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|The non-contact, in-depth profiling in fresh tomatoes
Bicanic, D.D. ; Hooft, J. van der; Gibkes, J. ; Chirtoc, M. ; Buijnsters, I. - \ 2007
Evidencing molecular associations in binary liquid mixtures via photothermal measurements of thermophysical parameters
Neamtu, C. ; Dadarlat, D. ; Chirtoc, M. ; Sahraoui, A.H. ; Longuemart, S. ; Bicanic, D.D. - \ 2006
Instrumentation Science and Technology 34 (2006)1-2. - ISSN 1073-9149 - p. 225 - 234.
photopyroelectric method - thermal-diffusivity
The back photopyroelectric (PPE) configuration, with opaque sample and thermally thick sample and sensor, was applied in order to obtain room temperature values of the thermal diffusivity of some liquid mixtures. The methodology is based on a sample's thickness scan, and not on a frequency scan as is usually the case. The possibility of precisely controlling the sample's thickness variation leads to very accurate and reproducible values for the thermal diffusivity. The method is proposed as an alternative for evidencing molecular associations in binary liquid mixtures
Rapid, non-destructive and non-contact inspection of solid foods by means of photothermal radiometry; thermal effusivity and initial heating coefficient
Gijsbertsen, A. ; Bicanic, D.D. ; Gielen, J.L.W. ; Chirtoc, M. - \ 2004
Infrared Physics & Technology 45 (2004)2. - ISSN 1350-4495 - p. 93 - 101.
CO2-laser photothermal radiometry (PTR) was demonstrated to be suitable for the nondestructive and non-contact characterization (both optical and thermal) of solid phase agricultural commodities (fres vegetables, fruits) and confectionery products (candy).
Comparison of some physical techniques for detection of spoilage in apple juice inoculated with Saccharomyces cerevisiae: Optical and photothermal methods
Chirtoc, I. ; Chirtoc, M. ; Bicanic, D.D. ; Cozijnsen, J.L. ; Breeuwer, P. - \ 2003
Instrumentation Science and Technology 31 (2003)3. - ISSN 1073-9149 - p. 211 - 229.
signals - haze
Several physical techniques were used to study the extent of spoilage in apple juice deliberately inoculated with yeast (concentration of Saccharomyces cerevisiae ranged from 25 cells mL(-1) to 2.5 x 10(6) cells mL(-1), respectively) and their performance compared in terms of detection limit achieved. The optical methods used in this investigation rely on the measurement of either absorption [as is the case for classical spectrophotometry (SP) and the so called optothermal window (OW), a variant of a photothermal method], or scattering [examples are turbidimetry (TB), laser scattering (SC), and laser speckle fluctuation (SF)]. It is shown that the presence of yeast increases both optical absorption and scattering. The most favorable detection limit (25 cells mL(-1)) and a highest (nearly 10(4)) dynamic range, combined with a good linearity, were obtained with the experimental set-up for SC. In addition, the extent of correlation between different methods was determined using two markedly different reference substances, i.e., (i) the mixture of apple and blackcurrant juices, representing a strongly absorbing sample, and (ii) diluted (dilution factor of 103) milk as a strong scatterer. Finally, one has monitored the progress of a spontaneous spoilage process in the inoculated juices stored at 5degreesC under aerobic conditions.
Optothermal window method for on-line monitoring of decay kinetics of trans-á-carotene in thermally treated vegetable oils
Ganguli, O. ; Bicanic, D.D. ; BonifaSi', M. ; Nicoli, M.C. ; Chirtoc, M. - \ 2003
European Food Research and Technology 217 (2003)1. - ISSN 1438-2377 - p. 74 - 79.
oxidation - model
The optothermal window detection method at 488 nm was used to monitor on-line the concentration of trans-ß-carotene that was added to several vegetable oils after treating them at 200 °C in the presence of air for varying amounts of time. Results obtained for extra virgin oil show a direct proportionality between the rate constant describing the disappearance of trans-ß-carotene and the duration of thermal treatment. The rate constant for the decay of trans-ß-carotene in oils treated under identical conditions was also dependent on the type of oil. Trends and individual data are discussed in the light of a possible application of the method for the determination of the oxidative stability of vegetable oils.
Evaluation of antioxidative activity of some antioxidants by means of a combined optothermal window and a DPPH* free radical colorimetry
Buijnsters, M. ; Bicanic, D. ; Chirtoc, M. ; Nicoli, M.C. ; Min-Kuo, Y. - \ 2001
Analytical Sciences 17 (2001). - ISSN 0910-6340 - p. S544 - S546.
Comparative study of coating thickness determination in packaging composite materials using photothermal radiometry, photoacoustic and photopyroelectric methods
Chirtoc, M. ; Gibkes, J. ; Walther, H.G. ; Christ, A. ; Antoniow, J.S. ; Bicanic, D. ; Bozoki, Z. - \ 2001
Analytical Sciences 17 (2001). - ISSN 0910-6340 - p. S185 - S188.
