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

Claim 13:
14. A system for analysing an object, comprising:
an optical-interference-based measurement apparatus configured to use optical interference to determine vibration phase data for each of a plurality of points on a surface of an object that is vibrating at a vibration frequency such that a stationary or travelling wave, having the vibration frequency, is present on the surface of the object, the vibration phase data representing, for each point, a respective phase, relative to a common reference phase, of the stationary or travelling wave; and
a processing system comprising hardware logic and/or comprising a processor and a memory storing software instructions for execution by the processor, wherein the processing system is configured to:
apply 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
process the spatial-derivative-of-phase data to determine a property of the object, or generate graphical-representation data from the spatial-derivative-of-phase data for outputting on a display device.