Temat: ultraviolet laser - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Low atmospheric density measurement based on Rayleigh scattering of an ultraviolet laser
Autorzy:: Wang, R
Yao, J.
Zhong, K.
Miao, Y.
Cui, H.
Zhao, X.
Zhang, C.
Powiązania:: https://bibliotekanauki.pl/articles/174910.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: atmospheric density measurement
Rayleigh scattering
ultraviolet laser
Opis:: The qualitative measurement of low atmospheric density in the air flow field has been investigated in this paper. The supersonic flow field with Mach number of 1.5 around the NACA0006 aerofoil has been numerically simulated and the transient slight pressure and low density atmosphere have been experimentally determined based on Rayleigh scattering of a 266 nm ultraviolet laser. The scattering patterns have been effectively captured under different atmospheric pressure of 4.5, 92, 470 and 710 Pa with laser energy of only 0.5 mJ. It has been demonstrated that in the pressure range from 4.5 to 1100 Pa, corresponding to the atmospheric density from 4.8105×10–5 kg/m3 to 1.279×10–2 kg/m3, the scattering intensity of an ultraviolet laser is linear to the pressure and density with the slope coefficient of 0.00968 a.u./Pa and 0.83226 a.u./(kg/m3×10–3). It has been proved that Rayleigh scattering is a promising technology for observation of instantaneous and multidimensional distribution of a supersonic flow field.
Źródło:: Optica Applicata; 2013, 43, 3; 597-605
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Investigation of low-temperature plasmas formed in low-density gases surrounding laser-produced plasmas
Autorzy:: Majszyk, Mateusz
Bartnik, Andrzej
Skrzeczanowski, Wojciech
Fok, Tomasz
Węgrzyński, Łukasz
Szczurek, Mirosław
Fiedorowicz, Henryk
Powiązania:: https://bibliotekanauki.pl/articles/2202566.pdf
Data publikacji:: 2023
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: extreme ultraviolet
EUV
laser plasma
low pressure
photoionization
plasma
soft X-ray
SXR
Opis:: Low-temperature plasma production is possible as a result of photoionization using high-intensity extreme ultraviolet (EUV) and soft X-ray (SXR) pulses. Plasma of this type is also present in outer space, e.g., aurora borealis. It also occurs when high-velocity objects enter the atmosphere, during which period high temperatures can be produced locally by friction. Low-temperature plasma is also formed in an ambient gas surrounding the hot laser-produced plasma (LPP). In this work, a special system has been prepared for investigation of this type of plasma. The LPP was created inside a chamber fi lled with a gas under a low pressure, of the order of 1–50 mbar, by a laser pulse (3–9 J, 1–8 ns) focused onto a gas puff target. In such a case, the SXR/EUV radiation emitted from the LPP was partially absorbed in the low-density gas. In this case, high- and low-temperature plasmas (Te ~100 eV and ~1 eV, respectively) were created locally in the chamber. Investigation of the EUV-induced plasmas was performed mainly using spectral methods in ultraviolet/visible (UV/VIS) light. The measurements were performed using an echelle spectrometer, and additionally, spatial–temporal measurements were performed using an optical streak camera. Spectral analysis was supported by the PGOPHER numerical code.
Źródło:: Nukleonika; 2023, 68, 1; 11--17
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Evaluation of professional hazards related with optical radiation for ships hull welders at temporary work posts
Ocena zagrożenia spawaczy kadłubowych promieniowaniem optycznym na tymczasowych stanowiskach pracy
Autorzy:: Pawlak, A.
Powiązania:: https://bibliotekanauki.pl/articles/359590.pdf
Data publikacji:: 2010
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: nielaserowe promieniowanie optyczne
promieniowanie ultrafioletowe
widzialne i podczerwone
non-laser optical radiation
ultraviolet
visible and infrared radiation
Opis:: In this paper, we examine sources of optical radiation and the effects of interaction of specific types of optical radiation i.e. ultra-violet, visible and infra-red, on a human organism. Next, the current criteria for assessing optical radiation hazards and contemporary measurement methods for establishing the total and effective intensity of irradiation with ultra-violet radiation, as well as the intensity of irradiation with infra-red and visible radiation. In the following section, examples of temporary working posts for welders were presented, as used during maintenance works aboard ships. Measurement results for optical radiation at the selected working post were then quoted, accounting for three specific exposure times. The last section contains conclusions drawn from measurement results and interviews with a group of ship hull welders.
W referacie omówiono źródła promieniowania optycznego oraz skutki oddziaływania poszczególnych rodzajów promieniowania, tj. ultrafioletowego, widzialnego i podczerwonego na organizm człowieka. Przedstawiono aktualne kryteria oceny zagrożenia promieniowaniem optycznym oraz metody pomiarów całkowitego oraz skutecznego natężenia napromienienia promieniowaniem UV oraz natężenia napromienienia promieniowaniem podczerwonym i widzialnym. W dalszej części pokazano przykładowe, tymczasowe stanowiska pracy spawaczy podczas wykonywanych prac remontowych na pokładzie statku. Przytoczono wyniki pomiarów promieniowania optycznego na wybranym stanowisku pracy z uwzględnieniem trzech różnych czasów ekspozycji. Zamieszczono wnioski z wyników pomiarów oraz z rozmów z grupą spawaczy kadłubowych.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2010, 24 (96); 74-79
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Nanoparticles characterisation at the spark ignition engine exhaust
Autorzy:: Merola, S. S.
Tornatore, C.
Vaglieco, B. M.
Powiązania:: https://bibliotekanauki.pl/articles/243644.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: nanoparticles
Laser Induced Incandescence
Broadband Ultraviolet - Visible Extinction and Scattering Spectroscopy
Electrical Low Pressure Impactor
spark-ignition engine
Opis:: The particles at the exhaust of two Port Fuel Injection Spark Ignition (PFI-SI) engines were characterised in terms of number size distribution and chemical properties. Optical techniques based on the Laser Induced Incandescence (LII) and on the Broadband Ultraviolet - Visible Extinction and Scattering Spectroscopy (BUVESS) were applied. The optical results were compared with those obtained by Electrical Low Pressure Impactor (ELPI). The aim of the work was the characterisation of the nanoparticles emitted by Port Fuel Injection Spark Ignition (PFI - SI) engines in terms of number size distribution and chemical-physical properties. Two PFI - SI engines were used for the experiments: a four-cylinder engine and a research optically accessible single cylinder engine. The experiments were performed at the exhaust of a multi-cylinder SI engine equipped with a three way catalyst (TWC) and in the combustion chamber and at the exhaust of a single-cylinder optical engine. High number concentrations of nanoparticles (D less than 50 nm) were detected. The presence of carbonaceous particles at the exhausts was due to the ignition of the fuel film deposits on the intake valves and on the cylinder walls. This was demonstrated by the optical measurements performed in the combustion chamber of the research engine. Different engine operating conditions were considered.
Źródło:: Journal of KONES; 2008, 15, 3; 347-355
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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