Intensity-ratio and color-ratio thin-filament pyrometry: Uncertainties and accuracy

Ma, Bin; Wang, Guanghua; Magnotti, Gaetano; Long, Marshall B.

doi:10.1016/j.combustflame.2013.10.014

Cited by 47 publications

(17 citation statements)

References 13 publications

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“…The coupled spectral response of the camera and BG-7 filter was measured and is similar to the one reported in Ref. [14], although the SLICE's BG-7 filter has lower red light transmission. Lookup tables correlating temperature and color-ratio were generated by integrating soot spectral emissivity over the camera spectral responses as shown by Eq.…”

Section: Soot Diagnosticsmentioning

confidence: 98%

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An experimental and computational study of soot formation in a coflow jet flame under microgravity and normal gravity

Cao

Giassi

et al. 2015

Proceedings of the Combustion Institute

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Upon the completion of the Structure and Liftoff in Combustion Experiment (SLICE) in March 2012, a comprehensive and unique set of microgravity coflow diffusion flame data was obtained. This data covers a range of conditions from weak flames near extinction to strong, highly sooting flames, and enabled the study of gravitational effects on phenomena such as liftoff, blowout and soot formation. The microgravity experiment was carried out in the Microgravity Science Glovebox (MSG) on board the International Space Station (ISS), while the normal gravity experiment was performed at Yale utilizing a copy of the flight hardware. Computational simulations of microgravity and normal gravity flames were also carried out to facilitate understanding of the experimental observations. This paper focuses on the different sooting behaviors of CH 4 coflow jet flames in microgravity and normal gravity. The unique set of data serves as an excellent test case for developing more accurate computational models. Experimentally, the flame shape and size, lift-off height, and soot temperature were determined from line-of-sight flame emission images taken with a color digital camera. Soot volume fraction was determined by performing an absolute light calibration using the incandescence from a flame-heated thermocouple. Computationally, the MC-Smooth vorticity-velocity formulation was employed to describe the chemically reacting flow, and the soot evolution was modeled by the sectional aerosol equations. The governing equations and boundary conditions were discretized on an axisymmetric computational domain by finite differences, and the resulting system of fully coupled, highly nonlinear equations was solved by a damped, modified Newton's method. The microgravity sooting flames were found to have lower soot temperatures and higher volume fraction than their normal gravity counterparts. The soot distribution tends to shift from the centerline of the flame to the wings from normal gravity to microgravity.

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Section: Soot Diagnosticsmentioning

confidence: 98%

“…[13,14], was used in this study. The DSLR camera was fully characterized and used as a color-ratio pyrometer.…”

Section: Soot Diagnosticsmentioning

confidence: 99%

An experimental and computational study of soot formation in a coflow jet flame under microgravity and normal gravity

Cao

Giassi

et al. 2015

Proceedings of the Combustion Institute

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“…We measured the emission intensities using the fB, fN1filters for H 2 O, and f2 and f4 filters for CO 2 , respectively. Table 2 also shows the temperature T SiC , which was measured by the black body radiation from SiC wire 4) inserted into 15 mm above the porous plate at the center of the burner. We set the T SiC as the reference temperature and compared measured temperature with T SiC .…”

Section: Water-cooled Mckenna Flat Flame Burnermentioning

confidence: 99%

Temperature Measurement by Two-Band Emission Method with CO<sub>2</sub> and H<sub>2</sub>O Molecules

Mori

Shimada

Takahashi

et al. 2016

AEROSPACE TECHNOLOGY JAPAN

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Two-band emission method for measuring temperature distribution using CO 2 or H 2 O as the emission medium was developed. In the calibration test using McKenna hydrogen flat flame burner, the developed method had similar quantitativity compared with the other measurement methods, CARS and SiC radiant method. When we applied the developed two-band emission method to high enthalpy supersonic wind tunnel experiment, we could capture the behavior of shockwaves and expansion fans in the supersonic flow and the reconstructed temperature distribution was reasonably quantitative.

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“…Based on color images captured with color cameras, temperature distributions can be determined according to the radiation intensity captured by the optical channels. For calculation, the two-color method, which eliminates the influence of all other factors except the temperature, is widely used [24][25][26][27]. Huang et al [28] used an RGB pyrometer to measure the surface temperature of a deposit.…”

Section: Introductionmentioning

confidence: 99%

Measuring surface temperatures of different types of fly ash samples using a CCD camera

et al. 2022

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In this work, an optical emission-based two-color method was experimentally investigated for the measurement of surface temperatures of different types of fly ash samples using a CCD camera. A heating system consisting of a Hencken flat-flame burner, a narrow piece of stainless steel wire mesh to separate the flame and the ash samples to be studied, and a thermocouple to record the temperature, was used to heat fly ash samples. A color camera equipped with a tri-band filter was used to capture radiation images. Fly ash samples collected from three kinds of coal-fired boilers were heated and imaged at different temperatures. The chemical compositions, elements, and particle size distributions were analyzed. The emissivity ratios of the wavelengths corresponding to the R and G optical channels and permitted by the tri-band filter were experimentally determined. A two-color method was subsequently used to calculate the average surface temperatures with relative errors within ? 2 % in the experiments, and an uncertainty analysis was conducted. Surface temperature distributions were also calculated and presented. The results demonstrate that the emission-based two-color method can be used to determine reliable average surface temperatures and surface temperature distributions when the radiation emitted from the ash samples is obviously greater than the ambient light. The results also show that the method has a lower limit of temperature measurement, which will lessen with the use of larger apertures and a higher radiation capacity of the ash samples to be studied.

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Intensity-ratio and color-ratio thin-filament pyrometry: Uncertainties and accuracy

Cited by 47 publications

References 13 publications

An experimental and computational study of soot formation in a coflow jet flame under microgravity and normal gravity

An experimental and computational study of soot formation in a coflow jet flame under microgravity and normal gravity

Temperature Measurement by Two-Band Emission Method with CO<sub>2</sub> and H<sub>2</sub>O Molecules

Measuring surface temperatures of different types of fly ash samples using a CCD camera

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