Assessing the Extent of Oxidation in Thermally Stressed Vegetable Oils. Part l: Optical Characterization by Photothermal and Some Conventional Physical Methods
Bicanic, D. ; Doka, O. ; Luterotti, S. ; Bohren, A. ; Sikovec, M. ; Veldhuizen, B. van; Berkessy, O. ; Chirtoc, M. ; Franko, M. ; Szabo, G. ; Sigrist, M. - \ 2001
Analytical Sciences 17 (2001). - ISSN 0910-6340 - p. 547 - 549.
|Measurement of Coating Thickness Determination of Packaging Composite Materials by Means of Photothermal Radiometry, Photoacoustic and Photothermal Methods
Chirtoc, M. ; Gibkes, J. ; Walther, H.G. ; Antoniow, J.S. ; Bicanic, D. ; Bozoki, Z. ; Szabo, G. ; Bein, B. ; Pelzl, J. ; Kleebauer, M. ; Bader, H. - \ 2000
In: Book of Abstracts, 11th Topical International Meeting on PA and PT Phenomena, Kyoto, Japan, June 25-29, 2000. - Kyoto, Japan : Kyoto University Press, 2000 - p. 1 - 1.
|Evaluation of Antioxidative Activity of Some Food Antioxidants by Means of Combined Optothermal Window and DPPH* Free Radical Colorimetry
Buijnsters, M. ; Bicanic, D. ; Chirtoc, M. ; Nicoli, M.C. ; Min-Kuo, Y. - \ 2000
In: Book of Abstracts, 11th Topical International Meeting on PA and PT Phenomena, Kyoto, Japan, June 25-29, 2000. - Kyoto, Japan : University of Kyoto, 2000 - p. 1 - 1.
|Photothermal and Optical Investigation of Haze Formation in Fruit Juices
Chirtoc, M. ; Frandas, A. ; Bicanic, D. ; Miosen, H. ; Nagy, G. ; Notingher, I. - \ 1999
In: Photoacoustic and Photothermal Phenomena : Proceedings of the 10th Topical International Conference on Photoacoustic and Photothermal Phenomena, AIP Conference Proceedings 463, Rome, Italy, August 24-26, 1998 / Scudieri F. and BertolottiM. (eds.).- Woodburry, New York, US : American Institute of Physics Press, 1999. - ISBN 1-56396-805-3 - p. 649 - 651.
|Photothermal and optical investigation of haze formation in fruit juices: application of infrared photothermal spectroscopy in human nutrition.
Chirtoc, M. ; Frandas, A. ; Bicanic, D. ; Miosen, H. ; Nagy, G. ; Notingher, I. - \ 1998
In: 10th International Conference on Photoacoustic and Photothermal Phenomena, Rome, Italy - p. 523 - 524.
|Measurement of radiation induced localized absorption in chromatographic eluents by means of the CO laser and PZT pyroelectric detector.
Jalink, H. ; Bicanic, D. ; Chirtoc, M. - \ 1998
Instrumentation Science and Technology 26 (1998). - ISSN 1073-9149 - p. 305 - 314.
|Rayleigh-Benard-Marangoni instabilities during evaporation of aqueous alcohol solutions.
Chirtoc, M. ; Chirtoc, I. ; Frandas, A. ; Dadarlat, D. ; Bicanic, D. - \ 1998
Instrumentation Science and Technology 26 (1998). - ISSN 1073-9149 - p. 133 - 144.
Photopyroelectric study of thermal parameters of food and biological products.
Dadarlat, D. ; Neamtu, S. ; Copaescu, I. ; Morariu, V. ; Turcu, I. ; Chirtoc, M. ; Bicanic, D. ; Antoniow, J.S. ; Egee, M. - \ 1998
High Temperatures - High Pressures 30 (1998). - ISSN 0018-1544 - p. 189 - 194.
Infrared transient thermography for non-contact, nondestructive inspection of whole and dissected apples and of cherry tomatoes at different maturity stages.
Offermann, S. ; Bicanic, D. ; Krapez, J.C. ; Balageas, D. ; Gerkema, E. ; Chirtoc, M. ; Egee, M. ; Keijzer, K. ; Jalink, H. - \ 1998
Instrumentation Science and Technology 26 (1998). - ISSN 1073-9149 - p. 145 - 155.
|Processing of weak photothermal signals from the optothermal window (OW) cell: application to the determination of ammonium ion in water.
Chirtoc, M. ; Bicanic, D. ; Chirtoc, I. ; Lubbers, M. - \ 1998
Instrumentation Science and Technology 26 (1998). - ISSN 1073-9149 - p. 281 - 288.
|Photothermal Method Using a Pyroelectric Sensor for Thermophysical Characterisation of Agricultural and Biological Samples.
Frandas, A. ; Dadarlat, D. ; Chirtoc, M. ; Jalink, H. ; Bicanic, D. ; Paris, D. ; Antoniow, J.S. ; Egee, M. - \ 1997
In: ROMOPTO 97, Bucharest, Romania - p. 83 - 87.
|Optothermal Detection of Infrared Radiation Induced Absorption in Aqueous Solution of Carbohydrates: Lactose and Starch.
Favier, J.P. ; Bicanic, D. ; Doka, O. ; Chirtoc, M. ; Helander, P. - \ 1997
Journal of Agricultural and Food Chemistry 45 (1997). - ISSN 0021-8561 - p. 777 - 780.
|Applications of Photothermal Methods in Biophysics, Medicine and Ecology.
Chirtoc, M. ; Dadarlat, D. ; Frandas, A. ; Bicanic, D. - \ 1997
In: National Biophysics Conference, Cluj, Romania - p. 45 - 46.