A 20-in (51-cm) diam schlieren system was convereted to a genrualized holographic flow visualization system. The system has been used successfully in producing the following types of visualization from a single holographic plate: three-dimensional photography, variable focus shadowgraph, variable knife-edge position schlieren, color-schlieren, and interferometry. All of these except for holographic color schlieren have previously been reported with varying degrees of success. This paper presents a technique for producing color schlierent photographs from holograms formed in the above system and shows preliminary results of the application. The method possesses a number of advantages over conventional color schlieren photography.
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http://dx.doi.org/10.1364/AO.8.002047 | DOI Listing |
Cancers (Basel)
August 2023
Department of Health Technology Implementation, TechMed Center, University of Twente, 7522 NB Enschede, The Netherlands.
Unintentional local temperature effects can occur during irreversible electroporation (IRE) treatment, especially near the electrodes, and most frequently near the tip. Partial electrical insulation of the IRE electrodes could possibly control these temperature effects. This study investigated and visualized the effect of partial electrical insulation applied to the IRE electrodes on the electric field line pattern and temperature gradient.
View Article and Find Full Text PDFSensors (Basel)
December 2022
Cuerpo Académico de Ingeniería en Agrotecnología, Universidad Politécnica del Bicentenario, Carr. Silao-Romita Km 2, San Juan de los Duran, Silao 36283, Guanajuato, Mexico.
Visualizing two variables in the fluid flow requires a complex optical system to fulfill such a purpose. Furthermore, in these applications, measuring the temperature fields of the fluid is sometimes necessary. In this work, we use a color digital camera to record in one snapshot shadowgraph and two direction sensitivity Schlieren images.
View Article and Find Full Text PDFIntern Emerg Med
November 2022
Internal Medicine, Angiology and Atherosclerosis-Department of Medicine and Surgery, Università Degli Studi Di Perugia, Piazzale Gambuli 1/8, 06124, Perugia, Italy.
Deep vein thrombosis (DVT) in critically ill patients still represents a clinical challenge. The aim of the study was to investigate whether a systematic ultrasound (US) screening might improve the management of the antithrombotic therapy in intensive care unit (ICU). In this non-randomized diagnostic clinical trial, 100 patients consecutively admitted to ICU of the University Hospital of Perugia were allocated either in the screening group or in the control group.
View Article and Find Full Text PDFVisualizing and quantifying certain variables are essential in fluid flow studies. If we add that these tasks should be achieved in great detail, it would be beneficial to implement optical techniques that would reveal these characteristics. Based on this premise, we present a z-schlieren setup that allows simultaneous recording of horizontal and vertical sensitivity schlieren images and shadowgraph images.
View Article and Find Full Text PDFSci Rep
August 2021
Department of Biological Physics, ELTE Eötvös Loránd University, Pázmány sétány 1, 1117, Budapest, Hungary.
There is a long-lasting debate about the possible functions of zebra stripes. According to one hypothesis, periodical convective air eddies form over sunlit zebra stripes which cool the body. However, the formation of such eddies has not been experimentally studied.
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