Infrared IR-microscopy

Mapping Historically, mapping [11] was the first method used to acquire hyperspectral data cubes, in particular with Raman spectroscopy and infrared (IR) microscopy. The image is created pixel by pixel in a step-and-acquire mode A spectrum is measured at one point of the sample, and then the sample moves to the next measurement position and another spectrum is acquired. The process is iterative for all positions in the area that define the image. 

Infrared (IR) microscopy is similar to photoacoustic microscopy because it consists of a rastering laser beam and it measures the material s thermal properties. IR microscopy is, however, a transmission technique. An IR image of the side of the sample opposite the rastering laser is taken using an IR camera. Flaws in the body of the specimen interfere with the transmission of heat and are thus detected. IR microscopy is especially powerful for detecting undensified regions, inhomogeneities, and delaminations in laminar composites. 

Using time- and space-resolved infrared (IR) microscopy (IRM), from the in situ study of sorption uptake of a gas mixture by a big MOF single crystal (size > 50 pm, because of the wave length of IR), the mixed-gas adsorption isotherms and diffusion coefficients can be determined [43] (Fig. 16). 

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See also in sourсe #XX -- [ , , ]

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