Abstract: A method for photothermal investigation of a sample (P), including: irradiating a first side of the sample (P) with an electromagnetic excitation pulse; detecting a result of the excitation pulse of one of the first side opposite second side of the sample (P) emitted thermal radiation (26); evaluating the detected thermal radiation based on a range defined by the following equations model: ?2T/?x2=1/?×?T/?t for 0<x<L, t>0 k×?T/?x?h×T=E(t)+??×(T(0,t)?T(L,t)) for x=0, t>0 k×?T/?x+h×d=???×(T(0,t)?T(L,t)) for x=L, t>0 T(x,0)=0 for t=0.

Abstract: A system for measuring the thermal diffusivity of a material includes a housing having an upper portion and a lower portion, a plate holding the material in a fixed position between the upper portion and lower portion of the housing, and a source at the lower portion of the housing projecting heat onto the material along a first axis that is perpendicular to the plate. A sensor at the lower portion of the housing is movable in relation to the plate and senses the heat radiating through the material along a second axis that is perpendicular to the plate and offset from the first axis. A controller receives data from the sensor and calculates the thermal diffusivity of the material.

Abstract: A method for photothermal investigation of a sample (P), including: irradiating a first side of the sample (P) with an electromagnetic excitation pulse; detecting a result of the excitation pulse of one of the first side opposite second side of the sample (P) emitted thermal radiation (26); evaluating the detected thermal radiation based on a range defined by the following equations model: ?2T/?x2=1/?×?T/?t for 0<x<L, t>0 k×?T/?x?h×T=E(t)+??×(T(0,t)?T(L,t)) for x=0, t>0 k×?T/?x+h×d=???×(T(0,t)?T(L,t)) for x=L, t>0 T(x,0)=0 for t=0.

Abstract: A system for measuring the thermal diffusivity of a material includes a housing having an upper portion and a lower portion, a plate holding the material in a fixed position between the upper portion and lower portion of the housing, and a source at the lower portion of the housing projecting heat onto the material along a first axis that is perpendicular to the plate. A sensor at the lower portion of the housing is movable in relation to the plate and senses the heat radiating through the material along a second axis that is perpendicular to the plate and offset from the first axis. A controller receives data from the sensor and calculates the thermal diffusivity of the material.