A new technique to quantify the rate of change of craze density in stressed transparent polymeric plates of polycarbonate was developed. The samples are placed under a creep load in a controlled temperature and humidity environment, during which the craze density is measured with a reflective imaging system at a defined rate. It has been shown that this unique method for craze detection and quantification has sufficient repeatability to generate statistically acceptable data, obeying well-established trends in craze behavior. Unlike the bulk of the craze detectors currently used, the method described in the present work is an in-situ, quantitative, non-subjective, direct measurement of craze density.