Download or read book Ammonia Detection in the 1 5 mu m Region with External Cavity Tunable Diode Laser for Trace Gas Monitoring written by Zhengfeng Liu and published by . This book was released on 2003 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process Monitoring and Control Ammonia Measurements in Off gases written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This interim report describes technical progress in the development of a laser-based, real-time optical monitor for ammonia in off-gas streams from defense waste processing applications at the Savannah River Site (SRS). An optimized monitor has been fabricated by Spectrum Diagnostix using a tunable diode laser operating in the 1.55-[mu]m wavelength region. Instrument detection limits of 2-3 ppm for ammonia are demonstrated that are more than adequate for the SRS required sensitivity of 10 ppm. Laboratory research at Sandia revealed a lack of interference at the operating wavelength by other molecular species that might be present in the SRS off-gas stream. Initial tests of the ammonia monitor by Sandia were conducted at SRS using a bench-scale processing system for surrogate defense waste sludges. The results of these experiments confirmed that ammonia concentrations issuing from the ammonia-scrubber section of the bench-scale reactor were below the design limit of 10 ppm. We also found that no other molecular species in the off-gas produced observable false-positive readings from the monitor. 5 refs., 6 figs.
Download or read book Mejoramiento de los sistemas de cr dito agr cola institucional en apoyo de un r pido desarrollo de la agricultura written by Henry W. Fairchild and published by . This book was released on 1970 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trace Gas Monitoring by Open path Tunable Diode Laser Absorption Spectrometer OP TDLAS written by University of Victoria (B.C.). Centre for Earth and Ocean Research and published by . This book was released on 1996* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Instruction Manual for Gunn diode Microwave Cavity Ammonia Monitor written by Lawrence W. Hrubesh and published by . This book was released on 1977 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A System to Measure Micrometeorological Ammonia Fluxes Using Tunable Diode Laser Spectroscopy written by Jason Brodeur and published by . This book was released on 2005 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Optic Based Tunable Diode Laser Gas Detector written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Tunable Diode Spectroscopy for Monitoring Gases in Geothermal Plants written by J. K. Partin and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an investigation directed at the development of instrument-tation for the real-time monitoring of gases, such as hydrogen sulfide (H2S) and chloride (HCl), in geothermal process streams is described. The geothermal power industry has an interest in the development of new low maintenance techniques since improved capabilities could lead to considerable cost savings through the optimization of various gas abatement processes. Tunable diode laser spectroscopy was identified as a candidate tech-nology for this application and a commercial instrument was specified and procured for testing. The measurement principle involved the use of solid state diode lasers and frequency modulation techniques. The gallium arsenide diode lasers employed emit light in the 0.7 to 2.0 micron region of the electromagnetic spectrum. This region contains the overtone and combination absorption bands of a number of species of industrial interest, including H2S and HCl. A particular device can be tuned over a small range to match the absorption line by changing its applied temperature and current. The diode current can also be sinusoidally modulated in frequency as it is tuned across the line. This modulation allows measurements to be conducted at frequencies where the laser intensity noise is minimal; and therefore, very high signal-to-noise measurements are possible. The feasibility of using this technology in various types of geothermal process streams has been explored. The results of laboratory and field studies are presented along with new advances in laser technology that could allow more sensitive and selective measurements to be performed.
Download or read book Development of an Ammonia Measurement and Sampling System Based on Tunable Diode Laser Spectroscopy written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multiple Gas Specie Detection Using a Tunable Diode Laser Sensor for Combustion Process Monitoring written by William Von Drasek and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Real Time In Situ Sensor for Control of Ammonia Slip in SCR Installations written by James Daly and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this program, we proposed to demonstrate a compact, rugged, low-cost ammonia sensor with better than {+-}0.2 ppmv lower detection limit and resolution. Extensive design and trade studies indicated that this measurement could be made by exploiting the infrared absorbance of ammonia at 1527 nm to determine concentration. Key features of the design were (1) a electronically-tunable, wavelength-agile diode laser-pumped fiber laser, (2) a unique, low-cost folded path optical cell, and (3) an InGaAs photodiode (light detector). The sensor would be designed to make in situ measurements of ammonia in flue gas just downstream from the catalyst. The design proved robust and was able to operate at pressures in the range 1-3 atm and temperatures up to 500 C. With extensive signal processing, the sensor was able to make unambiguous ammonia measurements. But the signal processing degraded response time to almost 3 seconds and the measurement ambient conditions limited achievable resolution to about 20 ppmv ammonia. Extensive re-design, including a much longer optical path length and more robust real-time signal processing would be required to make sub-ppm measurements using this approach. During the performance period of this project, conventional in-situ laser based monitors and thick film ceramic ammonia sensors have been introduced and have gained acceptance in real-time feed-forward control for this application.
