Download or read book Multi wavelength Pyrometric Systems for Emissivity independent Non contact Temperature Sensing written by Michael B. Kaplinsky and published by . This book was released on 1997 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Multi-Wavelength Imaging Pyrometer (M-WIP) for real-time remote sensing of temperature profiles of targets with unknown emissivity was developed and demonstrated. To measure the spectral radiance of a target at several distinct wavelengths an M-WIP system was implemented based on an 320x122-element PtSi IR-CCD imager with an assembly of 7 narrow-band 1k filters in the range from 1790nm to 4536nm. A real-time algorithm for simultaneous estimation of the temperature and model parameters of the target emissivity from the least-squares fit of the theoretical model of 1k camera output signal to the experimental spectral measurements was developed and implemented. This rea1-time least-squares minimization was accomplished by combination of Levenberg-Marquardt and simulated annealing algorithms. The least-squares-based calibration algorithm was developed for evaluation of effective values of peak transmissions and center wavelengths of M-WIP channels based on the detection of radiation from pre-calibrated blackbody source. To achieve high radiometric accuracy, compensation for the dark current charge as function of the detected signal level was implemented. The effect of the response non-linearity of IR imager was minimized by developing an algorithm for imager operation at fixed pre-selected signal level for each M-WIP spectral channel based on adaptive control of the duration of the optical integration time of the imager. Initial testing demonstrated an accuracy of ±l.0°C for real-time temperature measurements of the center of the blackbody aperture in the range from 500°C to 1000°C. Temperature resolution of ±3°C was demonstrated for the blackbody source viewed through a double side polished silicon wafer with unknown spectral transmissivity in the temperature range from 500°C to 900°C.
Download or read book Non contact Heat Flux Measurement Using a Transparent Sensor written by Daniel Ng and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Self Calibrating Emissivity And or Transmissivity Independent Multiwavelength Pyrometer written by and published by . This book was released on 1996 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Non Contact Thermal Barrier Coating TBC Heat Flux Sensor Using a Self Calibrating Multiwavelength Pyrometer written by and published by . This book was released on 1996 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of the Self Calibrating Emissivity And Or Transmissivity Independent Multiwavelength Pyrometer in an Intense Ambient Radiation Environment written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-17 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA self calibrating multiwavelength pyrometer is a recent addition to the list of pyrometers used in remote temperature measurement in research and development. The older one-color, two-color, and the disappearing filament pyrometers, as well as the multicolor and early multiwavelength pyrometers, all do not operate successfully in situations in which strong ambient radiation coexists with radiation originating from the measured surface. In such situations radiation departing from the target surface arrives at the pyrometer together with radiation coming from another source either directly or through reflection. Unlike the other pyrometers, the self calibrating multiwavelength pyrometer can still calibrate itself and measure the temperatures in this adverse environment. Ng, Daniel Glenn Research Center NASA-TM-107151, E-10089, NAS 1.15:107151 RTOP 505-62-50...
Download or read book Multiwavelength Pyrometry to Correct for Reflected Radiation written by and published by . This book was released on 1990 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Single fiber Multi color Pyrometry written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This invention is a fiber-based multi-color pyrometry set-up for real-time non-contact temperature and emissivity measurement. The system includes a single optical fiber to collect radiation emitted by a target, a reflective rotating chopper to split the collected radiation into two or more paths while modulating the radiation for lock-in amplification (i.e., phase-sensitive detection), at least two detectors possibly of different spectral bandwidths with or without filters to limit the wavelength regions detected and optics to direct and focus the radiation onto the sensitive areas of the detectors. A computer algorithm is used to calculate the true temperature and emissivity of a target based on blackbody calibrations. The system components are enclosed in a light-tight housing, with provision for the fiber to extend outside to collect the radiation. Radiation emitted by the target is transmitted through the fiber to the reflective chopper, which either allows the radiation to pass straight through or reflects the radiation into one or more separate paths. Each path includes a detector with or without filters and corresponding optics to direct and focus the radiation onto the active area of the detector. The signals are recovered using lock-in amplification. Calibration formulas for the signals obtained using a blackbody of known temperature are used to compute the true temperature and emissivity of the target. The temperature range of the pyrometer system is determined by the spectral characteristics of the optical components.
