Alain Sommier

Alain Sommier
Institut de Mécanique et d'Ingénierie de Bordeaux | I2M Bordeaux · TREFLE

IR CNRS

About

128
Publications
24,191
Reads
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688
Citations
Additional affiliations
September 2012 - present
Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)
Position
  • Professor (Assistant)
Description
  • Heat and mass transfer in food process
September 2008 - present
Institut de Mécanique et d'Ingénierie de Bordeaux
Position
  • Engineer
September 2000 - August 2008
AgroParisTech
Position
  • Engineer
Education
January 1995 - June 1998
University of Nantes
Field of study
  • Sciences pour l'ingénieur

Publications

Publications (128)
Article
Full-text available
Knowledge of material emissivity maps and their true temperatures is of great interest for contactless process monitoring and control with infrared cameras when strong heat transfer and temperature change are involved. This approach is always followed by emissivity or reflections issues. In this work, we describe the development of a contactless in...
Article
Conservation of artworks is of paramount importance nowadays around the world. Clever conservation by using non-destructive testing (NDT) techniques is highly appreciated by restorers and art historians. Among these, a special set-up working into the infrared region is the flying spot laser thermography technique that uses a punctual stimulus to tr...
Preprint
Full-text available
Knowledge of material emissivity maps and their true temperatures is of great interest for contactless process monitoring and control with infrared cameras when strong heat transfer and temperature change are involved.In this work, we describe the development of a contactless infrared and multispectral imaging technique based on the pyro-reflectome...
Article
In this paper, a method based on Bayesian inference is proposed to conjointly estimate the following two fields of thermophysical parameters. The first is a thermal characteristic time directly linked to the thermal diffusivity and the thickness, whereas the second is the Biot number, which is directly linked to the heat loss and thermal conductivi...
Article
Full-text available
Knowledge of the spatial and temporal distribution of heat flux is of great interest for the quantification of heat sources. In this work, we describe the development of a new ultra-broadband contactless imaging power meter based on electromagnetic to infrared technology. This new sensor and the mathematical processing of images enable the reconstr...
Article
Full-text available
In this work, a novel image-based method is presented to characterize the heat and mass transfer rates in a Hele-Shaw microfluidic reactor. A Fourier transform infrared (FTIR) spectrometer is used in transmission mode in combination with an infrared (IR) camera to simultaneously measure the molar concentration and the thermal fields in the microflu...
Article
In this paper, we addressed the problem of quantitatively measuring the profile of bilayer media. A contactless thermal profilometry method is proposed. Concretely, this approach corresponds to measuring the interface between two media of a material. An experimental setup is proposed, and a methodology is presented to estimate the profile . Two exa...
Conference Paper
Full-text available
La torche à plasma est un type de source qui génère de très hautes températures et flux, qui nécessite d'être caractérisée en vue de leur optimisation énergétique. La mesure de ces hautes températures implique l'utilisation de méthodes non intrusives. Une méthode basée sur la spectroscopie IR permettant la mesure simultanée de l'émissivité et de la...
Article
Full-text available
This work reports a multispectral tomography technique in transmission mode (called 3DITI for 3D Infrared Thermospectroscopic Imaging) based on a middle wavelength infrared (MWIR) focal plane array. This technique relies on an MWIR camera (1.5 to 5.5 μm) used in combination with a multispectral IR monochromator (400 nm to 20 μm), and a sample mount...
Article
This study has illustrated the potentials of optical and THz infrared thermography in the identification of inserts of different nature in glass fiber reinforced polymer. The inspection efficiency has been comparatively evaluated by applying the Tanimoto criterion. The best test procedure has proven to be one-sided stationary thermal nondestructive...
Book
With the aid of a grant ADEME-TOTAL, we instrumented a filtering centrifuge to model the coupling of mechanical dewatering and thermal drying by microwave. Our objectives are the optimization of energy consumption of coupled process and the demonstration that the coupled process can be more efficient than convective drying regarding energy consumpt...
Article
Full-text available
The aim of the present work is to propose a methodology for the use of thermoelectric modules (TEM) as an alternative to conventional heat flux sensors, for estimating convective and radiative heat flux. In this experimental study, the performance of TEMs as heat flux sensors is compared to that of the heat flux sensor (HFS), a type of conventional...
Article
The main goal of this paper is the estimation of thermal resistive fields in multilayer samples using the classical front face flash method as excitation and InfRared Thermography (IRT) as a monitoring sensor. The complete inverse processing of a multilayer analytical model can be difficult due to a lack of sensitivity to certain parameters (layer...
