1. Articles from Xiaojing Mu

    1-6 of 6
    1. MEMS Electrostatic Double T-Shaped Spring Mechanism for Circumferential Scanning

      MEMS Electrostatic Double T-Shaped Spring Mechanism for Circumferential Scanning

      A novel microelectromechanical systems (MEMS)-based microscanner is developed with the ultimate goal of integrating it into an endoscopic probe for use in clinical investigations. Microassembly technology is utilized to construct this device, which consists of an electrostatic-based microactuator and a pyramidal polygonal microreflector. A two-stage double T-shaped spring beam system is introduced to the actuator for displacement amplification as well as for motion transfer from the translational movement of the in-plane comb drives to the rotation of the central ring-shaped holder. In the meantime, an eight-slanted-facet-highly-reflective pyramidal polygonal microreflector is developed using high-precision diamond turning and soft lithography technologies ...

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    2. Electrostatic Micromachined Resonating Micro-Scanner for Circumferential Endoscopic Bio-Imaging

      Electrostatic Micromachined Resonating Micro-Scanner for Circumferential Endoscopic Bio-Imaging

      An electrostatic actuation-based resonating microelectromechanical systems (MEMS) polygonal mirror micro-scanner is developed for endoscopic probes used in clinical investigations. Microassembly technology is utilized to construct this device, which consists of a micro-actuator of four sets of electrostatic comb-drive resonators and an eight-slanted-facet highly reflective pyramidal polygon micro-reflector. The pyramidal polygon micro-reflector is developed using high precision diamond turning and soft lithography molding technologies. An optical scan angle of near-360 degrees is achieved at a resonant frequency of 180 Hz when driven by electrostatic comb-drive resonators with 80 Vpp ac voltage.

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    3. Feature Of The Week 4/22/12: Novel MEMs-Driven OCT Endoscopic Imaging Probe Investigated by Singapore Researchers

      Feature Of The Week 4/22/12: Novel MEMs-Driven OCT Endoscopic Imaging Probe Investigated by Singapore Researchers

      Optical coherence tomography (OCT) has demonstrated its potential as a powerful imaging technology due to its cellular or even subcellular resolution (1-10 μm), which is considered suitable for early detection and diagnosis of cancer. For some clinic applications, for example, intravascular or gastrointestinal investigation, full circumferential scanning (FCS) is highly desired. Early research efforts on FCS such as spinning the entire catheter with build-in cables and fibers were capable of scanning at limited speeds with nonlinear motion due to the long cable rotation. Commercially-available micromotors have also been employed to spin mirrors or prisms to achieve FCS. In recent years ...

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    4. Compact MEMS-driven pyramidal polygon reflector for circumferential scanned endoscopic imaging probe

      Compact MEMS-driven pyramidal polygon reflector for circumferential scanned endoscopic imaging probe

      A novel prototype of an electrothermal chevron-beam actuator based micro-electromechanical systems (MEMS) platform has been successfully developed for circumferential scan. Microassembly technology is utilized to construct this platform, which consists of a MEMS chevron-beam type microactuator and a micro-reflector. The proposed electrothermal microactuators with a two-stage electrothermal cascaded chevron-beam driving mechanism provide displacement amplification, thus enabling a highly reflective micro-pyramidal polygon reflector to rotate a large angle for light beam scanning. This MEMS platform is ultra-compact, supports circumferential imaging capability and is suitable for endoscopic optical coherence tomography (EOCT) applications, for example, for intravascular cancer detection.

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    5. Microfabricated endoscopic probe integrated MEMS micromirror for optical coherence tomography bioimaging

      Microfabricated endoscopic probe integrated MEMS micromirror for optical coherence tomography bioimaging
      In this paper, we present a miniaturized endoscopic probe, consisted of MEMS micromirror, silicon optical bench (SiOB), grade index (GRIN) lens, single mode optical fiber (SMF) and transparent housing, for optical coherence tomography (OCT) bioimaging. Due to the use of the MEMS micromirror, the endoscopic OCT system is highly suitable for non-invasive imaging diagnosis of a wide variety of inner organs. The probe engineering and proof of concept were demonstrated by obtaining the two-dimensional OCT images with a cover slide and an onion used as standard samples and the axial resolution was around 10µm.
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    1-6 of 6
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  2. Topics in the News

    1. (5 articles) National University of Singapore
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    Microfabricated endoscopic probe integrated MEMS micromirror for optical coherence tomography bioimaging Compact MEMS-driven pyramidal polygon reflector for circumferential scanned endoscopic imaging probe Feature Of The Week 4/22/12: Novel MEMs-Driven OCT Endoscopic Imaging Probe Investigated by Singapore Researchers An electrostatic in-plane rotational MEMS micro-scanner Electrostatic Micromachined Resonating Micro-Scanner for Circumferential Endoscopic Bio-Imaging MEMS Electrostatic Double T-Shaped Spring Mechanism for Circumferential Scanning Retinal Vascular Features in Ocular Blunt Trauma by Optical Coherence Tomography Angiography Non-invasive imaging of a choroidal macrovessel Correlation between optical coherence tomography, multifocal electroretinogram findings and visual acuity in diabetic macular edema Digital Wavefront Sensing Ciliary body length revisited by anterior segment optical coherence tomography: implications for safe access to the pars plana for intravitreal injections Evaluation of retinal vascular structure after epiretinal membrane surgery by optical coherence tomography angiography