Fig. 5 Moisture and swelling gradients within Norway spruce growth rings at hygroscopic equilibrium. a) Average density profile ρ estimated from neutron measurements. b) and c) show the strain fields εTTand εRRmeasured with the optical setup of Fig. 4a (DIC) and directly estimated from the neutron radiographs (ANRC). Moisture content profiles were calculated: by using DIC d) and ARNC e) for both neutron radiograph registration and swelling strain estimation, and f) by using ANRC for radiograph registration and DIC for swelling strain estimation
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