Download or read book Cavity Enhanced Spectroscopy and Sensing written by Gianluca Gagliardi and published by Springer. This book was released on 2013-10-19 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book reviews the dramatic recent advances in the use of optical resonators for high sensitivity and high resolution molecular spectroscopy as well as for chemical, mechanical and physical sensing. It encompasses a variety of cavities including those made of two or more mirrors, optical fiber loops, fiber gratings and spherical cavities. The book focuses on novel techniques and their applications. Each chapter is written by an expert and/or pioneer in the field. These experts also provide the theoretical background in optics and molecular physics where needed. Examples of recent breakthroughs include the use of frequency combs (Nobel prize 2005) for cavity enhanced sensing and spectroscopy, the use of novel cavity materials and geometries, the development of optical heterodyne detection techniques combined to active frequency-locking schemes. These methods allow the use and interrogation of optical resonators with a variety of coherent light sources for trace gas detection and sensing of strain, temperature and pressure.
Download or read book Tunable Laser Diodes written by Markus-Christian Amann and published by Artech House Optoelectronics L. This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive reference discusses the underlying physics, operational principles, and performance and applications of tunable laser diodes. The book is supplemented with practical examples and helpful notations.
Download or read book Cavity Ring Down Spectroscopy written by Giel Berden and published by John Wiley & Sons. This book was released on 2009-08-11 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavity Ring-Down Spectroscopy: Techniques and Applications provides a practical overview of this valuable analytical tool, explaining the fundamental concepts and experimental methods, and illustrating important applications. Designed as both an introductory text and a reference source, this book is relevant for scientists unfamiliar with CRDS who are interested in using the technique in their research, as well as experienced users.
Download or read book Advances in Spectroscopic Monitoring of the Atmosphere written by Weidong Chen and published by Elsevier. This book was released on 2021-06-09 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Spectroscopic Monitoring of the Atmosphere provides a comprehensive overview of cutting-edge technologies and monitoring applications. Concepts are illustrated by numerous examples with information on spectroscopic techniques and applications widely distributed throughout the text. This information is important for researchers to gain an overview of recent developments in the field and make informed selections among the most suitable techniques. This volume also provides information that will allow researchers to explore implementing and developing new diagnostic tools or new approaches for trace gas and aerosol sensing themselves. Advances in Spectroscopic Monitoring of the Atmosphere covers advanced and newly emerging spectroscopic techniques for optical metrology of gases and particles in the atmosphere. This book will be a valuable reference for atmospheric scientists, including those whose focus is applying the methods to atmospheric studies, and those who develop instrumentation. It will also serve as a useful introduction to researchers entering the field and provide relevant examples to researchers and students developing and applying optical sensors for a variety of other scientific, technical, and industrial uses. - Overview of new applications including remote sensing by UAV, laser heterodyne radiometry, dual comb spectroscopy, and more - Features in-situ observations and measurements for real-world data - Includes content on leading edge optical sensors
Download or read book Photonic Microresonator Research and Applications written by Ioannis Chremmos and published by Springer. This book was released on 2010-06-09 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: The technology surrounding the design and fabrication of optical microresonators has matured to a point where there is a need for commercialization. Consequently, there is a need for device research involving more advanced architectures and more esoteric operating principles. Photonic Microresonator Research and Applications explores advances in the fabrication process that enable nanometer waveguide separations, exceptionally smooth surfaces essential to reach Q factors in the order of 106- 108 and high index contrast materials.
Download or read book Photonic Instrumentation Engineering written by Society of Photo-optical Instrumentation Engineers (United States) and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
