Endre søk
Begrens søket
1 - 4 of 4
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Amer, Eynas
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Jönsson, Gustav
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Arrhén, Fredrik
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Towards traceable dynamic pressure calibration using a shock tube with an optical probe for accurate phase determination2022Inngår i: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 59, nr 3, artikkel-id 035001Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, we introduce a robust method for dynamic characterization of pressure measuring systems used in time-varying pressure applications. The dynamic response of the pressure measuring systems in terms of sensitivity and phase as a function of frequency at various amplitudes of the measurand can be provided. The shock tube which is the candidate primary standard for dynamic pressure calibration at the National Laboratory for pressure, Sweden, was used to realize the dynamic pressure. The shock tube setup used in this study can realize reference pressure with amplitudes up to 1.7 MPa in the frequency range from below a kilohertz up to a megahertz. The amplitude of the realized step pressure was calculated using the Rankine–Hugoniot step relations. In addition, the accurate time of arrival of the generated shock at the device under test (DUT) was measured using an optical probe based on shadowgraphy. The optical detector has a response time in nanosecond time scale which is several orders of magnitude faster than the response time of any pressure measuring system. Hereby, the latency between physical stimuli and response of the DUT can be measured. By the knowledge of the amplitude and the accurate time of arrival of the reference step pressure, the transfer function of the DUT can be calculated and presented in Bode diagrams of sensitivity and phase response versus frequency. The uncertainty in sensitivity and phase measurements was estimated. The information provided by this work is useful for developing reliable models of dynamic pressure measuring system and provide accurate information about their dynamic response. That in turn will contribute to establish a traceability chain for dynamic pressure calibration.

  • 2.
    Amer, Eynas
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Wozniak, Mikolaj
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Jönsson, Gustav
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Arrhén, Fredrik
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Evaluation of Shock Tube Retrofitted with Fast-Opening Valve for Dynamic Pressure Calibration2021Inngår i: Sensors, E-ISSN 1424-8220, Vol. 21, nr 13, artikkel-id 4470Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Accurate dynamic pressure measurements are increasingly important. While traceability is lacking, several National Metrology Institutes (NMIs) and calibration laboratories are currently establishing calibration capacities. Shock tubes generating pressure steps with rise times below 1 µs are highly suitable as standards for dynamic pressures in gas. In this work, we present the results from applying a fast-opening valve (FOV) to a shock tube designed for dynamic pressure measurements. We compare the performance of the shock tube when operated with conventional single and double diaphragms and when operated using an FOV. Different aspects are addressed: shock-wave formation, repeatability in amplitude of the realized pressure steps, the assessment of the required driver pressure for realizing nominal pressure steps, and economy. The results show that using the FOV has many advantages compared to the diaphragm: better repeatability, eight times faster to operate, and enables automation of the test sequences.

  • 3.
    Forssén, Clayton
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik. Umeå University, Sweden.
    Silander, Isak
    Umeå University, Sweden.
    Zakrisson, Johan
    Umeå University, Sweden.
    Amer, Eynas
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Szabo, David
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Bock, Thomas
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Kussike, Andre
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Rubin, Tom
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Mari, Domenico
    INRiM Istituto Nazionale di Ricerca Metrologica, Italy.
    Pasqualin, Stefano
    INRiM Istituto Nazionale di Ricerca Metrologica, Italy.
    Silvestri, Zaccaria
    Conservatoire National des Arts et Métiers Laboratoire Commun de Métrologie, France.
    Bentouati, Djilali
    LNE Laboratoire National de Métrologie et d’Essais, France.
    Axner, Ove
    Umeå University, Sweden.
    Zelan, Martin
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Demonstration of a Transportable Fabry–Pérot Refractometer by a Ring-Type Comparison of Dead-Weight Pressure Balances at Four European National Metrology Institutes2023Inngår i: Sensors, E-ISSN 1424-8220, Vol. 24, nr 1, artikkel-id 7Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Fabry–Pérot-based refractometry has demonstrated the ability to assess gas pressure with high accuracy and has been prophesized to be able to realize the SI unit for pressure, the pascal, based on quantum calculations of the molar polarizabilities of gases. So far, the technology has mostly been limited to well-controlled laboratories. However, recently, an easy-to-use transportable refractometer has been constructed. Although its performance has previously been assessed under well-controlled laboratory conditions, to assess its ability to serve as an actually transportable system, a ring-type comparison addressing various well-characterized pressure balances in the 10–90 kPa range at several European national metrology institutes is presented in this work. It was found that the transportable refractometer is capable of being transported and swiftly set up to be operational with retained performance in a variety of environments. The system could also verify that the pressure balances used within the ring-type comparison agree with each other. These results constitute an important step toward broadening the application areas of FP-based refractometry technology and bringing it within reach of various types of stakeholders, not least within industry.

  • 4.
    Svete, A.
    et al.
    University of Ljubljana, Slovenia.
    Amer, Eynas
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Jönsson, Gustav
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Kutin, J.
    University of Ljubljana, Slovenia.
    Arrhén, Fredrik
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    A method for correcting the high-frequency mechanical vibration effects in the dynamic calibration of pressure measurement systems using a shock tube2023Inngår i: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216, Vol. 193, artikkel-id 110246Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The extremely rapid reflection of a shock wave from the end wall generated in the shock tube, in addition to the high-frequency content of pressure, inevitably also excites mechanical vibrations. These can potentially produce acceleration-induced spurious signals as part of the dynamic output of the pressure measurement system being calibrated. This paper proposes and evaluates a method for correcting the frequency response of a pressure measurement system obtained with a calibration using a shock tube for the acceleration-induced errors due to vibrations. The proposed method is based on the predetermined frequency response of the pressure measurement system to the accelerations and simultaneous measurements of the vibration accelerations of the pressure sensor during its calibration in the shock tube. The acceleration-induced errors were corrected for a piezoelectric pressure measurement system calibrated in a diaphragmless shock tube developed at the National laboratory for pressure and vacuum at RISE Research Institutes of Sweden, where different vibrational conditions were induced by changing the initial driver pressure, while keeping the initial driven pressure constant. The uncertainty of the correction of the frequency response of the piezoelectric pressure measurement system being calibrated was determined by considering the uncertainty contributions of the measured acceleration frequency response of the pressure measurement system, the measured acceleration of the pressure sensor during its calibration in the shock tube, the generated reference end-wall step pressure and the repeatability of the correction. The results show that the proposed method effectively eliminates acceleration-induced errors in the sensitivity and phase frequency responses of an acceleration-sensitive piezoelectric pressure measurement system being calibrated with a shock tube.

1 - 4 of 4
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
v. 2.43.0