Article
Full-text available
In this paper, the problem of the quantitative characterization of thermal resistance fields in a multilayer sample is addressed by using the classical front face flash method as the thermal excitation and infrared thermography (IRT) as the monitoring sensor. In this challenging problem, the complete inverse processing of a multilayer analytical mo...
Article
Full-text available
The front face photothermal radiometry technique has been improved in order to estimate the thermal conductivity of thin films with better accuracy compared to existing techniques. The experimental procedure is based on the front face response to a nanoseconds laser pulse repeated periodically at high frequency, i. e., a Dirac comb waveform. Averag...
Article
A new process for extraction of essential oils from orange peels (Citrus sinensis L.) using microwave and centrifugal (MW/C) force was studied. MW/C is a combination of microwave heating to explode the internal cells of biological material, and centrifugation to intensify diffusion, collection and separation of compounds of interest. MW/C is perfor...
Article
Full-text available
The domain of non-destructive testing (NDT) or thermal characterization is currently often done by using contactless methods based on the use of an IR camera to monitor the transient temperature response of a system or sample warmed by using any heat source. Though many techniques use optical excitation (flash lamps, lasers, etc.), some techniques...
Article
Full-text available
Non-destructive testing (NDT) of materials and structures is a very important industrial issue in the fields of transport, aeronautics and space as well as in the medical domain. Active infrared thermography is an NDT method that consists of providing an external excitation to cause an elevation of the temperature field in the material, consequentl...
Article
We have obtained an analytical expression for the surface temperature of a sample that is moving at constant velocity when it is illuminated by a modulated and focused laser beam, which remains at rest. From this expression it is found that while the temperature amplitude thermogram shows the expected elongated shape in the direction of the sample...
Article
Full-text available
The Flying-Spot infrared thermography was introduced more than twenty years ago to detect narrow cracks. Recent progress made in optical control, lasers and infrared cameras allows extending the Flying-Spot technique for a quantitative thermal analysis. In this work, we propose a Constant Velocity Flying Spot to measure the in-plane thermal diffusi...
Conference Paper
Full-text available
Considering the use of Peltier modules as alternatives to conventional flux meters, an experimental evaluation comparing these two types of sensors is discussed here. The interest in performing this evaluation lies in the difference in the cost and the higher thermoelectric power of Peltier modules compared to conventional flux meters. The results...
Article
Constant Velocity Flying-Spot thermography consists in scanning the sample surface by a focused CW-laser spot moving at constant speed. This technique was designed to study large surfaces in short times. In this work, we propose a method, based on a Flying-Spot thermography setup, to size the width of vertical cracks by fitting the temperature prof...
Conference Paper
Full-text available
This paper deals of limestone samples electrical resistivity measurements technique. It uses carbon plate electrodes as both current injection electrodes and potential electrodes. The data treatments uses a modified Archie's law inspired from Glover works. We showed that the samples resistivity is close to the one we measured on site.
Chapter
This chapter aims at introducing basic features of dielectric heating and to present the applications in the food industry. Based on a literature survey of recent works, many examples are given to highlight the main advantages of the microwave (MW) technology in food processing. The case of most processes involving heating is addressed. From anothe...
Book
This chapter aims at introducing basic features of dielectric heating and to present the applications in the food industry. Based on a literature survey of recent works, many examples are given to highlight the main advantages of the microwave (MW) technology in food processing. The case of most processes involving heating is addressed. From anothe...
Article
In this work, an infrared thermography setup is proposed to measure the in-plane thermal diffusivity of (an)isotropic samples that are moving at constant velocity, as it is the case of in-line production or in-line quality control processes in factories. The experiment consists in heating the moving sample with a focused laser spot, which remains a...
Article
Full-text available
THz waves have shown to be effective for several applications, such as security, non-destructive testing, and water content monitoring for porous materials and food products. This study aims to highlight the use of THz radiation to measure temperature variations of thin insulating materials opaque in the visible or IR range (PVC, PTFE, PMMA, and wo...
Article
