IEEJ Transactions on Sensors and Micromachines
Online ISSN : 1347-5525
Print ISSN : 1341-8939
ISSN-L : 1341-8939
Volume 122, Issue 3
Displaying 1-8 of 8 articles from this issue
Paper
  • Hitoshi Takano, Yuka Kitamura, Masahiro Akiya
    Article type: Others
    Subject area: Others
    2002 Volume 122 Issue 3 Pages 127-132
    Published: 2002
    Released on J-STAGE: March 28, 2003
    JOURNAL FREE ACCESS
    A taste sensor with polyion-complex LB films deposited on a silver electrode is described. Di OctaDecyl dimethyl Ammonium Bromide (DOABr) was used as a sensing film and Chondroitin A Sodium Salt (Chondroitin) and Potassium Polyvinyl Sulfate (PVSK) was also used as an under layer. Sensor response was improved by these different polymers. The parameters such as maximum membrane potential and response time obtained by dripping taste solutions, and more combination of dripping characteristics could discriminate clearly five basic substances.
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  • Takashi Araki, Hisao Ono
    Article type: Others
    Subject area: Others
    2002 Volume 122 Issue 3 Pages 133-138
    Published: 2002
    Released on J-STAGE: March 28, 2003
    JOURNAL FREE ACCESS
    This paper describes the development of the instrument which is used to detect the traffic of the car by the flux-gate magnetometer. The variation of the magnetic field intensity of the car is observed by using a flux-gate magnetometer which is set beside a road. It is found out that the variation of the magnetic field intensity of the large vehicles is bigger than the small vehicles by ten times. The variations of the magnetic field intensity of the vehicles (large vehicles and small vehicles ) are estimated with the computer-based simulation. Comparison with the car traffic measured by the automatic measurement, and the usual visual observation was done. It is almost the same is the total traffic though there are some differences in the traffic by the large vehicle and the small vehicle. The traffic can be precisely measured if threshold value is adjusted to the appropriate value.
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  • Masanori Hayase, Takamasa Hatano, Takeshi Hatsuzawa
    Article type: Others
    Subject area: Others
    2002 Volume 122 Issue 3 Pages 139-143
    Published: 2002
    Released on J-STAGE: March 28, 2003
    JOURNAL FREE ACCESS
    Implantable encoder for angle or position detection is one of the most required devices especially in the medical field. Power source and connecting wires are necessary for conventional optical or magnetic type encoders. Because direct connection from the implant devices to outside devices causes necrosis around the wiring points on skin, it is difficult to apply those conventional method to implantable devices. In this study, new remote rotary and linear encoders, which consist of an LC circuit with a loop type coil and a parallel-plate capacitor, are proposed. In this system, the capacitance of the parallel-plate capacitor varies with rotation or displacement, and the change of the resonant frequency is remotely measured by a dip meter. A method for linearization of resonant frequency to displacement is also developed. Several experiments with trial devices show validity of the encoder system.
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  • Masashi Nakata, Kazuyoshi Fushinobu, Ken Okazaki
    Article type: Others
    Subject area: Others
    2002 Volume 122 Issue 3 Pages 144-149
    Published: 2002
    Released on J-STAGE: March 28, 2003
    JOURNAL FREE ACCESS
    Recovery of stiction-failed micro-cantilevers with excimer laser irradiation has been attempted on silicon oxide cantilevers. Micro-cantilevers with various lengths and widths have been fabricated from thermo-oxidized silicon with micromachining process. ArF laser (λ=193nm) and KrF laser (λ=248nm) were used for experiments. Laser stiction recovery is possible on micro-cantilevers made of silicon oxide. Recovery yield is dependent on laser fluence and wavelength. ArF laser light, which is well absorbed by silicon oxide, can recover stiction-failed cantilevers more effectively. Adhesion and stiction-recovery do not depend on the width of cantilever. The results are compared with previous data of silicon cantilevers. Using the model that considers the sum of elastic force and thermoelastic force as restoring force, the free standing yield after laser irradiation is calculated. The theoretical results exhibit qualitative agreement with the experimental data of both silicon oxide and silicon cantilevers. This indicates that the thermoelastic force plays an important role in stiction recovery, and its temporal profile may have an influence on the recovery yield.
