Method and apparatus for localized infrared spectrocopy and micro-tomography using a combination of thermal expansion and temperature change measurements

摘要

A method and a system for generating a high spatial resolution multi-dimensional image representing the chemical composition of a sample. Highly localized IR light is used to cause the heating and thermal expansion of the sample. Modulating this IR light will cause this effect to take place at various depths of the material. The method and system of the present invention are used to generate a chemical profile of the sample using a combination of: (i) measurements of the thermal expansion and temperature change caused by absorbing IR radiation together; and (ii) measurements of the thermal expansion properties and thermal properties (such as thermal diffusivity and conductivity) of sites on the surface of the sample and the material surrounding it.