http://www.spectroscopy-nir.info NIR Mon, 14 Jul 2008 11:02:47 +0000 http://backend.userland.com/rss092 en DRAMIŃSKI NIR-DRAM 100 - Near Infra Red Analyser of grain and flour content The analyser is an advanced hi-tech device for measuring grain & flour composition by spectral analysis in the near-infrared spectral range. http://www.spectroscopy-nir.info/best-producer-of-nir-analyser/ NIR spectroscopy is the measurement of absorbed light directed on a sample in the wavelength region of 780 to 2500 nm. A non-destructive method of molecular analysis, NIR spectroscopy provides excellent quantitative data and requires little-to-no sample preparation. Some organic compounds, which tend to have complex band structures in this ... http://www.spectroscopy-nir.info/nir-spectroscopy/ The NIR instrument is not “calibrated” like a balance where the readings are merely adjusted up or down to a standard value. The instrument has to be trained to recognise different products and constituents. This process of “training” is called the calibration procedure and herein lies the secret of success of ... http://www.spectroscopy-nir.info/calibrations/ The scattered reflected and/or transmitted rays of each wavelength are concentrated onto a measuring cell. A number of reflections at different wavelengths are measured and then converted to analytical results by a microprocessor. There is often a misunderstanding of the term NIR Reflectance. The rays are not merely reflected from the ... http://www.spectroscopy-nir.info/nir-rays-absorbed-by-some-bonds-reflected-by-other-bonds-nir-reflectance-or-transmitted-through-a-sample-nir-transmission-generally-termed-nit/ The word “spectroscopy” is derived from the Latin root spectrum (appearance, image) and the Greek word skopia (to view). This definition is rather descriptive of the spectroscopic measurement itself i.e. to view a light image coming from a specimen (Miller, 2001). In essence, NIR technology involves light interacting with matter where ... http://www.spectroscopy-nir.info/theory-of-nir-spectroscopy/ On the other hand, what would happen if we tried to reverse this process? That is, what would happen if we fired this special photon back into a ground state atom? That's right, the atom could absorb that `specially-energetic' photon and would become excited, jumping from the ground state to ... http://www.spectroscopy-nir.info/absorption-line-spectra/ Unlike a continuous spectrum source, which can have any energy it wants (all you have to do is change the temperature), the electron clouds surrounding the nuclei of atoms can have only very specific energies dictated by quantum mechanics. Each element on the periodic table has its own set of ... http://www.spectroscopy-nir.info/emission-line-spectra/ Discrete spectra are the observable result of the physics of atoms. There are two types of discrete spectra, emission (bright line spectra) and absorption (dark line spectra). Let's try to understand where these two types of discrete spectra. http://www.spectroscopy-nir.info/discrete-spectra/ Continuous spectra arise from dense gases or solid objects which radiate their heat away through the production of light. Such objects emit light over a broad range of wavelengths, thus the apparent spectrum seems smooth and continuous. Stars emit light in a predominantly (but not completely!) continuous spectrum. Other examples ... http://www.spectroscopy-nir.info/continuous-spectra/ Typically one can observe two distinctive classes of spectra: continous and discrete. For a continuous spectrum, the light is composed of a wide, continuous range of colors (energies). With discrete spectra, one sees only bright or dark lines at very distinct and sharply-defined colors (energies). As we'll discover shortly, discrete ... http://www.spectroscopy-nir.info/general-types-of-spectra/