Point measurement of absorptivity of 30CrMnSiA steel at different temperature in atmosphere

Based on integrating sphere absolute method,temperature-dependent absorptivity of 30CrMnSiA carbon steel was measured with heating laser beam(λ=1064nm) and probing laser beam (λ=1319nm) irradiating on material surface in atmosphere environment at the same time.With the probing laser incident at zero and thirty degrees,the absorptivity of the steel was measured at the temperature range from the room temperature to melting point.It was 0.4 at room temperature and 0.9 at melting point.The results show that temperature has important effect on the absorptivity of 30CrMnSiA carbon steel in atmosphere environment,however the incidence angle hasn't any effect on absorptivity.