IEEJ Transactions on Sensors and Micromachines
Online ISSN : 1347-5525
Print ISSN : 1341-8939
ISSN-L : 1341-8939
Volume 127, Issue 5
Displaying 1-6 of 6 articles from this issue
Special Issue on “Sensor Symposium 2”
Special Issue Paper
  • Rikiya Tanabe, Seiichi Hata, Akira Shimokohbe
    2007 Volume 127 Issue 5 Pages 267-271
    Published: May 01, 2007
    Released on J-STAGE: August 01, 2007
    JOURNAL FREE ACCESS
    To develop a miniature complete blood count (CBC) analyzer for point-of-care testing (POCT), a disposable MEMS hemoglobin and volume measurement sensor was discussed. The light emitting diode (LED) and photo detector were arranged in the mainframe to allow repeated use. However, the fluidic path, optical cell, and optical waveguides with quartz optical fiber (φ250μm) were arranged in the MEMS disposable chip. The sensors were fabricated successfully using an SU-8 photolithography process. The proposed volume measurement sensor was shown to detect the presence of sample liquid at two locations with a single light source and photo detector. The hemoglobin concentration sensor provided good linearity in the range of normal physiological values to decreased values requiring immediate care. The new MEMS hemoglobin and volume measurement sensor demonstrated potential application as a miniature CBC analyzer.
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Paper
  • Takeshi Nakaya, Masato Date, Rui Tezuka, Akihiko Sugiura
    2007 Volume 127 Issue 5 Pages 272-283
    Published: May 01, 2007
    Released on J-STAGE: August 01, 2007
    JOURNAL FREE ACCESS
    We examine an application of weighted transmission to restrain an occurrence of fatal error for compressed image sequence in CDMA. At first, we do weighted transmission to make a different channel of bit error performance. In weighting method, we examine a signal amplitude method and a decision by majority method. Next, we apply weighted transmission to MPEG image sequence. We quantified the level of importance of image sequence and transmit based on it. As a result, we confirmed that the weighted transmission is better quality of compressed image sequence than conventional method.
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  • Yoshihiro Yasumuro, Tadao Sugiura, Osamu Oshiro, Kunihiro Chihara
    2007 Volume 127 Issue 5 Pages 284-289
    Published: May 01, 2007
    Released on J-STAGE: August 01, 2007
    JOURNAL FREE ACCESS
    This paper describes a fabrication scheme for integrating an optical fiber-delivered catheter for ultrasound (US) imaging. In this catheter, pulsed laser is focused and guided into a tapered optical fiber. The laser passes through the fiber and is refocused to generate laser-induced breakdown (LIB), which emits spherical pulsed US wave. The reflected US waves are received with a hydrophone array to reconstruct 3D images with synthetic aperture method. We examined the probability of LIB generation relative to pulsed energy level for stably producing US pulses and clarified a suitable specification for a laser delivering fiber. Proto-type catheter demonstrated real-time 3D imaging, in which LIB is continuously generated on the tip of the catheter and frontal situation is captured in 3D images in realtime process.
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  • Wei Quan, Katsunori Shida
    2007 Volume 127 Issue 5 Pages 290-296
    Published: May 01, 2007
    Released on J-STAGE: August 01, 2007
    JOURNAL FREE ACCESS
    A sphere-shape angular position sensor for measurement inclination angle and inclined direction simultaneously based on multifunctional sensing approach is proposed, which is characterized in the following respects, such as the measurement of two angles, a full-range measurement, and has a compact and single structure. Three coils wound on the surface of a plastic ball with half sphere compose three inductances as the outputs of sensor. Magnetic fluid is selected as the inertial element attributed to its liquidity and electromagnetism character. We herein discuss the working principle of the sensor, its detailed configuration and its geometrical analysis. A prototype is built, the measuring results of which examines the feasibility of proposed method. Two angular parameters are successfully evaluated by using 2-D cubic spline interpolation.
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  • Michihiko Nishigaki, Toshihiko Nagano, Kazuhide Abe, Kazuhiko Itaya, T ...
    2007 Volume 127 Issue 5 Pages 297-302
    Published: May 01, 2007
    Released on J-STAGE: August 01, 2007
    JOURNAL FREE ACCESS
    Piezoelectric RF-MEMS tunable capacitors are useful components for realizing reconfigurable RF circuits for multi-band mobile terminals. In this paper, we describe fabrication process of an AlN RF-MEMS tunable capacitor and electrical characteristics of the tunable capacitor. We chose AlN as piezoelectric material and Al as electrode material, because these materials are compatible with conventional CMOS processes. The tunable capacitor utilized the piezoelectric bimorph actuator with folded beam structure. The structure of the actuator can cancel curling of the beam due to residual stress of the AlN piezoelectric actuator. After subtraction of parasitic components, net capacitance of the tunable capacitor changed from 0.20pF to 0.51pF with drive voltage ranging from 0V to 8V. The tuning ratio was 2.6. Q factor of the capacitor varied 29 to 11 at the same voltage range.
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