Quantitative dental measurements by use of simultaneous frequency-domain laser infrared photothermal radiometry and luminescence.

摘要: Modulated (frequency-domain) infrared photothermal radiometry (PTR) is used as a dynamic quantitative dental inspection tool complementary to modulated luminescence (LM) quantify sound enamel or dentin. A high-spatial-resolution experimental imaging setup, which can provide simultaneous measurements of laser-induced PTR and LM signals from defects in teeth, has been developed. Following optical absorption laser photons, the setup monitor simultaneously independently nonradiative (optical-to-thermal) energy conversion by radiative deexcitation emission. The relaxation lifetimes (tau1, tau2) absorption, scattering, spectrally averaged emission coefficients (mu(alpha), mu(s), mu(IR)) are then determined with realistic three-dimensional models for turbid media followed multiparameter fits data. band values healthy respect these parameters be generated so an explicit criterion assessment and, future extension, facilitate diagnosis onset demineralization carious enamel.