1. Janne Lauri

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    1. Mentioned In 10 Articles

    2. Effect of solvent lamination on roll-to-roll hot-embossed PMMA microchannels evaluated by optical coherence tomography

      Effect of solvent lamination on roll-to-roll hot-embossed PMMA microchannels evaluated by optical coherence tomography
      Manufacturing of microfluidic based diagnostic devices requires small tolerances and uniform quality to guarantee reliable and repeatable test results. This work describes characterization of morphological changes that occur to a hot embossed PMMA microfluidic channel after solvent lamination with a PMMA lid. A non-contact cross-sectional analysis of the lidded microfluidic device was performed by optical coherence tomography (OCT). The solvent induced morphology change led to a porous structure in bottom ...
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    3. Quantification of cell-free layer thickness and cell distribution of blood by optical coherence tomography

      Quantification of cell-free layer thickness and cell distribution of blood by optical coherence tomography
      A high-speed optical coherence tomography (OCT) with 1 - m axial resolution was applied to assess the thickness of a cell-free layer (CFL) and a spatial distribution of red blood cells (RBC) next to the microchannel wall. The experiments were performed in vitro in a plain glass microchannel with a width of 2 mm and height of 0.2 mm. RBCs were suspended in phosphate buffered saline solution at the hematocrit ...
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    4. Characterization of ink-jet printed RGB color filters with spectral domain optical coherence tomography

      Characterization of ink-jet printed RGB color filters with spectral domain optical coherence tomography
      We present the use of sub-micron resolution optical coherence tomography (SMR SD-OCT) in volumetric characterization of ink- jet printed color filters, aimed for electronic paper display (EPD). The device used in the study is based on supercontinuum light source, Michelson interferometer centered at 600 nm and employs 400-800 nm spectral region. Spectra are acquired at a continuous rate of 140,000 per second. Color filter array of 143 mu;m ...
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    5. Sub-micron resolution high-speed spectral domain optical coherence tomography in quality inspection for printed electronics.

      Sub-micron resolution high-speed spectral domain optical coherence tomography in quality inspection for printed electronics.
      We present the use of sub-micron resolution optical coherence tomography (OCT) in quality inspection for printed electronics. The device used in the study is based on a supercontinuum light source, Michelson interferometer and high-speed spectrometer. The spectrometer in the presented spectral-domain optical coherence tomography setup (SD-OCT) is centered at 600 nm and covers a 400 nm wide spectral region ranging from 400 nm to 800 nm. Spectra were acquired at ...
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    6. Determination of suspension viscosity from the flow velocity profile measured by Doppler Optical Coherence Tomography

      Determination of suspension viscosity from the flow velocity profile measured by Doppler Optical Coherence Tomography
      In this paper we present, for the first time to our knowledge, the experimental results for determining suspension viscosity in a capillary type viscometer from flow velocity profiles measured by Doppler Optical Coherence Tomography. The suspension of 0.3?m polystyrene microspheres in a glycerol-water solution was used as a model fluid. The viscosity of the suspension was controlled by glycerol concentration. The shear rate and the shear stress at ...
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    7. Experimental study of the multiple scattering effect on the flow velocity profiles measured in intralipid phantoms by DOCT

      Experimental study of the multiple scattering effect on the flow velocity profiles measured in intralipid phantoms by DOCT
      Abstract  Time domain Doppler Optical Coherence Tomography (DOCT) technique was applied to measure flow velocity profiles in highly scattering media. We analyzed the distortions of the measured velocity profiles of the 1% Intralipid solution flow embedded into the scattering medium at different embedding depths. For this purpose a tissue phantom consisting of a plain glass capillary (inner diameter 0.3 mm) embedded into a slab of Intralipid solution mimicking human ...
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    8. Effect of light scattering superficial layer on the accuracy of flow velocity profiles measurements by Doppler optical coherence tomography

      Effect of light scattering superficial layer on the accuracy of flow velocity profiles measurements by Doppler optical coherence tomography
      Doppler Optical Coherence Tomography (DOCT) is a modern technique used for accurate measurements of blood flow in the superficial layers of human skin, retina or other tissues and their phantoms. In this work, we considered the effect of both static and dynamic superficial layer of the scattering medium on the measured velocity of a flow located beneath this layer. In the case of static layer a tissue phantom consisting of ...
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    9. Doppler OCT imaging of cytoplasm shuttle flow in Physarum polycephalum

      The Doppler optical coherence tomography technique was applied to image the oscillatory dynamics of protoplasm in the strands of the plasmodium of slime mould Physarum polycephalum. Radial contractions of the gel-like walls of the strands and the velocity distributions in the sol-like endoplasm streaming along the plasmodial strands are imaged. The motility inhibitor effect of carbon dioxide on the cytoplasm shuttle flow and strand-wall contraction is shown. The optical attenuation ...
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  2. About Janne Lauri

    Janne Lauri

    Janne Lauri graduated with a Master’s degree from the University of Oulu, Finland 2007. He did his Diploma thesis about flow velocity profile measurements with Doppler optical coherence tomography. Now he is a PhD student in Optoelectronics and Measurement Techniques Laboratory, University of Oulu. He is currently working with flow velocity measurements with industrial suspensions as well as biomedical suspensions to characterize fluids flow properties. His research interest also includes structure measurements with optical coherence tomography.