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- W2022751697 abstract "K, you get the idea. In some ways, we are mired fi rmly in the past. In others, we are too readily embracing a new way of looking at things. Here we are, with a new look for the magazine and a new Editor, and I’m still writing. I’ve threatened to quit writing this column every now and again. Then the Diffusion Theory thing came up, and stoked the fi res for a bit. The “fi nal” column on that ended with a lament that today’s practitioners of NIR spectroscopy seem less and less interested in understanding what is going on theoretically. That column got more reader response than any other. (In all there were fi ve different folks, some who wrote multiple times.) Their notes ranged from brief to several pages. My favourite was from Andrew McGlone who wrote to cheer me up: “My colleagues and I have very much enjoyed your writings on theoretical matters as expressed in NIR news over the last year or two. Your approach to the subject of NIR has been clarifying, to put it mildly: little jargon, straight forward math and a satisfyingly intuitive feel that it is correct.” “Please continue your quest to illuminate fundamental understanding around the diffusion model.” And “Please keep us entertained!” So to keep Andrew entertained, here is the “straight skinny” on the diffusion model. First, let’s think about my favourite model: that of sheets. In Figure 1, you see an illustration that I’ve used before that shows how light can refl ect off either the external { Re } or internal { Rf } surfaces. In Figure 2, we see how the apparent coeffi cient, the one we will think the material has from measurements on scattering samples, changes with Re and Rf. The external refl ectance { Re } makes the line go clockwise; and the higher the Re, the lower the apparent absorption coeffi cient. This is because if a lot of the light doesn’t make it into the sheet, there is not ■ A New Era" @default.
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- W2022751697 date "2007-02-01" @default.
- W2022751697 modified "2023-09-27" @default.
- W2022751697 title "A New Era" @default.
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- W2022751697 doi "https://doi.org/10.1255/nirn.1006" @default.
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