Laser radiation induced thermal effects on the interactions between the tangential airflow and aluminum alloy

2017 ◽  
Author(s):  
Shengying Lai ◽  
Bing Han ◽  
Xiaowu Ni ◽  
Zhonghua Shen ◽  
Jian Lu
Keyword(s):  
Aluminum Alloy ◽  
Laser Radiation ◽  
Thermal Effects ◽  
Radiation Induced

Investigation of thermal effects caused by interaction of laser radiation with soft tissues

2012 ◽  
Author(s):  
Mariusz Kastek ◽  
Tadeusz Piatkowski ◽  
Henryk Polakowski ◽  
Andrzej Zajac
Keyword(s):  
Laser Radiation ◽  
Thermal Effects ◽  
Soft Tissues

The Observations of Paramagnetic Centers in Tellurite Glasses

1994 ◽  
Vol 373 ◽  
Author(s):  
J.D. Prohaska ◽  
J. Li ◽  
S. Kannan ◽  
E. Snitzer ◽  
J.S. Wang ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Room Temperature ◽  
The Other ◽  
Tellurite Glasses ◽  
Hole Center ◽  
Paramagnetic Centers ◽  
First Report ◽  
Esr Spectrum ◽  
Radiation Induced

AbstractThis is the first report of ESR observations of three distinct paramagnetic centers in TeO29 glasses. One center is intrinsic to the glass and the other two are induced by KrFexcimer-laser radiation. The intrinsic center with a broad ESR spectrum is tentatively identified as an oxygen-associated hole center. One radiation-induced center fades slowly at room temperature; its proposed structure is that of an electron trapped in a diffuse orbital associated with a modifier ion. The other radiation-induced center is stable at room temperature and corresponds to the Vo· center observed in crystalline paratellurite.

scholarly journals Theoretical bases of calculation of energy parameters of laser radiation for thermotherapy of Baker's cyst.

2017 ◽  
Vol 10 (4) ◽  
pp. 304-309
Author(s):  
Andrew V Zhilyakov ◽  
S A Chernyadiev ◽  
A V Aretinskiy ◽  
N I Sivkova ◽  
N Yu Korobova ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Laser Radiation ◽  
Thermal Effects ◽  
Negative Impact ◽  
Heat Removal ◽  
Thermal Exposure ◽  
Thermal Imager ◽  
Radiation Emission ◽  
Lidocaine Solution ◽  
Series Of Experiments

Actuality: Interstitial application of light energy to pathological tissues of small volume always raises concerns about the possible negative impact of excessive thermal effects on the surrounding unchanged structures. At the same time, insufficient thermal exposure does not allow achieving the desired result of manipulation. In particular, with a similar problem, there are surgeons performing laser-induced thermotherapy of cysts of different localization. Objective: Determine the time to reach the desired temperature required for the irreversible coagulation of the wall of the Baker cyst, depending on the power of the laser radiation and the volume of the intracystic fluid. Materials and methods: Several series of experiments were carried out in which different volumes of aqueous lidocaine solution were heated in disposable syringes by laser radiation fed along a flexible light-bearing fiber. Registration of infrared radiation from this system was performed by a portable thermal imager CONDTROL IR-CAM (Russia). The time for heating the syringe to 70 ° C was measured at different radiation powers. Results: In all series of experiments, a predetermined temperature of 70 ° C was achieved, providing instantaneous protein coagulation. Attention is drawn to the fact that the calculated time by the formula (ideal) in all cases is less, which can be explained by the effect of heat removal from the walls of syringes. The higher the power of laser radiation, the less the effect of heat removal on the heating rate of the aqueous solution, and, accordingly, the time to reach the set temperature. Conclusion. In the energy regimes and volumes of the aqueous solution studied, the optical fiber with end radiation emission is not capable of causing carbonization and damage to surrounding tissues. Accordingly, contactless perforation of the cyst wall by laser radiation with a wavelength of 1.47 μm is impossible. The obtained data testify to the advisability of calculating the energy to reach the set temperature and keeping it for a period sufficient for coagulation transformation of the more external layers of education

scholarly journals Нелинейный фотоакустический отклик на механические напряжения вблизи отверстия в пластине из алюминиевого сплава Д16

2020 ◽  
Vol 46 (4) ◽  
pp. 22
Author(s):  
А.Л. Глазов ◽  
Н.Ф. Морозов ◽  
К.Л. Муратиков
Keyword(s):  
Aluminum Alloy ◽  
Laser Radiation ◽  
Thermal Effect ◽  
Modulation Frequency ◽  
Photoacoustic Signal ◽  
Theoretical Description ◽  
Mechanical Stresses ◽  
Electronic Subsystem ◽  
Sound Generation ◽  
Photoacoustic Effect

The features of the behavior of the photoacoustic signal depending on mechanical stresses near the hole in the plate made of aluminum alloy D16 are investigated. A new nonlinear photoacoustic effect was discovered, which consists in the appearance of a nonlinear component of the photoacoustic signal depending on mechanical stresses near the hole. This dependence is recorded in the signal at the modulation frequency of the laser radiation. A theoretical description of the discovered effect of sound generation by the thermoelastic mechanism in stressed metals is proposed basing on the consideration of the thermal effect of laser radiation on their electronic subsystem.

scholarly journals Radiation-induced molecular hydrogen gas generation in the presence of aluminum alloy 1100

2020 ◽  
Vol 177 ◽  
pp. 109117
Author(s):  
Elizabeth H. Parker-Quaife ◽  
Christopher Verst ◽  
Colt R. Heathman ◽  
Peter R. Zalupski ◽  
Gregory P. Horne
Keyword(s):  
Aluminum Alloy ◽  
Molecular Hydrogen ◽  
Hydrogen Gas ◽  
Gas Generation ◽  
Radiation Induced

Computer monitoring of the thermal effects induced by Er:YAG laser radiation during preparation of the hard tooth tissue

1993 ◽  
Author(s):  
Tatjana Dostalova ◽  
Otakar Krejsa ◽  
Helena Jelinkova ◽  
Karel Hamal ◽  
Ivan Prochazka ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Thermal Effects ◽  
Er:Yag Laser ◽  
Computer Monitoring ◽  
Tooth Tissue
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