Transmission Spectroscopy Analysis
Transmission Spectroscopy Analysis - Related Videos
09:26
Raman Spectroscopy for Chemical Analysis
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2023
Source: Laboratory of Dr. Ryoichi Ishihara — Delft University of Technology Raman spectroscopy is a technique for analyzing vibrational and other low frequency modes in a system. In chemistry it is used to identify molecules by their Raman fingerprint. In solid-state physics it is used to characterize materials, and more specifically to investigate their crystal structure or crystallinity. Compared to other techniques for investigating the crystal structure (e.g. transmission electron...
09:40
Lead Analysis of Soil Using Atomic Absorption Spectroscopy
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Lead occurs naturally in soil, in levels ranging from 10-50 ppm. However, with the widespread use of lead in paint and gasoline in addition to contamination by industry, urban soils often have concentrations of lead significantly greater than background levels – up to 10,000 ppm in some places. Ongoing problems arise from the fact that lead does not biodegrade, and instead remains in the soil. Serious health risks...
02:53
Ultrastructural Analysis of a Mouse Brain Section Using Transmission Electron Microscopy
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2025
Source: Lutz, D., et.al. Assessment of Ultrastructural Neuroplasticity Parameters After In Utero Transduction of the Developing Mouse Brain and Spinal Cord. J. Vis. Exp. (2019).This video demonstrates the preparation and transmission electron microscopy (TEM) analysis of a brain section from a mouse pup. The protocol starts with osmium tetroxide-fixed tissue embedded in resin, followed by precise trimming to isolate the region of interest and ultramicrotomy to produce semithin and ultrathin...
09:21
Mössbauer Spectroscopy
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2023
Source: Joshua Wofford, Tamara M. Powers, Department of Chemistry, Texas A&M University Mössbauer spectroscopy is a bulk characterization technique that examines the nuclear excitation of an atom by gamma rays in the solid state. The resulting Mössbauer spectrum provides information about the oxidation state, spin state, and electronic environment around the target atom, which, in combination, gives evidence about the electronic structure and ligand arrangement (geometry) of the molecule.
01:15
Design of Transmission Shafts - Stress Analysis
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2024
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
FAQs
Under suitable conditions, absorbance can be related to a sample’s concentration, path length, and attenuation through the Beer–Lambert law. This relationship gives the measured spectrum a quantitative interpretation rather than treating absorption bands only as visual features. Engineers can therefore use spectral measurements to estimate composition when those controlling quantities are relevant to the sample.
Absorption bands mark wavelength regions where the sample attenuates incident electromagnetic radiation more strongly. Their positions and overall pattern can reveal optical and chemical properties, helping distinguish behaviors among thin films, polymers, glass, coatings, semiconductors, and gases. Interpreting these features supports composition assessment and links spectral response to material performance.
Transmittance describes the fraction of incident radiation that passes through a sample, while absorbance expresses the corresponding attenuation in a form useful for interpretation. Examining either measure across wavelengths can expose spectral features, but absorbance is especially relevant when applying the Beer–Lambert relationship to concentration, path length, and sample attenuation.
A practical measurement compares incident intensity with the intensity recorded after radiation passes through the sample across selected wavelengths. The instrument uses this comparison to obtain transmittance or absorbance for subsequent interpretation. Recording the sample’s path length and considering its attenuation are important when the results will support Beer–Lambert-based estimates of concentration or composition.
Transmission spectroscopy analysis can characterize thin films, polymers, glass, coatings, semiconductors, and gases. The same measurement approach can support different goals across these material classes, including identifying absorption bands, estimating composition, and evaluating optical performance. This breadth makes it useful for comparing engineered materials whose transmission behavior affects sensing, photonics, energy, or communications components.
Engineers apply the measurements to monitor fabrication processes, assess defects, and evaluate whether a material meets intended optical requirements. Spectral results can also guide component design by showing how materials interact with selected wavelengths. These uses connect laboratory characterization with practical development in sensing, photonics, energy, and communications.