Visualizing Chemistry

Visualizing Chemistry
Author: National Research Council
Publisher: National Academies Press
Total Pages: 222
Release: 2006-06-01
Genre: Science
ISBN: 030916463X

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Scientists and engineers have long relied on the power of imaging techniques to help see objects invisible to the naked eye, and thus, to advance scientific knowledge. These experts are constantly pushing the limits of technology in pursuit of chemical imagingâ€"the ability to visualize molecular structures and chemical composition in time and space as actual events unfoldâ€"from the smallest dimension of a biological system to the widest expanse of a distant galaxy. Chemical imaging has a variety of applications for almost every facet of our daily lives, ranging from medical diagnosis and treatment to the study and design of material properties in new products. In addition to highlighting advances in chemical imaging that could have the greatest impact on critical problems in science and technology, Visualizing Chemistry reviews the current state of chemical imaging technology, identifies promising future developments and their applications, and suggests a research and educational agenda to enable breakthrough improvements.

Imaging Spectroscopy: Fundamentals and Prospective Applications

Imaging Spectroscopy: Fundamentals and Prospective Applications
Author: F. Toselli
Publisher: Springer Science & Business Media
Total Pages: 284
Release: 1991-11-30
Genre: Technology & Engineering
ISBN: 9780792315353

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Based on the Lectures given during the Eurocourse on 'Imaging Spectroscopy: Fundamentals and Prospective Applications', held at the Joint Research Centre, Ispra, Italy, October 23-27, 1989

A Broadly Tunable Surface Plasmon-coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging

A Broadly Tunable Surface Plasmon-coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging
Author: Ajaykumar Zalavadia
Publisher:
Total Pages: 139
Release: 2018
Genre:
ISBN:

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Hyperspectral imaging is a set of techniques that has contributed to the study of advanced materials, pharmaceuticals, semiconductors, ceramics, polymers, biological specimens, and geological samples. Its use for remote sensing has advanced our understanding of agriculture, forestry, the Earth, environmental science, and the universe. The development of ultra-compact handheld hyperspectral imagers has been impeded by the scarcity of small widefield tunable wavelength filters. The widefield modality is preferred for handheld imaging applications in which image registration can be performed to counter scene shift caused by irregular user motions that would thwart scanning approaches. In the work presented here an electronically tunable widefield wavelength filter has been developed for hyperspectral imaging applications in the visible and near-infrared region. Conventional electronically tunable widefield imaging filter technologies include liquid crystal-based filters, acousto-optic tunable filters, and electronically tuned etalons; each having its own set of advantages and disadvantages. The construction of tunable filters is often complex and requires elaborate optical assemblies and electronic control circuits. I introduce in the work presented here is a novel widefield tunable filter, the surface plasmon coupled tunable filter (SPCTF), for visible and near infrared imaging. The SPCTF is based on surface plasmon coupling and has simple optical design that can be miniaturized without sacrificing performance. The SPCTF provides diffraction limited spatial resolution with a moderately narrow nominal passband (

Development of a High Resolution Wavelength Filter and a Spatially Multiplexed Raman Imaging System

Development of a High Resolution Wavelength Filter and a Spatially Multiplexed Raman Imaging System
Author: Rajesh Morampudi
Publisher:
Total Pages: 165
Release: 2014
Genre: Hadamard transform spectroscopy
ISBN:

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Chemical imaging and hyperspectral imaging modalities, which are non-destructive and non-invasive, are gaining a lot of interest in industrial and research fields. In particular, Raman spectroscopy and Raman hyperspectral imaging are rapidly becoming analytical methods of choice. High resolution and high fidelity Raman Imaging is challenging, however, due to the performance limitations of commercially available electronically tunable filters. The emphasis of my research has been to develop high resolution spectral filters and Raman imaging system for bio-materials. Raman scattering is commonly used for the nondestructive identification of minerals and polymers, as well as many other materials, and it is suitable for characterizing the degree of crystallinity, which can impart material properties such as piezoelectricity. Another type of inelastic scattering, Brillouin scattering, provides an indirect measure of sample elasticity and results from the interaction of light with time dependent optical density (refractive index) variations imparted by acoustic phonons. Achieving the necessary spectral resolution (bandwidth“1nm) to separate Rayleigh scattered light and Brillouin scattered light is challenging, and conventional grating monochromators are often replaced with a cascaded series of Fabry-Perot filters. Developing electronically tunable filters for Brillouin scattering is extremely challenging. A more recent technology, the virtually imaged phased array (VIPA), is capable of narrow passbands and high angular dispersion. As a part of this work generalized dispersion law for the VIPA, employing both anisotropic and isotropic dielectrics has been developed. Low light applications like Raman and Brillouin imaging techniques can take advantage of spatial multiplexing strategies in which the intensity of light from many pixel locations on the sample are detected simultaneously. Cyclic simplex matrices have been employed as encoding masks for binary state multiplexing applications and are employed in this work as part of the development of a multiplexed Hadamard transform Raman imaging system. The Hadamard transform Raman instrument utilizes an electro mechanically controllable digital micro-mirror device (DMD) as a spatial modulator. The result is a significant improvement in the signal-to-noise ratio of the Raman hyperspectral data which can enable faster acquisition times. In addition, correction methods have been developed to completely remove or reduce errors caused by photobleaching and stray cosmic radiation. In parallel with this work, novel signal processing and multivariate analyses have been investigated for the particularly challenging application of the Raman modality to biological samples. In particular, Raman markers have been identified using these methods to differentiate normal retinal tissue from glaucomatous tissue in mice. Glaucoma is a major neurodegenerative disease that often leads to irreversible vision loss. Its early detection relies on new analytical methods, such as Raman spectroscopy and Raman imaging that can reveal early biochemical changes associated with its onset.

Spectral Imaging

Spectral Imaging
Author:
Publisher:
Total Pages: 176
Release: 2000
Genre: Diagnostic imaging
ISBN:

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Advances in Chemical Imaging

Advances in Chemical Imaging
Author: Weinstein Joshua A.
Publisher:
Total Pages:
Release: 2021-12
Genre:
ISBN: 9781649972620

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