Temperature measurements utilizing two-bandpass fiber optic radiometry

Eyal, Ori; Katzir, Abraham

doi:10.1117/12.188614

Cited by 9 publications

(2 citation statements)

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“…In such a case, if one assumes that the emissivity is constant (as for a gray body), then the emissivity cancels out. Several dual-band systems have also been constructed 4,5,6 . These systems are more complicated than single-band systems.…”

Section: Introductionmentioning

confidence: 98%

Fiber optic infrared multispectral radiometers for emissivity and temperature measurements of gray bodies near room temperatures

et al. 2004

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Two fiberoptic infrared multi-spectral radiometers were constructed for measurements of the temperature and the emissivity of gray bodies whose temperatures were close to room temperature (40-70 o C). In one radiometer, the different spectral regions were obtained by using standard bulk interference filters, and in a second radiometer, the different spectral regions were obtained by using hollow glass waveguides (HGWs) as filters. Using these two radiometers, we carried out temperature and emissivity measurements of three gray bodies which had high emissivity (ε=0.97), medium emissivity (ε=0.71) and low emissivity (ε=0.025). We present the results obtained for these gray bodies and discuss the advantages and disadvantages in using each of the radiometers.

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Section: Introductionmentioning

confidence: 98%

Fiber optic infrared multispectral radiometers for emissivity and temperature measurements of gray bodies near room temperatures

et al. 2004

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“…It has been claimed for some time that one way to circumvent this limitation is to acquire radiometric signals in two separate spectral bands and to calculate the ratio of the two spectral radiances, which turns out to be a unique and monotonic function of temperature regardless of the target's emissivity at least as long as said emissivity is independent of wavelength. This approach has come to be known as two-color ratio thermometry [1], [2], [3] . If two bands are better than one, it stands to reason that more bands should be even more advantageous.…”

Section: Introductionmentioning

confidence: 99%

Absolute temperature measurements using a two-color QWIP focal plane array

et al. 2010

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The infrared photon flux emitted by an object depends not only on its temperature but also on a proportionality factor referred to as its emissivity. Since the latter parameter is usually not known quantitatively a priori, any temperature determination based on single-band radiometric measurements suffers from an inherent uncertainty. Recording photon fluxes in two separate spectral bands can in principle circumvent this limitation. The technique amounts to solving a system of two equations in two unknowns, namely, temperature and emissivity. The temperature derived in this manner can be considered absolute in the sense that it is independent of the emissivity, as long as that emissivity is the same in both bands. QmagiQ has previously developed a 320x256 midwave/longwave staring focal plane array which has been packaged into a dual-band laboratory camera. The camera in question constitutes a natural tool to generate simultaneous and independent emissivity maps and temperature maps of entire two-dimensional scenes, rather than at a single point on an object of interest. We describe a series of measurements we have performed on a variety of targets of different emissivities and temperatures. We examine various factors that affect the accuracy of the technique. They include the influence of the ambient radiation reflected off the target, which must be properly accounted for and subtracted from the collected signal in order to lead to the true target temperature. We also quantify the consequences of spectrally varying emissivities.

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Infrared Optical Fiber Sensors

Saito

Kikuchi

1997

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Temperature measurements utilizing two-bandpass fiber optic radiometry

Cited by 9 publications

References 1 publication

Fiber optic infrared multispectral radiometers for emissivity and temperature measurements of gray bodies near room temperatures

Fiber optic infrared multispectral radiometers for emissivity and temperature measurements of gray bodies near room temperatures

Absolute temperature measurements using a two-color QWIP focal plane array

Infrared Optical Fiber Sensors

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