Patent ID: 11867582
Assignee: SINTEF TTO AS
Field: Measurement (Instruments)
Classification: CPC G  F | IPC F  G

Claim 11:
12. A washer strain measurement method comprising the steps of:
providing 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;
providing sound emitting means on the washer body outer peripheral surface;
providing sound detecting means on the washer body outer peripheral surface;
emitting a sound signal into the plate shaped washer body by the sound emitting means;
detecting a sound echo response of the sound signal, from the plate shaped washer body, by the sound detecting means; and
calculating a strain on the plate shaped washer body at least based on the sound echo response.