The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform

R.c. Rowe - One of the best experts on this subject based on the ideXlab platform.

  • Gloss Measurement on film coated tablets
    Journal of Pharmacy and Pharmacology, 2011
    Co-Authors: R.c. Rowe
    Abstract:

    The Gloss of film coated tablets has been assessed using a commercially available specular Glossmeter modified to measure the specular reflectance of individual flat-faced, film-coated tablets. For all the pigmented film formulations studied, there was a decrease in Gloss with increasing pigment concentration, the magnitude of the decrease being dependent on the pigment used. Film coatings prepared using an aqueous coating system had a much lower Gloss reading than those prepared using an organic solvent coating system. Increasing the mean particle size of an inert filler particle resulted in a minimum Gloss reading at intermediate particle sizes, while increasing the polymer concentration resulted in a significant decrease in Gloss. In the latter case a power law equation was found to fit the data relating the percentage decrease in Gloss with the percentage increase in roughness. The results are consistent with the known theories of specular reflectance and illustrate the potential of this rapid and simple technique in the optimization of film formulation and process variables during product development.

Babu Varghese - One of the best experts on this subject based on the ideXlab platform.

  • high sensitivity optical Measurement of skin Gloss
    Biomedical Optics Express, 2017
    Co-Authors: Anna Ezerskaia, Arno Ras, Pascal J H Bloemen, S F Pereira, Paul H Urbach, Babu Varghese
    Abstract:

    We demonstrate a low-cost optical method for measuring the Gloss properties with improved sensitivity in the low Gloss regime, relevant for skin Gloss properties. The Gloss estimation method is based on, on the one hand, the slope of the intensity gradient in the transition regime between specular and diffuse reflection and on the other on the sum over the intensities of pixels above threshold, derived from a camera image obtained using unpolarized white light illumination. We demonstrate the improved sensitivity of the two proposed methods using Monte Carlo simulations and experiments performed on ISO Gloss calibration standards with an optical prototype. The performance and linearity of the method was compared with different professional Gloss Measurement devices based on the ratio of specular to diffuse intensity. We demonstrate the feasibility for in-vivo skin Gloss Measurements by quantifying the temporal evolution of skin Gloss after application of standard paraffin cream bases on skin. The presented method opens new possibilities in the fields of cosmetology and dermatopharmacology for measuring the skin Gloss and resorption kinetics and the pharmacodynamics of various external agents.

Fangsheng Lin - One of the best experts on this subject based on the ideXlab platform.

  • the research on the effect of spectral distributions on specular Gloss Measurement
    Seventh Symposium on Novel Photoelectronic Detection Technology and Applications, 2021
    Co-Authors: Fangsheng Lin
    Abstract:

    Specular Gloss is the perception by an observer of the shiny appearance of a surface. This perception changes whenever there is a change in the relative position or spectral distribution of the source, the sample, or the observer. However, the spectral distribution of the source in ISO 2813 is CIE standard illuminant C, which is different from CIE standard illuminant D65 and CIE standard illuminant A in JJG696-2015. During the Measurement, the reflected flux of the sample is influenced by the luminous reflectance of the sample and the spectral distribution of the source. This paper mainly analyses the influence of different spectral distributions on specular Gloss Measurement. Combined with the luminous reflectance of the sample in the wavelength range from400nm to 760nm, we theoretically and experimentally analyzed the difference of the specular Gloss values under the spectral distributions of CIE standard illuminant D65 and CIE standard illuminant A.

