METHOD OF THERMAL NON-DESTRUCTIVE INSPECTION Russian patent published in 2005 - IPC

FIELD: non-destructive inspection.

SUBSTANCE: method is used for thermal non-destructive inspection of non-uniform structures. Density of thermal flow is created through fence to be inspected and its value q is measured at one of the surfaces (for example, onto internal surface - q_i). Temperatures of opposite surfaces T_oi and T_oe are also measured. Quality of object under control is determined from its resistance to heat transfer R_o according to relation of R_o= T_i-T_e/q= (T_i- T_oi)/q+ (T_oi -T_oe)/q+ ( T_oe- T_e)/q=R_i+R_c+R_o. Value of density of thermal flow is measured additionally at opposite surface (q_i). Values of densities of thermal flow q_o(t) and q_e(t) and temperatures of opposites surfaces as well as internal as external surfaces are measured periodically during time interval τ. Admissive error of measurement of thermal flow density (Δq_max) is specified. Moments of time τ₁, τ₂... τ_n are determined when values of flows at opposite surfaces are equal with error Δq≤ Δq_max,:/q_i(t)-q_e(t)/≤Δq_max. Density of thermal flows is kept to be measured till achieving difference in their values beyond limits of Δq_max. Moment t_c is selected from received moments of time where values of densities of thermal flows coincide with preset error Δq_max during longest time interval Δt_c. Quality of object is determined correspondingly to given relation for values q=q_i, q_e, T_oe, T_oi, T_i and T_e which were measured at moment t_o.

EFFECT: improved truth of determination of quality of tested fence.

3 dwg