simon Pevec, Denis Đonlagić

Proceedings Volume 8426, 84261D (2012) https://doi.org/10.1117/12.921845

KEYWORDS: Sensors, Fiber optics sensors, Etching, Fabry–Perot interferometers, Silica, Signal processing, Multimode fibers, Active sensors, Image sensors, Micromachining

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Proceedings Article | 14 May 2010 Paper

Interrogation system for miniature all fiber optic sensor using temperature control of DFB laser diode and reference all fiber Bragg grating

Matej Njegovec, Denis Donlagic

Proceedings Volume 7726, 77261R (2010) https://doi.org/10.1117/12.854130

KEYWORDS: Fiber Bragg gratings, Semiconductor lasers, Sensors, Temperature metrology, Optical sensors, Interferometers, Fabry–Perot interferometry, Diodes, Calibration, Telecommunications

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This paper describes an efficient system for the interrogation of miniature all-fiber optic sensors, such as Fabry-Perot interferometers or Bragg gratings that change their spectral characteristics within a narrow wavelength band, under the influence of the measured parameter. The signal interrogation is performed by sweeping the laser diode's wavelength over the narrow spectral band containing information about the measured parameter. The optical source consists of a standard telecommunication distributed feedback laser diode with integrated elements for thermal control. The laser diode's sensitivity to temperature is used to cyclically sweep the emitted wavelength for approximately 3 nm. This allows for integration of FBGs and all-fiber FP interferometers with resonator lengths between 0.3 and 1 mm. The interrogation system further includes a wavelength reference, which was formed by a Bragg gratings pair that was temperature stabilized by the miniature Peltier element. The responses of both the optical sensor and the reference Bragg gratings are simultaneously recorded in time during the temperature-induced wavelength sweep. These characteristics are further digitally processed to eliminate any amplitude fluctuations and noise. The peaks in both recorded spectral characteristics are then used to calculate the value of the measured parameter, like for example, strain or temperature. There is, therefore, no need for additional wavelength measurements, which simplifies the presented system. The proposed system is built from standard opto-electronic devices and is, therefore, simple, easy to manufacture and costeffective. The system was tested using a 1 mm long sensing all-fiber Fabry-Perot interferometer for temperature measurements, and standard Bragg gratings for temperature and strain sensing. The achieved temperature repeatability was better than 0.5 °C, while the strain reparability proved to be about 10 με . The proposed system is thus appropriate for various industrial and other applications, requiring cost-effective measurements with optical sensors.

Proceedings Article | 12 October 2007 Paper

Ultra-miniature all-glass Fabry-Pérot pressure sensor manufactured at the tip of a multimode optical fiber

Éric Pinet, Edvard Cibula, Denis Đonlagić

Proceedings Volume 6770, 67700U (2007) https://doi.org/10.1117/12.734888

KEYWORDS: Sensors, Optical fibers, Multimode fibers, Manufacturing, Fiber optics sensors, Polishing, Optics manufacturing, Interferometry, Connectors, Capillaries

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Proceedings Article | 2 July 2007 Paper

Obstacle detector for the use with electric windows in vehicles

Matjaz Linec, Denis Donlagic

Proceedings Volume 6619, 66190Z (2007) https://doi.org/10.1117/12.738380

KEYWORDS: Sensors, Phase only filters, Silicon, Fiber optics sensors, Polymer optical fibers, Prototyping, Safety, Printed circuit board testing, Detector development, Optical fibers

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Proceedings Article | 9 June 2004 Paper

All-fiber Fabry-Perot strain sensor

Edvard Cibula, Denis Donlagic

Proceedings Volume 5502, (2004) https://doi.org/10.1117/12.566620

KEYWORDS: Sensors, Fiber optics sensors, Fabry–Perot interferometers, Reflectivity, Fiber optics, Micromachining, Signal processing, Fusion splicing, Sensor performance, Single mode fibers

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Proceedings Article | 22 July 2003 Paper

Vehicle axle detector for roadways based on fiber optic interferometer

Denis Donlagic, Marjan Hanc

Proceedings Volume 5050, (2003) https://doi.org/10.1117/12.484261

KEYWORDS: Sensors, Roads, Fiber optics sensors, Fiber optics, Interferometers, Filtering (signal processing), Signal detection, Telecommunications, Signal processing, Standards development

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Proceedings Article | 9 November 2000 Paper

A forward propagation fully distributed microbend sensor system

Denis Donlagic

Proceedings Volume 4185, 41850A (2000) https://doi.org/10.1117/12.2302153

KEYWORDS: Sensing systems, Sensors, Distributed computing, Refractive index, Dispersion, Multimode fibers, Signal detection, Computing systems, Backscatter, Signal processing

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Proceedings Article | 12 June 2000 Paper

Novel macrobend sensor structure based on selective launch of the fundamental mode in graded index multimode fiber

Denis Donlagic, Brian Culshaw

Proceedings Volume 3986, (2000) https://doi.org/10.1117/12.388122

KEYWORDS: Sensors, Multimode fibers, Fiber optics sensors, Single mode fibers, Structured optical fibers, Wave propagation, Fiber optics, Graded index fibers, Waveguides, Receivers

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Proceedings Article | 31 May 1999 Paper

Electrically passive acoustic-resonance-level gauge

Denis Donlagic

Proceedings Volume 3670, (1999) https://doi.org/10.1117/12.349726

KEYWORDS: Acoustics, Resonators, Waveguides, Sensors, Fiber optics, Absorption, Signal attenuation, Fiber optics sensors, Linear filtering, Interferometers

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Proceedings Article | 31 May 1999 Paper

Novel distributed fiber optic microbend sensor structure based on dispersion addressing

Denis Donlagic, Boris Pezdirc, Brian Culshaw

Proceedings Volume 3670, (1999) https://doi.org/10.1117/12.349750

KEYWORDS: Dispersion, Sensors, Fiber optics sensors, Cladding, Multimode fibers, Refractive index, Fiber optics, Distributed computing, Optical fibers, Signal processing

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Proceedings Article | 21 July 1998 Paper

Mode-selective/filtering microbend sensor structure for use in distributed and quasi-distributed sensor systems

Denis Donlagic, Brian Culshaw

Proceedings Volume 3330, (1998) https://doi.org/10.1117/12.316972

KEYWORDS: Sensors, Multimode fibers, Structured optical fibers, Single mode fibers, Distributed computing, Backscatter, Teeth, Receivers, Spatial filters, Optical fibers

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SPIE Journal Paper | 1 November 1997

Polarimetric temperature sensor: extinction ratio and sensing length examination

Miha Zavrsnik, Denis Donlagic, Dali Donlagic

OE, Vol. 36, Issue 11, (November 1997) https://doi.org/10.1117/12.10.1117/1.601558

KEYWORDS: Polarimetry, Lead, Polarizers, Temperature sensors, Temperature metrology, Sensors, Polarization, Interferometers, Light sources, Fiber optics

SPIE Journal Paper | 1 November 1997

Polarimetric temperature sensor: extinction ratio and sensing length examination

Miha Zavrsnik, Denis Donlagic, Dali Donlagic

OE, Vol. 36, Issue 11, (November 1997) https://doi.org/10.1117/12.10.1117/1.601558

KEYWORDS: Polarimetry, Lead, Polarizers, Temperature sensors, Temperature metrology, Sensors, Polarization, Interferometers, Light sources, Fiber optics

Showing 5 of 24 publications

Conference Committee Involvement (1)

29th International Conference on Optical Fiber Sensors

25 May 2025 | Porto, Portugal

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