1. A method of determining a physical property of a composite material, comprising: providing at least one of a composite material and a surfacing film; irradiating said at least one of a composite material and a surfacing film with near-infrared energy; detecting near-infrared energy reflected from said at least one of a composite material and a surfacing film; performing multivariate analysis on a spectrum of said near-infrared energy reflected from said at least one of a composite material and a surfacing film; providing at least one thermal effect standard; obtaining a correlation of a spectrum of near-infrared energy reflected from said at least one thermal effect standard and a residual strength of said at least one thermal effect standard; and quantifying a degree of heat effect to said at least one of a composite material and a surfacing film by comparing results of said multivariate analysis with said correlation.