Download or read book Spatial Heterodyne Spectroscopy written by John M. Harlander and published by . This book was released on 1991 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spatial Heterodyne Spectroscopy written by Cara P. Perkins and published by . This book was released on 2013 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This work presents a radiometric model of a spatial heterodyne spectrometer (SHS) and a corresponding interferogram-processing algorithm for the calculation of calibrated spectral radiance measurements. The SHS relies on Fourier Transform Spectroscopy (FTS) principles, and shares design similarities with the Michelson Interferometer. The advantages of the SHS design, including the lack of moving parts, high throughput, and instantaneous spectral measurements, make it suitable as a field-deployable instrument. Operating in the long-wave infrared (LWIR), the imaging SHS design example included provides the capability of performing chemical detection based on reflectance and emissivity properties of surfaces of organic compounds. This LWIR SHS model takes into account the instruments entrance optics, interferometer, exit optics, and detection scheme to output realistic, interferometric data. The model serves as a tool to find the optimal SHS design parameters for the desired performance requirements and system application. It also assists in the data analysis and system characterization. The interferogram-processing algorithm performs flat-fielding and phase corrections as well as apodization before recovering the measured spectral radiance from the recorded interferogram via the Inverse Fourier Transform (IFT). The model and processing algorithm are tested with a variety of spectra and the results are comparable to those in the literature with a noise-equivalent change in temperature of 0.2K. These results demonstrate the model's validity and the algorithm's performance. Additional experiments show the algorithm's real-time processing capability, indicating the LWIR SHS system presented is feasible."--Abstract.

Download or read book Spatial Heterodyne Spectroscopy written by John Mark Harlander and published by . This book was released on 2006 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tunable Reflective Spatial Heterodyne Spectrometer written by Seyedeh Sona Hosseini and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this dissertation is to discuss the need for new technology in broadband high-resolution spectroscopy based on the emerging technique of Spatial Heterodyne Spectroscopy (SHS) and to propose new solutions that should enhance and generalize this technology to other fields. Spectroscopy is a proven tool for determining compositional and other properties of remote objects. Narrow band imaging and low resolving spectroscopic measurements provide information about composition, photochemical evolution, energy distribution and density. The extension to high resolving power provides further access to temperature, velocity, isotopic ratios, separation of blended sources, and opacity effects. In current high resolving power devices, the drawback of high-resolution spectroscopy is bound to the instrumental limitations of lower throughput, the necessity of small entrance apertures, sensitivity, field of view, and large physical instrumental size. These limitations quickly become handicapping for observation of faint and/or extended targets and for spacecraft encounters. A technique with promise for the study of faint and extended sources at high resolving power is the reflective format of the Spatial Heterodyne Spectrometer (SHS). SHS instruments are compact and naturally tailored for both high étendue (defined in section 2.2.5) and high resolving power. In contrast, to achieve similar spectral grasp, grating spectrometers require large telescopes. For reference, SHS is a cyclical interferometer that produces Fizeau fringe pattern for all other wavelengths except the tuned wavelength. The large étendue obtainedby SHS instruments makes them ideal for observations of extended, low surface brightness, isolated emission line sources, while their intrinsically high spectral resolution enables one to study the dynamical and physical properties described above. This document contains four chapters. Chapter 1, introduces a class of scientific targets that formerly have not been extensively observed due to absence of technical capabilities in current apparatus. We will introduce the concept of Special Heterodyne Spectrometers and address how it can fill the gap. Chapter 2 reports on the development of a new mathematical frame work for the Reflective SHS. Chapter 3 provides the details of the design and construction of a Tunable Reflective SHS at both UC Davis laboratory and Mt. Hamilton, Lick Observatory, CA. And chapter 4 contains an overview of the prospects of SHS instruments in future.

Download or read book Tunable All Reflective Spatial Heterodyne Spectroscopy a Technique for High Resolving Power Observation Ol Defused Emission Line Sources written by Seyedeh Sona Hosseini and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The solar system presents a challenge to spectroscopic observers, because it is an astrophysically low energy environment populated with often angularly extended targets (e.g, interplanetary medium, comets, planetary upper atmospheres, and planet and satellite near space environments). Spectroscopy is a proven tool for determining compositional and other properties of remote objects. Narrow band imaging and low resolving spectroscopic measurements provide information about composition, photochemical evolution, energy distribution and density. The extension to high resolving power provides further access to temperature, velocity, isotopic ratios, separation of blended sources, and opacity effects. The drawback of high-resolution spectroscopy comes from the instrumental limitations of lower throughput, the necessity of small entrance apertures, sensitivity, field of view, and large physical instrumental size. These limitations quickly become definitive for faint and/or extended targets and for spacecraft encounters.An emerging technique with promise for the study of faint, extended sources at high resolving power is the all-reflective form of the Spatial Heterodyne Spectrometer (SHS). SHS instruments are compact and naturally possess both high étendue and high resolving power. To achieve similar spectral grasp, grating spectrometers require big telescopes. SHS is a common-path beam Fourier transform interferometer that produces Fizeau fringe pattern for all other wavelengths except the tuned wavelength. Compared to similar Fourier transform Spectrometers (FTS), SHS has considerably relaxed optical tolerances that make it easier to use in the visible and UV spectral ranges. The large étendue of SHS instruments makes them ideal for observations of extended, low surface brightness, isolated emission line sources, while their intrinsically high spectral resolution enables the study of the dynamical and spectral characteristics described above. SHS also combines very high (R >105) spectral resolution and large étendue in a small package that is compatible with space mission requirements that have not been met with any other SHS technologies to date.One limitation of current SHS designs is the lack of a broadband capability. To address this gap we are developing a form of the reflective SHS that is tunable over a wide range of wavelength (TSHS). In this work, we describe the primary TSHS concept in a mathematical approach, describe the variations under development, and discuss their scientific potential for the exploration of faint extended targets. An in-development laboratory prototype of a second generation TSHS in which we address several technical limitations noted in earlier studies is shown.This document contains three chapters. Chapter 1, is an overview of the scientific need for a new instrument that we are introducing here and it is an summery of previous papers. Chapter 2 contains new work developing the mathematical frame work for the all reflective SHS. The results presented in this chapter have not been reported in any related literature before and will be presented in an upcoming conference paper. Chapter 3 contains a laboratory report for construction of a tunable all reflective SHS.

