O. Ott, W. Sabuga, T. Konczak
The effect of the piston rotation rate on the gauge pressure measured by deadweight pressure balances was experimentally studied. Experiments were performed with a PTB twin primary gas pressure balance and several commercial gas and oil operated pressure balances with different configurations and size of rotating weights. It was found out that the piston rotation effect significantly depends on the distance between the horizontal surface of the rotating weights and the nearest fixed surface of the pressure balance.
TC16 Conference 2022
· TC16
· 2022
· 10.21014/tc16-2022.021
· Download
A. Rezki, Z. Silvestri, J-P. Wallerand, C. Guianvarc’h, M. Himbert
This paper presents the development, the operating principle, and the experimental results of an innovative technique for the measurement of acoustic pressures in the range of 40 mHz up to 5 Hz. This new measurement technique is based on the use of a Fabry Perot refractometer in which the air density variations related to an acoustic wave can be tracked and determined by measuring the optical frequency variations of a laser locked on a longitudinal mode of the Fabry Perot cavity. This approach covers a wider range in the low and infrasonic frequencies compared to conventional sensors.
TC16 Conference 2022
· TC16
· 2022
· 10.21014/tc16-2022.008
· Download
P. Wongthep, L. Sainoo
This paper describes the method used to characterize the zero-pressure effective area ( A 0 ) and pressure distortion coefficient ( λ ) of 200MPa-CCPG oil piston-cylinder unit (PCU) in order to realize the national pressure scale from 1.5 kPa to 500 MPa. The A 0 was determined by cross-floating method from a set of primary gas pressure standard, while the H-W method was used for calculating λ . A set of three oil PCUs was maintained as a primary pressure standard and used for scaling up and down pressure to determine λ for the other PCUs. The relative standard uncertainty of 200MPa-CCPG...
TC16 Conference 2022
· TC16
· 2022
· 10.21014/tc16-2022.007
· Download
R. Högström, M. Aspiala, J. Hämäläinen, S. Saxholm, T. Sillanpää, S. Nyyssönen
Precise knowledge of cylinder pressure is needed for optimizing engine performance. To ensure reliability of measurements, pressure sensors need to be calibrated at conditions that correspond to actual use, i.e., at dynamic conditions and elevated temperatures. VTT has developed a dynamic pressure calibrator based on reference sensor principle to enable cost-effective dynamic calibrations up to 35 MPa at temperatures up to 200 °C. Moreover, a novel cylinder pressure sensor that can withstand the harsh conditions inside an engine was developed and the performance was validated in laboratory...
TC16 Conference 2022
· TC16
· 2022
· 10.21014/tc16-2022.006
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R. Högström, S. Saxholm, C. Sarraf, G. Sutton, D. Lowe, S. Quabis, R. Wynands, G. Jönsson, P. Broberg, S. Sundarapandian, E. Amer, Y. Durgut, J. van Geel, W. Stiphout, A. Fateev, M. Liverts, C. Adolfse, A. Öster
This paper presents the main results and achievements of the EMPIR DynPT project. Dynamic measurement of pressure and temperature are a key requirement for process control in several demanding applications, such as automotive, marine and turbine engines, manufacturing processes, and ammunition and product safety. The quality of these measurement has been significantly improved in this project through development of dynamic measurement standards and methods and characterized sensor technologies and means of estimating measurement uncertainties in real process conditions.
TC16 Conference 2022
· TC16
· 2022
· 10.21014/tc16-2022.005
· Download
Rosario Morello, Claudio De Capua, Laura Fabbiano
This paper deals with the metrological issue of the reliability in measurements. The evaluation of intermediate precision is discussed to assure repeatable data over time. As an example, the monitoring process of archaeological or historic discoveries needs that data coming from different measurements and performed in different time instants are comparable and traceable. Thermography is used here to evaluate the conservation state of metallic artefacts and their decay over time. Data on the integrity of an ancient iron oil lamp have been collected at different points in time. Intermediate...
TC4 MetroArchaeo 2022
· TC4
· 2022
· 10.21014/tc4-ARC-2022.102
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Lara De Giorgi, Ivan Ferrari, Francesco Giuri, Giovanni Leucci, Giuseppe Scardozzi, Chiara Torre
The city of Nardò has Messapian origins (second half of the 8th - 3rd cent. BC) and and subsequently became the important Roman centre of Neretum. The the continuity of life up to the present day through the Byzantine, Angevin and Aragonese dominations conditions and limits the knowledge of the most ancient phases of occupation. Indeed, the archaeological evidence of the Messapian and Roman period is very limited. To investigate about the presence of buried archaeological remains some geophysical surveys were undertaken at the historical centre of Nardò. Particularly some areas in Umberto I...
TC4 MetroArchaeo 2022
· TC4
· 2022
· 10.21014/tc4-ARC-2022.101
· Download
Patrizia Capizzi, Raffaele Martorana, Mariella Marrone
The church of Santa Maria Maddalena d'Alga is located in the historic center of Palermo and belongs to the monumental complex of the military district of San Giacomo, in the ancient western fortified area of the city. Today the area hosts a vast military complex, seat of the Command of the Carabinieri Legion of Sicily. The church is elevated with respect to the current floor. During some maintenance works of the church, for the installation of air conditioners, some georadar surveys were carried out to verify the presence of crypts or tombs under the pavement. The investigations made it...
TC4 MetroArchaeo 2022
· TC4
· 2022
· 10.21014/tc4-ARC-2022.100
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Daniele Malfitana, Antonio Mazzaglia, Lara De Giorgi, Giovanni Leucci, Lucrezia Longhitano, Chiara Torre
The use of geophysical methods, have produced high-definition 3D models of one funerary monument in order to help the restoration work. Physical parameters such as seismic wave velocity propagation and electrical resistivity were optimal tools to store and manage scientific information about the degree of conservation of the studied monument. Conserve and preserve, also through the study and application of avant-garde technologies and methods in the field of restoration, means working not only for present generations, but also, and primarily, for future generations. New technologies and a...
TC4 MetroArchaeo 2022
· TC4
· 2022
· 10.21014/tc4-ARC-2022.099
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Giovanni Leucci, Lara De Giorgi, Ivan Ferrari, Francesco Giuri, Lucrezia Longhitano, Alberto Felici, Cristiano Riminesi
The Basilica of Santa Maria del Carmine in Florence, in the Oltrarno area, was built in 1268 (pre- Renaissance low medieval context), consecrated in 1422. Due to a devastating fire in 1771 of the interior of the original church, very little remained, between the parts that managed to save including the Corsini and Brancacci chapels. The architect Giuseppe Ruggeri was responsible for the reconstruction of the church, which was completed in 1782 (with the exception of the gabled façade which remained unfinished, as it can still be seen today (in fact it has bricks and exposed stone elements)....
TC4 MetroArchaeo 2022
· TC4
· 2022
· 10.21014/tc4-ARC-2022.098
· Download