1. Risto A. Myllylä

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    1. Mentioned In 38 Articles

    2. Optical Coherence Tomography as a Characterization Method in Printed Electronics (Thesis)

      Optical Coherence Tomography as a Characterization Method in Printed Electronics (Thesis)
      This Thesis proposes and describes the use of optical coherence tomography (OCT) as a non-contact and non-destructive characterization technique for printed electronics. It is based on and includes the first published results of such an application of the OCT technique. Several different types of structures were studied to evaluate the feasibility of the application. The measurement data was used to define the surface topography, physical dimensions of the specimen features ...
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    3. 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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    4. 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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    5. Glucose sensing in flowing blood and Intralipid by laser pulse time-of-flight and optical coherence tomography techniques

      Glucose sensing in flowing blood and Intralipid by laser pulse time-of-flight and optical coherence tomography techniques
      In this paper, we compare the sensitivities of the two optical modalities, laser pulse time-of-flight (TOF) and optical coherence tomography (OCT), in regard to glucose sensing within the range of 0-1000 mg/dl in flowing blood and tissue-mimicking liquid (Intralipid). We show that TOF technique is about twice more sensitive than OCT, as well for blood as for Intralipid measurements. In case of TOF technique, glucose sensitivity in Intralipid is ...
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    6. Ultra-high resolution optical coherence tomography for encapsulation quality inspection

      Ultra-high resolution optical coherence tomography for encapsulation quality inspection
      We present the application of ultra-high resolution optical coherence tomography (UHR-OCT) in evaluation of thin, protective films used in printed electronics. Two types of sample were investigated: microscopy glass and organic field effect transistor (OFET) structure. Samples were coated with thin (1–3 μm) layer of parylene C polymer. Measurements were done using experimental UHR-OCT device based on a Kerr-lens mode locked Ti:sapphire femtosecond laser, photonic crystal fibre and ...
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    7. 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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    8. Complex Conjugate Resolved Retinal Imaging by One-micrometer Spectral Domain Optical Coherence Tomography Using an Electro-optical Phase Modulator

      Complex Conjugate Resolved Retinal Imaging by One-micrometer Spectral Domain Optical Coherence Tomography Using an Electro-optical Phase Modulator
      Full-range spectral domain optical coherence tomography (SD-OCT) with a 1-μm band light source is shown here. The phase of the reference beam is continuously stepped while the probing beam scans the sample laterally (B-scan). The two dimensional spectral interferogram obtained is processed by a Fourier transform method to obtain a complex spectrum leading to a full-range OCT image. A detailed mathematical explanation of the complex conjugate resolving method utilized is ...
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    9. Multilayer tissue phantoms with embedded capillary system for OCT and DOCT imaging

      Multilayer tissue phantoms with embedded capillary system for OCT and DOCT imaging
      We report about manufacturing of fully functional capillary network embedded into the multilayer tissue phantom. Polyvinyl chloride-plastisol was used as a host transparent medium. Scattering was introduced by adding the TiO2submicron particles. OCT technique was used to characterize the manufactured phantoms and to monitor the vessels filling with different liquids.
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    10. 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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    11. Fast retinal layer identification for optical coherence tomography images

      Fast retinal layer identification for optical coherence tomography images
      Fast method for identifying the internal limiting membrane (ILM) and retinal pigment epithelium (RPE) from optical coherence tomography images is demonstrated. To avoid unnecessary increment of calculation time, a strong downsampling of the original data set is performed to reduce a number of processed pixels. In ILM segmentation, the obtained data cube is filtered with two different kinds of parameters and two estimates for the position of ILM is determined ...
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    12. Wettability characterization method based on optical coherence tomography imaging

      Wettability characterization method based on optical coherence tomography imaging
      A novel method for surface wetting characterization based on contact angle measurements is presented. Three dimensional structural imaging of a droplet on a substrate is performed using optical coherence tomography (OCT) which provides micrometer resolution images without contact with the sample. An automatic OCT intensity variation based, layer segmentation method was implemented to identify air-droplet, droplet-substrate and air-substrate interfaces. A glycerol droplet on a rough tilted glass substrate was used ...
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    13. Simulation of optical coherence tomography images by Monte Carlo modeling based on polarization vector approach

      Simulation of optical coherence tomography images by Monte Carlo modeling based on polarization vector approach
      Monte Carlo method is applied for simulation of 2D optical coherence tomography (OCT) images of skin-like model. Layer boundaries in skin model feature curved shape which agrees with physiological structure of human skin. The effect of coherence properties of probing radiation on OCT image formation and speckles in the detected OCT signal is considered. The developed model is employed for image simulation both for conventional and polarization dependent time-domain OCT ...
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    14. Optical coherence tomography as an accurate inspection and quality evaluation technique in paper industry

      Optical coherence tomography as an accurate inspection and quality evaluation technique in paper industry
      Optical coherence tomography (OCT), a technique for the noninvasive imaging of turbid media, based on low-coherence interferometry, was originally developed for the imaging of biological tissues. Since the development of the technique, most of its applications have been related to the area of biomedicine. However, from early stages, the vertical resolution of the technique has already been improved to a submicron scale. This enables new possibilities and applications. This article ...
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    15. Optical coherence tomography as a method of quality inspection for printed electronics products

      Optical coherence tomography as a method of quality inspection for printed electronics products
      Application of time domain, ultra high resolution optical coherence tomography (UHR-OCT) in printed electronics products’ quality inspection is demonstrated. Presented study was done using experimental UHR-OCT device based on a Kerr-lens mode locked Ti:sapphire femtosecond laser, photonic crystal fibre and modified, free-space Michelson interferometer. Possibilities of the technique are demonstrated by analysis of an RF antenna—example of printed electronics products. Measurements were done with submicron axial resolution, offered ...
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    16. 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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    17. 1-15 of 38 1 2 3 »
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  2. About Risto A. Myllylä

    Risto A. Myllylä

    Risto Myllylä received the DSc (Eng) degree from the University of Oulu, Finland, in 1976. He has been an associate professor in the Department of Electrical Engineering, University of Oulu, since 1974 and a professor since 1995. From 1988 to 1995 he was a research professor in the Technical Research Centre of Finland. His research interests include industrial and biomedical instrumentation development, particularly in optical measurements. He has co authored two books and more than 500 papers and patents. Dr. Myllylä is a past president of Finnish Optical Society and an Advisory Committee Member of European Optical Society (EOS). He is a member of SPIE (Fellow), OSA, IEEE, and EOS.