Download or read book The Development of the Spatial Heterodyne Spectrometer for Observations of C IV Emissions Near 1550 from the Cygnus Loop and the Diffuse Hot Interstellar Medium written by Steven R. Watchhorn and published by . This book was released on 2001 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spatial Heterodyne Spectroscopy for Long Wave Infrared First Measurements of Broadband Spectra written by and published by . This book was released on 2009 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe the design and implementation of a long-wave infrared (LWIR) spectrometer based on the spatial heterodyne spectroscopy (SHS) technique, and present the first measurements of broadband LWIR spectra taken with an SHS instrument. This work represents the first successful application of SHS to the field of LWIR spectroscopy, which is currently dominated by Fourier transform spectrometers, grating spectrometers, and Fabry-Perot interferometers. A unique combination of properties makes SHS a valuable addition to the existing types of LWIR spectrometers. Most notable are the interferometric throughput (no slit), lack of moving parts, and that the measured spectra are not contaminated by a changing scene, which makes SHS particularly suitable for applications in rugged environments and on moving platforms. The instrument discussed here is called the Spatial Heterodyne Imager for Chemicals and Atmospheric Detection (SHIMCAD), and is designed to cover the wavelength range between about 8.4 microns (1190 cm( -1)) and 11.2 microns (890 cm( -1)) with a spectral resolution of about 4 cm( -1). First, laboratory SHS transmission spectra of methanol and polyimide (Kapton(Trademark)) are presented. The instrument is built to be mobile, so that ultimately field measurements can be conducted.

Download or read book Field widened Spatial Heterodyne Spectroscopy written by J. Harlander and published by . This book was released on 1994 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spatial Heterodyne Spectroscopy for the Exploration of Diffuse Interstellar Emission Lines at Far Ultraviolet Wavelenghts written by John Harlander and published by . This book was released on 1992 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spatial Heterodyne Spectroscopy for the Exploration of Diffuse Interstellar Emission Lines at Far Ultraviolet Wavelengths written by J. Harlander and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Doppler Asymmetric Spatial Heterodyne Spectroscopy DASH Concept and Experimental Demonstration written by and published by . This book was released on 2007 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe the concept of Doppler asymmetric spatial heterodyne spectroscopy (DASH) and present a laboratory Doppler-shift measurement using an infrared laser line. DASH is a modification of spatial heterodyne spectroscopy optimized for high precision, high accuracy Doppler-shift measurements of atmospheric emission lines either from the ground or a satellite. We discuss DASH design considerations, field widening, thermal stability and tracking, noise propagation, advantages, and trade-offs. DASH interferometers do not require moving optical parts and can be built in rugged, compact packages, making them suitable for space flight and mobile ground instrumentation.

Download or read book Spatial Heterodyne Raman Spectroscopy written by Todd Nathaniel and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of the Spatial Heterodyne Spectrometer for VUV Remote Sensing of the Interstellar Medium written by S. Watchorn and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large field High Resolution Spectroscopy written by Jason B. Corliss and published by . This book was released on 2011 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heterodyne Spectroscopy of the Sun at 12 Micrones Using a Diode Laser as the Local Oscillator written by John Jacob Ottusch and published by . This book was released on 1985 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Instrumentation for Absorption Spectroscopy Measurements in the Ultraviolet written by Renata Bartula and published by . This book was released on 2007 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Payloads for Space Missions written by Shen-En Qian and published by John Wiley & Sons. This book was released on 2016-01-26 with total page 1001 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical Payloads for Space Missions is a comprehensive collection of optical spacecraft payloads with contributions by leading international rocket-scientists and instrument builders. Covers various applications, including earth observation, communications, navigation, weather, and science satellites and deep space exploration Each chapter covers one or more specific optical payload Contains a review chapter which provides readers with an overview on the background, current status, trends, and future prospects of the optical payloads Provides information on the principles of the optical spacecraft payloads, missions’ background, motivation and challenges, as well as the scientific returns, benefits and applications