9762 papers found
There are measurement challenges in measuring the lumens output of LED lamps under pulse current mode operation to evaluate the performance of LED lamps. This paper describes and validates integrating sphere measurements for lumens flux of LED lamp under pulse current mode operation. It also evaluates the performance of LED lamp dimming operation using pulse current mode operation
The main metrological ambiguity in transducers’ calibration protocols establishment is whether the unit is going to be regarded as an integrated device in a measurement system, or it will be examined as a standalone instrument. This dilemma is related to the quantity selection on which the procedure development is based and later the measurement uncertainty modelling is performed. Another issue is the appropriate selection of measurement points which are going to embrace the full range of input signals transformation. The discussion is experimentally verified with a real case study...
This paper presents a methodology for modern systems integration of a legacy infrastructure. Commissioned in 1992 this infrastructure is used for large/industrial flow meter calibration and R&DI in Hydrology and Hydraulics. A solution for linking legacy devices and hardware in a new distributed system architecture, that foster future upgrades and modernization of the infrastructure, is proposed. The presented case study aims to overcome, in the industry 4.0 era, the constrains and limitations of proprietary legacy field bus (Modbus Plus) and the monolithic SCADA legacy approach and to...
Measurement devices for form and roughness use the measurement probe that converts the displacement into an electrical signal. In addition to the form/roughness information, the measurement signal can contain undesirable noise due to mechanical, electrical, thermal, and other influences that can lead to an error in the measurement result. Given the growing demands to reduce measurement uncertainty, especially in the form and roughness measurement, noise is a limiting factor. In 2019 the EMPIR project entitled Traceability for contact probe and stylus instrument measurements (18PRT01...
Low quality of the air is becoming a major concern in urban areas. High values of particulate matter (PM) concentrations and various pollutants may be very dangerous for the human health and the global environment. The challenge to overcome the problem with the air quality includes efforts to improve healthy air not only by reducing emissions, but also by modifying the urban morphology to reduce the exposure of the population to air pollution. The aim of this paper is to analyze the influence of the green zones on air quality mitigation through measurements, and to identify the correlation...
Radon gas is the largest source of public exposure to naturally occurring radioactivity. Radon activity concentration maps, based on atmospheric measurements, as well as radon flux maps can help Member States to comply with the EU Council Directive 2013/59/Euratom and, particularly, with the identification of Radon Priority Areas. Radon can also be used, as a tracer, to improve Atmospheric Transport Models and to indirectly estimate greenhouse gas (GHG) fluxes. This is important for supporting successful GHG mitigation strategies. One approach to estimate GHG fluxes on local to regional...
Some of the problems that arise during the processing of the acquired photo are analyzed in this paper. The most commonly used software tools in image processing require binary photography, and its conversion into the binary form is required first. Conversion problems, and their proper solution, are key steps for further machine determination of dimensional accuracy. Removing smudges on binary photos and rotating displays for photo overlap methods are the problems that are solved in the work, in order to successfully prepare the photo with software for further determination of the...
Reliable and accurate blood pressure measurements using sphygmomanometers are indispensable in the diagnostic and treatment of hypertension. Unfortunately, testing of performance and accuracy of automated oscillometric sphygmomanometers is complicated, lengthy and expensive. Fact that the oscillometric sphygmomanometers are majority of the blood pressure measuring devices on today’s market makes the problem more pressing. EMPIR project adOSSIG built a physiologybased advanced blood pressure simulator with a goal of improving blood pressure measurements. This paper describes results of...
During the second Large Hadron Collider Long Shutdown, the Liquid Argon calorimeter of the ATLAS experiment at CERN has been upgraded with a new trigger readout electronics which provides digital information with higher granularity to the ATLAS trigger system. In particular the new LAr Trigger Digitizer Boards will process and digitize the "Super Cells" (group of readout calorimeters cells) and send the processed data to the back-end electronics. The Power Distribution Board is a mezzanine board that provides the power distribution to the LTDB.
In this paper, measurements on stainless steel AISI 304 workpiece using Coordinate measuring machine Carl Zeiss Contura G2 and 3D scanner RangeVision PRO are compared and analyzed. Dimensional control is conducted by measuring 11 faces and 9 cylinders. Length, diameter, cylindricity, flatness and parallelism are controlled for features of interest. Using Calypso software on CMM and GOM Inspect software for 3D scanned model are used for creating virtual measurement strategies and dimensional and GD&T control. Deviations of measuring results using both measuring systems are shown and...