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

Claim 20:
21. 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 first 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
determine vibration amplitude data for each of a second plurality of points on the surface; 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:
process the vibration phase data and the vibration amplitude data to generate maximum-spatial-derivative-of-displacement data, representative of a respective maximum absolute value, over a time period, of a first-order or a second-order spatial derivative of surface displacement, for each of a third plurality of points on the surface; and
process the maximum-spatial-derivative-of-displacement data to determine a property of the object, or generate graphical-representation data from the maximum-spatial-derivative-of-displacement data for outputting on a display device.