1. Tapio E. J. Fabritius

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    1. Mentioned In 17 Articles

    2. 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 μm x 141 μm sized and 6 rtm deep ink pools was studied. The volumetric OCT reconstruction was done using the experimental SMR SD-OCT device and a commercial SD-OCT imaging ...

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    3. 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 a continuous rate of 140,000 per second. The full width at half maximum of the point spread function obtained from a Parylene C sample was 0:98 m. In ...

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    4. 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 modified, free-space Michelson interferometer. Sub-micron resolution offered by the UHR-OCT system applied in the study enables registration of both interfaces of the thin encapsulation layer. Complete, volumetric characterisation of protective ...
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    5. 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 provided. The system’s measurement speed was 7.96 kHz, the measured axial resolution was 9.6 μm in air and the maximum sensitivity 99.4 dB. To demonstrate the ...
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    6. Blood flow imaging at deep posterior human eye using 1 um spectral-domain optical coherence tomography

      Blood flow imaging of deep posterior eye has been demonstrated by using 1-um spectral-domain optical coherence tomography. The high contrast imaging of deep posterior eye, such as the choroid and the sclera, enables blood flow imaging of choroidal vessels and short posterior ciliary arteries. Opt ... [Proc. SPIE 7168, 716808 (2009)] published Thu Feb 19, 2009.
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    7. Full-range, high-speed, high-resolution 1 mu m spectral-domain optical coherence tomography with BM-scan method for the human posterior eye imaging

      High-speed, high-resolution full-range 1 [mu]m spectral-domain optical coherence tomography has been demonstrated. The axial resolution of 7 [mu]m and the depth range of 2.6 mm in tissue are achieved with the line rate of 46,900 Hz. The sensitivity of 98 dB is obtained with full-range imaging. These ... [Proc. SPIE 7139, 713914 (2008)] published Tue Dec 30, 2008.
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    8. Full-range, high-speed, high-resolution 1μm spectral-domain optical coherence tomography using BM-scan for volumetric imaging of the human posterior eye

      An alternative optical coherence tomography (OCT) to clinical ophthalmic 830 nm spectral-domain OCTs (SD-OCT) is demonstrated. An axial resolution of 7.4 µm, ranging depth of 4.2 mm in tissue, sensitivity of 98.5 dB, and detection speed of 38,300 axial scans/s have been achieved. These are comparable or superior to those of recently commercially available ophthalmic 830 nm SD-OCTs in clinics. In addition, fast volumetric imaging for the in vivo human posterior eye with high-contrast of the choroid is achieved. A broadband 1.04 µm light source enables the high-contrast and high resolution imaging of the ...

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    9. Quantitative retinal-blood flow measurement with three-dimensional vessel geometry determination using ultrahigh-resolution Doppler optical coherence angiography

      ...Shuichi Makita, Tapio Fabritius, Yoshiaki Yasuno. Retinal blood flow quantification by retinal vessel segmentation with Doppler optical coherence angiography is presented. Vessel diameter, orientation, and pos...
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    10. Optical method for liquid sorption measurements in paper (Thesis)

      Optical method for liquid sorption measurements in paper (Thesis)
      This thesis presents an effective optical method for measuring liquid sorption into paper. From the two tested methods, based on a streak-camera and optical coherence tomography (OCT), the last-mentioned proved very promising for investigating dynamical paper-liquid interactions as spatially and temporally dependent processes. The streak-camera measurements were performed to explore the relationship between paper properties and light migration in dry and refractive index matched paper in general. Based on streak-camera measurements, a novel procedure for determining the average refractive index of cellulose fibre tissue was also presented here. In addition, the streak camera method lent itself to paper porosity determination ...
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    11. 1-17 of 17
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  2. About Tapio E. J. Fabritius

    Tapio Fabritius received the M.S. in 2003 and Ph.D degree in 2007 from University of Oulu, Finland, both in electrical engineering. He is still continuing his carrier in University of Oulu. In 2006-2007 he was visiting researcher in Computational Optics Group in University of Tsukuba, Japan. His main research interests are related to industrial and medical applications of optical coherence tomography.