CPC G01L 5/243 (2013.01) [F16B 31/028 (2013.01); G01L 5/246 (2013.01); G01N 29/12 (2013.01); G01N 29/343 (2013.01); F16B 2031/022 (2013.01); G01N 29/07 (2013.01); G01N 29/326 (2013.01); G01N 2291/044 (2013.01)] | 20 Claims |
1. A strain measuring washer assembly comprising:
a plate shaped washer body, at least provided with a washer body central opening extending through the plate shaped washer body, a washer body outer peripheral surface, and a closed internal cavity surrounding the washer body central opening;
sound emitting means, positioned on the washer body outer peripheral surface and configured to emit a sound signal into the plate shaped washer body; and
sound detecting means positioned on the washer body outer peripheral surface and configured to detect an echo response of the sound signal from the plate shaped washer body.
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