Search results for "optical sensing"

Materials and methods of signal enhancement for spectroscopic whole blood analysis: Novel research overview

2017

Abstract The early diagnosis of diseases is crucial for reducing morbidity and mortality and also for improving the quality of treatment process. Among various biological samples used to follow up the concentrations of disease markers, whole blood sensing can efficiently decrease analysis time by means of introducing methods with no pretreatment. In addition, the direct detection of markers in whole blood facilitates testing procedure and minimize the possibility of the loss of analytes in the process. Therefore, the assay of unprocessed whole blood is becoming increasingly important in clinical diagnostics and biomedical research. Incorporation of new advanced materials plays a major role …

Chromogenic and fluorogenic reagents for chemical warfare nerve agents' detection

2008

The ease of production, the extreme toxicity of organophosphorus-containing nerve agents, and their facile use in terrorism attacks underscores the need to develop accurate systems to detect these chemicals. Among different technologies we review here recent advances in the design of chromo-fluorogenic methods for the specific detection of nerve agents. Optical sensing (especially colorimetric detection) requires usually low-cost and widely used instrumentation and offers the possibility of so-called “naked eye detection”. Recent reported examples suggest that the application of chromo-fluorogenic supramolecular concepts for the chromogenic or fluorogenic sensing of nerve agents might be an…

An Optical Remote Sensor for Fingerprint Identification using Speckle Pattern

2017

The implementation of a simple, inexpensive optical device for remote fingerprint identification is presented. The sensor is based on temporal tracking of back-reflected secondary speckle patterns generated while illuminating a finger with a laser.

Opals infiltrated with a stimuli-responsive hydrogel for ethanol vapor sensing

2013

We report on a novel class of optical materials for ethanol vapor sensing, based on polystyrene opals infiltrated with an innovative stimuli responsive hydrogel. We describe the fabrication process of the bare polystyrene opals and their subsequent infiltration. The optical characterization of the photonic crystal templates was performed to prove the good quality of the samples. Measurements on the infiltrated opals showed that the transmission spectra in the visible range strongly change at varying concentrations of ethanol vapor. The fabricated structures show a linear optical response in the visible range, for high values of ethanol concentration.

Multidimensional Integral Imaging and Recognition in Degraded Environments

2018

We present an overview of our work on multidimensional integral imaging systems. Integral-imaging-based multidimensional optical sensing and imaging will be described for 3-D visualization, seeing through obscurations, material inspection, augmented reality, biomedical applications, and object recognition from microscales to long-range imaging.

Micro-circulation of skin blood: optical monitoring by advanced photoplethysmography techniques

2003

Blood micro-circulation in upper skin layers has been studied experimentally in real time by advanced two-channel photoplethysmography (PPG) techniques. The blood volume changes caused by micro-vessel expansion and dilution during the cardiac cycles have been detected by infrared optical contact sensors. A newly developed portable monitoring device comprising a lap-top computer was used for accumulation and processing of the bio-signals. Shapes of the PPG signals detected at different sites of the body were compared with these obtained by computer modeling.

Optical sensors for ethanol vapor based on polystyrene opals infiltrated with hydrogel

2013

This paper deals with a novel class of optical sensors for ethanol vapor, based on polystyrene opals infiltrated with a hydrogel sensitive to ethanol. Optical characterization of such opals has been performed, proving their effectiveness as sensors

Ethanol vapor optical sensors based on polystyrene opals infiltrated with hydrogel

2013

MSc course program on biomedical optics

1997

A new Msc study course program on biomedical optics has been developed and adapted. The program consists of three main parts. (1) Fundamentals of tissue optics, (2) Optical sensing for diagnostics and monitoring, (3) Laser-tissue interaction and laser treatment. The full program and some comments on it are presented.

Wearable PPG Sensor Matrix for Cardiovascular Assessment

2014

Wearable biomonitoring systems and smart textiles for healthcare are gaining more importance and significance in the R&D sphere due to their potentials in healthcare and sports. Such biomonitoring systems offer a number of advantages in comparison to the conventional equipment proving mobility of the wearer during a long-term monitoring of vital parameters. There are different options to set up the physiological monitoring using wireless and wearable technologies. One of the scenarios is addressing textiles as a carrier of electronics. Moreover, those differ by their functional applications, registered physiological parameters and technology solutions. Still, the most demanded biomonitoring…