GS0328 発振回路法を用いたひずみセンシングにおけるサンプリング周波数向上に関する検討

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  • GS0328 Improvement of Sampling Frequency on Strain Measurement using Oscillator Circuit

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The strain measurement method using a CMOS inverter oscillator circuit including a strain gage is simple and can reduce amplifiers, filters, and A/D converters, because the circuit output, oscillating frequency which relates with resistance changes of a strain gage are measured by a simple pulse counting device. However, the sampling frequency is low (more than 1 second) in this method because this method has used the direct counting method for downsizing and simplifying of the measurement system. In this report, the improvement of the sampling frequency using the reciprocal counting method was proposed and studied. We manufactured a frequency adjusting circuit for reciprocal method. It was shown that, although greatly affected by the contact resistance the sampling frequency was improved to 196Hz.

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