Survey of emissivity measurement by radiometric methods

Honner, Milan

doi:10.1364/ao.54.000669

Cited by 65 publications

(30 citation statements)

References 53 publications

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“…Direct radiometric method techniques are well suited for high temperature since they usually involve less optics [22]. They are based on the direct evaluation of the definition of the emissivity provided in equation 3.…”

Section: Direct Methodsmentioning

confidence: 99%

A fast and versatile method for spectral emissivity measurement at high temperatures

Bakali

Gilblas

Pottier

et al. 2019

Review of Scientific Instruments

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In this paper, the development of a new device for high temperature emissivity measurement is described. This device aims at measuring both spectral and total emissivity for a thermal range of 600 to 1000°C. The device main targeted properties were both versatility and simplicity. To do so, a rigorous selection was made for each component: heating system, heat source, sample holder, measuring devices. Sample dimensions and the corresponding sample holder were optimized through a ray tracing model computation. Selection of sensors to compute a total emissivity was also especially discussed. A NIR spectrometer, and two MIR cameras covering [3-5] and [7.5-13]µm equipped with optical filters were chosen for spectral measurements. The major impediment was the separation between sample signal and various spurious signals emitted by environment. A specific measurement methodology was then made for each bandwidth to resolve this issue. A reference material was chosen for the device validation: Platinum. Spectral emissivity measurements were then compared to values from a commercial spectrometer. A good agreement was found for NIR and the first MIR band measurements and a higher error was seen in MIR second band which is explained by a less favorable signal to noise ratio. Integrated emissivity is then calculated and compared to values found in the literature. A good agreement between those values is found and similar trends with temperature are observed. The device is then validated for spectral and total emissivity measurement. Device versatility and simplicity allows an easy adaptation to a large area of applications.

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Section: Direct Methodsmentioning

confidence: 99%

A fast and versatile method for spectral emissivity measurement at high temperatures

Bakali

Gilblas

Pottier

et al. 2019

Review of Scientific Instruments

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show abstract

“…This technology allows detection of response radiation with a sensitivity of 100 to 1000 greater than the best thermal camera. In thermographic measurements, it is often very important to know or identify the emissivity of object, [4,5,6]. In general, determining this parameter may be complicated.…”

Section: S(t) = S(t) + N(t)mentioning

confidence: 99%

Detection of composite damage by IR NDT using ultrasonic and optic excitation

et al. 2019

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The submitted paper presents experience with detection of damaged composites by means of an ultrasonic excitation system in comparison with an optic system of excitation. In case of the ultrasonic excitation system is a high-frequency signal modulated by lock-in frequency. For a selection of the carrier signal we measured a response of a sample to sweep excitation and a sample resonance was defined by means of STFT. Consequently, the method lock-in was applied for detection. In case of the optic excitation system we applied several suitably selected frequencies with an aim to obtain information from various depths of the measured object. Results of measurements are presented in composite samples of CFRP.

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“…using lock-in method [3,7] to determination of change of temperature. In the case of determination of temperatures it is important to know the emissivity of the tested objects [8].…”

Section: Introductionmentioning

confidence: 99%

The contribution to the modal analysis using an infrared camera

et al. 2018

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Abstract. The paper deals with modal analysis using an infrared camera. The test objects were excited by the modal exciter with narrowband noise and the response was registered as a frame sequence by the high speed infrared camera FLIR SC7500. The resonant frequencies and the modal shapes were determined from the infrared spectrum recordings. Lock-in technology has also been used. The experimental results were compared with calculated natural frequencies and modal shapes.

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Survey of emissivity measurement by radiometric methods

Cited by 65 publications

References 53 publications

A fast and versatile method for spectral emissivity measurement at high temperatures

A fast and versatile method for spectral emissivity measurement at high temperatures

Detection of composite damage by IR NDT using ultrasonic and optic excitation

The contribution to the modal analysis using an infrared camera

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