In a previous work we developed methods based on Pulsed Flying Spot (PFS) to measure the in-plane thermal diffusivity of (an)isotropic materials. Due to the optical laser scanning system, the effective measurement area is around 5 cm x 5cm) to obtain a good spatial resolution and to ensure accurate estimated thermal fields. First, to extend the pre...
Article
Measuring and modelling the permeability of tight rocks remains a challenging task. In addition to the traditional sources of errors that affect more permeable formations (e.g. sample selection, non-representative specimens, disturbance introduced during sample acquisition and preparation), tight rocks can be particularly prone to solid–fluid inter...
Article
Measuring the permeability of tight rocks remains a challenging task. In addition to the traditional sources of errors that affect more permeable formations (e.g. sample selection, non-representative specimens, disturbance introduced during sample acquisition and preparation), tight rocks can be particularly prone to solid–fluid interactions and th...
Article
A new process design and operation for the extraction of polyphenols from fresh lettuce was developed. Microwave assisted centrifugation (MW/C) is a combination of microwave heating to explode the internal cells of biological material containing secondary metabolites, and centrifugation to intensify diffusion, collection and separation. MW/C is per...
Article
This paper presents experimental results of an air-PCM heat exchanger, with an in-line arrangement of cylindrical containers. The objective is to highlight the physical phenomena occurring in a single container during the phase change. Temperature and airflow measures were carried out. These values were used to find the heat exchanges on the contai...
Conference Paper
Full-text available
The performance of a natural ventilation strategy, in a full-scale enclosure under meteorological conditions is studied through an experimental study, a buoyancy-driven approach, by means of the estimation of the air exchange rate per hour and ventilation power. A theoretical and an empirical model are proposed based on the airflow theory in buildi...
Article
Full-text available
Recently, THz waves have been shown to be an effective technique for investigating the water diffusion within porous media, such as biomaterial or insulation materials. This applicability is due to the sufficient resolution for such applications and the safe levels of radiation. This study aims to achieve contactless absolute water content measurem...
Article
Non-destructive thermal diagnosis of walls is a crucial theme for the renovation of old buildings, the examination of building structures and the accreditation of new buildings. Nevertheless, there are very few diagnostic methods for the characterization of thick walls. In this study, an innovative approach that combines terahertz radiation method...
Article
The purpose of this article is to present a new calibration procedure for spectroscopic measurements using an infrared focal plane array (IRFPA) spectrometer on highly opaque middle-wave infrared (MWIR) media. The procedure is based on the properties of the IRFPA camera and especially the integration time (IT), which is the main parameter that can...
Conference Paper
Dans de nombreux procédés industriels, la séparation liquide/solide est réalisée par une combinaison de procédés mécaniques et thermiques (séchage) qui se traduisent par une faible teneur en eau résiduelle (ou solvant) dans le produit. Le couplage des effets mécaniques et thermiques offre de nombreux d'avantages : investissement réduit, productivit...
Conference Paper
Heat-sink materials are currently under investigation as they could allow increasing power densities in microelectronic components as well as promote the miniaturization of such devices. Materials with high thermal conductivities and low coefficients of thermal expansion (CTE) are suitable for this type of application. Currently Cu or Al heat sinks...
Conference Paper
Recently, THz waves shows to be a good technique to investigate the water diffusion within porous media such as biomaterial or insulation materials. This is due to the sufficient resolution for such applications and safe radiation. In this study, a calibration method is developed in order to demonstrate the relationship between the absorption coeff...
Article
A novel thermal non-destructive technique based on a Pulsed Flying Spot is presented here by considering in-plane logarithmic processing of the relaxing temperature field around the heat source spot. Recent progress made in optical control, lasers, and infrared cameras permits the acquisition of 2D temperature fields and localized thermal excitatio...
Article
An experimental device based on the measurement of the heat flux dissipated during chemical reactions, previously validated for monitoring lipid oxidation in plant oils, was extended to follow lipid oxidation in water-in-oil emulsions. Firstly, validation of the approach was performed by correlating conjugated diene concentrations measured by spect...
Article
This work aims to achieve contactless absolute-temperature measurements of infrared-semi-transparent solids using an infrared thermal and spectroscopic imaging technique. The multispectral thermo-transmittance coefficient fields in the 3–5 μm wavelength range for Sapphire, KBr, and Silicon are determined to be 6 × 10⁻⁴ K⁻¹, 4 × 10⁻⁴ K⁻¹, and −3 × 1...