Optical in-situ inspection system

A method for in-situ inspection of a gas turbine engine fan, comprising:

• positioning a sensor to capture images of a surface of at least one gas turbine engine fan blade;
• coupling a processor to the sensor, the processor configured to determine damage to the at least one gas turbine engine fan blade based on image analytics;
• wherein the processor performs operations comprising:
• receiving, by the processor, imaging data for the surface of the at least one gas turbine engine fan blade from the sensor;
• determining, by the processor, a rotational speed of the fan;
• and
• determining, by the processor, a fan synchronization;
• recording a segment of footage to perform a principal component analysis;
• performing the principal component analysis to create a list of dominant modes of a series of footage in the segment;
• projecting all the footage in the segment onto a leading order mode;
• and
• providing a frequency modulated sinusoidal time variation of coefficients plot, wherein each point on the plot of coefficients corresponds to a particular frame of the blade appearing in front of the sensor.