Real time multispectral high temperature measurement: Application to control in the industry

Mériaudeau, Fabrice

doi:10.1016/j.imavis.2006.04.019

Cited by 66 publications

(27 citation statements)

References 10 publications

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“…The rapid development of silicon-based cameras makes the temperature measurement in near infrared spectral ranges possible [13][14][15][16]. Silicon-based cameras are not only operating in the visible spectral ranges (0.4-0.7 μm), but also operating in near infrared spectral ranges (0.7-1.1 μm) [17,18]. Thus, they can be used to measure thermal fields.…”

Section: Introductionmentioning

confidence: 99%

Application of silicon-based camera for measurement of non-homogeneous thermal field on realistic specimen surface

Zhang

Marty

Maynadier

et al. 2019

Applied Thermal Engineering

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The high-cost low-resolution infrared cameras operating in middle infrared spectral ranges are widely used to detect the thermal fields. In this study, a low-cost high-resolution silicon-based sensor camera operating in near infrared spectral ranges is used to perform the observation of the thermal fields on the realistic specimen surface. In near-infrared spectral ranges, a small temperature variation led to a large modification in the sensor illumination, inducing acquired images with over saturation or poor dynamic range of gray levels. To address this problem, an algorithm was used to precisely adjust the exposure time to acquire images with constant gray level whatever the temperature evolution is, and then used in heating experiment of a steel specimen. Results showed that images with constant gray level could be acquired during the experiment. A special radiometric model was used to perform near-infrared thermography. Based on this radiometric model, the thermal fields on steel specimen surface were successfully reconstructed without measuring surface emissivity.

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Section: Introductionmentioning

confidence: 99%

Application of silicon-based camera for measurement of non-homogeneous thermal field on realistic specimen surface

Zhang

Marty

Maynadier

et al. 2019

Applied Thermal Engineering

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“…In order to avoid these drawbacks, the near infrared (NIR) measurement methods have also been developed. [20][21][22] Their use (for the steel industry, [23] for example, or a hot specimen in an aggressive environment [24] ) has been greatly improved in the recent years.…”

Section: Introductionmentioning

confidence: 99%

Validation of a multimodal set‐up for the study of zirconium alloys claddings' behaviour under simulated LOCA conditions

Campello

Tardif

Desquines

et al. 2018

Strain

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In a previous paper, Campello et al. presented a combined experimental/numerical approach to identify the creep behaviour of as‐fabricated Zircaloy‐4 claddings under simulated LOCA conditions. The current paper deals with the uncertainties and errors estimation of the two key methods used to measure the thermal and kinematic full fields during the creep tests: near infrared thermography (NIRT) and two‐dimensional digital image correlation (2D‐DIC). The NIRT uncertainties are evaluated as 0.7% of the actual temperature. They are mainly due to the thermocouple measurements used to calibrate the radiometric model of the NIRT. A combined 2D‐DIC/edge detection approach is proposed to quantify the error related to 2D‐DIC when measuring the ballooning of the tubular specimen. The 2D‐DIC error is evaluated as 0.1% of the actual equivalent strain even for ballooning inducing a radius increase of 20%.

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“…Using a Near Infrared Radiation spectral range to measure high temperatures is known in the literature [1][2][3][4]. High temperature object monitoring is the main application of such systems, e.g.…”

Section: Introductionmentioning

confidence: 99%

Automatic Adjustment of Integration Time in the NIR Camera for Calibrated Temperature Measurement during Inductive Heating Processes

Więcek¹,

Zgraja²,

Sankowski³

2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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The system presented is based on a Near Infrared Radiation (NIR) camera. The CCD camera selected absorbs a small portion of radiation in the near infrared range, above = 700 nm. In addition, by using an NIR filter one can cut off the visible light to reduce noise and unwanted radiation. The system has been developed at the Institute of Applied Computer Science, Lodz University of Technology. This system has been made for controlling industrial thermal processes during the inductive heating hardening. The varying of camera integration time has been applied to avoid the saturation and to increase the sensitivity at a low temperature. The emissivity of the inductive heating object has been taken into account. New algorithms for temperature calibration and image processing have been developed enabling the measurement of temperatures from 250°C, thanks to the application of automatic adjustment of integration time.

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Real time multispectral high temperature measurement: Application to control in the industry

Cited by 66 publications

References 10 publications

Application of silicon-based camera for measurement of non-homogeneous thermal field on realistic specimen surface

Application of silicon-based camera for measurement of non-homogeneous thermal field on realistic specimen surface

Validation of a multimodal set‐up for the study of zirconium alloys claddings' behaviour under simulated LOCA conditions

Automatic Adjustment of Integration Time in the NIR Camera for Calibrated Temperature Measurement during Inductive Heating Processes

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