Near infrared thermography with silicon FPA - Comparison to MWIR and LWIR thermography

Abstract

An ideal thermographic camera could be defined as an uncooled system with high spatial and thermal resolutions featuring a video frame rate, and a short calibration process. In this paper a measurement system based on Silicon FPA operating in the Near Infrared spectral band (0.7 − 1.1 µm) is proposed. This system offers an excellent spatial resolution, a low cost and compactness. With a specific radiometric model, this system can accurately measure temperatures, in a broad temperature range, from 400 up to 1000°C. A comparison with two commercial infrared cameras is performed between 400 and 700°C.

Review of thermal imaging systems in composite defect detection

“…The skin layers of the sample P4V are made of glass fiber reinforced polymer (GFRP), meanwhile the layers of the sample P4C are made of carbon fiber reinforced polymer (CFRP) (see Figs. [1][2][3][4][5].…”

“…Gavrilov et al [6] made a comparison of near and mid infrared ban reflectography for art diagnosis, field in which the near-infrared is more used. A comparison to MWIR and LWIR of the near infrared thermography was made by Rotrou et al [4], the paper is centered in the Silicon Plane Array of the near infrared camera and presents a calibration procedure for the cameras that are compared. However, a direct comparison of both technologies for active detection of defects in composite materials has not been realized yet, which is the main objective of this work.…”

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

“…• 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.…”

“…1 In this paper, only CCD cameras are dealt with but CMOS cameras have also been investigated [21,22]. If the non linearity and non uniformity are not corrected, this can affect the difference of temperature between two adjacent points, which can be a serious problem to compute thermal gradients [22].…”

New approach on determination of emissivity fields using bicolor reflectometry technique

“…The radiometric model describes the relation between the radiance temperature and the gray level value delivered by the camera. In the NIR spectral band, a specific radiometric model, based on the introduction an effective wavelength which depends on temperature, is required [11] and is given by equations (10) and (11).…”