System and non-contact method for measuring vibration on surface of an object

A non-contact method for measuring vibration on a surface of an object, comprising:

• projecting light from three light sources towards a point of interest on a surface of an object, where the light projected from the three light sources is coherent;
• detecting the light reflected by the point of interest on the surface using three detectors, where each detector of the three detectors captures light from a corresponding one of the three light sources;
• from the light captured by the three detectors, calculating, by a processor, vertical displacement of the surface at the point of interest using triangulation, where the processor is interfaced with each of the three detectors;
• from the light captured by the three detectors, calculating, by the processor, rotational displacement of the surface at the point of interest about an x axis using triangulation;
• and
• from the light captured by the three detectors, calculating, by the processor, rotational displacement of the surface at the point of interest about y axis using triangulation, where the x axis and the y axis define a plane which is parallel to surface of the object.

A system for measuring vibration on a surface of an object, comprising:

• a first light source configured to project light along a first projection axis towards a point of interest on a surface of an object;
• a first light detector configured to detect light primarily from the first light source, where the light is reflected by the point of interest on the surface;
• a second light source configured to project light along a second projection axis towards the point of interest on the surface of the object;
• a second light detector configured to detect light primarily from the second light source, where the light is reflected by the point of interest on the surface;
• a third light source configured to project light along a projection axis towards the point of interest on the surface of the object;
• a third light detector configured to detect light primarily from the third light source, where the light is reflected by the point of interest on the surface;
• and
• a processor in data communication with the first light detector, the second light detector and the third light detector, wherein the processor determines a change in position of the reflected light detected by at least one of the first light detector, the second light detector or the third light detector, and calculates a vertical displacement of the surface at the point of interest from the change in position using triangulation.