8. New Technology Roots
A combined experimental and analytic approach to moisture diffusion analysis (MDA) has evolved in proof of principle form as a new instrument termed a moisture profilometer .. The objective in moisture profilometry is the quantitative analysis of the spatial distribution of moisture within composites and definition of localized internal stress fields. An electrolytic cell is utilized to record cumulative moisture evolution and moisture effusion rate. Variation of cell geometry accommodates either laboratory analysis of small composite damage control specimens or field inspection of limited surface area of composite structure in an area scanning mode. An important new aspect of moisture profilometry is calculation of the depth profile of moisture concentration from measurement of surface effusion and rate with time. Statistical estimation theory is applied to this problem and preliminary results indicate that concurrent calculations can generate moisture concentration profiles during the course of moisture effusion measurements. Results of initial instrument design and computational analysis will be demonstrated and discussed.
Kaelble, David H., "Wetometer for Measurement of Moisture in Composites" (1978). Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE, September 1976–June 1977. 61.