Demonstration of near-infrared thermography with silicon image sensor cameras

Rotrou, Yann; Sentenac, Thierry; Maoult, Yannick Le; Magnan, Pierre; Farre, J.

doi:10.1117/12.605894

Cited by 6 publications

(12 citation statements)

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“…• C, using a blackbody source in a calibration situation and a 3-parameters radiometric model, the apparent temperature measurement accuracy is less than 1 • C at an observation distance of 1 m [20,21]. Using a 4-parameters radiometric model, the same performances can be reached in the range 300 to 1000 • C. Such performances for temperature measurements using off-the-shelf low-cost uncooled CCD cameras have been obtained thanks to the accurate radiometric modelling of the camera and because particular attention has been paid to each possible source of error.…”

Section: Temperature Measurementsmentioning

confidence: 99%

“…In [20,21], we have carried out some experiments on a metallic mould, with a uniform surface, heated from 300 to 650 • C. By assuming a constant emissivity equal to 0.8, true temperature field measurements have been obtained with an accuracy of ± 3…”

Section: Temperature Measurementsmentioning

confidence: 99%

“…• C [20]. In order to obtain a better temperature measurement accuracy, the non linearity of the detector photoresponse needs to be corrected.…”

Section: Ccd Camera Correctionsmentioning

confidence: 99%

“…The mould was heated at a temperature of 450 • C 2 These thermocouples were used in previous experiments [20] to determine the influence of spatial variations of the emissivity of the mould and its evolution with temperature. In the present experiments, they have been only used to provide the temperature mean values used for the estimation of the coefficient of thermal expansion of the mould (see section 7).…”

Section: Shape/temperature Measurementmentioning

confidence: 99%

“…The sensor is based on two off-the-shelf lowcost high-resolution uncooled Charge-Coupled-Device (CCD) cameras. Ther-3 mal measurements using this kind of camera is made possible thanks to our recent developments in the field of temperature measurements using CCD cameras [19][20][21][22]. These developments have permitted to measure temperatures higher than 300…”

Section: Introductionmentioning

confidence: 99%

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An Innovative Method for 3-D Shape, Strain and Temperature Full-Field Measurement Using a Single Type of Camera: Principle and Preliminary Results

et al. 2007

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An innovative technique for measuring both the shape, the displacement, the strain and the temperature fields at the surface of an object using a single stereovision sensor is proposed. The sensor is based on two off-the-shelf low-cost high-resolution uncooled CCD cameras. To allow both dimensional and thermal measurements, the sensor operates in the visible and near infrared (NIR) spectral band (0.7-1.1 µm), and a radiometric and geometric calibration of the sensor is required. This technique leads to a low-cost camera-based simplified instrumentation that gives simultaneously dimensional/kinematical and thermal field measurements.Key words: geometric camera calibration, radiometric camera calibration, shape measurements, strain measurements, temperature measurements, full-field measurements, stereovision, digital image correlation (DIC), stereo-correlation, 3-D metrology, experimental mechanics. Preprint submitted to Experimental MechanicsJune 2007 1 Introduction For temperature measurements, many sensors are also available, from the classical thermocouples up to more sophisticated non-contact sensors like infrared cameras or pyrometers [14,15]. Thus, getting the strains and temperature at the same time implies generally a multi-instrumentation of the set-up and it is not so easy to combine the measurements of various categories in order to get the strains and the temperature at a given point of the specimen surface. 2 classical thermocamera with the 3-D shape data provided by a stereovision sensor. Their technique requires three cameras (an IR camera and two CCD cameras for the stereovision sensor) and a specific calibration procedure is needed to perform the fusion of the thermal and kinematical data provided by two different types of cameras. Satzger et al. [17] propose to utilize an infrared camera with a fringe projection technique to obtain a cloud of 3-D points and

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Section: Temperature Measurementsmentioning

confidence: 99%

Section: Temperature Measurementsmentioning

confidence: 99%

“…• C [20]. In order to obtain a better temperature measurement accuracy, the non linearity of the detector photoresponse needs to be corrected.…”

Section: Ccd Camera Correctionsmentioning

confidence: 99%

Section: Shape/temperature Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Innovative Method for 3-D Shape, Strain and Temperature Full-Field Measurement Using a Single Type of Camera: Principle and Preliminary Results

et al. 2007

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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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An innovative technique for real-time adjusting exposure time of silicon-based camera to get stable gray level images with temperature evolution

Zhang

Marty

Maynadier

et al. 2019

Mechanical Systems and Signal Processing

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Silicon-based sensor cameras are known to be sensitive in the near infrared spectral range, in which a small temperature variation leads to a large modification in the image gray level. It induces acquired images with local saturation or poor dynamic range of gray levels. In order to address this problem, the present study proposes an innovative technique to precisely and automatically adjust the exposure time to obtain stable gray level images when the temperature evolution occurs on the surface of the observed object. Two algorithms, including linear algorithm and Planck's algorithm, are proposed to predict the exposure time to obtain stable gray level images. Blackbody heating experiment is conducted to validate the accuracy of these two algorithms, and the result indicates that stable gray level images can be obtained using Planck's algorithm. Moreover, this technique is applied to the specimen heating experiment, and the stable gray level images can also be obtained using Planck's algorithm. These two experimental results prove that the technique is effective and reliable. Finally, the thermal fields are reconstructed on images of blackbody.

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Demonstration of near-infrared thermography with silicon image sensor cameras

Cited by 6 publications

References 0 publications

An Innovative Method for 3-D Shape, Strain and Temperature Full-Field Measurement Using a Single Type of Camera: Principle and Preliminary Results

An Innovative Method for 3-D Shape, Strain and Temperature Full-Field Measurement Using a Single Type of Camera: Principle and Preliminary Results

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

An innovative technique for real-time adjusting exposure time of silicon-based camera to get stable gray level images with temperature evolution

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