This paper documents the application of high speed phosphor thermometry to measure cylinder head temperatures under fired engine conditions. The history of phosphor thermometry in the authors opin ion falls into three. By utilizing highspeed piv measurements, the objective of this study is to examine the performance of an algebraic equilibrium wallfunction model that has been widely employed in rans and les icengine simulations 14. For thermometry, the phosphor particles were excited using the third harmonic of a diode pumped nd. Highspeed planar thermometry and velocimetry using thermographic phosphor particles article pdf available in applied physics b 1112 may 20 with 5 reads how we measure reads. If hightimeresolution temperature measurements can be performed using a phosphor and a highspeed camera, it will be straightforward to combine phosphor thermometry with the abovementioned temperature and velocity measurement system by using phosphor particles as. Pdf phosphor thermometry techniques for the realization of. Phosphor thermometry is a semiinvasive surface temperature measurement technique utilizing the luminescence properties of thermographic phosphors. Phosphorescent materials are known for their use in radar screens and glowinthedark toys, whereas.
The effects of codoping on the temperaturedependent luminescence of yag. Unknown parameter deadurl ignored seeing phosphor bands on u. The use of highspeed cameras for quantitative measurements has previously been investigated using a similar camera of an earlier generation photron sa1. Mar 29, 20 accuracy and precision of high speed phosphor thermometry. Thermographic laser doppler velocimetry using the phase. Next, it outlines the several advantages of fluorescence thermometry.
Review on an advanced hightemperature measurement technology. Simultaneous measurements of phosphor thermometry and piv for. Phosphor physics thermographic phosphors for high temperature applications consist of a ceramic host material doped with rareearth ions lanthanides at concentrations typically between 1% and 10%. By the pixelwise evaluation of the luminescence lifetimes, a temperature map of a phosphor layer can be obtained. Typically these ceramic materials are coated onto the object of interest and are excited by a short uv laser pulse.
A suitable material was characterised regarding its temperature lifetime characteristic and its measurement precision. Laserinduced phosphor thermometry semantic scholar. Based on the work of heyes, who developed a method to design phosphors for high temperature, at the moment yag. Thermographic laser doppler velocimetry using the phaseshifted luminescence of bam. Hightemperature phosphor thermometry of rotating turbine. The phosphor thermometry was applied to measure the temperature. In this work, the phosphors osram phosphor sv 067 n magnesium. The fast, efficient tracer permits precise temperature measurements at khz rates, despite the low pulse energy of highspeed 355 nm lasers. Nonlinearity was found to increase with increasing signal and to be phosphor thermometry is an optical method for surface temperature measurement.
A generic phosphor thermometry system comprises of components illustrated in figure 5. Phosphor thermometry techniques for the realization of. After excitation through a short uv laser pulse, a luminescence fig 2. Development of the phosphor thermometry technique for. Many blackbody, infrared, and fluorescence optical thermometers are developed for practical applications. Phosphor thermometry techniques for the realization of thermal standards. High speed imaging resolves luminescent decay with a fast frame rate, and has become a popular method for phosphor thermometry in recent years. With increasing temperature, the wide emission band exhibits a pronounced blue shift, which can be exploited for temperature imaging using a twocolour. Nonlinearity was found to increase with increasing signal and to be 1 ms, and fluorescent materials, where the emission decay takes place over tens of nanoseconds. Phosphor thermometry is a temperature measurement approach that uses the temperature dependence of certain phosphors for this purpose. High precision phosphor temperature sensors are disclosed.
The phosphor particles used in thermometry are usually inorganic materials having the form of a whitebrown powder some 1 10 m in diameter. A large number of different phosphors are produced today. Heyes,4 and frank beyrau 2 1department of mechanical engineering, imperial college london, london sw7 2az, uk. Phosphorescent materials are known for their use in radar screens and glowinthedark materials, whereas fluorescent. Imaging phosphor thermometry from t 20 c to 450 c using. Phosphor thermometry is a semiinvasive surface temperature measurement technique utilising the luminescence properties of doped ceramic materials. Jun 27, 2009 in the present study, a cmos high speed camera system was employed for twodimensional thermographic phosphor thermometry. High speed thermographic particle image velocimetry.
