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Optical measurements based on practical methods for detecting time-wise morphing structures
摘要： Nowadays non-contact measurement methods have become widely used systems in several fields especially robotics, aerospace, architecture, and cultural heritage. Practical devices, taken from mass markets, are increasingly being used in scientific and engineering research fields thanks to their ability to combine good accuracy with to the low-cost and ready-to-use experimental setup. In the present paper, digital image analysis (based on digital camera devices) and three-dimensional scanning technique (based on Kinect I and Kinect II sensors) are compared to evaluate their performance in detecting a time-wise shape modification. Digital camera and Kinect sensors are used to the non-contact detection of a morphing blade able to modify its geometry according to airflow temperature variation. The comparison showed the capability of the digital image technique to provide quantitative information when a proper alignment is adopted, while the three-dimensional scanning process allows the continuous blade detection useful to quantify the shape modification. Two-dimensional and three-dimensional blade shape reconstruction processes are also discussed.
关键词： Reverse Engineering,Non-contact measurement,Point cloud,Kinect sensor,Optical method,Digital image analysis
更新于2025-09-23 15:23:52
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A Novel Whole Spectrum-based Non-invasive Screening Device for Neonatal Hyperbilirubinemia
摘要： Objective: Careful screening of bilirubin level in newborns is mandatory as per American Academy of Pediatrics (2004), to reduce incidents of kernicterus and acute bilirubin encephalopathy. Although invasive capillary collection of blood and subsequent biochemical test is considered a gold standard for jaundice detection in neonates, transcutaneous bilirubin (TcB) measurement using various non-invasive instruments is also used sporadically across the globe. The major aim of this study was to develop a non-invasive spectrometry-based technique for measurement of neonatal bilirubin level as an alternative of total serum bilirubin (TSB) test without limitations of other available bilirubinometers. Methods: The instrument comprised of a light source and a spectroscopic detector. A light beam from source incident on the neonatal nail plate through optical fibers. The retro reflected light is acquired using the detector. An indigenously developed software used to acquire and analyze the optical signal and to calculate the bilirubin value. The instrument was calibrated and validated in reference to TSB on 1033 subjects. Major results: The result (r=0.95 and P<0.001), indicates a strong correlation between the bilirubin value obtained from our method and TSB. Time variant analysis of the subjects undergoing phototherapy provided a good correlation (r = 0.98). The repeatability test, result shows the mean coefficient of variation less than 5.0%. Conclusions: The indigenously developed non-invasive technique, successfully detects the bilirubin under various physiological conditions with high accuracy and precision.
关键词： non-invasive optical method,LabVIEW,diffuse reflection,Neonatal jaundice,whole spectrum-based diagnosis
更新于2025-09-23 15:22:29
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Fast optical method for characterizing plasmonic nanoparticle adhesion on functionalized surfaces
摘要： In this paper, a rapid optical method for characterizing plasmonic (gold) nanoparticle (AuNP) adhesion is presented. Two different methods were used for AuNP preparation: the well-known Turkevich method resulted in particles with negative surface charge; for preparing AuNPs with positive surface charge, stainless steel was used as reducing agent. The solid surface for adhesion was provided by a column packed with pristine or surface-modified glass beads. The size of the nanoparticles was studied by transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS); the surface charge of the components was determined by streaming potential measurements. The characterization of adhesion was performed in a flow system by UV-Vis spectroscopy. During the adhesion experiments, the role of the surface charge, the particle size, and the pH were studied, as well as the adhered amount of gold nanoparticles and the surface coverage values. The latter was estimated by theoretical calculations and defined by the quotient of the measured and the maximal adhered amount of nanoparticles, which could be determined by the cross-sectional area of the NPs and the specific surface area of the glass beads. The results are verified by the polarization reflectometric interference spectroscopy (PRIfS) method: silica nanoparticles with diameters of a few hundred (d~450) nanometers were immobilized on the surface of glass substrate by the Langmuir–Blodgett method, the surface was modified similar to the 3D (continuous flow packed column) system, and gold nanoparticles from different pH solutions were adhered during the measurements. These kinds of modified surfaces allow the investigation of biomolecule adsorption in the same reflectometric setup.
关键词： Adhesion,Reflectometric interference spectroscopy,Flow system,Optical method,Plasmonic nanoparticles,Surface charge
更新于2025-09-12 10:27:22
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The Study of the Surface Distribution of the Electrooptical Properties of the Medium by Reflected Light
摘要： The results of the experimental study of the surface distribution of the electrooptic coefficients of crystals LiNbO3, SBN and PLZT-ceramics are described. The induced birefringence in medium was created by an alternating field. The harmonic analysis of reflected laser light was used. The light was reflected from the front face of the transverse cell of the electro-optical medium. The transverse cells were made in the form of planar and three-dimensional flat capacitors. The homogeneity of the surface distribution of electro-optical coefficients of the medium is estimated.
关键词： estimation of homogeneity of surface distribution,distribution of electro-optic coefficients,reflective optical method
更新于2025-09-09 09:28:46