FIELD: wood microwave radiation drying. SUBSTANCE: lumber is laid in horizontal rows at clearances between boards or bars; rows are laid through spacers, after which lumber stack is subjected to microwave radiation from one or two opposite sides. Clearances between boards or bars in rows and distances between rows in levels is less than Λ/4 of length of wave of microwave radiation. Stack surfaces are subjected to radiation at Brewster's angle (Q) at polarization of radiation parallel to plane of incidence perpendicular to surface being subjected to radiation; magnitude of angle Q is found from the following formula: 
, where ε is dielectric permittivity of wood; Vair is volume of air in stack; Vstack is volume of stack known magnitude ε. If this magnitude is not known, one surface of stack is subjected to radiation at angle of incidence within 50 to 70 deg. of circle with polarization parallel to plane of incidence perpendicular to stack surface subjected to radiation taking the radiations of the same polarization reflected from the surface being subjected to radiation at negative magnitude of the same angle; absolute magnitude of angle of radiation and reception in the interval indicated are changed trying to obtain minimum (zero) magnitude of intensity of reflected radiation during the entire period of drying. EFFECT: increased rate of drying due to reduction of microwave radiation from lumber stack. 5 cl, 7 dwg
