04-05-2017 дата публикации
Номер: US20170122810A1
Принадлежит:
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 (); evaluating the detected thermal radiation based on a range defined by the following equations model: 1. A method for the photothermic investigation of a sample comprising the steps of:a) Irradiating a first side of the sample with an electromagnetic excitation pulse,b) Detecting a thermal radiation emitted from a second side of the sample located opposite the first side as a result of the excitation pulse, [{'br': None, 'sup': 2', '2, 'i': T/αx', 'T/αt', 'x, 'α=1/α×αfor 0<0'}, {'br': None, 'i': k×αT/αx−h×T=−E', 't', 'T', 't', 'T', 'L,t', 'x=', 't>, '()+η′×((0,)−()) for 0, 0'}, {'br': None, 'i': k×αT/αx+h×T', 'T', 't', 'T', 'L,t', 'x=L, t>, '=−η′×((0,)−()) for 0'}, {'br': None, 'i': T', 'x,', 't=, '(0)=0 for 0,'}], 'c) Evaluating the detected thermal radiation on the basis of a model, which is defined by the following equationswherein:T identifies the (location and time-dependent) temperature of the sample,L identifies the thickness of the sample,x identifies the spatial coordinate viewed in thickness direction of the sample, with x=0 on the first side of the sample and x=L on the second side of the sample,t identifies the time with t=0 at the time of the excitation pulse,E(t) identifies the (time-dependent) irradiation current density of the excitation pulse,α identifies the temperature conductivity of the sample,k identifies the heat conductivity of the sample,h identifies the heat transfer coefficient on the sample surfaces,η′ identifies an “overall transparency factor”,wherein a mathematical equalizing calculation is carried out so as to estimate one or a plurality of the afore-mentioned parameters α, k, h, η′ and/or parameters derived therefrom (h/k or L×h/k, e.g., ...
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