無線式三次元位置センサの試作

概要

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We developed wireless 3-D position sensor. Although we reported a wired position sensor, in order that the wire might affect movement of the sensor, we develop a wireless position sensor newly. For inspection of position measurement algorithm, we first developed a trial product of wireless capsule type sensor without regard to size. The position of the sensor was detected by using mutual induction. In order to maintain the electromotive force induced at secondary coils in the sensor constant, the current flowing into the primary coil was regulated using feedback control. The position of the sensor was measured stably using the feedback control, even when the sensor was relatively far from the primary coil. Induced electromotive forces are modulated to FM signals by using astable multivibrator and the FM signal is flowed into a living body directly with low current, and demodulated from electrode on body surface. The position of the sensor was determined from the current flowing into the primary coil. As a result of accuracy evaluation of the sensor in vitro, the error was 2.17±0.99 mm (Ave±S.D.) in a range of up to 1 m from the magnetic field generator. This sensor is applicable to medical capsule devices, such as capsule endoscope.
社団法人電気学会の論文
2004-07-01