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Solving Three Key Problems of the SAW Yarn Tension Sensor

In this brief, we propose to implement a new method of the yarn tension sensor with a surface acoustic wave (SAW) oscillator. When the yarn tension is subjected to the piezoelectric substrate of SAW oscillator, the oscillation frequency of SAW oscillator varies with yarn tension so that the goal of measuring yarn tension is reached. We present the temperature compensation of the SAW yarn tension sensor, establishment of the functional relationship between the yarn tension and the output frequency shift of the yarn tension sensor, and suppression of the sidelobes for the frequency characteristic curve of the SAW oscillator as the three key problems of the SAW yarn tension sensor. The solutions to these problems are achieved in this brief.