1. A method of determining moisture content of a resin-fiber composite material, comprising: providing solid resin-fiber composite material standards with moisture content; collecting at least one of broad-band near and mid-spectrum infrared spectra of infrared energy reflected from said resin-fiber composite material standards, said spectra are within the infrared spectra range only; calibrating said infrared spectra to said moisture content; providing a solid resin-fiber composite material; collecting said infrared spectra from said composite material; predicting moisture content of said composite material based on said infrared spectra and said composite material standards; and, quantitatively predicting a mechanical property of said composite material based on said predicted value of said moisture content of said composite material.