Download or read book Application of the Self Calibrating Emissivity And or Transmissivity Independent Multiwavelength Pyrometer to Measure the Temperatures of Tungsten and Refractory Material Surfaces written by and published by . This book was released on 1996 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Multicolor Pyrometer written by B. B. Brenden and published by . This book was released on 1958 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radiometric Temperature Measurements written by and published by Academic Press. This book was released on 2009-10-01 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the theory of radiation thermometry, both at a primary level and for a variety of applications, such as in the materials processing industries and remote sensing. This book is written for those who will apply radiation thermometry in industrial practice; use radiation thermometers for scientific research; the radiation thermometry specialist in a national measurement institute; developers of radiation thermometers who are working to innovate products for instrument manufacturers, and developers of non-contact thermometry methods to address challenging thermometry problems. The authors of each chapter were chosen from a group of international scientists who are experts in the field and specialists on the subject matter covered in the chapter. A large number of references are included at the end of each chapter as a resource for those seeking a deeper or more detailed understanding. This book is more than a practice guide, readers will gain in-depth knowledge in: (1) the proper selection of the type of thermometer; (2) the best practice in using the radiation thermometers; (3) awareness of the error sources and subsequent appropriate procedure to reduce the overall uncertainty; and (4) understanding of the calibration chain and its current limitations. Covers all fundamental aspects of the radiometric measurements Discusses practical applications with details on the instrumentation, calibration, and error sources Authors are from leading national labs working in R&D of temperature measurements
Download or read book Advances in Rapid Thermal Processing written by Fred Roozeboom and published by The Electrochemical Society. This book was released on 1999 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transient Thermal Processing Techniques in Electronic Materials written by Nuggehalli M. Ravindra and published by Minerals, Metals, & Materials Society. This book was released on 1996 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a research update of silicon and non-silicon transient processing techniques such as rapid thermal processing, pulsed laser processes, flash evaporation, jet processes, and more. Also covered are process sensors, equipment issues, and the manufacturing perspective.
Download or read book Sensors Thermal Sensors written by Wolfgang Göpel and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'Sensors' is the first self-contained series to deal with the wholearea of sensors. It describes general aspects, technical andphysical fundamentals, construction, function, applications anddevelopments of the various types of sensors. This volume describes the construction and applicational aspects ofthermal sensors while presenting a rigorous treatment of theunderlying physical principles. It provides a unique overview ofthe various categories of sensors as well as of specific groups,e.g. temperature sensors (resistance thermometers, thermocouples,and radiation thermometers), noise and acoustic thermometers,heat-flow and mass-flow sensors. Specific facettes of applicationsare presented by specialists from different fields includingprocess control, automotive technology and cryogenics. This volumeis an indispensable reference work and text book for bothspecialists and newcomers, researchers and developers.
Download or read book Official Gazette of the United States Patent and Trademark Office written by and published by . This book was released on 1992 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared Detectors and Focal Plane Arrays written by and published by . This book was released on 1996 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two Step Calibration of a Multiwavelength Pyrometer for High Temperature Measurement Using a Quartz Lamp written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is no theoretical upper temperature limit for pyrometer application in temperature measurements. NASA Glenn's multiwavelength pyrometer can make measurements over wide temperature ranges. However, the radiation spectral response of the pyrometer's detector must be calibrated before any temperature measurement is attempted, and it is recommended that calibration be done at temperatures close to those for which measurements will be made. Calibration is a determination of the constants of proportionality at all wavelengths between the detector's output (voltage) and its input signals (usually from a blackbody radiation source) in order to convert detector output into radiation intensity. To measure high temperatures, the detectors are chosen to be sensitive in the spectral range from 0.4 to 2.5 micrometers. A blackbody furnace equilibrated at around 1000 C is often used for this calibration. Though the detector may respond sensitively to short wavelengths radiation, a blackbody furnace at 1000 C emits only feebly at very short wavelengths. As a consequence, the calibration constants that result may not be the most accurate. For pyrometry calibration, a radiation source emitting strongly at the short wavelengths is preferred. We have chosen a quartz halogen lamp for this purpose. Ng, Daniel Glenn Research Center NASA/TM-2001-211124, E-12973, NAS 1.15:211124
Download or read book Thermal Sensors written by Gerard C. M. Meijer and published by CRC Press. This book was released on 1994-10-27 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal Sensors is intended as a comprehensive and accessible reference for designers and users of thermal sensors. Many different physical quantities can be converted easily and accurately into temperature differences using thermal techniques. These temperature differences can be detected with temperature and temperature-difference sensors. In a thermal sensor the thermal converter and the temperature sensor are combined in a single accurate device. This book gives an overview and deals with the design aspects of thermal and temperature sensors, with an emphasis on sensors based on silicon technology. The temperature sensors described are based on the use of various types of sensitive elements, such as platinum resistors, thermistors and special integrated circuits. The thermal sensors described include flow, conductivity, infrared, vacuum, humidity and calorimetric sensors, and ac-dc converters, thus providing a comprehensive overview of all thermal sensors, with practical examples of each type.
