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 system. The ink layer in the pools was estimated to be 2μm thin. The optical profilometer was used for reference measurements.
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 addition to Parylene C layers, the
applicability of sub-micron SD-OCT in printed electronics was studied using PET and epoxy covered solar cell,
a printed RFID antenna and a screen-printed battery electrode. A commercial SD-OCT system was used for
reference measurements.
Application of time domain, ultra high resolution optical coherence tomography (UHR-OCT) in evaluation of
microfluidic channels is demonstrated. Presented study was done using experimental UHR-OCT device based on a
Kerr-lens mode locked Ti:sapphire femtosecond laser, a photonic crystal fibre and modified, free-space Michelson
interferometer. To show potential of the technique, microfluidic chip fabricated by VTT Center for Printed
Intelligence (Oulu, Finland) was measured. Ability for full volumetric reconstruction in non-contact manner
enabled complete characterization of closed entity of a microfluidic channel without contamination and harm
for the sample. Measurement, occurring problems, and methods of postprocessing for raw data are described.
Results present completely resolved physical structure of the channel, its spatial dimensions, draft angles and
evaluation of lamination quality.
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