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 Application of the Self Calibrating Emissivity And or Transmissivity Independent Multiwavelength Pyrometer in an Intense Ambient Radiation Environment written by and published by . This book was released on 1996 with total page 16 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 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 Remote Heat Flux Measurement Using a Self Calibration Multiwavelength Pyrometer and a Transparent Material written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-29 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A self calibrating multiwavelength pyrometer was used to conduct remote heat flux measurements using a transparent sapphire disk by determining the sapphire disk's front and back surface temperatures. Front surface temperature (Tfs) was obtained from detection of surface emitted radiation at long wavelengths (lambda > 6 micrometers). Back surface temperature (Tbs) was obtained from short wavelength (1 to 5 micrometers) radiation transmitted through the sapphire disk. The thermal conductivity k of the sapphire disk and the heat transfer coefficients h(sub 1) and h(sub 2) of its surfaces are determined experimentally. An analysis of the heat flux measurement is presented. Ng, Daniel Glenn Research Center NASA/TM-1998-208809, NAS 1.15:208809, E-11399 RTOP 523-21-13...
Download or read book Practical Pyrometry written by Ervin Sidney Ferry and published by . This book was released on 1917 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Self Calibration of a 2 Wavelength Pyrometer written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-28 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pyrometers require calibrations to determine their instrument constants before they can be used in remote temperature measurements. These constants reflect the combined effects of detector response, the transmissivities of intervening optical media (windows and gases) and the emissivity of the measured surface. We describe here the principal and the demonstration of self calibrating 2-wavelength pyrometer. Ng, Daniel Glenn Research Center NASA/TM-1998-208808, E-11398, NAS 1.15:208808 RTOP 523-21-13...
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 Pyrometry written by Charles Robert Darling and published by . This book was released on 1911 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Practical Pyrometry The Theory Calibration and Use of Instruments for the Measurement of High Temperatures written by Jacob R. Collins and published by READ BOOKS. This book was released on 2008-10 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: PREFACE. THE Author of this very practical treatise on Scotch Loch - Fishing desires clearly that it may be of use to all who had it. He does not pretend to have written anything new, but to have attempted to put what he has to say in as readable a form as possible. Everything in the way of the history and habits of fish has been studiously avoided, and technicalities have been used as sparingly as possible. The writing of this book has afforded him pleasure in his leisure moments, and that pleasure would be much increased if he knew that the perusal of it would create any bond of sympathy between himself and the angling community in general. This section is interleaved with blank shects for the readers notes. The Author need hardly say that any suggestions addressed to the case of the publishers, will meet with consideration in a future edition. We do not pretend to write or enlarge upon a new subject. Much has been said and written-and well said and written too on the art of fishing but loch-fishing has been rather looked upon as a second-rate performance, and to dispel this idea is one of the objects for which this present treatise has been written. Far be it from us to say anything against fishing, lawfully practised in any form but many pent up in our large towns will bear us out when me say that, on the whole, a days loch-fishing is the most convenient. One great matter is, that the loch-fisher is depend- ent on nothing but enough wind to curl the water, -and on a large loch it is very seldom that a dead calm prevails all day, -and can make his arrangements for a day, weeks beforehand whereas the stream- fisher is dependent for a good take on the state of the water and however pleasant and easy it may be for one living near the banks of a good trout stream or river, it is quite another matter to arrange for a days river-fishing, if one is looking forward to a holiday at a date some weeks ahead. Providence may favour the expectant angler with a good day, and the water in order but experience has taught most of us that the good days are in the minority, and that, as is the case with our rapid running streams, -such as many of our northern streams are, -the water is either too large or too small, unless, as previously remarked, you live near at hand, and can catch it at its best. A common belief in regard to loch-fishing is, that the tyro and the experienced angler have nearly the same chance in fishing, -the one from the stern and the other from the bow of the same boat. Of all the absurd beliefs as to loch-fishing, this is one of the most absurd. Try it. Give the tyro either end of the boat he likes give him a cast of ally flies he may fancy, or even a cast similar to those which a crack may be using and if he catches one for every three the other has, he may consider himself very lucky. Of course there are lochs where the fish are not abundant, and a beginner may come across as many as an older fisher but we speak of lochs where there are fish to be caught, and where each has a fair chance. Again, it is said that the boatman has as much to do with catching trout in a loch as the angler. Well, we dont deny that. In an untried loch it is necessary to have the guidance of a good boatman but the same argument holds good as to stream-fishing...