Implementation of an ultrabright thermographic phosphor. Thermometry thermometry is the science and practice of temperature measurement. Influence of codoping on the luminescence properties of. Application of phosphor thermometry to a galvanneal temperature measurement system david l. Tpt thermographic phosphor thermometry v velocity vector df d doppler shift of light l wavelength of light 1 introduction the ultimate goal of the aerodynamicist is to solve the navierstokes equations for turbulent. Photomultipliers and high speed camera systems are used to transiently detect the subsequently emitted luminescence decay point wise.
Up to now, primarily qswitched laser systems with repetition rates of 10 hz were employed for excitation. Using spatially and temporally isothermal conditions in a tube furnace, a temperature lifetime characteristic was determined for the phosphor mg4fgeo6. Osa investigation of the tindoped phosphor sr,mg3po4. Many phosphors tend to lose efficiency gradually by several mechanisms. However, its decay time is too long for studying temperatures in fast transient technical processes. Jan 10, 2018 noncontact and instant detection of phosphor temperature in phosphorconverted white leds. Archived from the original pdf on 20 september 2016. An excitation source is used to excite the phosphor that is bonded onto the surface of interest. Figure 1 shows the experimental setup for highspeed thermographic piv.
Intensities can be followed continuously and ratioed to give time dependent temperatures. Phosphor physics thermographic phosphors for high temperature applications consist of a ceramic host material doped with rareearth ions lanthanides at concentrations typically between 1%. Phosphor thermometry is another noncontact technique that uses optical signals to measure temperature remotely. Such a phosphor consists of a host material and a doping agent from which the light is emitted. Typically, these phosphor materials are coated onto the object of interest and are excited by a short uv laser pulse. Generic phosphor thermometry system and comparison with other techniques.
Dy is a wellknown thermographic phosphor suitable for high temperature measurements. Mar 29, 20 high speed planar thermometry and velocimetry using thermographic phosphor particles high speed planar thermometry and velocimetry using thermographic phosphor particles abram, christopher. Development of phosphor thermometry systems for use in. Osa highprecision flow temperature imaging using zno. In the present study, a cmos high speed camera system was employed for twodimensional thermographic phosphor thermometry. The photoluminescence properties of the phosphor sr,mg3po42.
Typical examples include centrifuges, turbine engine components, high speed motors, radioactive or very high temperature environments, or vibrating or moving production machinery. Review article remote thermometry with thermographic. Somewhat confusingly, this includes both phosphorescent materials, which show a slow decay in brightness 1ms, and fluorescent materials, where the emission decay takes place over tens of nanoseconds. Development of new phosphors for high temperature thermometry. Cr,ce was synthesized with a special composition to meet the requirements of the measurement technique and the device under test. For this, a phosphor coating is applied to a surface of interest and, usually, the decay time is the emission parameter that indicates temperature. Phosphors are fine white or pastelcolored inorganic powders which may be stimulated by any of a variety of means to luminesce, i. Noncontact and instant detection of phosphor temperature. Accuracy and precision of highspeed phosphor thermometry.
Thermographic phosphors for high temperature measurements. The principles, characteristics, recent progresses and advantages of the technology are described. A thermometer is a device that measures temperature or a temperature gradient. Photomultipliers and highspeed camera systems are used to transiently detect the subsequently emitted luminescence decay. Yi et al 6, 7 utilise a highspeed camera 4000 fps, mg 4fgeo 6. Consideration factors 1 july 2010 proceedings of the institution of mechanical engineers, part g. The sensors include a light source that emits an excitation light through one or more optical fibers to one or more phosphors that produce fluorescent emissions when engaged by the excitation light. Noncontact and instant detection of phosphor temperature in. Using spatially and temporally isothermal conditions in a tube furnace, a temperature lifetime characteristic was determined for the. A phosphor, most generally, is a substance that exhibits the phenomenon of luminescence. May 17, 2012 twodimensional thermographic phosphor thermometry using a cmos high speed camera system 27 june 2009 applied physics b, vol. The beam was expanded using a galilean telescope and then formed into a 600. Highspeed planar thermometry and velocimetry using. Phosphors are composed of a ceramic lattice doped with a small amount of luminescent ions and will.