  • influencing factors and error analysis for specular Gloss Measurement
    8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test Measurement Technology and Equipment, 2016
    Co-Authors: Leibing Shi, Lei Lai, Fangsheng Lin, Dejin Yin, Ming Xia
    Abstract:

    Specular Gloss has been widely used to characterize the ability of a surface to reflect light specularly. Specular Gloss is theoretically related to the physical properties of a surface, such as roughness, directionality and uniformity. Specular Gloss, mainly determined by incident angle and refractive index of a surface, is a relative Measurement quantity. Specular Gloss is usually measured by a Glossmeter. The topographical and optical properties of a surface have been analyzed on how to affect the Measurements. The experiment results indicate that a less rough/flatter, more isotropic and more uniform surface will result in a more accurate Measurement value. Therefore, physical properties of a surface must be carefully inspected before the specular Gloss Measurement in order to acquire a satisfied result.

Peter Hanselaer - One of the best experts on this subject based on the ideXlab platform.

  • Development of an image-based Gloss Measurement instrument
    Journal of Coatings Technology and Research, 2019
    Co-Authors: Frédéric Bernard Leloup, Jan Audenaert, Peter Hanselaer
    Abstract:

    This paper reports on the development of a Measurement instrument to perform Gloss Measurements using an image-based detector. The image-based Gloss meter was built according to the specifications of the optical layout of a specular Gloss meter in a 60° Measurement geometry, as described in ASTM D523-14. The photodiode detector was thereby substituted with a CMOS detector. The optical layout of the system was designed and validated by the use of ray tracing software. A series of 16 matte to high-Gloss test samples, with nominal Gloss values ranging between 3 and 90 Gloss units, was used to compare specular Gloss Measurements obtained with the developed instrument and a commercial specular Gloss meter. An average and maximum deviation of only 1.2 and 2.7 Gloss units, respectively, was obtained, confirming the suitability of the system to perform standard specular Gloss Measurements. The potential benefits of the image-based approach were then studied. By way of example, the optical characterization of orange peel and contrast Gloss by the use of the system was discussed, corroborating the fact that the proposed instrument offers important opportunities for a more global characterization of the total Gloss impression.

Kai-erik Peiponen - One of the best experts on this subject based on the ideXlab platform.

  • Gloss Measurement in detection of surface quality of pharmaceutical tablets: a case study of screening of genuine and counterfeit antimalaria tablets
    Journal of the European Optical Society: Rapid Publications, 2017
    Co-Authors: Bawuah, Pertti Pääkkönen, Kai-erik Peiponen
    Abstract:

    The surface quality of pharmaceutical tablets plays an important role, especially in the drug release of a tablet and hence affects the bioavailability of the drug. Furthermore, important tablet’s properties such as coating uniformity and mechanical integrity that can be predicted based on the known surface properties manifest the inevitable link between a tablet’s surface property (e.g. Gloss, average surface roughness) and its efficacy. In this article, laboratory based and handheld Glossmeters as well as an optical profilometer were utilized for the detection of the surface properties of commercially available pharmaceutical tablets. As a case study, we measured the surface properties of authentic and counterfeit antimalarial tablets. Clear differences between authentic and fake tablets were detected based on the measured average surface roughness and Gloss values of the tablet samples. It is worth mentioning that this is the first time we have utilized both Glossmeters for the purpose of surface quality investigation of real pharmaceutical tablets. It is therefore suggested that the handheld Glossmeter is a useful device for quick inspection of tablet’s surface quality both in the production environments as well as for field screening of fake tablets.

  • definition and Measurement of statistical Gloss parameters from curved objects
    Applied Optics, 2010
    Co-Authors: Kalle Kuivalainen, Antti Oksman, Kai-erik Peiponen
    Abstract:

    Gloss standards are commonly defined for Gloss Measurement from flat surfaces, and, accordingly, Glossmeters are typically developed for flat objects. However, Gloss inspection of convex, concave, and small products is also important. In this paper, we define statistical Gloss parameters for curved objects and measure Gloss data on convex and concave surfaces using two different diffractive-optical-element-based Glossmeters. Examples of Measurements with the two diffractive-optical-element-based Glossmeters are given for convex and concave aluminum pipe samples with and without paint. The defined Gloss parameters for curved objects are useful in the characterization of the surface quality of metal pipes and other objects.