微小コイルを使った力検出器開発の基礎的研究(機械工学科)

概要

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In this paper, a new non-contacting strain sensing method using iterative phase difference detection is proposed. Proposed method, applying an iteration algorithm to phase difference detection, is characterized as a simple sensor which consists of very small size coils, oscillator circuits, and a microprocessor. The phase difference detection by the synchronous detection, especially the lock-in amplifier, has been used to sense the small inductance change for a long time. The new method proposed in this paper will be equivalently the synchronous detection technique, in which the lock-in amplifier is needless. In order to detect the phase difference accurately, the repetitive accumulation of the phase of sensor output signal, in time domain, is need to be carried out in this method. Using the small size coil, it will be able to reduce the influence of material's temperature gradient. It will be shown that strain caused by applied force can be detected accurately by some experimental data in this paper.