Download or read book Practical Pyrometry written by Ervin Ferry and published by CreateSpace. This book was released on 2015-07-17 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book was written for three classes of readers-"college students, technically trained men who deal with processes requiring high temperature measurements, and less trained observers who may make the measurements." The book is practically a synopsis of "Measurement of high temperatures" by Burgess and Le Chatelier, Wiley, 1912, but is presented in different form especially suitable for the class room, as minor details are omitted, and in several places the text is illustrated by practical problems. Also at the end of each chapter are several experiments, fourteen in all, which are prepared in sufficient detail for the ordinary student, and which cover the field of pyrometry very satisfactorily. The chapters are headed as follows: (1) Standard Temperature Scales; (2) Resistance Pyrometry; (3) Thermoelectric Pyrometry; (4) Radiation Pyrometry; (5) Optical Pyrometry. The text is well illustrated and several new American instruments are shown. A few comments may be made on points of minor detail. In the preface it is stated that "the day is already past when foundrymen and steel workers depend upon the eye to judge the temperatures of their product in the various stages of its heat treatment, when makers of ceramic products depend upon the indication of fusible cones," etc. One needs but visit industrial plants to realize this Utopian condition is far from being fulfilled. Probably nine out of ten ceramic industries employ fusible cones or similar means of temperature measurement, and many of the leading ceramic engineers of this country advocate their use in preference to more scientific instruments. A point in history is brought out on page 3. Bolton ("Evolution of the thermometer") states that Celsius assigned the number 100 to the temperature of melting ice and o to the temperature of steam. The present assignment of numerals was made by Christ in 1743. Also, according to Bolton, Fahrenheit did not assign the number 212 to the boiling point of water as here stated. The method of correcting for lead resistance of the resistance thermometer, page 21, is crude. Even for the most elementary students, the bridge should be arranged as in Fig. 7. A student will be interested in solving the mathematics of the Wheatstone bridge in order to see why the arrangement in Fig. 7 compensates properly. Sulphur should not be boiled in an aluminum tube as illustrated in Fig. 15. With such a tube electrically heated to the top as shown in the figure, the vapor can be superheated to almost any value. The heating coil should be much shorter, and for accurate work glass tubes are to be preferred. The geometrical optics of Fig. 44 is incorrect. Prism M, Fig. 62, should be turned through 1800. Recent work indicates that C2 is more nearly equal to 14,350 than 14,500 as given on page 91. On page 140 it is stated that "a person of no training can get better results with a radiation pyrometer than with an optical pyrometer." This is contrary to experience. Published investigation has shown that persons who are totally unfamiliar with the optical pyrometer can set to within 50 or 10° C. To obtain such accuracy with a radiation pyrometer requires a great amount of experience and a consideration of many factors which are not mentioned in any text-book.... The demand for engineers having some knowledge of practical pyrometry is becoming greater every year. Many schools are offering courses in this subject and the day is near when pyrometry will be a required course for engineers and chemists. The present book should serve as a suitable text for a junior or senior course covering one semester. -Physical Review [1918]
Download or read book Self calibrated Active Pyrometer for Furnace Temperature Measurements written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pyrometer with a probe beam superimposed on its field-of-view for furnace temperature measurements. The pyrometer includes a heterodyne millimeter/sub-millimeter-wave or microwave receiver including a millimeter/sub-millimeter-wave or microwave source for probing. The receiver is adapted to receive radiation from a surface whose temperature is to be measured. The radiation includes a surface emission portion and a surface reflection portion which includes the probe beam energy reflected from the surface. The surface emission portion is related to the surface temperature and the surface reflection portion is related to the emissivity of the surface. The simultaneous measurement of surface emissivity serves as a real time calibration of the temperature measurement. In an alternative embodiment, a translatable base plate and a visible laser beam allow slow mapping out of interference patterns and obtaining peak values therefor. The invention also includes a waveguide having a replaceable end portion, an insulating refractory sleeve and/or a source of inert gas flow. The pyrometer may be used in conjunction with a waveguide to form a system for temperature measurements in a furnace. The system may employ a chopper or alternatively, be constructed without a chopper. The system may also include an auxiliary reflector for surface emissivity measurements.
Download or read book REMOTE HEAT FLUX MEASUREMENT USING A SELF CALIBRATION MULTIWAVELENGTH PYROMETER AND A TRANSPARENT MATERIAL NASA TM 1998 208809 MAR 1 1999 written by United States. National Aeronautics and Space Administration 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 Practical Pyrometry written by Ervin Sidney Ferry and published by Forgotten Books. This book was released on 2017-10-12 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Practical Pyrometry: The Theory, Calibration, and Use of Instruments for the Measurement of High Temperatures The day is already past when foundrymen and steel workers de pend upon the eye to judge the temperatures of their product in the various stages of its heat treatment, when makers of ceramic products depend upon the indication of fusible cones, and when operators of cold storage plants are content to observe numerous thermometers scattered throughout their establishments. The requirements of modern industrial processes and the severe com petition of commercial enterprises now require not only more precise knowledge of temperatures, but in many cases also re quire a continuous automatic record of the temperature state extending over an interval of time. Several years ago, anticipating the need by technical students of a Course in High Temperature Measurements, the work of testing the various methods and apparatus was begun. After three years devoted to this survey, a course was organized and offered. It was received with such favor that it was made a required subject in the plan of study for students of chemical engineering at Purdue University. Each year since then, a new edition of Notes, in mimeographed form, has been put into the hands of the students. It has now been thought proper to put into more readable and permanent form the results of this experience. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Use of a Variable Exposure Photographic Pyrometer to Measure Surface Temperatures on a Hemispherical face Model written by and published by . This book was released on 1982 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