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  • Masahiro Matsumoto, Satoshi Shimada, Fumio Murabayashi, Hiromichi Yama ...
    Article type: Others
    Subject area: Others
    2002 Volume 122 Issue 3 Pages 150-157
    Published: 2002
    Released on J-STAGE: March 28, 2003
    JOURNAL FREE ACCESS
    We have developed a signal conditioning LSI which consists of a sigma delta AD converter, sigma delta DA converter, DSP and PROM. The AD converter of the LSI is able to directly digitize input signal from the sensor element with a swing less than 10mV with 1μV resolution. Therefore no preamplifier for adjusting the input signal from the sensor element to the AD conversion range is needed. The DSP is able to start up without a reset signal, though it is a stored program type signal processor. The sensing system using this DSP has no external parts, power on reset circuit, watch dog timer. The LSI have been integrated in a 0.8μm CMOS process and its chip is 4.3mm × 4.7mm.
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  • Wataru Mitsuhashi, Hiroki Nitta, Noboru Okajima
    Article type: Others
    Subject area: Others
    2002 Volume 122 Issue 3 Pages 158-165
    Published: 2002
    Released on J-STAGE: March 28, 2003
    JOURNAL FREE ACCESS
    A new visual method with log-polar imaging geometry is proposed for tracking an object that translates in three dimensional space. The log-polar mapping is a popular model for space-variant sensing in computer vision, and is efficient in data reduction so that a tracking system can work with real time operation. An active camera with three degree of freedom (pan, tilt and zoom) is used to track the object and the log-polar mapping of images is performed with software computation, in which we can change the conversion parameters. In the log-polar coordinates, the lateral component of the object’s translation varies sinusoidally, while the longitudinal motion component along the visual axis is reduced to rather simpler translation. These motion components can be estimated in sub-pixel order of accuracy by detecting the phase difference of the complex wavelet transforms of the converted image sequences. By using a commercially available PC without additional peripheral equipment, the pursuit of a moving planar object can be executed in the rate of 10 or 15 frames/sec.
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  • Shoji Kawahito, Kazuaki Sawada, Koji Tada, Makoto Ishida, Yoshiaki Tad ...
    Article type: Others
    Subject area: Others
    2002 Volume 122 Issue 3 Pages 166-171
    Published: 2002
    Released on J-STAGE: March 28, 2003
    JOURNAL FREE ACCESS
    This paper presents an improved method of image reconstruction from the chopperless pyroelectric infrared image sensors. In the chopperless image sensor using chip shift operation, the output is a spatially differentiated image. The original IR light image can be reconstructed from the sensor output using the spatial integration. The improved method uses the chip shift operations to both x and y direction to cancel the stripe shape noise. This technique much improves the quality of the reconstructed image.
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  • Akira Yamaguchi, Hiroshi Tsuchiyama, Shigeki Matsuo, Junichi Yokoyama, ...
    Article type: Others
    Subject area: Others
    2002 Volume 122 Issue 3 Pages 172-178
    Published: 2002
    Released on J-STAGE: March 28, 2003
    JOURNAL FREE ACCESS
    Several bonding techniques for the development of microchannel chip at room temperature were studied. An electrostatic interaction between poly-ion layers with opposite charge and a condensation of silane coupling agent was employed to bond two glass substrates. In former case, the bonding of the substrates was achieved by applying high electrical potential. On the other hand, the condensation of silane coupling agent could bond the two glass substrates at room temperature and atmosphere. It was confirmed that the microchannel developed using the silane coupling agent could work for flow channel without solution leak. Poly(dimethylsiloxane)(PDMS) substrate was also applied for chip development. As a result, it was confirmed that PDMS was a material for easy and rapid fabrication of microchannel chip integrated with film electrodes
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