Patent ID: 11867611
Assignee: OPTONOR AS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method of analysing an object, comprising:
exciting the object at a vibration frequency so as to induce a stationary or travelling wave, having the vibration frequency, on a surface of the object;
using optical interference to determine vibration phase data for each of a plurality of points on the surface, the vibration phase data representing, for each point, a respective phase, relative to a common reference phase, of the stationary or travelling wave;
applying a digital spatial-derivative filter to the vibration phase data to generate spatial-derivative-of-phase data representative of spatial changes in vibration phase across the surface; and
processing the spatial-derivative-of-phase data to determine a property of the object, or outputting a graphical representation of the spatial-derivative-of-phase data on a display device.