Mn phosphor and an led excitation source to measure the temperature distribution on a. However, this technique is not vulnerable to the issues of pyrometers, thermocouples, thermal paints, and many other thermal sensors. Highspeed planar thermometry and velocimetry using thermographic phosphor particles christopher abram benoit fond andrew l. Mn phosphor and an led excitation source to measure the temperature distribution on a heated aluminium. Oct 30, 20 this paper documents the application of high speed phosphor thermometry to measure cylinder head temperatures under fired engine conditions. Childs oak ridge national laboratory oak ridge, tennessee 378318058 joe vehec advanced. Zinc oxide zno particles are characterised as a tracer for temperature measurements in turbulent flows, in the context of the thermographic particle image velocimetry technique. Sep 10, 20 phosphor thermometry is a semiinvasive surface temperature measurement technique utilizing the luminescence properties of thermographic phosphors. Highspeed planar thermometry and velocimetry using thermographic phosphor particles highspeed planar thermometry and velocimetry using thermographic phosphor particles abram, christopher. Cylinder head temperature determination using highspeed. Development staff members research professor oak ridge national laboratory university of virginia oak ridge, tn 378318058 charlottesville, va. Flow measurements are used to compare the temperature precision of zno to that obtained using a wellcharacterised thermographic phosphor, bam. The use of high speed cameras for quantitative measurements has previously been investigated using a similar camera of an earlier generation photron sa1.
Oct 27, 2011 this contribution reports on the first realisation of a high speed phosphor thermometry system employing a highly repetitive laser in the khz regime and a fast decaying phosphor. These advantages include a measurement of temperature by transfer to measurement standards for time, b remote sensing for surface thermometry, c high speed of measurement relative to many physical and mechanical phenomena, d narrowspectrum optical sensing suitable. Eu phosphors for white leds prepared by the gasreductionnitridation method free pdf. Application of phosphor thermometry to a galvanneal. Dy were investigated for application in high temperature thermometry. Jun 11, 2019 in this work, the phosphors osram phosphor sv 067 n magnesium. If high timeresolution temperature measurements can be performed using a phosphor and a high speed camera, it will be straightforward to combine phosphor thermometry with the abovementioned temperature and velocity measurement system by using phosphor particles as temperaturesensitive tracer particles. Laserinduced phosphorescence for surface thermometry in.
Comparison of lifetimebased methods for 2d phosphor. Simultaneous measurements of phosphor thermometry and piv for hightemperature gas flows 2015012002 this study reports a novel alternative technique that can achieve simultaneous twodimensional temperature and velocity measurements in gas flow. Simultaneous measurements of phosphor thermometry and piv. Development and analysis of wall models for internal. Phosphor thermometry is a term describing an optical measurement technique for. The method exploits luminescence emitted by phosphor material. In situ contactless thermal characterisation and imaging. The application of laser measurement techniques to. Gap phosphor that makes these measurements possible at turbine engine temperatures is the exceptionally high strength. Dy is the phosphor with the highest capability for thermometry at high temperatures. Also, phosphor may be applied to the end of an optical fiber as an optical analog of a thermocouple. The fluorescent emissions is transmitted optically from the phosphors directly to a detector or an optical diffraction grating. Led was 10 hz, and the frame rate of the high speed camera was 8000 fps. Noncontact and instant detection of phosphor temperature in phosphorconverted white leds.
Calibration measurements are given in the first section, providing the temperature. Twodimensional thermographic phosphor thermometry using a. Phosphor thermometry is a semiinvasive surface temperature measurement technique utilising the luminescence properties of doped ceramic. The activators can undergo change of valence usually oxidation, the crystal lattice degrades, atoms often the activators diffuse through the material, the surface undergoes chemical reactions with the environment with consequent loss of efficiency or buildup of a layer absorbing either the. Transient thermometry intensity ratios are attractive for measurement of systems where surface temperature is changing rapidly. Furthermore, thermographic phosphors have a high melting point, are chemically inert, and insensitive to pressure and oxygen quenching, broadening the range of potential applications. The phosphor thermometry utilizes temperaturedependent luminescence. To achieve this aim the numerical model must contain all the resolvable scalesin the. Sec tion vii compares the performance of phosphor thermometry with that of. The fundamental principles and theory are presented, and the various spectral and temporal modes, including the lifetime decay, rise time and intensity ratio, are discussed. Vacuum light sources high speed stroboscopic light sources data sheet pdf.
The application of laser measurement techniques to aerospace. This paper discusses the currently available techniques for 2d phosphor thermometry, and compares the performance of two lifetimebased methods. Yag laser with a pulse duration of 25 ns and a pulse energy of 1. Fluorogermanate, manganaktiviert, lot 48 were mixed with a high. The luminescence emission intensity at 300 k is on the order of 106 photons per particle and the lifetime is 26.