Diffractive optical element–based glossmeter for the on-line measurement of normal reflectance on a printed porous coated paper

Oksman, Antti; Kuivalainen, Kalle; Tåg, Carl-Mikael; Juuti, Mikko; Mattila, Rauno; Hietala, Eero; Gane, Patrick; Peiponen, Kai–Erik

doi:10.1117/1.3567057

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…In addition to this, the finishing processes employed to achieve specific type of paper make the material inhomogeneous at micrometer scale which is comparable to skin in terms of complexity. By this definition of complexity, we believe the DOE-based handheld glossmeter (this glossmeter is practically speaking the same which was developed for online real time measurements of gloss change of prints over paper in printing house environment [18]) can as well be used as a novel tool in the study of skin gloss. Implementing the definition of statistical average gloss in Eq.…”

Section: Methodsmentioning

confidence: 99%

Scanning of skin gloss by a diffractive optical element-based handheld glossmeter

Asamoah

Peiponen

2018

Opt Rev

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Skin specular gloss (referred to as "gloss'') determination is important in dermatology and cosmetic industry as it gives an indication of the skin health and beauty. Its accurate determination is, therefore, necessary. Commercially available glossmeters typically employ large incidence angle geometry, large illumination area, and fixed point measurements making them impractical regarding measurement of curved and complex non-planar objects or surfaces as well as low gloss regime such as the skin. In this study, we have demonstrated the novel application of a diffractive optical element-based handheld glossmeter with scanning capability, overcoming the disadvantages of conventional glossmeters, in the accurate determination of skin gloss and gloss profile for different skin types under different measurement conditions. Different parts of the body (back of the hands, the inner part of the arm and the forehead) of four volunteers with light, dark and intermediate skin types were scanned (also in different directions) to obtain the skin gloss profile and the statistical average skin gloss. Additionally, the skin surface was modified by arm extension and scanned as well. Our preliminary results showed that the statistical average skin gloss reading increased with the increasing lightness of skin. Areas with higher sebaceous glands (forehead) showed higher gloss reading than the other body parts (inner arm and back of the hand). However, the roughness of the skin surface decreased the statistical average skin gloss reading. The handheld scanning skin glossmeter allows for the accurate determination of skin gloss with sensitivity to small variation in the skin surface roughness with high repeatability.

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Section: Methodsmentioning

confidence: 99%

Scanning of skin gloss by a diffractive optical element-based handheld glossmeter

Asamoah

Peiponen

2018

Opt Rev

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“…Optical reflectance measurement has a wide range of applications, including studying the optical adsorption of polymers, investigating the optical properties of surface coatings, and analyzing the optical characteristics of biological tissues [1][2][3][4]. For diverse needs, different instruments, such as an integrating sphere reflectometer, laser polarimeter, and glossmeter, have been used to measure the reflectance [5][6][7][8]. Surface reflectance can be significantly influenced by microroughness, microstructures, and complex materials [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Reflectance Measurement Using an Astigmatic Optical Profilometer

Liao

Huang

Syu-Gu

et al. 2022

Sensors

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An astigmatic optical profilometer with a commercial optical pickup head provides benefits, such as high resolution, compact size, and low cost. To eliminate artifacts caused by complex materials with different reflectances, a z-axis modulation mode is proposed to obtain quantitative surface morphology by measuring S curves on all image pixels. Moreover, the slope of the linear region in the S curve shows a positive relationship with the surface reflectance. However, the slope was calculated using an offline curve fitting method, which did not allow real-time reflectance imaging. Furthermore, quantitative reflectance data were unavailable because of the lack of calibration. In this study, we propose a novel method for real-time reflectance imaging by measuring the amplitude of a focus error signal (FES). The calibration results displayed a linear relationship between the FES amplitude and reflectance. The reflectance image of a grating sample with chrome patterns on a glass substrate demonstrates accurate reflectance measurements with a micrometer spatial resolution.

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“…The motivation behind this paper is to study the use of two different glossmeters, which are based on the use of diffractive optical element (DOE) for the detection of surface quality of authentic and counterfeit tablets (theory, technical details and industrial applications of the DOE-based glossmeters are presented in [11][12][13]). For this purpose, we have studied the surface properties of commercially available antimalarial tablets.…”

Section: Introductionmentioning

confidence: 99%

Gloss measurement in detection of surface quality of pharmaceutical tablets: a case study of screening of genuine and counterfeit antimalaria tablets

Bawuah

Pääkkönen

Peiponen

2017

J. Eur. Opt. Soc.-Rapid Publ.

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Background: 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. Methods: 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. Results: 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. Conclusions: 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.

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Diffractive optical element–based glossmeter for the on-line measurement of normal reflectance on a printed porous coated paper

Cited by 3 publications

References 16 publications

Scanning of skin gloss by a diffractive optical element-based handheld glossmeter

Scanning of skin gloss by a diffractive optical element-based handheld glossmeter

Real-Time Reflectance Measurement Using an Astigmatic Optical Profilometer

Gloss measurement in detection of surface quality of pharmaceutical tablets: a case study of screening of genuine and counterfeit antimalaria tablets

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