This research is to extend Ziegler-Nichols based PID controller design method to the intelligent fuzzy PID controller design of a Scanning Probe Microscope (SPM) system, thus the relative stability can be reserved. In addition, one can see the hysteresis and parameters variation effects of the force actuator can be reduced. This improvement had been verified by practical implementation. Comparing the results with the design with the Ziegler-Nichols based PID controller, one can see that the proposed system is more robust.
Conventional bio-probes are produced on a silicon substrate, they are not only fragile but unable to dispose according to the profile of human body in a large area manner, and thus the contact resistance between probe and skin may be increased. Besides, the signal processing devices are required to improve both S/N ratio and impedance matching problems. This paper proposes a novel remote human health monitor and an active RFID tag with replaceable non-frangible probes and thin-film-transistor (TFT) amplifiers. The probes are made of bio-degradable polymer (photo resist) and covered with bio-compatible TiN. In addition, we use two pieces of double sides conducting tapes to connect both TFT amplifiers and probe modules. Thus the probe module can be replaced easily by peeling the used probe module away from the double sides conducting tapes to supply a new one. Since the tag is a flexible plastic substrate, e, g. PT, PET and PI, so the probes are easier to deploy and conform to the human body profile. In addition, the signal can be amplified by the TFT amplifier nearby to improve both S/N ratio and impedance matching. Thus the human health conditions can be remotely monitored by measuring various acupuncture impedances via the active RFID tag. The active RFID monitoring range is 15m by using 2.45 GHz ISM band, the probe resistance and parasitic capacitance are as 2735 Ω and 60.7 pf, respectively. Since the typical human acupuncture point resistance is about 40-120KΩ, thus the proposed device and system can be applied.
This paper integrated multi-domain knowledge of electronics, optics, control as well as precision measurement, and proposing a high resolution subdividing electronics module to the sinusoidal encoder output of a positioning motor, such that the module can not only be used as a counter for linear and/or angular measurements, but also subdivide the periods of the sinusoidal encoder signals up to 1600 times. From the results of experiment test it can be seen that the whole module is suitable for those applications requiring high-resolution encoder, nanometer measurement as well as fast data acquisition with phase tolerance of ± 45°.
The key point of this research is to use Linear Velocity Transducer (LVT) to detect the vertical velocity of the stylus probe for the inner-loop damping and transient control of a force actuator. This improvement has been verified by MATLAB simulation and practical implementation of a surface profiler to reduce the hysteresis effect of the force actuator.
This research proposes a wireless RFID-based thermal bubble accelerometer design, and relates more particularly for the technology to manufacture it on a flexible substrate. The key technology is to integrate both a thermal bubble accelerometer and a wireless RFID antenna on the same substrate, such that the accelerometer is very convenient for usage. In this paper we use xenon inert gas in the chamber with heavier molecular weight to increase the acceleration sensitivity instead of traditional air or carbon dioxide. On the other hand, the specific heat of xenon gas is also lower so that the bandwidth of the proposed accelerometer is larger and the power consumption is lower. In addition, the inner shape of the chamber is changed as hemisphere instead of rectangular type, comparisons are also made. We have seen that the sensitivity of the proposed design is better.
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