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Personne :
Galstian, Tigran

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Galstian

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Tigran

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Université Laval. Département de physique, de génie physique et d'optique

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0000000116613117

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ncf10629873

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Résultats de recherche

Voici les éléments 1 - 3 sur 3
  • PublicationAccès libre
    Chip-scale full-Stokes spectropolarimeter in silicon photonic circuits
    (Optical Society of America, 2020-05-14) Galstian, Tigran; Dadalyan, Tigran; Bélander-de Villers, Simon; Lin, Zhongjin; Shi, Wei
    Wavelength-dependent polarization state of light carries crucial information about light–matter interactions. However, its measurement is limited to bulky, high energy-consuming devices, which prohibits many modern, portable applications. Here, we propose and demonstrate a chip-scale spectropolarimeter implemented using a complementary metal oxide semiconductor compatible silicon photonics technology. Four compact Vernier microresonator spectrometers are monolithically integrated with a broadband polarimeter consisting of a 2D nanophotonic antenna and a polarimetric circuit to achieve full-Stokes spectropolarimetric analysis. The proposed device offers a solid-state spectropolarimetry solution with a small footprint of 1 mm × 0.6 mm and low power consumption of 360 mW. Full-Stokes spectral detection across a broad spectral range of 50 nm with a resolution of 1 nm is demonstrated in characterizing a material possessing structural chirality. The proposed device may enable a broader application of spectropolarimetry in the fields ranging from biomedical diagnostics and chemical analysis to observational astronomy.
  • PublicationAccès libre
    Optical design challenges of subnivean camera trapping under extreme arctic conditions
    (2021-12-09) Galstian, Tigran; Gauthier, Gilles; Kalhor, Davood; Maldague, Xavier; Pusenkova, Anastasiia; Poirier, Mathilde
    Camera trapping is widely used in different ecological studies and is particularly important for remote locations and extreme environments. However, the application of camera traps in Arctic regions remains very limited. One of the challenges is the formation of hoar on the lens of cameras. In this article, we propose a solution to address this problem by changing the camera parameters and its position in order to optimize the camera trap for long-term subnivean deployment in the Canadian Arctic. Preliminary field tests show that this approach allows tracking lemmings in the frozen environment without natural light or external electrical power supply, where the direct observations are impossible for the most part of the year. We obtained the first videos of lemmings under the snow during the Arctic winter. Extending the observational network of the newly designed camera traps will help to better understand lemming population dynamics. The demonstrated approach is also promising for other polar applications.
  • PublicationAccès libre
    A camera trap to reveal the obscure world of the arctic subnivean ecology
    (IEEE Sensors Council, 2021-10-22) Galstian, Tigran; Gauthier, Gilles; Maldague, Xavier; Pusenkova, Anastasiia; Kalhor, Davood; Poirier, Mathilde
    Subnivean life is an important part of the Arctic ecosystem but it has been little explored. Long, harsh winters in addition to remoteness have made direct studies in these hardly accessible areas very expensive and extremely difficult. To tackle this problem, a low-power autonomous camera system (called ArcÇav) is developed for monitoring small mammals beneath the snow in the Canadian Arctic. ArcÇav is composed of several components, including a digital camera, a single board computer, a microcontroller board, and a motion detection sensor. A limited energy source, very cold temperatures, darkness, and a very long recording period (several months) are major challenges that ArcÇav is designed to deal with. The performance of the developed system is evaluated in a real situation in the High Arctic. The field results show that ArcÇav can function well for an extended period of time on a battery at very low temperatures during the arctic winters. To the best of our knowledge, this is the first time that life under snow has been filmed by a camera trap in the Arctic during winter. ArcÇav equips ecologists with a new means to explore and study subnivean life remotely. These observations can provide a foundation to answer some of questions that have puzzled animal ecologists for decades.